阅读说明：本技术 一种炒蔓荆子标准汤剂质量检测方法 (Quality detection method for fried fructus viticis standard decoction ) 是由 何述金 周代俊 周雪生 朱美成 周乐学 喻艳 何承东 于 2021-09-13 设计创作，主要内容包括：本发明提供一种炒蔓荆子标准汤剂质量检测方法,包括通过对炒蔓荆子标准汤剂的性状、干浸膏出膏率、薄层鉴别、浸出物、特征图谱及蔓荆子黄素含量测定,将炒蔓荆子标准汤剂含量标准限定为每1g含蔓荆子黄素为0.70-2.25mg,其中,干浸膏出膏率测定采用煎煮法进行测定；薄层鉴别采用照薄层色谱法进行鉴别；浸出物采用热浸法测定；特征图谱及蔓荆子黄素含量测定均采用液相色谱法测定。本发明的炒蔓荆子标准汤剂质量检测方法,通过多方面测量,来评定炒蔓荆子标准汤剂的质量,为产品的质量稳定奠定坚实的基础,能够建立炒蔓荆子汤剂可行的质量标准,实现炒蔓荆子标准汤剂质量的有效控制。(The invention provides a quality detection method of a fried fructus viticis standard decoction, which comprises the steps of limiting the content standard of the fried fructus viticis standard decoction to 0.70-2.25mg of vitexin in every 1g by properties of the fried fructus viticis standard decoction, dry extract yield, thin layer identification, extract, characteristic spectrum and vitexin content measurement, wherein the dry extract yield measurement adopts a decocting method for measurement; thin-layer identification is carried out by adopting thin-layer chromatography; measuring the extract by adopting a hot dipping method; the characteristic spectrum and the vitexin content are measured by liquid chromatography. According to the quality detection method for the fried fructus viticis standard decoction, the quality of the fried fructus viticis standard decoction is evaluated through multi-aspect measurement, a solid foundation is laid for the stable quality of products, a feasible quality standard of the fried fructus viticis decoction can be established, and the effective control of the quality of the fried fructus viticis standard decoction is realized.)

1. A quality detection method of a fried fructus viticis standard decoction is characterized by comprising the following detection methods,

the method comprises the steps of limiting the standard decoction content to 0.70-2.25mg of vitexin in each 1g of fructus viticis by properties of a parched fructus viticis standard decoction, dry extract yield, TLC identification, extract, characteristic spectrum and vitexin content measurement, wherein the dry extract yield measurement adopts a decocting method; thin-layer identification is carried out by adopting thin-layer chromatography; measuring the extract by adopting a hot dipping method; measuring the characteristic spectrum and the vitexin content by adopting a liquid chromatography;

the characteristic spectrum determination by liquid chromatography comprises the following steps: performing liquid chromatograph analysis, taking a solution prepared from a comparison medicinal material of parched fructus Vitics Simplicifoliae as a reference solution b, taking a solution prepared from a reference product of vitexin as a reference solution b, taking a solution prepared from a standard decoction sample of parched fructus Vitics Simplicifoliae as a test solution b, precisely sucking the reference solution b, the reference solution b and the test solution b respectively, injecting into a liquid chromatograph, and measuring to obtain the final product; wherein, the adopted chromatographic conditions are that a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: gradient elution was performed as specified in table a using methanol as mobile phase a and 0.1% phosphoric acid solution as mobile phase B;

TABLE a gradient elution procedure

Flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

2. The quality detection method for the fried fructus viticis standard decoction as claimed in claim 1, wherein the decocting method comprises the following steps: soaking parched fructus Vitics Simplicifoliae decoction pieces in water for 30-40min, decocting twice, the first time for 30-40min and the second time for 25-30min, performing solid-liquid separation while hot, mixing filtrates, concentrating, and drying to obtain parched fructus Vitics Simplicifoliae standard decoction dry extract powder.

3. The quality detection method for the fried vitex rotundifolia standard decoction as claimed in claim 1, wherein the thin-layer chromatography comprises the following steps:

(1) preparing a test solution a: taking 5g of a fried fructus viticis standard decoction sample, adding 50mL of petroleum ether, heating and refluxing for 2 hours, filtering, volatilizing the residue, adding 80mL of acetone, heating and refluxing for 1.5 hours, filtering, evaporating the filtrate to dryness, and dissolving the residue with 2mL of methanol to prepare a sample solution a;

(2) preparation of control solution a: dissolving vitexin reference substance in methanol to obtain reference substance solution a with concentration of 1 mg/mL;

(3) performing thin layer chromatography analysis: the thin layer chromatography conditions were thin layer plates: silica gel G thin layer plate prepared by 1% sodium hydroxide solution; sample amount of spotting: 5uL of each of the test solution a and the reference solution a; developing agent: cyclohexane-ethyl acetate-methanol solution in a volume ratio of 3:2: 0.2; color developing agent: 10% sulfuric acid ethanol solution, and inspecting under light.

4. The quality detection method for the fried fructus viticis standard decoction according to claim 3, wherein in the thin layer chromatography, the boiling range specification of the petroleum ether is 60-90 ℃.

5. The method for detecting quality of fructus viticis preparata standard decoction according to claim 1, wherein the hot dipping method uses ethanol as a solvent, and adopts the hot dipping method under the alcohol-soluble extract measuring item to measure the extract range.

