阅读说明：本技术 一种分离测定沙库巴曲钙盐及其异构体的方法 (Method for separating and measuring Shakubatroxa calcium salt and isomer thereof ) 是由 潘呈恭 潘先文 代广会 杨欢 谢云 高亚 何伟 张燕 于 2020-12-29 设计创作，主要内容包括：一种分离测定沙库巴曲钙盐及其异构体的方法,具有以下步骤,1)取沙库巴曲钙盐,加稀释剂溶解,得到浓度为0.1-10mg/ml的试样溶液；2)取步骤1)得到的试样溶液,加稀释剂稀释50-1000倍,得到对照溶液；3)分别向高效液相色谱仪进样等体积的试样溶液和对照溶液,采用流动相A和流动相B作为流动相进行梯度洗脱,记录色谱图,完成试样溶液中杂质的分离测定。本发明操作简单、方便,可有效实现沙库巴曲钙盐及其异构体、异构体与异构体之间的分离和测定,从而实现控制沙库巴曲钙盐及其产品质量的目的。(A method for separating and measuring Sacubitril calcium salt and its isomer comprises 1) taking Sacubitril calcium salt, adding diluent to dissolve, to obtain sample solution with concentration of 0.1-10 mg/ml; 2) taking the sample solution obtained in the step 1), and adding a diluent to dilute the sample solution by 50-1000 times to obtain a control solution; 3) injecting equal volumes of sample solution and control solution into a high performance liquid chromatograph, performing gradient elution by using a mobile phase A and a mobile phase B as mobile phases, recording a chromatogram, and completing separation and determination of impurities in the sample solution. The method is simple and convenient to operate, and can effectively realize the separation and determination of the Sacubitril calcium salt and the isomer thereof, and the separation and determination of the isomer and the isomer thereof, thereby realizing the purpose of controlling the quality of the Sacubitril calcium salt and the product thereof.)

1. A method for separating and determining a shakubatrox calcium salt and isomers thereof is characterized by comprising the following steps:

1) preparation of sample solution

Dissolving Sacubitril calcium salt with diluent to obtain sample solution with concentration of 0.1-10 mg/ml;

2) preparation of control solutions

Taking the sample solution obtained in the step 1), and adding a diluent to dilute the sample solution by 50-1000 times to obtain a control solution;

3) injecting equal volumes of the sample solution of step 1) and the control solution of step 2) into a high performance liquid chromatograph respectively, wherein the injection amount is 5-100 mul,

gradient elution is carried out by adopting a mobile phase A and a mobile phase B as mobile phases, the flow rate of the mobile phases is 0.4-0.8ml/min, the separation and the determination of isomers in a sample solution are completed by utilizing the detection of wavelengths from 200nm to 280nm and recording chromatograms,

the high performance liquid chromatograph adopts a polysaccharide derivative reverse phase coating type chiral chromatographic column or a cellulose derivative reverse phase coating type chiral chromatographic column, the mobile phase A is a buffer solution with the volume concentration of 0.0001-1.0%, the mobile phase B is an acetonitrile-methanol mixed solution, and the volume ratio of acetonitrile to methanol is 75-85: 25-15, adding 0-1 volume part of phosphoric acid into 100 volume parts of mobile phase B, and allowing the mobile phase to enter a chromatographic column in a gradient elution mode for 0 minute, wherein the volume percent of the mobile phase A is 65-75%, and the volume percent of the mobile phase B is 35-25%; from 0 minutes to 50 minutes, the volume fraction of mobile phase a decreased linearly to 55% -45%, and the volume fraction of mobile phase B increased linearly to 45% -55%; from 50 minutes to 50.1 minutes, the volume fraction of mobile phase a increased linearly to 65% -75%, and the volume fraction of mobile phase B decreased linearly to 35% -25%; from 50.1 minutes to 60 minutes, the volume fraction of the mobile phase A is 65-75%, and the volume fraction of the mobile phase B is 35-25%.

2. The method as claimed in claim 1, wherein the diluent in step 1) and step 2) is a mixed solution of methanol and water, and the volume ratio of methanol to water is 75-95: 25-5.

3. The method according to claim 2, wherein the volume ratio of methanol to water is 80: 20.

4. the method of claim 1, wherein the buffer solution of step 3) has a volume concentration of 0.001-0.2%.

5. The method according to claim 1 or 4, wherein the buffer solution is phosphoric acid solution and/or phosphate solution, and the phosphate is any one or mixture of potassium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate and diammonium hydrogen phosphate.

