阅读说明：本技术 一种从光果甘草渣制备光甘草定和甘草多糖的方法 (A method for preparing glabridin and Glycyrrhiza polysaccharide from Glycyrrhiza glabra residue ) 是由 季浩 胡亚京 阚建伟 窦长清 孔繁博 徐娟 于 2020-12-31 设计创作，主要内容包括：本发明涉及一种从光果甘草渣制备光甘草定和甘草多糖的方法,包括提取、萃取、纯化、精制、甘草多糖的提取的步骤。与现有技术比,本发明所述的方法流程清晰、方法易操作、成本低,纯化得到的产品颜色好、纯度高。同时最大限度的利用甘草,避免浪费。(The invention relates to a method for preparing glabridin and glycyrrhiza polysaccharide from glycyrrhiza glabra residues, which comprises the steps of extracting, purifying, refining and extracting glycyrrhiza polysaccharide. Compared with the prior art, the method has the advantages of clear flow, easy operation, low cost, and good color and high purity of the purified product. Meanwhile, the liquorice is utilized to the maximum extent, and waste is avoided.)

1. A method for preparing glabridin and glycyrrhiza polysaccharide from glycyrrhiza glabra residues is characterized by comprising the following steps:

1. extraction: weighing appropriate amount of Glycyrrhiza glabra residue, performing primary extraction and secondary extraction with ethanol, mixing the two extractive solutions, and concentrating the mixed extractive solution to obtain paste;

2. and (3) extraction: taking the paste in the step 1, adding water, suspending the paste by stirring, adding ethyl acetate with the same volume, fully stirring, extracting, taking the upper layer solution, and concentrating to paste to obtain an ethyl acetate part;

3. and (3) purification: filling a column with macroporous resin, and roughly dividing the ethyl acetate part:

a. primary purification: adding 8-10 times of 95% ethanol into the ethyl acetate part, dissolving, sampling, performing primary purification on the macroporous resin, wherein the weight of the macroporous resin is 10-15 times of that of the ethyl acetate part, the eluting solvent is ethanol-water, the proportions of the ethanol-water are 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol in sequence, collecting 60% ethanol fraction and 80% ethanol fraction, combining, concentrating under reduced pressure, and freeze-drying to obtain a sample A;

b. and (3) secondary purification: taking a sample A, adding 5-8 times of 95% ethanol, dissolving, sampling, performing secondary purification on the macroporous resin, wherein the weight of the macroporous resin is 15-20 times of that of the sample A, the eluting solvent is ethanol-water, the proportions of the ethanol-water are 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol in sequence, collecting 70% ethanol fraction and 80% ethanol fraction, combining, concentrating under reduced pressure, and freeze-drying to obtain a sample B;

4. refining: taking a sample B, adding 5-8 times of methanol, dissolving, separating by using a reverse phase chromatographic column, wherein the weight of a reverse phase silica gel filler is 15-20 times that of the sample B, an eluting solvent is methanol-water which is 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol in sequence, collecting 60% methanol fraction and 70% methanol fraction, combining, concentrating under reduced pressure, freezing and drying to obtain a sample C; liquid phase detection shows that the content of glabridin in the sample C is more than 90 percent;

5. and (3) extraction of glycyrrhiza polysaccharide: and (2) taking the residual glycyrrhiza glabra residues extracted in the step (1), adding water, carrying out primary water extraction and secondary water extraction at 90 +/-5 ℃, combining the two water extracts, combining the water layers extracted in the step (2), concentrating, adding activated carbon, heating, filtering, concentrating the filtrate into a non-flowing paste, adding ethanol, fully stirring, standing overnight, filtering the precipitate, and freeze-drying the precipitate to obtain the glycyrrhiza polysaccharide.

2. The method of claim 1, wherein step 1 comprises the steps of:

carrying out first extraction: weighing appropriate amount of Glycyrrhiza glabra residues, adding 10-20 times of 80% -95% ethanol, and heating and refluxing at 70-75 deg.C for 2-3h to obtain primary extractive solution and Glycyrrhrizae glabra residues; discharging the primary extracting solution, and performing secondary extraction on the glycyrrhiza glabra residue after the primary extraction, wherein the secondary extraction process comprises the following steps: adding 10-20 times of 80% -95% ethanol into the primarily extracted glycyrrhiza glabra residue, and heating and refluxing at 70-75 deg.C for 2-3h to obtain secondary extractive solution and the rest glycyrrhiza glabra residue; mixing the primary extractive solution and the secondary extractive solution to obtain mixed extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

3. The method of claim 1, wherein step 2 comprises the steps of:

taking the paste obtained in the step 1, adding water with the weight being 20-30 times of that of the paste, suspending the paste by stirring, adding ethyl acetate with the same volume, fully stirring, extracting, taking the upper layer solution, and concentrating at 75 +/-2 ℃ to obtain an ethyl acetate part; by volume is meant that the volume of ethyl acetate is the same as the volume of water.

4. The method of claim 1, wherein in step 3, the sample A is obtained by vacuum concentration at 70 ± 2 ℃ and freeze-drying; vacuum concentrating at 70 + -2 deg.C, and freeze drying to obtain sample B; and 4, decompressing and concentrating at 60 +/-2 ℃, and freeze-drying to obtain a sample C.