6. The quality detection method for the fried fructus viticis standard decoction according to claim 1, wherein the determination of the characteristic spectrum by the liquid chromatography further comprises the following steps:

(1) preparation of reference solution b: taking 0.5g of fried fructus viticis control medicinal material, adding 25mL of water, decocting for 1 hour, filtering, evaporating filtrate to dryness, adding 5mL of methanol into residue, filtering, and taking filtrate as reference substance solution b;

(2) preparation of control solution b: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol for dissolving to obtain a reference substance solution b with the concentration of 20 ug/mL;

(3) preparing a test solution b: taking 0.1g of fried fructus viticis standard decoction sample, precisely weighing, placing in a conical flask with a plug, adding 25mL of precisely weighed methanol, sealing the plug, weighing, ultrasonically treating for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, filtering, and taking the filtrate as a test sample solution b.

7. The quality detection method for the fried vitex rotundifolia standard decoction as claimed in claim 1, wherein the determination of vitexin content by liquid chromatography comprises the following steps: performing liquid chromatograph analysis, taking the solution prepared from vitexin reference substance as reference substance solution c, taking the solution prepared from parched fructus Vitics standard decoction sample as test substance solution c, precisely sucking the reference substance solution c and the test substance solution c respectively, injecting into liquid chromatograph, and measuring; wherein, the adopted chromatographic conditions are that a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: taking methanol as a mobile phase A and 0.1% phosphoric acid solution as a mobile phase B, and performing gradient elution according to the specification; flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

8. The method for detecting the quality of the fried vitex rotundifolia standard decoction as claimed in claim 7, wherein the step of measuring the vitexin content by liquid chromatography further comprises the following steps:

(1) preparation of control solutions: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol to prepare a solution containing vitexin with the concentration of 5ug/ml as a reference substance solution c;

(2) preparing a test solution: taking a fried fructus viticis standard decoction sample of about 0.1g, precisely weighing, placing in a conical flask with a plug, precisely adding 25mL of methanol, sealing the plug, weighing, performing ultrasonic treatment for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, and filtering to obtain a test solution c.

Technical Field

The invention relates to the technical field of quality control of traditional Chinese medicinal materials, and in particular relates to a quality detection method of a fried fructus viticis standard decoction.

Background

Modern medicines need to have three characteristics of stability, uniformity, safety and effectiveness, and Chinese patent medicines are difficult to be compared with western medicines in the aspects, so that various means are needed for detection, and the reliability and stability of detection results are ensured. Fructus Vitics Simplicifoliae is dry mature fruit of Simpleleaf or Simpleleaf Shrub Chastetree of Verbenaceae, mainly produced in Shandong, Jiangxi, Zhejiang and Fujian provinces, pungent and bitter in flavor, slightly cold in nature, entering stomach, bladder and liver channel, and has the main effects of dispelling wind heat, clearing head and eyes, and eliminating dampness in joints, and is commonly used for external headache, migraine, dizziness, dim eyesight, hyperdacryosis, pain in eyes, swelling and pain of gum, and spasm of damp arthralgia. At present, the detection method of the fried fructus viticis is mainly based on the thin-layer chromatography, but the detection method of the fried fructus viticis decoction only adopts the existing thin-layer chromatography to detect the defects, and the quality control requirements of the traditional Chinese medicine formula granules cannot be met. Therefore, it is necessary to establish a quality detection method of the fried fructus viticis standard decoction for controlling the quality N of the medicinal materials.

Disclosure of Invention

The invention aims to solve the defects of the prior art and provide a method for detecting the quality of a fried fructus viticis standard decoction so as to better control the quality of the fried fructus viticis decoction, characterize the medicine quality and improve the medicine stability.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a quality detection method of a fried fructus viticis standard decoction, which comprises the following detection methods,

the method comprises the steps of limiting the standard decoction content to 0.70-2.25mg of vitexin in each 1g of fructus viticis by properties of a parched fructus viticis standard decoction, dry extract yield, TLC identification, extract, characteristic spectrum and vitexin content measurement, wherein the dry extract yield measurement adopts a decocting method; thin-layer identification is carried out by adopting thin-layer chromatography; measuring the extract by adopting a hot dipping method; measuring the characteristic spectrum and the vitexin content by adopting a liquid chromatography;

the characteristic spectrum determination by liquid chromatography comprises the following steps: performing liquid chromatograph analysis, taking a solution prepared from a comparison medicinal material of parched fructus Vitics Simplicifoliae as a reference solution b, taking a solution prepared from a reference product of vitexin as a reference solution b, taking a solution prepared from a standard decoction sample of parched fructus Vitics Simplicifoliae as a test solution b, precisely sucking the reference solution b, the reference solution b and the test solution b respectively, injecting into a liquid chromatograph, and measuring to obtain the final product; wherein, the adopted chromatographic conditions are that a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: gradient elution was performed as specified in table a using methanol as mobile phase a and 0.1% phosphoric acid solution as mobile phase B;

TABLE a gradient elution procedure

Flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

In one embodiment, the cooking method comprises: soaking parched fructus Vitics Simplicifoliae decoction pieces in water for 30-40min, decocting twice, the first time for 30-40min and the second time for 25-30min, performing solid-liquid separation while hot, mixing filtrates, concentrating, and drying to obtain parched fructus Vitics Simplicifoliae standard decoction dry extract powder.