6. The method of claim 1, wherein the polysaccharide derivative of step 3) is amylose; the cellulose derivative is cellulose-tris (3-chloro-4-methylphenyl carbamate, cellulose-tris (3, 5-dimethylphenyl carbamate), cellulose-tris (4-chloro-3-methylphenyl carbamate), cellulose-tris (4-methylbenzoate).

7. The method according to claim 1, wherein the mobile phase in step 3) enters the chromatographic column by adopting a gradient elution mode, and the volume percentage of the mobile phase A is 70 percent and the volume percentage of the mobile phase B is 30 percent in 0 minute; from 0 minutes to 50 minutes, the volume percent of mobile phase a decreased linearly to 50%, and the volume percent of mobile phase B increased linearly to 50%; from 50 minutes to 50.1 minutes, the volume percent of mobile phase a increased linearly to 70%, and the volume percent of mobile phase B decreased linearly to 30%; from 50.1 minutes to 60 minutes, the volume percent of mobile phase a was 70% and the volume percent of mobile phase B was 30%.

8. The method according to claim 1, wherein the sample amount in step 3) is 10 μ l, the detection is carried out by using a wavelength of 255nm, and the column temperature of the chromatographic column is 15-40 ℃.

9. The method of claim 8, wherein the column temperature of the chromatography column is 30 ℃.

Technical Field

The invention relates to the field of analytical chemistry, in particular to a method for separating and determining a shakubatroxobin salt and an isomer thereof.

Background

The calcium salt of Sacubitril is a prodrug of NEP inhibitor developed by Nowa, and is also an experimental drug. The action mechanism can block 2 polypeptides threatening the blood pressure reduction, and is mainly used for developing the medicine for treating hypertension and heart failure. LCZ696 formed by combining the sabotara calcium and the valsartan is the first dual inhibitor of angiotensin receptor type 2 (AT II) and enkephalinase, the clinical curative effect is obvious, and the LCZ696 is approved by FDA and marketed in 7 months of 2015, and the sabotara calcium is used as a structural fragment in the molecular structure of the LCZ696 tablet and can also be regarded as a single medicine, so that a control index is established for related substances of the calcium, and the calcium is a very key control item in quality standards. The chemical name of the Shakuba kojic calcium salt is as follows: the calcium salt of (2R,4S) -5-biphenyl-4-yl-4- (3-carboxyl propionyl amino) -2-methyl-ethyl valerate has a chemical structural formula shown in a formula (a).

The product has 2 chiral centers, so that the product has 1 enantiomer, which is called impurity AHUA for short, and 2 diastereoisomers, which are called impurity AHUB and impurity AHUC for short, and the structural formulas are respectively shown as formulas (b), (c) and (d).

For the separation and detection of isomers, particularly enantiomers, a conventional chiral column is generally adopted, and the separation and detection are carried out by utilizing a forward chromatography, and the detection method has the defects of poor formed base line and poor peak shape, so that the detection requirement is difficult to achieve.

In order to accurately control the quality of the Sacubitril calcium, it is necessary to find an HPLC determination method which can effectively separate the Sacubitril calcium from its isomers. The method has important significance for realizing the separation of the Sacubitril calcium and the isomer thereof in the synthesis of the Sacubitril calcium and the quality control of the preparation.

Disclosure of Invention

The invention aims to provide a method for separating and determining the Sacubitril calcium salt and the isomer thereof, which is simple and convenient to operate and can effectively realize the separation and determination of the Sacubitril calcium salt and the isomer thereof as well as the isomer and the isomer thereof, thereby realizing the purpose of controlling the quality of the Sacubitril calcium salt and the product thereof.

The technical scheme of the invention is as follows: a method for separating and determining a shakubatrox calcium salt and isomers thereof comprises the following steps:

1) preparation of sample solution

Dissolving Sacubitril calcium salt with diluent to obtain sample solution with concentration of 0.1-10 mg/ml;

2) preparation of control solutions

Taking the sample solution obtained in the step 1), and adding a diluent to dilute the sample solution by 50-1000 times to obtain a control solution;