5. The method of claim 1, wherein in step 3, the content of glabridin in sample B is greater than 40% by liquid phase detection.

6. The method of claim 1, wherein step 5 comprises the steps of: carrying out first water extraction: taking the residual glycyrrhiza glabra residues extracted in the step 1, adding water which is 20-30 times of the weight of the residual glycyrrhiza glabra residues, heating and refluxing for 2-3h at 90 +/-5 ℃ to obtain a primary water extract and the glycyrrhiza glabra residues subjected to primary water extraction, and then performing secondary water extraction: adding water 20-30 times the weight of the first water-extracted Glycyrrhiza glabra residue into the first water-extracted Glycyrrhiza glabra residue, and heating and refluxing at 90 + -5 deg.C for 2-3 hr to obtain a second water extract and a second water-extracted Glycyrrhiza glabra residue; the primary water extract and the secondary water extract are both extracting solutions; combining the primary water extract and the secondary water extract, and combining the water layers extracted in the step 2 to obtain a combined solution; concentrating the combined solution to 0.1-0.3 times of the original volume to obtain concentrated solution; adding active carbon 0.1-0.5% of the concentrated solution, heating at 70-80 deg.C for 50-70min, filtering, concentrating the filtrate to obtain a non-flowing paste, adding 95% ethanol 5-10 times of the paste, stirring, standing overnight, filtering the precipitate, and freeze drying the precipitate to obtain Glycyrrhiza polysaccharide.

7. The method of claim 2, wherein the ethanol content in step 1 is 85-95% and the amount of ethanol is 10-15 times.

8. The method of claim 1, wherein the amount of water added in step 2 is 25-30 times the amount of the paste.

9. The method of claim 1, wherein in step 3, the primary purified macroporous resin is any one of AB-8, D-101, XAD-16, HPD-600 and H3520, and the secondary purified macroporous resin is any one of AB-8, D-101 and HPD-600.

10. The method of claim 1, wherein in step 5, the extraction temperature of the first water extraction and the extraction time of the second water extraction are both 90-95 ℃, the extraction time is 2.5h-3h, and the amount of activated carbon is 0.1-0.3% of the weight of the concentrated solution.

Technical Field

The invention relates to a method for preparing glabridin and glycyrrhiza polysaccharide from glycyrrhiza glabra residues, belonging to the technical field of pharmaceutical chemical industry.

Background

The medicinal parts of the liquorice are roots and rhizomes, which are common bulk medicinal materials, can be used as both medicine and food, three medicinal parts are recorded in pharmacopoeia, namely Ural liquorice, bloated fruit liquorice and glabrous liquorice, are very similar in appearance, and have similar main components, however, Glabridin is a unique chemical component of glabrous liquorice, Glabridin (Glabridin) is a natural substance with a very outstanding whitening effect, accounts for about 0.2% of glabrous liquorice, and has the main effects of: 1. whitening and inhibiting melanogenesis; 2. anti-inflammatory effects; 3. antioxidation; 4. and (4) resisting bacteria. In the various cosmetic raw materials, the price of the glabridin is quite expensive, wherein the unit price of 90 percent of the glabridin reaches 21W/kg, the glabridin is more expensive to import, and the price of the glabridin is comparable to that of gold, namely 'whitening gold'.

The glycyrrhiza uralensis contains a certain amount of glycyrrhiza uralensis polysaccharide (the content is greatly different in different areas and different growth years, and the content is lower as the growth years are longer), and the glycyrrhiza uralensis polysaccharide is a kind of alpha-D-pyran polysaccharide extracted from glycyrrhiza uralensis, is a natural plant polysaccharide, and has antiviral, immunoregulatory and antitumor activities.

The glycyrrhiza glabra residue after the glycyrrhiza is extracted from the glycyrrhizic acid contains licoflavone and glycyrrhiza polysaccharide.

Disclosure of Invention

In order to overcome the defects, the invention provides a method for preparing glabridin and glycyrrhiza polysaccharide from glabrous residues, which is simple in method, low in cost and high in final product content, and the glabridin and the glycyrrhiza polysaccharide can be prepared by effectively using the glabrous residues.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps: a method for preparing glabridin and glycyrrhiza polysaccharide from glycyrrhiza glabra residues is characterized by comprising the following steps:

1. extraction: weighing appropriate amount of Glycyrrhiza glabra residue, performing primary extraction and secondary extraction with ethanol, mixing the two extractive solutions, and concentrating the mixed extractive solution to obtain paste;

2. and (3) extraction: taking the paste in the step 1, adding water, suspending the paste by stirring, adding ethyl acetate with the same volume, fully stirring, extracting, taking the upper layer solution, and concentrating to paste to obtain an ethyl acetate part;