In one embodiment, the thin layer chromatography comprises the following steps:

(1) preparing a test solution a: taking 5g of a fried fructus viticis standard decoction sample, adding 50mL of petroleum ether, heating and refluxing for 2 hours, filtering, volatilizing the residue, adding 80mL of acetone, heating and refluxing for 1.5 hours, filtering, evaporating the filtrate to dryness, and dissolving the residue with 2mL of methanol to prepare a sample solution a;

(2) preparation of control solution a: dissolving vitexin reference substance in methanol to obtain reference substance solution a with concentration of 1 mg/mL;

(3) performing thin layer chromatography analysis: the thin layer chromatography conditions were thin layer plates: silica gel G thin layer plate prepared by 1% sodium hydroxide solution; sample amount of spotting: 5uL of each of the test solution a and the reference solution a; developing agent: cyclohexane-ethyl acetate-methanol solution in a volume ratio of 3:2: 0.2; color developing agent: 10% sulfuric acid ethanol solution, and inspecting under light.

In one embodiment, the boiling range specification of the petroleum ether in the thin layer chromatography is 60-90 ℃.

In one embodiment, the hot dipping method uses ethanol as a solvent, and adopts the hot dipping method under the item of alcohol-soluble extract measuring method to measure the extract range.

In one embodiment, the step of determining the characteristic profile by liquid chromatography further comprises the following steps:

(1) preparation of reference solution b: taking 0.5g of fried fructus viticis control medicinal material, adding 25mL of water, decocting for 1 hour, filtering, evaporating filtrate to dryness, adding 5mL of methanol into residue, filtering, and taking filtrate as reference substance solution b;

(2) preparation of control solution b: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol for dissolving to obtain a reference substance solution b with the concentration of 20 ug/mL;

(3) preparing a test solution b: taking 0.1g of fried fructus viticis standard decoction sample, precisely weighing, placing in a conical flask with a plug, adding 25mL of precisely weighed methanol, sealing the plug, weighing, ultrasonically treating for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, filtering, and taking the filtrate as a test sample solution b.

In one embodiment, the liquid chromatography method for determining the vitexin content comprises the following steps: performing liquid chromatograph analysis, taking the solution prepared from vitexin reference substance as reference substance solution c, taking the solution prepared from parched fructus Vitics standard decoction sample as test substance solution c, precisely sucking the reference substance solution c and the test substance solution c respectively, injecting into liquid chromatograph, and measuring; wherein, the adopted chromatographic conditions are that a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: taking methanol as a mobile phase A and 0.1% phosphoric acid solution as a mobile phase B, and performing gradient elution according to the specification; flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

In one embodiment, the liquid chromatography method for determining the vitexin content further comprises the following steps:

(1) preparation of control solutions: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol to prepare a solution containing vitexin with the concentration of 5ug/ml as a reference substance solution c;

(2) preparing a test solution: taking a fried fructus viticis standard decoction sample of about 0.1g, precisely weighing, placing in a conical flask with a plug, precisely adding 25mL of methanol, sealing the plug, weighing, performing ultrasonic treatment for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, and filtering to obtain a test solution c.

Compared with the prior art, the invention has the beneficial effects that:

(1) through researching the properties of the fried fructus viticis standard decoction, the dry extract yield, the thin-layer identification, the extract, the characteristic spectrum and the vitexin content measurement, the quality of the fried fructus viticis standard decoction is evaluated through multi-aspect measurement, a solid foundation is laid for the quality stability of products, a feasible quality standard of the fried fructus viticis decoction can be established, the effective control of the quality of the fried fructus viticis standard decoction is realized, and in addition, the chromatographic condition of the application is adopted for liquid phase analysis, so that a chromatogram with better and clearer separation degree can be obtained.

(2) The fried fructus viticis decoction pieces are prepared into fried fructus viticis decoction piece standard decoction according to a decoction method, the average content of vitexin is 1.31mg/g, the detected content range is 0.85-1.77 mg/g, SD (standard deviation) is 0.317, the allowable range of vitexin content is 0.917-1.703mg/g calculated according to 70-130% of the average value, the allowable range of vitexin content is 0.676-2.261 mg/g calculated according to low limit (-2 SD) and high limit (-3 SD), so the content range of vitexin of the standard decoction is drawn as follows: 0.70 mg/g-2.25 mg/g; the average transfer rate of the vitexin is 24.47%, the transfer rate range is 16.66-38.80%, the SD is 6.66, according to technical requirements for quality control and standard formulation of Chinese medicinal granules, the allowable range of the vitexin content transfer rate is 17.13-31.81% calculated according to 70-130% of the transfer rate average value, and is 4.49-44.45% calculated according to +/-3 SD, so that the vitexin content transfer rate range of the standard decoction is determined as follows: 5.0-44.5%, and the result shows that the vitexin content and the transfer rate thereof in the standard decoction of a plurality of batches are within the allowable range, so the invention can provide reference basis for the quality standard research of the stir-fried vitex rotundifolia formula particles.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a TLC (thin layer chromatogram) of 15 batches of standard decoction of parched fructus Vitics Simplicifoliae (fructus Vitics Simplicifoliae) decoction pieces in one embodiment of the present invention; wherein 10 groups of maps are negative control sample thin-layer maps, 8 and 9 groups of vitexin control solution thin-layer maps, and 1 to 7 and 11 to 18 groups of fried vitex rotundifolia (fructus viticis) decoction pieces 15 batches of standard decoction thin-layer maps.