3) injecting equal volumes of the sample solution of step 1) and the control solution of step 2) into a high performance liquid chromatograph respectively, wherein the injection amount is 5-100 mul,

gradient elution is carried out by adopting a mobile phase A and a mobile phase B as mobile phases, the flow rate of the mobile phases is 0.4-0.8ml/min, the separation and the determination of isomers in a sample solution are completed by utilizing the detection of wavelengths from 200nm to 280nm and recording chromatograms,

the high performance liquid chromatograph adopts a polysaccharide derivative reverse phase coating type chiral chromatographic column or a cellulose derivative reverse phase coating type chiral chromatographic column, the mobile phase A is a buffer solution with the volume concentration of 0.0001-1.0%, the mobile phase B is an acetonitrile-methanol mixed solution, and the volume ratio of acetonitrile to methanol is 75-85: 25-15, adding 0-1 volume part of phosphoric acid into 100 volume parts of mobile phase B, and allowing the mobile phase to enter a chromatographic column in a gradient elution mode for 0 minute, wherein the volume percent of the mobile phase A is 65-75%, and the volume percent of the mobile phase B is 35-25%; from 0 minutes to 50 minutes, the volume fraction of mobile phase a decreased linearly to 55% -45%, and the volume fraction of mobile phase B increased linearly to 45% -55%; from 50 minutes to 50.1 minutes, the volume fraction of mobile phase a increased linearly to 65% -75%, and the volume fraction of mobile phase B decreased linearly to 35% -25%; from 50.1 minutes to 60 minutes, the volume fraction of the mobile phase A is 65-75%, and the volume fraction of the mobile phase B is 35-25%.

Specifically, the diluent in the step 1) and the step 2) is a mixed solution of methanol and water, and the volume ratio of the methanol to the water is 75-95: 25-5.

Preferably, the volume ratio of methanol to water is 80: 20.

preferably, the volume concentration of the buffer solution in the step 3) is 0.001-0.2%.

Specifically, the buffer solution is a phosphoric acid solution and/or a phosphate solution, and the phosphate is any one or a mixture of potassium dihydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, dipotassium hydrogen phosphate, disodium hydrogen phosphate and diammonium hydrogen phosphate.

Specifically, the polysaccharide derivative in the step 3) is amylose; the cellulose derivative is cellulose-tris (3-chloro-4-methylphenyl carbamate, cellulose-tris (3, 5-dimethylphenyl carbamate), cellulose-tris (4-chloro-3-methylphenyl carbamate), cellulose-tris (4-methylbenzoate).

Preferably, the mobile phase in the step 3) enters the chromatographic column by adopting a gradient elution mode, and the volume percentage of the mobile phase A is 70 percent and the volume percentage of the mobile phase B is 30 percent within 0 minute; from 0 minutes to 50 minutes, the volume percent of mobile phase a decreased linearly to 50%, and the volume percent of mobile phase B increased linearly to 50%; from 50 minutes to 50.1 minutes, the volume percent of mobile phase a increased linearly to 70%, and the volume percent of mobile phase B decreased linearly to 30%; from 50.1 minutes to 60 minutes, the volume percent of mobile phase a was 70% and the volume percent of mobile phase B was 30%.

Preferably, the sample amount in the step 3) is 10 μ l, the detection is carried out by using a wavelength of 255nm, and the column temperature of the chromatographic column is 15-40 ℃.

Preferably, the column temperature of the column is 30 ℃.

Adopt above-mentioned technical scheme to have following beneficial effect:

1. the separation and determination method adopts high performance liquid chromatography, takes a polysaccharide derivative reverse phase coating type chiral chromatographic column or a cellulose derivative reverse phase coating type chiral chromatographic column as a chromatographic column, takes buffer solution as a mobile phase A, takes acetonitrile-methanol mixed solution as a mobile phase B, can effectively separate and determine the shakubatroxobin salt and the isomer thereof, the isomer and the isomer, and has strong specificity, wherein the separation degree of a main peak and an isomer impurity peak and the separation degree of isomer impurities meet the requirements (the separation degree of the main peak and the isomer impurity peak is 3.17, and the separation degree of adjacent isomer impurities is 1.84).

2. The separation and determination method of the invention adopts a self-contrast method of adding correction factors to calculate the content of each isomer in a sample as the impurity, the accuracy is high, the minimum relative detection limit of each isomer is 0.001 percent, which indicates that the isomer with the content of more than 0.001 percent can be detected, and the separation and determination method is a separation and determination method with higher precision.

3. The mobile phase A and the mobile phase B used in the separation and determination method are simple and convenient to prepare, and the used reagents are common reagents, so that the method is economical and practical. The mixed solution of water and methanol is selected as a diluent to dissolve the sample, so that the sample can be prevented from being separated out in a mobile phase; the volume ratio of the mobile phase A to the mobile phase B is adjusted by adopting a gradient elution mode, so that the effective separation between the shakubatroxobin salt and the isomer can be ensured; and the mobile phase A is matched, so that the retention can be enhanced, the separation degree can be improved, and the good symmetry and the higher column efficiency of a chromatographic peak can be ensured. The number of theoretical plates of the product and each impurity is more than 15000, and the tailing factor of each known impurity peak is between 0.95 and 1.05. If the volume ratio of the mobile phase A to the mobile phase B is not adjusted in a gradient manner, or the ratio of acetonitrile to methanol components of the mobile phase B is not 75-85: 25-15, the main peak and the isomer impurity peak have poor separation degree or even cannot be separated.