3. and (3) purification: selecting a macroporous resin packed column (the primary purification macroporous resin is filled in one column to form the primary purification macroporous resin packed column for primary purification, and the secondary purification macroporous resin is filled in the other column to form the secondary purification macroporous resin packed column for secondary purification), roughly dividing the ethyl acetate part:

a. primary purification: adding 8-10 times of 95% ethanol into the ethyl acetate part, dissolving, sampling, performing primary purification on the macroporous resin, wherein the weight of the macroporous resin is 10-15 times of that of the ethyl acetate part, the eluting solvent is ethanol-water, the proportions of the ethanol-water are 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol in sequence, collecting 60% ethanol fraction and 80% ethanol fraction, combining, concentrating under reduced pressure, and freeze-drying to obtain a sample A;

b. and (3) secondary purification: taking a sample A, adding 5-8 times of 95% ethanol, dissolving, sampling, performing secondary purification on the macroporous resin, wherein the weight of the macroporous resin is 15-20 times of that of the sample A, the eluting solvent is ethanol-water, the proportions of the ethanol-water are 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol in sequence, collecting 70% ethanol fraction and 80% ethanol fraction, combining, concentrating under reduced pressure, and freeze-drying to obtain a sample B;

4. refining: taking a sample B, adding 5-8 times of methanol (pure methanol, the same below) for dissolving, separating by using a reverse phase chromatographic column, wherein the weight of a reverse phase silica gel filler is 15-20 times of that of the sample B (the reverse phase silica gel filler is filled in the reverse phase chromatographic column), an eluting solvent is methanol-water, and sequentially comprises 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol, collecting 60% methanol fraction and 70% methanol fraction, combining, concentrating under reduced pressure, and freeze-drying to obtain a sample C; liquid phase detection, wherein the content of the glabridin in the sample C is more than 90% (mass percentage);

5. and (3) extraction of glycyrrhiza polysaccharide: and (2) taking the residual glycyrrhiza glabra residues extracted in the step (1), adding water, carrying out primary water extraction and secondary water extraction at 90 +/-5 ℃, combining the two water extracts, combining the water layers extracted in the step (2), concentrating, adding activated carbon, heating, filtering, concentrating the filtrate into a non-flowing paste, adding ethanol, fully stirring, standing overnight, filtering the precipitate, and freeze-drying to obtain the glycyrrhiza polysaccharide.

The step 1 specifically comprises the following steps: carrying out first extraction: weighing appropriate amount of Glycyrrhiza glabra residue, adding 10-20 times of 80-95% ethanol (the times are weight volume times, 80-95% ethanol: Glycyrrhiza glabra residue: 10-20: 1, for example, 10-20L 80-95% ethanol is required to be added into 1kg of Glycyrrhiza glabra residue), heating and refluxing at 70-75 deg.C for 2-3h to obtain primary extractive solution (the extractive solution obtained by the first extraction) and the Glycyrrhiza glabra residue after the first extraction (the residual Glycyrrhiza glabra residue after the first extraction); discharging the primary extracting solution, and performing secondary extraction on the glycyrrhiza glabra residue after the primary extraction, wherein the secondary extraction process comprises the following steps: adding 10-20 times of 80-95% ethanol (weight volume times, 80-95% ethanol: 10-20: 1, for example, 10-20L of 80-95% ethanol is added to 1kg of the primarily extracted Glycyrrhiza glabra residue), and heating and refluxing at 70-75 deg.C for 2-3 hr to obtain secondary extractive solution (the extractive solution obtained by the secondary extraction) and the rest of Glycyrrhiza glabra residue (the residue obtained by the secondary extraction); mixing the primary extractive solution and the secondary extractive solution to obtain mixed extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

The 80-95% ethanol is ethanol water solution, and the volume ratio of ethanol to water is 80-95: 5-20. Hereinafter, the% of 10% ethanol (ethanol to water volume ratio of 10: 90), 20% ethanol (ethanol to water volume ratio of 20: 80), 40% ethanol (ethanol to water volume ratio of 40: 60), 60% ethanol (ethanol to water volume ratio of 60: 40), 80% ethanol (ethanol to water volume ratio of 80: 20), 95% ethanol (ethanol to water volume ratio of 95: 5), 70% ethanol (ethanol to water volume ratio of 70: 30) is by volume.

The step 2 specifically comprises the following steps: taking the paste obtained in the step 1, adding water with the weight of 20-30 times of the weight of the paste (the weight of water is 20-30 times of the weight of the paste), suspending the paste by stirring, adding ethyl acetate with the same volume, fully stirring, extracting, taking an upper layer solution, and concentrating at 75 +/-2 ℃ to obtain an ethyl acetate part; by volume is meant that the volume of ethyl acetate is the same as the volume of water.

In the step 3, decompressing and concentrating at 70 +/-2 ℃, and freeze-drying to obtain a sample A; vacuum concentrating at 70 + -2 deg.C, and freeze drying to obtain sample B; and 4, decompressing and concentrating at 60 +/-2 ℃, and freeze-drying to obtain a sample C.

In the step 3, through liquid phase detection, the content of the glabridin in the sample B is more than 40% (mass percentage content). In the step 5, an ultraviolet-visible spectrophotometer is used for content detection, and the content of the glycyrrhiza polysaccharide is more than 60% (mass percentage content).