FIG. 2 is a comparison of different extraction methods in the investigation of the extraction method of the present invention; wherein, S1 ultrasonic extraction test sample solution feature map; s2 is the characteristic spectrum of the test solution extracted by reflux.

FIG. 3 is a comparison graph of different extraction times in the investigation of the extraction time according to the present invention; wherein S1 is a characteristic spectrum of the sample solution extracted by ultrasound for 20 min; s2 is a characteristic spectrum of the sample solution extracted by ultrasonic for 30 min; s3 is a sample solution characteristic spectrum extracted by ultrasonic for 40 min.

FIG. 4 is a comparison of different extraction solvents in the present invention; wherein S1 is a characteristic map of a test solution prepared by 20% methanol extraction; s2 is a characteristic spectrum of a test solution prepared by 50% ethanol extraction; s3 is a sample solution feature map prepared by methanol extraction.

FIG. 5 is a graph comparing different sample amounts in the sample amount taking examination according to the present invention; wherein S1 is a characteristic diagram of the sample solution with the sample taking amount of 0.05 g; s2 is a characteristic diagram of the sample solution with the sample dosage of 0.1 g; s3 is a characteristic diagram of the test solution with the sample taking amount of 0.15 g.

FIG. 6 is a comparison of blank solvents for the specificity test of the present invention; wherein S1 is a blank solvent (methanol) characteristic map; s2 is a characteristic map of the reference solution; s3 is the characteristic map of the test solution.

FIG. 7 is a common peak superposition signature for the repeatability tests of the present invention; wherein S1 is a common peak superposition characteristic spectrum of the test solution under the repeatability 1; s2 is a common peak superposition characteristic spectrum of the test solution under the repeatability 2; s3 is a common peak superposition characteristic spectrum of the test solution under repeatability 3; s4 is a common peak superposition characteristic spectrum of the test solution under repeatability 4; s5 is a common peak superposition characteristic spectrum of the test solution under the repeatability 5; s6 is a common peak superposition characteristic spectrum of the test solution under the repeatability 6; s7 is a control map.

FIG. 8 is a precision test common peak overlap profile of the present invention; wherein, S1 is a common peak superposition characteristic spectrum of the test solution under the precision 1; s2 is a common peak superposition characteristic spectrum of the test solution under precision 2; s3 is a common peak superposition characteristic spectrum of the test solution under precision 3; s4 is a common peak superposition characteristic spectrum of the test solution under the precision of 4; s5 is a common peak superposition characteristic spectrum of the test solution under the precision of 5; s6 is the common peak superposition characteristic spectrum of the sample solution under the precision of 6.

FIG. 9 is a common peak superposition signature for the stability test of the present invention; wherein S1 is a common peak superposition characteristic map of the test sample solution measured in 0 h; s2 is a common peak superposition characteristic map of the test sample solution measured in 2 h; s3 is a common peak superposition characteristic map of the test sample solution measured in 4 h; s4 is a common peak superposition characteristic map of the test sample solution measured in 8 h; s5 is a common peak superposition characteristic map of the test sample solution measured in 12 h; and S6 is the common peak superposition characteristic spectrum of the test solution measured in 24 h.

FIG. 10 is a chart of vitexin control in standard decoction profile determination of the present invention.

FIG. 11 is a comparison graph of Vitex rotundifolia fruit in standard decoction profile determination of the invention.

FIG. 12 is a superposition spectrum of 15 batches of fried fructus Vitics Simplicifoliae Chinese medicinal materials in standard decoction characteristic spectrum measurement of the invention; wherein, S1-S15 respectively represent the superposition spectrum of 1-15 batches of fried fructus viticis traditional Chinese medicinal materials.

FIG. 13 is a superimposed spectrum of a 15-batch parched fructus Vitics Simplicifoliae standard decoction in the standard decoction feature spectrum measurement of the present invention; wherein, S1-S15 show the superposition pattern of the 15 batches of stir-fried fructus viticis standard decoction from T210701-T210715.

FIG. 14 is a graph of a standard decoction of 15 batches of parched fructus Vitics Simplicifoliae in the standard decoction profile determination of the present invention.

FIG. 15 is a linear plot of the different concentrations of a vitexin control in a linear range assay of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.

The invention provides a quality detection method of a fried vitex rotundifolia (vitex rotundifolia) standard decoction, which comprises the following detection method, wherein the standard decoction content is limited to 0.70-2.25mg of vitex rotundifolia flavin in each 1g by properties of the fried vitex rotundifolia (vitex rotundifolia) standard decoction, dry extract yield, thin-layer identification, extract, characteristic spectrum and vitex rotundifolia flavin content measurement, wherein the dry extract yield measurement adopts a decoction method for measurement; thin-layer identification is carried out by adopting thin-layer chromatography; measuring the extract by adopting a hot dipping method; the characteristic spectrum and the vitexin content are measured by liquid chromatography.

In this embodiment:

preparing a fried fructus viticis (fructus viticis) standard decoction: referring to a decocting method in the management Specification of Chinese medicine decoction rooms of medical institutions (No. 2009) of State administration of traditional Chinese medicine), 15 batches of fried fructus Viticis (fructus Vitics Simplicifoliae) decoction pieces are taken, added with water until the decoction pieces are about 4-5cm, soaked for 30-40min, decocted twice, the first decocting time is 30-40min, the second decocting time is 25-30min, solid-liquid separation is carried out while hot, filtrates are combined, concentrated and dried, and the 15 batches of fried fructus Vitics Simplicifoliae (fructus Vitics Simplicifoliae) standard dry paste decoction powder is prepared.

