CN110845558A - Astilbin prepared from Engelhardtia chrysolepis Hance leaf and its preparation method - Google Patents
Astilbin prepared from Engelhardtia chrysolepis Hance leaf and its preparation method Download PDFInfo
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Abstract
The invention discloses astilbin prepared by taking engelhardtia leaves as a raw material and a preparation method thereof, wherein the method comprises the following steps: crushing Engelhardtia roxburghiana leaves into fragments, performing multiple micro-boiling reflux extraction with ethyl acetate, and combining the extracting solutions; recovering ethyl acetate from the extractive solution, adding deionized water, removing residual ethyl acetate from the extractive solution, crystallizing for the first time, and filtering to obtain crude product; dissolving the crude product with ethanol, adding activated carbon powder, stirring, and filtering to obtain filtrate; passing the filtrate through macroporous adsorbent resin column, and eluting with ethanol to obtain effluent; and adding ethyl acetate into the effluent, uniformly stirring, standing, taking supernatant, adding deionized water into the supernatant, sequentially concentrating, crystallizing for the second time, filtering to obtain crystals, washing, and drying in vacuum to obtain the product. The method provided by the invention obviously improves the extraction rate and the product purity of astilbin; realizes the purpose of extracting astilbin with low cost, high speed and high efficiency, and can be used for mass production in factories.
Description
Technical Field
The invention relates to the technical field of extraction of active ingredients of natural products, and in particular relates to astilbin prepared from engelhardtia roxburghiana leaves as a raw material and a preparation method thereof.
Background
The Engelhardia roxburghi-ana Wall leaf is dried leaf of Engelhardia roxburghi (Engelhardia roxburghi-ana Wall) belonging to Engelhardia of Juglandaceae, and is mainly distributed in Guangdong, Guangxi, Yunnan, Fujian, etc., with abundant resource. In Guangxi province, the engelhardtia leaves are also called as arhat tea, which has the effects of clearing away heat and toxic materials, promoting the production of body fluid to quench thirst and relieving summer-heat, and can eliminate summer-heat, indigestion and abdominal pain. The flavanone such as astilbin, taxifolin and engelhardoside is the main active ingredient in engelhardtia leaves, wherein the content of astilbin is the highest. Modern researches show that astilbin can reduce cholesterol, protect liver and has the effects of relieving labor pain and edema; astilbin also has various biological activities such as selective immunosuppression.
Astilbin has various obvious biological activities including inhibition of coenzyme A reductase, inhibition of aldose reductase, liver protection, analgesia, edema resistance and the like. In recent years, astilbin has been reported to have a remarkable selective immunosuppressive effect, and the selective effect of astilbin has obvious advantages compared with the prior immunosuppressive agent, so that astilbin can be used as a novel immunosuppressive agent for treating immune-related diseases.
At present, the problems of low utilization rate, low purity of prepared products, complex technical process, difficulty in realizing industrial production and the like generally exist in the extraction technology of the astilbin of engelhardtia roxburghiana leaves.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a method for preparing astilbin from engelhardtia roxburghiana leaves, so as to solve the problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for preparing astilbin from Engelhardtia roxburghiana leaves comprises the following steps:
1) crushing raw material engelhardtia leaves into fragments, carrying out multiple micro-boiling reflux extraction with ethyl acetate, and combining extracting solutions;
2) recovering ethyl acetate in the extract, adding deionized water, removing residual ethyl acetate in the extract to obtain water phase, crystallizing for the first time, and filtering to obtain crude product;
3) dissolving the crude product obtained in the step 2) by using ethanol, adding activated carbon powder, stirring and filtering to obtain filtrate;
4) enabling the filtrate obtained in the step 3) to pass through a macroporous adsorption resin column, and then eluting with ethanol to obtain an effluent liquid;
5) adding ethyl acetate into the effluent, uniformly stirring, standing, taking supernatant, adding deionized water into the supernatant, sequentially concentrating, crystallizing for the second time, filtering to obtain crystals, washing, and vacuum drying to obtain the product.
Preferably, in the step 1), the fragments are 1-2 mm; the times of micro-boiling reflux extraction are 3, and the feed-liquid ratio of the engelhardtia leaves to the ethyl acetate is 1g: 5-6 ml; the extraction time is 1.5-2.5 hours.
Preferably, in the step 2), the addition amount of the deionized water is not more than 1.5 times of the weight of the engelhardtia leaves; the temperature of the first crystallization is 4-8 ℃, and the time is 7-8 hours.