The step 5 specifically comprises the following steps: carrying out first water extraction: taking the residual glycyrrhiza glabra residues after the second extraction in the step (1), adding water which is 20-30 times of the weight of the residual glycyrrhiza glabra residues (namely the weight of the water is 20-30 times of the weight of the residual glycyrrhiza glabra residues), heating and refluxing for 2-3h at 90 +/-5 ℃ to obtain a primary water extract (referring to an extracting solution obtained by the first water extraction) and the glycyrrhiza glabra residues after the first water extraction (referring to the residual glycyrrhiza glabra residues after the first water extraction), and then carrying out the second water extraction: adding water 20-30 times the weight of the first water-extracted Glycyrrhiza glabra residue into the first water-extracted Glycyrrhiza glabra residue, and heating and refluxing at 90 + -5 deg.C for 2-3h to obtain a second water extract (the extractive solution obtained by the second water extraction) and a second water-extracted Glycyrrhiza glabra residue (the residual Glycyrrhiza glabra residue obtained by the second water extraction); the primary water extract and the secondary water extract are both extracting solutions; combining the primary water extract and the secondary water extract, and combining the water layers extracted in the step (2) (namely the lower layer solution extracted by the ethyl acetate in the step (2)) to obtain a combined solution (namely the combined solution is formed by mixing the primary water extract, the secondary water extract and the water layers extracted in the step (2)); concentrating the combined solution to 0.1-0.3 times of the original volume (volume of the combined solution before concentration) to obtain concentrated solution (so that the volume of the concentrated solution is 0.1-0.3 times of the volume of the combined solution); adding 0.1-0.5% of activated carbon (i.e. activated carbon is 0.1-0.5% of the weight of the concentrated solution), heating at 70-80 deg.C for 50-70min, filtering, concentrating the filtrate to obtain a non-flowing paste, adding 5-10 times of 95% ethanol (multiple times are weight volume multiple, 95% ethanol volume: paste weight =5-10:1, for example, 1kg of paste, 5-10L of 95% ethanol is required to be added, and 95% ethanol is composed of ethanol and water with volume ratio of 95: 5), stirring thoroughly, standing overnight, filtering the precipitate, and freeze drying the precipitate to obtain Glycyrrhiza polysaccharide.

A method for preparing glabridin and glycyrrhiza polysaccharide from glycyrrhiza glabra residues specifically comprises the following steps:

1. extraction: weighing a proper amount of glycyrrhiza glabra residues, adding 10-20 times of 80% -95% ethanol, and heating and refluxing for 2-3h at 70-75 ℃ in a continuous reflux extraction device to obtain a primary extract and glycyrrhiza glabra residues after primary extraction; discharging the primary extracting solution, and performing secondary extraction on the glycyrrhiza glabra residue after the primary extraction, wherein the secondary extraction process comprises the following steps: adding 10-20 times of 80% -95% ethanol into the primarily extracted glycyrrhiza glabra residue, and heating and refluxing at 70-75 deg.C for 2-3h to obtain secondary extractive solution and the rest glycyrrhiza glabra residue; mixing the primary extractive solution and the secondary extractive solution to obtain mixed extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

2. And (3) extraction: and (3) taking the concentrate (namely the paste) in the step (1), adding water with the weight being 20-30 times of that of the paste, stirring to dissolve (floccule, and stirring to suspend the floccule), adding ethyl acetate with the same volume, fully stirring, extracting (layering is realized, the solution is divided into an upper layer solution and a lower layer solution, the lower layer solution is a water layer, and the solution is used for the step (5)), taking the upper layer solution, and concentrating the upper layer solution to the paste at the temperature of 75 +/-2 ℃ to obtain an ethyl acetate part.

3. And (3) purification: selecting a macroporous resin packed column, roughly separating the ethyl acetate part, and comprising a primary purification step and a secondary purification step:

primary purification: adding 8-10 times of 95% ethanol (multiple refers to weight-volume ratio, 95% ethanol volume: ethyl acetate weight = 8-10: 1, for example, 8-10L 95% ethanol is added to 1kg ethyl acetate portion), dissolving (if insoluble matter exists, the ethanol addition is properly increased, if insoluble matter exists, filtering), loading, purifying the macroporous resin once 10-15 times (weight) the ethyl acetate portion, eluting with ethanol-water, 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol in sequence (when eluting, the volume of the eluting solvent is not required, monitoring by TLC, the ethanol concentration is low first and then high, namely, 10% ethanol is firstly dropped, then 20% ethanol is dropped, then 40% ethanol is dropped, then 60% ethanol is dropped, then 80% ethanol is dropped, finally, 95% ethanol is dripped, the elution rate has no specific requirement, one drop is connected with one drop, and no one-line flow is required), TLC thin-layer identification is adopted, the 60% ethanol fraction and the 80% ethanol fraction both contain glabridin, the 60% ethanol fraction and the 80% ethanol fraction are collected, the 60% ethanol fraction and the 80% ethanol fraction are combined, the reduced pressure concentration is carried out at the temperature of 70 +/-2 ℃, and the freeze drying is carried out, so that a sample A is obtained;