1. Trait survey

According to the physical characteristics of 15 batches of fried fructus viticis (fructus viticis) standard decoction, the powder is described as brown to tan powder, and the powder has specific and aromatic smell, light taste and slight acridness.

2. Dry extract yield test

Taking the 15 batches of fried dry extract powder of the standard decoction of the vitex rotundifolia (vitex rotundifolia), calculating the yield of the dry extract (see table 1) by using the dry extract powder, calculating the average yield to be 8.49%, calculating the allowable range of the paste yield (the average value is 70-130%) according to the standard decoction, and setting the paste yield of the product to be 6-11% because the allowable range of the paste yield is 5.94-11.04%.

Table 1: rate of paste discharge

The results show that the yield of 15 batches of standard decoction dry extract is 7.78-9.22%, and the ranges of the standard decoction dry extract and the standard decoction dry extract meet the proposed limit range of 6-11%.

3. Thin layer authentication

The product is a dry extract of single-flavor decoction piece fried fructus viticis (fructus viticis), a method under the item of 'thin-layer identification' of semen lepidii in Chinese pharmacopoeia is referred, a vitexin reference substance is used as a reference, a color developing agent is adjusted, the thin-layer identification method of the product is established, after 15 batches of sample tests, the spots of the test product are basically clear, and a negative reference sample is free of interference, so the product is prepared as the identification item of the product. The test methods and results are as follows:

the test method comprises the following steps: performing thin layer chromatography (China pharmacopoeia 2020 edition four-part general rule 0502)

Preparing a test solution: taking 5g of the product, adding 50mL of petroleum ether (with the boiling range specification of 60-90 ℃), heating and refluxing for 2 hours, filtering, discarding petroleum ether solution, volatilizing the residue, adding 80mL of acetone, heating and refluxing for 1.5 hours, filtering, evaporating the filtrate to dryness, and dissolving the residue with 2mL of methanol to obtain a sample solution.

Preparation of a reference solution: dissolving vitexin control in methanol to obtain control solution with concentration of 1 mg/mL.

Thin-layer chromatography conditions: thin-layer plate: silica gel G thin layer plate prepared by 1% sodium hydroxide solution; sample amount of spotting: the test solution and the reference solution are both 5 uL; developing agent: cyclohexane-ethyl acetate-methanol solution in a volume ratio of 3:2: 0.2; color developing agent: spraying 10% sulfuric acid ethanol solution, and inspecting under light.

As a result: spots of the same color appear in the chromatogram of the test solution at the positions corresponding to those in the chromatogram of the control solution, as shown in detail in FIG. 1.

4. Measurement of extract

Taking 15 batches of standard decoction, taking ethanol as solvent, and performing hot-dipping assay under alcohol-soluble extract assay (2201 in 2020 th edition of Chinese pharmacopoeia), and the results are shown in Table 2.

Table 2: measurement results of extract

The results show that the mean value of 15 batches of standard decoction extracts is 24.88 percent, the alcohol-soluble extract of the product is determined to be not less than 18.0 percent by referring to the lower limit of the allowable range of the standard limit (the mean value is 70-130 percent), and the measurement results of 15 batches of standard decoction extracts meet the requirement of the set limit.

5. Feature map testing

5.1 liquid chromatography

Chromatographic conditions are as follows: a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: gradient elution was performed as specified in table 3 using methanol as mobile phase a and 0.1% phosphoric acid solution as mobile phase B; flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

Table 3:

(1) preparation of reference solutions: taking 0.5g of parched fructus Vitics Simplicifoliae (fructus Vitics Simplicifoliae) as reference material, adding 25mL of water, decocting for 1 hr, filtering, evaporating filtrate to dryness, adding 5mL of methanol, filtering, and taking filtrate as reference solution;

(2) preparation of control solutions: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol for dissolving to obtain a reference substance solution with the concentration of 20 ug/mL;

(3) preparing a test solution: taking 0.1g of fried fructus viticis (fructus viticis) standard decoction sample, precisely weighing, placing in a conical flask with a plug, adding 25mL of precisely weighed methanol, sealing, weighing, ultrasonically treating for 30min, cooling, weighing again, supplementing with methanol to reduce weight loss, shaking, filtering, and taking filtrate as sample solution.

The determination method comprises the following steps: precisely sucking 10 μ L of reference solution, reference solution and sample solution respectively, injecting into liquid chromatograph, and measuring.

5.2 methodological considerations

Investigation of extraction method: the test solutions were prepared by different extraction methods, including ultrasonic 30min extraction, reflux 30min extraction, and measured according to the 5.1 test method described above. The results show that as shown in fig. 2, the number of the main peaks of 30min ultrasonic treatment and 30min reflux treatment is consistent, the total peak area of the main peaks has no obvious difference, the RSD is 0.65% (see table 4 in detail), the ultrasonic extraction mode is more convenient, and the sample extraction mode is selected as ultrasonic treatment for 30 minutes.

Table 4:

examination of extraction time: the test solutions were prepared at different ultrasonic extraction times and tested as described above for test 5.1. The result shows that the extraction time is selected to be the best 30min, as shown in figure 3 and table 5, so that the extraction time of the test sample is determined to be 30 min.