Preferably, in the step 3), the mass volume ratio of the crude product to the ethanol is 1g: 5-7 ml, and the volume fraction of the ethanol is 50%.
Preferably, in the step 3), before adding the activated carbon powder, heating the solution in which the crude product is dissolved to 60-65 ℃ in a water bath.
Preferably, in the step 3), the mass ratio of the activated carbon powder to the crude product is 2.5-3.5: 100; the stirring time is 3-5 minutes.
Preferably, in the step 4), the macroporous adsorption resin column comprises D101, AB-8 and DA 201; the speed of the filtrate passing through a macroporous adsorption resin column is 1.2-1.5 Bv/h; the elution amount of the ethanol is 1.5-2 Bv, and the elution rate is 1.5-2 Bv/h.
Preferably, in the step 5), the volume ratio of the effluent liquid to the ethyl acetate is 10: 3; the volume ratio of the deionized water to the ethyl acetate is 1: 10; the concentration is specifically vacuum concentration to recover ethyl acetate.
Preferably, in the step 5), the temperature of the second crystallization is 4-8 ℃, and the time is 4-5 hours; the washing is to wash and filter crystals by cold water at 5-15 ℃; the vacuum drying condition is that the vacuum degree is between-0.08 and-0.1 MPa, and the temperature is set to be 60 to 65 ℃.
Preferably, the method comprises the steps of:
1) crushing raw material engelhardtia leaves into 1-2 mm fragments, performing 3-microboiling reflux extraction with ethyl acetate 5 times of the raw material for 1.5 hours each time, and combining extracting solutions;
2) recovering ethyl acetate in the extract, adding deionized water which is not higher than 1.5 of the raw material, removing the residual ethyl acetate in the extract to form a water phase, crystallizing at the temperature of 4-8 ℃ for 7-8 hours, and filtering to obtain a crude product;
3) dissolving the crude product with 50% ethanol in an amount which is 6 times that of the crude product, heating the solution in a water bath to 60-65 ℃, adding activated carbon powder in an amount which is 3% of the weight of the crude product, stirring the solution for 3-5 minutes, and filtering the solution to obtain a filtrate;
4) enabling the obtained filtrate to pass through macroporous adsorption resin at the speed of 1.2-1.5 Bv/h, and then eluting with 1.5Bv 50% ethanol at the speed of 1.5-2 Bv/h to obtain an effluent liquid;
5) adding ethyl acetate into the effluent according to the volume ratio of the effluent to the ethyl acetate of 10:3, uniformly stirring, standing, taking supernatant, adding one tenth of deionized water of the ethyl acetate into the supernatant, vacuum concentrating, recovering the ethyl acetate, crystallizing for 4-5 hours at the temperature of 4-8 ℃, filtering to obtain crystals, washing the crystals with cold water at the temperature of 5-15 ℃, and finally vacuum drying to obtain the product.
The invention also provides astilbin prepared by any one of the methods.
The invention has the beneficial effects that:
the method mainly extracts and purifies the astilbin by the modes of ethyl acetate extraction, activated carbon impurity removal, macroporous adsorption resin impurity removal, low-temperature crystallization and extraction, and reduces loss as much as possible, so that the extraction yield of the astilbin can reach over 75 percent, and the purity of the astilbin can reach over 95 percent; the extraction rate and the product purity of astilbin are obviously improved; realizes the purpose of extracting astilbin with low cost, high speed and high efficiency, and can be used for mass production in factories.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) crushing 500KG raw materials of dry engelhardtia leaves into 1-2 mm fragments; adding 2500L ethyl acetate, boiling, reflux-extracting for 3 times (each for 1.5 hr), and mixing extractive solutions;
(2) recovering ethyl acetate in the extracting solution, adding 500L of deionized water, removing the residual ethyl acetate in the extracting solution to form a water phase, carrying out first-step crystallization at the temperature of 5 ℃, wherein the crystallization time is 8h, and filtering to obtain a crude product with the wet weight of about 70 KG;
(3) dissolving the crude product with 420L 50% ethanol, heating to 65 deg.C in water bath, adding 2.1KG activated carbon powder, stirring for 3 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3Controlling the flow rate of an AB-8 resin column at 1200L/h, and washing the column with 1500L 50% ethanol at the flow rate of 1.5Bv/h to obtain an effluent 1920L;
(5) adding 576L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 57.6L deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 5 deg.C for 4h, filtering, washing crystal with 20L cold water at 5 deg.C, and drying at-0.09 MPa and 65 deg.C to obtain product of about 30KG, with astilbin content and yield as shown in Table 1 below.