and (3) secondary purification: sampling A, adding 5-8 times of 95% ethanol (times refer to weight-volume ratio, 95% ethanol volume: sample A weight = 5-8: 1, for example, 1kg of sample A needs to be added with 5-8L 95% ethanol), dissolving (if insoluble substances exist, the ethanol addition is properly increased, if insoluble substances exist, filtering), loading, performing secondary purification, wherein the macroporous resin amount is 15-20 times (weight) of the sample A, the elution solvent is ethanol-water, and the ethanol is 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol in sequence (during elution, the volume of the elution solvent is not required, monitoring by TLC, the ethanol concentration is firstly low and then high, namely, firstly 20% ethanol is dropped, then 40% ethanol is dropped, then 60% ethanol is dropped, then 70% ethanol is dropped, then 80% ethanol is dropped, finally 95% ethanol is dropped, the elution rate is not specifically required, one drop is attached to another drop and the elution is not required to be in a line), TLC thin layer identification is utilized, the 70% ethanol fraction and the 80% ethanol fraction both contain glabridin, the 70% ethanol fraction and the 80% ethanol fraction are collected, the 70% ethanol fraction and the 80% ethanol fraction are combined, reduced pressure concentration is carried out at 70 +/-2 ℃, and freeze drying is carried out, so that the sample B is obtained. Liquid phase detection shows that the glabridin content is higher than 40%.

4. Refining: taking sample B, adding 5-8 times of methanol (multiple refers to weight-volume ratio, methanol volume: sample B weight = 5-8: 1, for example, 1kg of sample B needs to be added with 5-8L of methanol), dissolving (if insoluble matter exists, the adding amount of methanol is properly increased, if insoluble matter exists, filtering), separating by using a reverse phase chromatographic column, wherein the amount of a reverse phase silica gel filler is 15-20 times of the amount of sample B, an eluting solvent is methanol-water, and 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol are sequentially added (when eluting, the volume of the eluting solvent is not required, TLC is used for monitoring, the concentration of methanol is firstly low and then high, namely 20% methanol is firstly added, then 40% methanol is added, then 50% methanol is added, then 60% methanol is added, then 70% methanol is added, finally pure methanol is added, and the eluting rate is not specifically required, one drop after another without being aligned), identifying by TLC thin layer chromatography, collecting 60% methanol fraction and 70% methanol fraction containing glabridin, mixing 60% methanol fraction and 70% methanol fraction, concentrating under reduced pressure at 60 + -2 deg.C, and freeze drying to obtain sample C. Liquid phase detection shows that the glabridin content is higher than 90%.

The percentage of 20% methanol (methanol to water volume ratio of 20: 80), 40% methanol (methanol to water volume ratio of 40: 60), 50% methanol (methanol to water volume ratio of 50: 50), 60% methanol (methanol to water volume ratio of 60: 40), 70% methanol (methanol to water volume ratio of 70: 30) is by volume.

The macroporous resin and the reversed phase silica gel filler in the purification and refining steps can be repeatedly used for many times.

5. And (3) extraction of glycyrrhiza polysaccharide: taking the rest Glycyrrhiza glabra residue extracted in the step 1, adding water 20-30 times the weight of the rest Glycyrrhiza glabra residue, heating and refluxing at 90 + -5 deg.C for 2-3h, discharging liquid (primary water extract), performing secondary water extraction on the Glycyrrhiza glabra residue after the primary water extraction, combining the two water extracts, simultaneously combining the water layers extracted in the step 2, concentrating to 0.1-0.3 times the initial volume, adding active carbon 0.1-0.5% of the weight of the concentrated solution, heating at 70-80 deg.C for 50-70min, filtering, concentrating the filtrate to obtain a non-flowing paste, adding 95% ethanol 5-10 times the paste (the times are weight to volume ratio, 95% ethanol: paste weight =5-10:1, for example, paste is 1kg, and 95% ethanol is 5-10L), stirring thoroughly, standing overnight, filtering precipitate, and freeze drying to obtain Glycyrrhiza polysaccharide. And (3) detecting the content by using an ultraviolet-visible spectrophotometer, wherein the content of the glycyrrhiza polysaccharide is more than 60%.

Preferably, in the step 1), the ethanol content is 85-95%, and the amount is 10-15 times. In the step 2), the adding amount of water is 25-30 times of the paste. In the step 3), the primary purification macroporous resin is any one of AB-8, D-101, XAD-16, HPD-600 and H3520, and the secondary purification macroporous resin is any one of AB-8, D-101 and HPD-600. In the step 5), the extraction temperature of the first water extraction and the extraction temperature of the second water extraction are both 90-95 ℃, the extraction time is both 2.5h-3h, and the usage amount of the active carbon is 0.1-0.3% of the weight of the concentrated solution.

The raw material adopted in the invention, namely the glycyrrhiza glabra residue, is the glycyrrhiza glabra residue obtained by extracting glycyrrhizic acid from glycyrrhiza glabra, is the prior art and is not described any more. The raw material can be directly purchased commercially or made by oneself.

Compared with the prior art, the method has the advantages of clear flow, easy operation, low cost, and good color and high purity of the purified product. Meanwhile, the liquorice is utilized to the maximum extent, and waste is avoided.

Drawings

FIG. 1 is a liquid chromatogram of a glabridin reference;

FIG. 2 is a graph showing the results of liquid phase detection of sample B in example 1;

FIG. 3 is a graph showing the results of liquid phase detection of sample C in example 1;

FIG. 4 is a liquid phase detection result chart of Glycyrrhiza glabra residues.

Detailed Description

The present invention will be described in detail with reference to examples, but the present invention is not limited to the following specific examples.