Table 5:

investigation of extraction solvent: the test solutions were prepared with different extraction solvents and tested according to the 5.1 test method. The results showed that the number of main peaks was consistent, the difference in total peak area of the main peaks was small, RSD was 1.91%, and methanol was determined as the extraction solvent for simplification of the operation, as shown in fig. 4 and table 6.

Table 6: investigation results of different extraction solvents

Sample taking amount investigation: taking different sample quantities respectively to prepare test solution, and measuring according to a 5.1 test method. The results show that different sampling amounts, as shown in fig. 5, have consistent main peak numbers, but the ratio of the total peak area of the main peak to the sampling amount is considered to be the largest when the sampling amount of the test sample is 0.1g (see table 7 for details), so that the sampling amount of the test sample is determined to be 0.1 g.

Table 7: investigation results of different sample taking quantities

In summary, the main parameters for determining the preparation method of the test solution are as follows: taking a fried fructus viticis standard decoction sample of about 0.1g, precisely weighing, placing in a conical flask with a plug, precisely adding 25mL of methanol, sealing the plug, weighing, performing ultrasonic treatment for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, and filtering to obtain the final product.

5.3 feature Pattern analysis method verification

And (3) special investigation: the sample is taken and 10 mu L of methanol is used as a solvent, and the measurement is carried out according to 5.1 chromatographic conditions, and the test shows that the blank solvent has no interference as shown in figure 6.

And (3) repeatability test: about 0.1g and 6 parts of samples in the same batch are taken, and are measured according to 5.1 chromatographic conditions, the result shows that 6 common peaks exist in the characteristic spectrum of 6 test samples, the similarity of the specified 6 common characteristic peaks is evaluated by adopting a traditional Chinese medicine chromatographic fingerprint similarity evaluation system (2012 edition), and the relative retention time RSD is less than 3 percent (see the detailed table 8 and the figure 7), which indicates that the method has good reproducibility.

Table 8: relative retention time of characteristic spectrum of repeatability test

	S1	S2	S3	S4	S5	S6	RSD％
								S1	0.302	0.302	0.302	0.302	0.301	0.302	0.14
S2	0.318	0.318	0.318	0.318	0.318	0.318	0.00
								S3	0.408	0.408	0.408	0.408	0.407	0.408	0.10
S4	0.466	0.466	0.466	0.466	0.465	0.466	0.09
								S5	0.612	0.612	0.612	0.613	0.612	0.612	0.07
S6	1	1	1	1	1	1	0.00

And (3) precision test: about 0.1g of the same sample is taken, the sample is measured according to the 5.1 chromatographic condition, 6 needles are continuously injected for measurement, the peak shape and the peak number are basically consistent, a similarity evaluation system (2012 version) of a traditional Chinese medicine chromatographic fingerprint image is adopted to evaluate the similarity of the specified 6 common characteristic peaks, and the relative retention time RSD is less than 3 percent (see table 9 and figure 8 in detail), which indicates that the precision of the instrument is good.

Table 9: relative retention time of characteristic spectrum of precision test

	S1	S2	S3	S4	S5	S6	RSD
								S1	0.301	0.301	0.301	0.301	0.301	0.301	0.00
S2	0.318	0.318	0.317	0.317	0.317	0.317	0.16
								S3	0.407	0.407	0.407	0.407	0.406	0.406	0.13
S4	0.465	0.465	0.465	0.465	0.465	0.465	0.00
								S5	0.612	0.612	0.612	0.612	0.612	0.612	0.00
S6	1	1	1	1	1	1	0.00

And (3) stability test: about 0.1g of the same batch of samples are taken, the samples are measured according to the 5.1 chromatographic condition, the sample injection measurement is carried out respectively at 0h, 2h, 4h, 8h, 12h and 24h, the peak shape and the peak number of the characteristic spectrum are basically stable, the relative retention time RSD is less than 3 percent (see the table 10 and the figure 9 for details), and the result shows that the sample solution is stable within 24 hours.

Table 10: stability test feature profile relative retention time

5.4 Standard decoction characteristic atlas characterization analysis

Determination of standard decoction characteristic map

According to a characteristic spectrum analysis method formulated by 5.3, characteristic spectrums of 15 batches of fried vitex rotundifolia decoction pieces and 15 batches of medicinal materials used for preparing the same are measured, and the result shows that 6 common peaks exist in the characteristic chromatograms of the standard decoction pieces and the traditional Chinese medicine decoction pieces used for preparing the same and correspond to the retention time of 6 characteristic peaks in the chromatogram of a reference substance solution of a reference medicinal material, wherein the peak corresponding to the vitexin reference substance solution is peak 6, and the common peak characteristic spectrums are detailed in figures 10 to 14.

Evaluation of relative retention time of characteristic chromatogram

The similarity evaluation is carried out on the selected 6 common characteristic peaks by adopting a traditional Chinese medicine chromatogram fingerprint image similarity evaluation system (2012 edition), and the result shows that the quality of the standard decoction is relatively stable. The peak (6) corresponding to the vitexin control peak was taken as the S peak, and the relative retention time of the common peak and the S peak was calculated, and the relative retention time and range are detailed in table 11.