Example 2
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) crushing 500KG raw materials of dry engelhardtia leaves into 1-2 mm fragments; adding 3000L ethyl acetate, boiling under reflux for 3 times, each for 2 hr, and mixing extractive solutions;
(2) recovering ethyl acetate in the extracting solution, adding 600L of deionized water, removing the residual ethyl acetate in the extracting solution to form a water phase, carrying out first-step crystallization at the temperature of 6 ℃, wherein the crystallization time is 7 hours, and filtering to obtain a crude product with the wet weight of about 70 KG;
(3) dissolving the crude product with 500L 50% ethanol, heating in water bath to 60 deg.C, adding 2KG activated carbon powder, stirring for 5 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3D101 resin column, flow rate is controlled at 1300L/h, 1500L 50% ethanol is used for washing the column with flow rate of 1.7Bv/h, and effluent liquid 2000L is obtained;
(5) adding 600L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 60L of deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 6 deg.C for 5h, filtering, washing the crystal with 20L of cold water 10 deg.C during filtering, and completely drying the washed crystal at vacuum degree of-0.08 MPa and temperature of 62 deg.C to obtain product of about 30KG, whose astilbin content and yield are shown in Table 1 below.
Example 3
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) crushing 500KG raw materials of dry engelhardtia leaves into 1-2 mm fragments; adding 2800L ethyl acetate, boiling under reflux for 3 times, each for 2.5 hr, and mixing extractive solutions;
(2) recovering ethyl acetate from the extractive solution, adding 550L deionized water, removing residual ethyl acetate from the extractive solution to obtain water phase, crystallizing at 7 deg.C for 6 hr, and filtering to obtain crude product with wet weight of about 70 KG;
(3) dissolving the crude product with 480L 50% ethanol, heating in water bath to 62 deg.C, adding 2.4KG activated carbon powder, stirring for 4 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3Controlling AB-8 resin column flow rate at 1500L/h, washing column with 1500L 50% ethanol at 2.0Bv/h to obtain effluent 1980L；
(5) Adding 594L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 59.4L deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 7 deg.C for 4.5h, filtering, washing crystal with 20L cold water of 15 deg.C, and drying at-0.1 MPa and 63 deg.C to obtain product of about 30KG, with astilbin content and yield as shown in Table 1 below.
Comparative example 1
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) crushing 500KG raw materials of dry Engelhardtia roxburghiana leaves into 1-2 mm fragments; adding 2500L 80% ethanol solution, boiling under reflux for 3 times, each for 1.5 hr, and mixing extractive solutions;
(2) recovering ethanol from the extract, adding 100L of deionized water, removing residual ethanol to obtain water phase, performing first-step crystallization at 5 deg.C for 8 hr, filtering to obtain crude product with wet weight of about 60 KG;
(3) dissolving the crude product with 420L 50% ethanol, heating to 65 deg.C in water bath, adding 2.1KG activated carbon powder, stirring for 3 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3Controlling the flow rate of an AB-8 resin column at 1200L/h, and washing the column with 1500L 50% ethanol at the flow rate of 1.5Bv/h to obtain an effluent 1920L;
(5) adding 576L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 57.6L deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 5 deg.C for 4 hr, filtering, washing crystal with 20L cold water at 5 deg.C, and drying at vacuum degree of-0.09 MPa and temperature of 64 deg.C to obtain product of about 25KG, with astilbin content and yield as shown in Table 1 below.
Comparative example 2
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) crushing 500KG raw materials of dry Engelhardtia roxburghiana leaves into 1-2 mm fragments; adding 5000L ethyl acetate, and leaching at room temperature for 8 hr to obtain extractive solution;
(2) recovering ethyl acetate from the extracting solution, adding 500L of deionized water, removing residual ethyl acetate to form a water phase, carrying out first-step crystallization at the temperature of 5 ℃, wherein the crystallization time is 8 hours, and filtering to obtain a crude product with the wet weight of about 50 KG;
(3) dissolving the crude product with 350L 50% ethanol, heating in water bath to 65 deg.C, adding 2KG activated carbon powder, stirring for 3 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3Controlling the flow rate of AB-8 resin column at 1200L/h, washing column with 1500L 50% ethanol at 1.5Bv/h to obtain effluent 1850L;
(5) adding 555L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 55L of deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 5 deg.C for 4h, filtering, washing the crystal with 20L of 5 deg.C cold water, and drying at-0.09 MPa and 65 deg.C to obtain product of about 18KG, with astilbin content and yield as shown in Table 1 below.