FIG. 1 is a liquid chromatogram of glabridin reference, which is a liquid detection result of glabridin reference (the glabridin concentration in the reference is 0.1 mg/ml) for realizing the positioning of glabridin; FIG. 2 is a graph showing the results of liquid phase detection of sample B in example 1; FIG. 3 is a graph showing the results of liquid phase detection of sample C in example 1; FIG. 4 is a liquid phase detection result chart of Glycyrrhiza glabra residues, which illustrates that Glycyrrhiza glabra residues contain glabridin.

Example 1:

1. extraction: firstly, carrying out first extraction: weighing 10kg of Glycyrrhiza glabra residues, adding 10 times of 95% ethanol, heating and refluxing for 2h at 70 deg.C in a continuous reflux extraction device to obtain a primary extract and the first-extracted Glycyrrhiza glabra residues, and discharging the primary extract; and (3) carrying out secondary extraction on the glycyrrhiza glabra residues subjected to the primary extraction, wherein the secondary extraction process comprises the following steps: adding 10 times of 95% ethanol into the primarily extracted glycyrrhiza glabra residue, and heating and refluxing at 70 deg.C for 2h to obtain secondary extractive solution and the rest glycyrrhiza glabra residue; mixing the primary extractive solution and the secondary extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

2. And (3) extraction: and (3) taking the concentrate obtained in the step (1), adding water with the weight accounting for 25 times of that of the paste, stirring to dissolve the concentrate (floccule, and stirring to suspend the floccule), adding ethyl acetate with the same volume, fully stirring and extracting, taking the upper layer solution, and concentrating the upper layer solution at the temperature of 75 +/-2 ℃ to form a paste to obtain an ethyl acetate part.

3. And (3) purification: selecting a D-101 macroporous resin packed column (both the primary purification macroporous resin and the secondary purification macroporous resin are D-101, and the D-101 macroporous resin packed column is adopted in the two purifications), and roughly separating the ethyl acetate part;

primary purification: adding 10 times of 95% ethanol into ethyl acetate part, dissolving (containing a very small amount of insoluble substances, filtering), loading, wherein the D-101 macroporous resin amount is 10 times (by weight) of the ethyl acetate part, the eluting solvent is ethanol-water, and the D-101 macroporous resin amount is 10 times of the ethyl acetate part, the eluting solvent is 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol (the volumes of 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol are respectively 2 column volumes, 3 column volumes and 5 column volumes, the flow rate in the eluting process is 3.6 ml/min), identifying by TLC thin layer, collecting 60% ethanol fraction and 80% ethanol fraction, mixing, concentrating under reduced pressure at 70 + -2 deg.C, freeze drying, obtaining a sample A;

and (3) secondary purification: sampling a sample A, adding 8 times of 95% ethanol, dissolving, loading, wherein the amount of D-101 macroporous resin is 15 times (by weight) of the amount of the sample A, the eluting solvent is ethanol-water, the volume ratios of 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol (the volume ratios of 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol are respectively 1 column volume, 2 column volumes, 3 column volumes and 4 column volumes, the flow rates in the eluting process are all 3.0 ml/min), identifying by using a TLC thin layer, wherein 70% ethanol fraction and 80% ethanol fraction both contain glabridin, collecting 70% ethanol fraction and 80% ethanol fraction, combining, concentrating under reduced pressure at 70 +/-2 ℃, and freeze drying to obtain a sample B. Liquid phase detection shows that the content of glabridin is 46%, the weight is 201g, and the extraction rate is 90%.

4. Refining: taking a sample B, adding 5 times of methanol, dissolving (containing a very small amount of insoluble substances, filtering), separating by using a reverse phase chromatographic column, wherein the amount of a reverse phase silica gel filler is 15 times of that of the sample B, an elution solvent is methanol-water, and the volumes of 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol (20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol are respectively 1 column volume, 2 column volumes, 4 column volumes and 5 column volumes, the flow rate in the elution process is 2.4 ml/min), identifying by using a TLC thin layer, wherein the 60% methanol fraction and the 70% methanol fraction both contain glabridin, collecting the 60% methanol fraction and the 70% methanol fraction, combining, concentrating under reduced pressure at 60 +/-2 ℃, freezing and drying to obtain a sample C. Liquid phase detection shows that the glabridin content is 92%, the weight is 90g, and the extraction rate is 90%.

5. And (3) extraction of glycyrrhiza polysaccharide: carrying out first water extraction: taking the residual glycyrrhiza glabra residues extracted in the step 1, adding water which is 20 times of the weight of the residual glycyrrhiza glabra residues, heating and refluxing for 2.5 hours at 95 ℃ to obtain a primary water extract and the glycyrrhiza glabra residues subjected to primary water extraction, and discharging liquid (the primary water extract); and carrying out water extraction for the second time, wherein the water extraction process for the second time comprises the following steps: adding water 20 times the weight of the glycyrrhiza glabra residue obtained after the first water extraction, and heating and refluxing for 2.5h at 95 ℃ to obtain a secondary water extract and glycyrrhiza glabra residue obtained after the second water extraction; mixing the primary and secondary water extracts, mixing the water layers extracted in step 2, concentrating to 0.1 times of the original volume, adding activated carbon 0.1% of the weight of the solution (i.e. concentrated solution), heating at 70 deg.C for 70min, filtering, concentrating the filtrate to a non-flowing paste, adding 95% ethanol 5 times of the paste, stirring, standing overnight, filtering the precipitate, and freeze drying the precipitate to obtain Glycyrrhiza polysaccharide 1420. And (4) detecting the content by using an ultraviolet-visible spectrophotometer, wherein the content of the glycyrrhiza polysaccharide is 65%.