Table 11: 15 batches of standard decoction shared peak relative retention time

In conclusion, the method for determining the standard decoction characteristic spectrum established by the high performance liquid chromatography is adopted, and the established method is verified in precision, repeatability and stability according to the analysis method verification guiding principle (general rule 9101) of the four parts of the Chinese pharmacopoeia 2020 edition, and meets the requirements. Similarity evaluation is carried out on the characteristic maps of 15 batches of standard decoction samples by adopting a traditional Chinese medicine chromatogram fingerprint map similarity evaluation system (2012 edition), 6 common characteristic peaks are calibrated, wherein the peak 6 is vitexin. Taking the peak corresponding to the vitexin reference substance as an S peak, calculating the relative retention time of other 5 characteristic peaks, and drawing up the average value of the relative retention time of the peaks of 15 batches of samples as specified values: 0.30 (peak 1), 0.32 (peak 2), 0.41 (peak 3), 0.46 (peak 4), 0.61 (peak 5), considering the error of test operation, instrument, reagent and other multifactorial factors, the relative retention time allowed range is defined as +/-10%.

6. Determination of content

6.1 test methods

The vitexin is one of important ingredients in the fried vitex rotundifolia and one of main effective ingredients of the fried vitex rotundifolia, so the vitexin is taken as a content index ingredient.

Test methods liquid chromatography as in the above-described characteristic spectrum test.

Chromatographic conditions are as follows: a chromatographic column: c18 (250mmx4.6mm, 5um) (Waters XSelect HST 3); mobile phase: gradient elution was performed as specified in table 12 using methanol as mobile phase a and 0.1% phosphoric acid solution as mobile phase B; flow rate: 1.0 mL/min; column temperature: 35 ℃; sample introduction amount: 10 mu L of the solution; detection wavelength: 254 nm.

Table 12:

preparation of control solutions: taking a proper amount of vitexin reference substance, precisely weighing, and adding methanol to obtain a solution containing vitexin with a concentration of 5ug/ml as reference substance solution.

Preparing a test solution: taking a fried fructus viticis standard decoction sample of about 0.1g, precisely weighing, placing in a conical flask with a plug, precisely adding 25mL of methanol, sealing the plug, weighing, performing ultrasonic treatment for 30min, cooling, weighing again, supplementing the weight loss with methanol, shaking up, filtering, and using as a test solution.

6.2 methodological investigation

Investigation of extraction method: the sample solution was prepared by refluxing the sample for 30min and extracting with ultrasound (power 250W, frequency 25KHZ) for 30min, and the test was performed according to the test method 6.1. The results show that the difference between the sample reflux time of 30min and the ultrasonic time of 30min is not great, and the RSD is 0.46% (see table 13 for details), so that the ultrasonic treatment time of 30min is adopted as a more convenient and safer sample extraction method.

Table 13: comparison of different extraction methods

Examination of extraction time: the test solutions were prepared at different extraction times and tested as described above for test 6.1. The results show that the difference is not great when the sample is extracted by ultrasound (power 250W, frequency 25KHZ) for 20min, 30min and 40min, and the RSD is 3.84% (see Table 14 for details), so that a more convenient and safer extraction mode, namely ultrasound treatment for 30min, is selected.

Table 14: comparison of vitexin content at different extraction times

Investigation of extraction solvent: the test solutions were prepared with different extraction solvents and tested according to the test method 6.1 above. The results showed that the highest content was obtained when the extraction solvent was methanol, with an RSD of 16.55% (see table 15 for details), which was determined to be methanol.

Table 15: comparison of content of vitexin in different extraction solvents

Sample amount investigation: the test solutions were prepared by taking different sample amounts, and the assay was performed according to the test method 6.1 described above. As a result, the sample amount of 0.05g was 0.1g, but the main peak was sharp and the peak pattern was unclear, while the sample amount of 0.1g was higher than 0.15g (see Table 16 for details) and the peak pattern was good.

Table 16: comparison of Riboflavin content in different sample amounts

6.2 assay methodology validation

And (3) repeatability test: about 0.1g of standard decoction samples of the same batch are taken, 6 parts in total are measured according to the test method of 6.1, the average value of the vitexin content in the samples is calculated to be 0.46mg/g, the RSD value is 1.41%, and the test shows that the method has good reproducibility (see Table 17 for details).

Table 17:

and (3) precision test: taking the vitexin control solution prepared by the control solution preparation method shown in 6.1, continuously injecting a sample of 6 needles, measuring the peak area according to the test method of 6.1, and calculating the RSD value of the vitexin peak area to be 0.58%, which indicates that the instrument precision is good (see Table 18 for details).

Table 18:

and (3) stability test: about 0.1g of a batch of standard decoction samples are taken, sample injection is carried out for 0h, 3h, 6h, 12h and 24h respectively according to the test method of the 9.1, the peak areas are measured, the RSD value of the peak areas is calculated to be 1.55%, and tests show that the test solution is stable within 24 hours (see Table 19 for details).

Table 19:

linear range test: the vitexin control solution with concentration of 5.49ug/ml is respectively sampled at 1ul, 5ul, 10ul, 15ul, 20ul and 25ul, and is measured according to chromatographic condition of 6.1.

Taking the peak area of the vitexin as a vertical coordinate and the sample injection quality as a horizontal coordinate, drawing a standard curve, and performing linear regression, wherein the regression equation is as follows: y is 3225.6X +43338, R2 is 1.0000, and it is known that vitexin has a good linear relationship with its peak area in the range of 0.549 ug/ml-13.725 ug/ml (see Table 20 and FIG. 15 for details).