Comparative example 3
The method for preparing astilbin by taking engelhardtia leaves as raw materials comprises the following steps:
(1) adding 5000L ethyl acetate into 500KG raw material of Engelhardtia chrysolepis Hance leaf, extracting under reflux for 3 times each for 1.5 hr, and mixing extractive solutions;
(2) recovering ethyl acetate from the extracting solution, adding 500L of deionized water, removing residual ethyl acetate to form a water phase, carrying out first-step crystallization at the temperature of 5 ℃, wherein the crystallization time is 8 hours, and filtering to obtain a crude product with the wet weight of about 50 KG;
(3) dissolving the crude product with 350L 50% ethanol, heating in water bath to 65 deg.C, adding 2KG activated carbon powder, stirring for 3 min, and filtering to obtain filtrate;
(4) filtering the filtrate for 1m3AB-8 resin column, flow rate is controlled at 1200L/h, 1500L 50% ethanol is usedWashing the column at a flow rate of 1.5Bv/h to obtain 1850L of effluent;
(5) adding 550L of ethyl acetate according to the volume ratio of the effluent liquid to the ethyl acetate of 10:3, fully stirring, standing, and taking supernatant ethyl acetate; adding 55L of deionized water into ethyl acetate, vacuum concentrating to recover ethyl acetate, crystallizing at 5 deg.C for 4h, filtering, washing the crystal with 20L of 5 deg.C cold water, and drying at-0.08 MPa and 65 deg.C to obtain 20KG product with astilbin content and yield as shown in Table 1 below.
The results of the assay of the products obtained in examples 1 to 3 and comparative examples 1 to 3 are shown in Table 1 below, wherein the astilbin content was measured by high performance liquid chromatography, and the astilbin yield was calculated according to the following formula:
astilbin yield (%) - (weight of product (KG) × astilbin content in product (%)/(weight of raw material (KG) × astilbin content in raw material (%)) × 100%
TABLE 1 parameters of the starting materials and of the products obtained for the different examples and comparative examples
As can be seen from Table 1, compared with example 1, in the case of the proportion 1, the method for extracting the engelhardtia roxburghiana leaves by refluxing with the high-purity ethanol increases the dissolution of the weak polar substances, increases the pressure of subsequent activated carbon removal and macroporous resin adsorption column chromatography, and causes the obtained product to have yellow color, the astilbin content in the product is only more than 80%, the yield is more than 50%, and the content and the yield are both lower.
Compared with the example 1, the method selects ethyl acetate to leach the engelhardtia leaves at room temperature, so that the astilbin content of the product is more than 90 percent, the yield is only more than 40 percent, the ideal yield cannot be achieved, and the efficiency is low.
Compared with the example 1, the whole leaves of the engelhardtia roxburghiana leaves are selected as the raw material, the leaves are not broken, so that the occupied space of the raw material is enlarged, the extracted solvent is greatly increased, the content of astilbin of the product is more than 90 percent, the yield is only more than 40 percent, and the yield is low.
Compared with the comparative examples 1-3, the method provided by the invention has the advantages that the extraction yield of the obtained astilbin product can reach more than 75%, the purity can reach more than 95%, and the extraction yield and the product purity of the astilbin are obviously improved; realizes the purpose of extracting astilbin with low cost, high speed and high efficiency, and can be used for mass production in factories.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for preparing astilbin by taking engelhardtia leaves as a raw material is characterized by comprising the following steps:
1) crushing raw material engelhardtia leaves into fragments, carrying out multiple micro-boiling reflux extraction with ethyl acetate, and combining extracting solutions;
2) recovering ethyl acetate in the extract, adding deionized water, removing residual ethyl acetate in the extract to obtain water phase, crystallizing for the first time, and filtering to obtain crude product;
3) dissolving the crude product obtained in the step 2) by using ethanol, adding activated carbon powder, stirring and filtering to obtain filtrate;
4) enabling the filtrate obtained in the step 3) to pass through a macroporous adsorption resin column, and then eluting with ethanol to obtain an effluent liquid;
5) adding ethyl acetate into the effluent, uniformly stirring, standing, taking supernatant, adding deionized water into the supernatant, sequentially concentrating, crystallizing for the second time, filtering to obtain crystals, washing, and vacuum drying to obtain the product.
2. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein in the step 1), the fragments are 1-2 mm; the times of micro-boiling reflux extraction are 3, and the feed-liquid ratio of the engelhardtia leaves to the ethyl acetate is 1g: 5-6 ml; the extraction time is 1.5-2.5 hours.
3. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein the deionized water is added in an amount of not more than 1.5 times the weight of the engelhardtia leaves in the step 2); the temperature of the first crystallization is 4-8 ℃, and the time is 7-8 hours.
4. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein in the step 3), the mass volume ratio of the crude product to the ethanol is 1g: 5-7 ml, and the volume fraction of the ethanol is 50%.
5. The method for preparing astilbin from engelhardtia leaves as raw material according to claim 1, wherein in the step 3), before adding the activated carbon powder, the method further comprises heating the solution after dissolving the crude product to 60-65 ℃ in water bath; the mass ratio of the activated carbon powder to the crude product is 2.5-3.5: 100; the stirring time is 3-5 minutes.
6. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein in the step 4), the macroporous adsorption resin column comprises D101, AB-8 and DA 201; the speed of the filtrate passing through a macroporous adsorption resin column is 1.2-1.5 Bv/h; the elution amount of the ethanol is 1.5-2 Bv, and the elution rate is 1.5-2 Bv/h.
7. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein in the step 5), the volume ratio of the effluent liquid to the ethyl acetate is 10: 3; the volume ratio of the deionized water to the ethyl acetate is 1: 10; the concentration is specifically vacuum concentration to recover ethyl acetate.
8. The method for preparing astilbin by taking engelhardtia leaves as a raw material according to claim 1, wherein in the step 5), the temperature of the second crystallization is 4-8 ℃ and the time is 4-5 hours; the washing is to wash and filter crystals by cold water at 5-15 ℃; the vacuum drying condition is that the vacuum degree is between-0.08 and-0.1 MPa, and the temperature is set to be 60 to 65 ℃.
9. The method for preparing astilbin from engelhardtia leaves as raw material according to claim 1, characterized in that the method comprises the following steps:
1) crushing raw material engelhardtia leaves into 1-2 mm fragments, performing 3-microboiling reflux extraction with ethyl acetate 5 times of the raw material for 1.5 hours each time, and combining extracting solutions;
2) recovering ethyl acetate in the extract, adding deionized water which is not higher than 1.5 of the raw material, removing the residual ethyl acetate in the extract to form a water phase, crystallizing at the temperature of 4-8 ℃ for 7-8 hours, and filtering to obtain a crude product;
3) dissolving the crude product with 50% ethanol in an amount which is 6 times that of the crude product, heating the solution in a water bath to 60-65 ℃, adding activated carbon powder in an amount which is 3% of the weight of the crude product, stirring the solution for 3-5 minutes, and filtering the solution to obtain a filtrate;
4) enabling the obtained filtrate to pass through macroporous adsorption resin at the speed of 1.2-1.5 Bv/h, and then eluting with 1.5Bv 50% ethanol at the speed of 1.5-2 Bv/h to obtain an effluent liquid;
5) adding ethyl acetate into the effluent according to the volume ratio of the effluent to the ethyl acetate of 10:3, uniformly stirring, standing, taking supernatant, adding one tenth of deionized water of the ethyl acetate into the supernatant, vacuum concentrating, recovering the ethyl acetate, crystallizing for 4-5 hours at the temperature of 4-8 ℃, filtering to obtain crystals, washing the crystals with cold water at the temperature of 5-15 ℃, and finally vacuum drying to obtain the product.
10. Astilbin prepared by the method according to any one of claims 1 to 9.
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| CN100348606C (en) * | 2005-07-08 | 2007-11-14 | 南京大学 | Preparation method of astilbin |
| CN100348610C (en) * | 2005-09-01 | 2007-11-14 | 桂林莱茵生物科技股份有限公司 | Method for extracting astilbin from engelhardtia leaves |
| CN101054369A (en) * | 2007-06-05 | 2007-10-17 | 宋云飞 | Method for extracting and separating dihydroquercetin from engelhardtia leaves |
| CN107056858A (en) * | 2017-04-28 | 2017-08-18 | 南宁馨艺荣生物科技有限公司 | Process for extracting astilbin from engelhardtia leaves |
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Application publication date: 20200228 |