Example 2:

1. extraction: firstly, carrying out first extraction: weighing 10kg of Glycyrrhiza glabra residues, adding 90% ethanol 12 times of the weight of the Glycyrrhiza glabra residues, heating and refluxing for 2.5h at 73 ℃ in a continuous reflux extraction device to obtain a primary extract and the Glycyrrhiza glabra residues after primary extraction, and discharging the primary extract; and (3) carrying out secondary extraction on the glycyrrhiza glabra residues subjected to the primary extraction, wherein the secondary extraction process comprises the following steps: adding 90% ethanol 12 times the amount of the residue of Glycyrrhiza glabra Linne after the primary extraction, and heating and refluxing at 73 deg.C for 2.5h to obtain secondary extractive solution and the residue of Glycyrrhiza glabra Linne; mixing the primary extractive solution and the secondary extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

2. And (3) extraction: and (3) taking the concentrate in the step (1), adding water with the weight accounting for 30 times of that of the paste, stirring to dissolve the concentrate (floccule, and stirring to suspend the floccule), adding ethyl acetate with the same volume, fully stirring and extracting, taking the upper layer solution, and concentrating the upper layer solution at the temperature of 75 +/-2 ℃ to form a paste to obtain an ethyl acetate part.

3. And (3) purification: selecting an AB-8 macroporous resin packed column, roughly dividing the ethyl acetate part: adding 8 times of 95% ethanol into the ethyl acetate part, dissolving (containing a very small amount of insoluble substances, filtering), loading, wherein the amount of the AB-8 macroporous resin is 13 times (by weight) of the amount of the ethyl acetate part, the eluting solvent is ethanol-water, the proportions of 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol (the volumes are respectively 2 column volumes, 2.5 column volumes, 3 column volumes, 3.5 column volumes and 5 column volumes, and the flow rate is 3.4 ml/min), identifying by TLC thin layer, collecting 60% ethanol fraction and 80% ethanol fraction, mixing, concentrating at 70 +/-2 ℃, and freeze-drying to obtain a sample A; sampling a sample A, adding 8 times of 95% ethanol, dissolving, and loading, wherein the amount of the AB-8 macroporous resin is 18 times (by weight) of the amount of the sample A, the eluting solvent is ethanol-water, the proportions are 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol (the volumes are respectively 1 column volume, 2 column volumes, 4 column volumes and 4 column volumes, and the flow rate is 3.0 ml/min), identifying by TLC thin layer, wherein the 70% ethanol fraction and the 80% ethanol fraction both contain glabridin, collecting the 70% ethanol fraction and the 80% ethanol fraction, combining, concentrating under reduced pressure at 70 +/-2 ℃, and freeze-drying to obtain a sample B. Liquid phase detection shows that the content of glabridin is 48%, the weight is 190g, and the extraction rate is 91%.

4. Refining: and (2) taking a sample B, adding 8 times of methanol, dissolving (containing a very small amount of insoluble substances, filtering), separating by using a reverse phase chromatographic column, wherein the amount of a reverse phase silica gel filler is 18 times that of the sample B, an elution solvent is methanol-water, and sequentially comprises 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol (the volumes are respectively 1 column volume, 2 column volumes, 1 column volume, 5 column volumes and 5 column volumes, and the flow rate is 2.4 ml/min), identifying by using a TLC (thin layer chromatography), wherein the 60% methanol fraction and the 70% methanol fraction both contain glabridin, collecting the 60% methanol fraction and the 70% methanol fraction, combining, concentrating under reduced pressure at 60 +/-2 ℃, and freeze drying to obtain a sample C. Liquid phase detection shows that the glabridin content is 91%, the weight is 90g, and the extraction rate is 89%.

5. And (3) extraction of glycyrrhiza polysaccharide: carrying out first water extraction: taking the residual glycyrrhiza glabra residues extracted in the step 1, adding water which is 30 times of the weight of the residual glycyrrhiza glabra residues, heating and refluxing for 3 hours at 90 ℃ to obtain a primary water extract and the glycyrrhiza glabra residues subjected to primary water extraction, discharging liquid (the primary water extract), and performing secondary water extraction, wherein the process of the secondary water extraction is as follows: adding water 30 times the weight of the glycyrrhiza glabra residue obtained after the first water extraction, and heating and refluxing for 3h at 90 ℃ to obtain a secondary water extract and glycyrrhiza glabra residue obtained after the second water extraction; and (3) combining the primary water extract and the secondary water extract, combining the water layers extracted in the step (2), concentrating to 0.2 time of the initial volume, adding activated carbon accounting for 0.2% of the weight of the solution (namely the concentrated solution), heating at 75 ℃ for 60min, filtering, concentrating the filtrate to a non-flowing paste, adding 95% ethanol accounting for 8 times of the paste, fully stirring, standing overnight, filtering precipitates, and freeze-drying to obtain 1470g of glycyrrhiza polysaccharide. And (4) detecting the content by using an ultraviolet-visible spectrophotometer, wherein the content of the glycyrrhiza polysaccharide is 63%.