The separation and determination method effectively solves the problem that the sargassum calcium salt and the isomer thereof are difficult to separate, and can accurately determine the content of the sargassum calcium salt and the isomer impurity thereof, thereby ensuring the controllable quality of the sargassum calcium salt and the preparation thereof.

The following further description is made with reference to the accompanying drawings and detailed description.

Drawings

FIG. 1 is a liquid chromatogram of a methanol-water mixed solution in example 1;

FIG. 2 is a liquid chromatogram of the mixed control solution of example 1;

FIG. 3 is a liquid chromatogram of the sample solution in example 2;

FIG. 4 is a liquid chromatogram of the control solution of example 2.

Detailed Description

Apparatus and conditions

The high performance liquid chromatograph selects an Agilent liquid chromatograph and a chemical workstation and is set as an automatic sample introduction. An CHIRALCEL OJ-RH column (5 μm, 150X 4.6mm) was used as a column. Wavelength of ultraviolet detector: 255 nm. Mobile phase: phosphoric acid solution with volume concentration of 0.01% is used as mobile phase A, and acetonitrile-methanol-phosphoric acid (with volume ratio of 800: 200: 1) is used as mobile phase B. Gradient elution mode: 0 minute, the volume percent of mobile phase a was 70%, and the volume percent of mobile phase B was 30%; from 0 minutes to 50 minutes, the volume percent of mobile phase a decreased linearly to 50%, and the volume percent of mobile phase B increased linearly to 50%; from 50 minutes to 50.1 minutes, the volume percent of mobile phase a increased linearly to 70%, and the volume percent of mobile phase B decreased linearly to 30%; from 50.1 minutes to 60 minutes, the volume percent of mobile phase a was 70% and the volume percent of mobile phase B was 30%. Column temperature 35 ℃, flow rate: 0.6 ml/min. The injection volume was 10. mu.l.

Example 1

Respectively taking 25mg of impurities AHUA, AHUB and AHUC (the purity of AHUA, AHUB and AHUC is more than 99%), precisely weighing, placing in a 50ml measuring flask, adding methanol-water (volume ratio is 80: 20) for dissolving and diluting to scale, shaking uniformly, and using as impurity stock solution; taking 25mg of Sacubidus calcium salt, accurately weighing, placing in a 50ml measuring flask, accurately adding 0.1ml of impurity stock solution, adding methanol-water (volume ratio of 80: 20) for dissolving and diluting to scale, shaking up to obtain a mixed control solution, and mixing the solute with the Sacubidus calcium salt of 0.5mg/ml and known impurity concentration of 1 microgram/ml.

The liquid chromatography analysis was carried out under the above-mentioned chromatographic conditions using methanol-water (volume ratio 80: 20) and a mixed control solution, and chromatograms were recorded, and the results are shown in fig. 1 and 2.

Figure 1 shows that the methanol-water mixture and the chromatographic system do not interfere with the assay.

In FIG. 2, the sequential order of peaks is Sacubitril calcium salt, impurity AHUC, impurity AHUA, impurity AHUB. Fig. 2 shows that the separation and determination method can effectively separate the Sacubitril calcium salt and isomers thereof, and can be used for determining the isomers in the Sacubitril calcium salt.

Example 2 determination of Sacubitril calcium salt drug substance (supplied by Chongqing Sansheng industries, Ltd.)

Taking 25mg of a shakubatrox calcium salt raw material medicine, precisely weighing, placing in a 50ml measuring flask, adding methanol-water (volume ratio is 80: 20) for ultrasonic treatment, dissolving, diluting to a scale, and shaking up to obtain a sample solution; precisely measuring 0.5ml of sample solution, placing in a 200ml measuring flask, diluting with methanol-water (volume ratio of 80: 20) to scale, and shaking to obtain control solution; liquid chromatography analysis was performed under the chromatographic conditions of example 1, and chromatograms were recorded, with the results shown in fig. 3 and 4. And calculating the content of each isomer impurity in the sample by adopting a self-comparison method of the correction factor. The detection results are shown in table 1:

TABLE 1

Impurities	Content (wt%)
		AHUC	0.02
AHUB	0.1
		AHUA	0.004