Table 20: vitex trifolia flavin linear relation investigation result

Sample recovery rate test: precisely weighing 0.05g of sample (the content of the vitexin is 0.46mg/g) and 6 parts in total, adding 8ml of vitexin reference solution (5.49ug/ml) with known concentration into each 6 parts of sample, preparing a test solution according to the method under 6.1, and measuring according to chromatographic conditions under 6.1 to calculate that the average sample recovery rate of the vitexin is 95.14% and the RSD is 2.48% (see table 21 for details).

Table 21: test result of vitexin sample-adding recovery rate

6.3 Standard decoction and Chinese medicinal material content determination

The fried fructus viticis medicinal material is primarily processed into slices through a producing area, the fried fructus viticis medicinal material is processed into fried fructus viticis decoction pieces after being cleaned, the fructus viticis decoction pieces are not washed and baked in the cleaning process, and the content of the vitexin of the fried fructus viticis decoction pieces cannot be changed only by screening, so that the characteristic chromatogram and the vitexin content of the fried fructus viticis decoction pieces refer to medicinal material data.

According to the proposed content analysis method, the content of 15 batches of fried fructus viticis standard decoction and 15 batches of Chinese medicinal decoction pieces fructus viticis flavin used for preparation are measured, and the results are detailed in tables 22 and 23.

Table 22: 15 batches of fried vitex rotundifolia traditional Chinese medicine decoction piece vitex rotundifolia flavin determination result

Table 23: 15 batch fried vitex rotundifolia standard decoction vitex rotundifolia flavin determination result

Vitexin content transfer rate: according to the detection method determined by standard decoction methodology research, the content transfer rate of vitexin is calculated for 15 batches of standard decoction and the determination results of traditional Chinese medicine decoction pieces used for preparation, the mass transfer condition is mastered, and a basis is provided for formulating the internal control standard of materials and the allowable range of characterization parameters. The parched fructus Vitics Simplicifoliae decoction piece standard decoction is prepared by decocting parched fructus Vitics Simplicifoliae decoction piece in water for 2 times, concentrating the filtrate, and freeze drying. The vitexin content transfer rate is detailed in table 24.

Table 24: 15 batches of chastetree fruit decoction piece standard decoction vitexin content transfer rate

According to the data, the fried fructus viticis decoction pieces are decocted according to a scheme to prepare the fried fructus viticis decoction piece standard decoction, the average content of the vitexin is 1.31mg/g, the content value range is measured to be 0.85-1.77 mg/g, SD: 0.317. calculated according to the average value of 70-130%, the allowable range of the vitexin content is 0.917-1.703mg/g, calculated according to the low limit of-2 SD and the high limit of + 3SD, and the allowable range of the vitexin content is 0.676-2.261 mg/g.

According to the data, the fried chastetree fruit decoction pieces are decocted according to the scheme to prepare the fried chastetree fruit decoction piece standard decoction, the average transfer rate of the vitexin is 24.47%, the range of the measured transfer rate is 16.66-38.80%, and the SD: 6.66. according to technical requirements for quality control and standard formulation of traditional Chinese medicine formula granules, the allowable range of the vitexin content transfer rate is 17.13-31.81 percent according to 70-130 percent of the mean transfer rate. The allowable range of the content transfer rate is 4.49-44.45% calculated according to +/-3 SD. According to the data, the content determination limit of the vitexin in the standard decoction is drawn up as follows: 0.70 mg/g-2.25 mg/g, and the allowable range of the content transfer rate is 5.0% -44.5%. The results show that the vitexin content and the transfer rate thereof in the 15 batches of standard decoction are within the allowable range, and reference basis can be provided for the quality research of the stir-fried vitex rotundifolia formula granules.

According to the quality detection method for the fried fructus viticis standard decoction, the properties of the fried fructus viticis standard decoction, the dry extract yield, the thin-layer identification, the extract, the characteristic spectrum and the vitexin content determination are researched, the quality of the fried fructus viticis standard decoction is evaluated through multi-aspect measurement, a solid foundation is laid for the quality stability of products, a feasible quality standard of the fried fructus viticis decoction can be established, the quality of the fried fructus viticis standard decoction is effectively controlled, and a chromatogram with better and clearer resolution can be obtained by performing liquid phase analysis under the chromatographic conditions. The fried fructus viticis decoction pieces are prepared into fried fructus viticis decoction piece standard decoction according to a decoction method, the average content of vitexin is 1.31mg/g, the detected content range is 0.85-1.77 mg/g, SD (standard deviation) is 0.317, the allowable range of vitexin content is 0.917-1.703mg/g calculated according to 70-130% of the average value, the allowable range of vitexin content is 0.676-2.261 mg/g calculated according to low limit (-2 SD) and high limit (-3 SD), so the content range of vitexin of the standard decoction is drawn as follows: 0.70 mg/g-2.25 mg/g; the average transfer rate of the vitexin is 24.47%, the transfer rate range is 16.66-38.80%, the SD is 6.66, according to technical requirements for quality control and standard formulation of Chinese medicinal granules, the allowable range of the vitexin content transfer rate is 17.13-31.81% calculated according to 70-130% of the transfer rate average value, and is 4.49-44.45% calculated according to +/-3 SD, so that the vitexin content transfer rate range of the standard decoction is determined as follows: 5.0-44.5%, and the result shows that the vitexin content and the transfer rate thereof in the standard decoction of a plurality of batches are within the allowable range, so the invention can provide reference basis for the quality standard research of the stir-fried vitex rotundifolia formula particles.

Those skilled in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to those examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.