Example 3:

1. extraction: weighing 10kg of Glycyrrhiza glabra residues, adding 15 times of 85% ethanol, heating and refluxing for 3h at 75 deg.C in a continuous reflux extraction device to obtain a primary extract and the first-extracted Glycyrrhiza glabra residues, and discharging the primary extract, which is the first extraction process; and carrying out secondary extraction on the glycyrrhiza glabra residues subjected to the primary extraction, wherein the secondary extraction process comprises the following steps: adding 15 times of 85% ethanol into the primarily extracted glycyrrhiza glabra residue, and heating and refluxing at 75 deg.C for 3h to obtain secondary extractive solution and the rest glycyrrhiza glabra residue; mixing the primary extractive solution and the secondary extractive solution, and concentrating at 75 + -2 deg.C to obtain paste.

2. And (3) extraction: and (3) taking the concentrate in the step (1), adding 28 times of water with the weight of the paste, stirring to dissolve the concentrate (floccule, and stirring to suspend the floccule), adding the ethyl acetate with the same volume, fully stirring, extracting, taking the upper layer solution, and concentrating the upper layer solution at the temperature of 75 +/-2 ℃ to form a paste to obtain an ethyl acetate part.

3. And (3) purification: selecting an HPD-60 macroporous resin packed column, roughly dividing the ethyl acetate part: adding 8 times of 95% ethanol into the ethyl acetate part, dissolving (containing a very small amount of insoluble substances, filtering), loading, wherein the HPD-60 macroporous resin amount is 15 times (by weight) of the ethyl acetate part, the eluting solvent is ethanol-water, the proportions are 10% ethanol, 20% ethanol, 40% ethanol, 60% ethanol, 80% ethanol and 95% ethanol (the volumes are respectively 1 column volume, 2 column volumes, 4 column volumes and 5 column volumes, the flow rate is 4.0 ml/min), identifying by TLC (thin layer chromatography), collecting 60% ethanol fraction and 80% ethanol fraction, mixing, concentrating at 70 +/-2 ℃, and freeze-drying to obtain a sample A; sampling a sample A, adding 8 times of 95% ethanol, dissolving, loading, wherein the amount of HPD-60 macroporous resin is 20 times (weight) of the sample A, the eluting solvent is ethanol-water, the proportions are 20% ethanol, 40% ethanol, 60% ethanol, 70% ethanol, 80% ethanol and 95% ethanol (the volumes are respectively 1.5 column volume, 2 column volume, 2.5 column volume, 4 column volume and 4 column volume, the flow rate is 3.6 ml/min), identifying by TLC thin layer, wherein 70% ethanol fraction and 80% ethanol fraction both contain glabridin, collecting 70% ethanol fraction and 80% ethanol fraction, combining, concentrating at 70 +/-2 ℃, and freeze drying to obtain a sample B. Liquid phase detection shows that the content of glabridin is 45%, the weight is 195g, and the extraction rate is 88%.

4. Refining: and (2) taking a sample B, adding 8 times of methanol, dissolving (containing a very small amount of insoluble substances, filtering), separating by using a reverse phase chromatographic column, wherein the amount of a reverse phase silica gel filler is 20 times that of the sample B, an elution solvent is methanol-water, and sequentially comprises 20% methanol, 40% methanol, 50% methanol, 60% methanol, 70% methanol and pure methanol (the volumes are respectively 1 column volume, 2 column volumes, 3.5 column volumes and 5 column volumes, and the flow rate is 2.0 ml/min), identifying by using a TLC (thin layer chromatography), wherein the 60% methanol fraction and the 70% methanol fraction both contain glabridin, collecting the 60% methanol fraction and the 70% methanol fraction, combining, concentrating under reduced pressure at 60 +/-2 ℃, and freeze drying to obtain a sample C. Liquid phase detection shows that the glabridin content is 92%, the weight is 83g, and the extraction rate is 87%.

5. And (3) extraction of glycyrrhiza polysaccharide: and (2) taking the residual glycyrrhiza glabra residues extracted in the step (1), adding water which is 20 times of the weight of the residual glycyrrhiza glabra residues, heating and refluxing for 170min at 93 ℃ to obtain a primary water extract and the glycyrrhiza glabra residues subjected to primary water extraction, and discharging liquid (the primary water extract), wherein the primary water extraction process is carried out. And then carrying out water extraction for the second time: adding water 20 times the weight of the residue into the residue, and heating and refluxing at 93 deg.C for 170min to obtain secondary water extract and residue; and (3) combining the primary water extract and the secondary water extract, combining the water layers extracted in the step (2), concentrating to 0.2 time of the initial volume, adding activated carbon accounting for 0.3% of the weight of the solution (namely the concentrated solution), heating for 50min at 80 ℃, filtering, concentrating the filtrate to a non-flowing paste, adding 95% ethanol accounting for 10 times of the paste, fully stirring, standing overnight, filtering precipitates, and freeze-drying to obtain 1440g of the glycyrrhiza polysaccharide. The content of the glycyrrhiza polysaccharide is 65 percent by using an ultraviolet-visible spectrophotometer for content detection.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.