阅读说明：本技术 一种生姜提取姜辣素的方法 (Method for extracting gingerol from ginger ) 是由 廖钦洪 张文林 唐建民 李哲馨 李洪雷 于 2021-10-14 设计创作，主要内容包括：一种生姜提取姜辣素的方法是以生姜为原料,蒙脱石,羟丙甲纤维素为辅料,依次进行干燥粉碎收集干姜粉、干姜粉与夹带剂混合、二氧化碳超临界萃取、萃取后处理等步骤实现；所述夹带剂为甲醇、乙醇、丙酮、乙醚、正己烷中的一种或多种。本发明可使得标记成分姜辣素的提取转移率大幅度提高,标记成分6-姜辣素的转移率可高达64.3%,萃取后处理过程,由于有蒙脱石的吸附和羟丙甲纤维素的粘度调节作用,使得姜辣素挥发性成分损失较少,保存过程稳定性好,在极端环境保存30天,本发明产品性状几乎无变化,标记成分6-姜辣素的含量下降较小,仅仅下降0.021%,本发明方产品可直接作为食品、药品、化妆品的功能性添加物直接添加,使用方便,值得市场推广。(A method for extracting gingerol from rhizoma Zingiberis recens comprises drying rhizoma Zingiberis recens as raw material, montmorillonite and hypromellose as adjuvants, pulverizing, collecting dry rhizoma Zingiberis recens powder, mixing dry rhizoma Zingiberis recens powder with entrainer, performing carbon dioxide supercritical extraction, and performing post-extraction treatment; the entrainer is one or more of methanol, ethanol, acetone, diethyl ether and n-hexane. The invention can greatly improve the extraction transfer rate of the labeled component gingerol, the transfer rate of the labeled component 6-gingerol can reach 64.3 percent, the volatile component of gingerol is less lost due to the adsorption of montmorillonite and the viscosity regulation effect of hydroxypropyl methylcellulose in the post-extraction treatment process, the storage process is good in stability, and the gingerol is stored for 30 days in an extreme environment, the product has almost no change in properties, the content of the labeled component 6-gingerol is less reduced, and is only reduced by 0.021 percent.)

1. A method for extracting gingerol from ginger is characterized in that the method is realized by the steps of taking ginger as a raw material, taking montmorillonite and hydroxypropyl methylcellulose as auxiliary materials, sequentially drying, crushing, collecting dry ginger powder, mixing the dry ginger powder with an entrainer, performing carbon dioxide supercritical extraction, performing extraction post-treatment and the like; the entrainer is one or more of methanol, ethanol, acetone, diethyl ether and n-hexane; the mass ratio of the dried ginger powder to the entrainer is 1: 1-3.

2. The method for extracting gingerol from ginger according to claim 1, wherein the drying and crushing are carried out by placing the ginger in a reduced pressure drying oven, setting the vacuum degree at-0.06 to-0.08 MPa, the drying temperature at 40 to 50 ℃, drying until the water content is 5 to 9% to obtain the ginger, then placing the ginger in a universal crusher, crushing and sieving with a 30 to 60-mesh sieve, and collecting the powder to obtain the dried ginger powder.

3. The method for extracting gingerol from ginger according to claim 2, wherein the step of mixing the ginger powder with the entrainer is to place the prepared ginger powder in a suitable container with a stirrer, set the stirring speed to be 10-15 r/min, slowly add the entrainer under the stirring condition, and after the addition is finished, continue stirring for 5-10 min to obtain the mixed ginger powder for later use.

4. The method for extracting gingerol from ginger according to claim 3, wherein the carbon dioxide supercritical extraction is carried out by placing the prepared mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction apparatus, setting the flow of carbon dioxide at 15-20 kg/h, the pressure at 20-40 MPa, the temperature at 45-50 ℃ and the extraction time at 2-3 hours, and collecting the extract after the extraction is finished.

5. The method for extracting gingerol from ginger according to claim 4, wherein the entrainer is preferably a mixed solution of diethyl ether and methanol, the volume ratio of diethyl ether to methanol is 3:1, and the mass ratio of the dried ginger powder to the mixed solution of diethyl ether and methanol is preferably 1: 1.2-1.7.

6. The method for extracting gingerol from ginger according to claim 5, wherein the post-extraction treatment is performed by the following steps:

(1) placing the extract in a device with stirring, setting the stirring speed to be 20-30 r/min, adding montmorillonite under the stirring condition, and continuing stirring for 20-30 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 3-8;

(2) adding purified water into the mixture to 40-50 ℃, adding hydroxypropyl methylcellulose into the mixture under the stirring condition, and continuously stirring the mixture for 30-60 minutes to obtain an intermediate 2 for later use; the stirring speed is 12-18 r/min, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 7-11;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 30-40 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 1-3;

(4) and (3) placing the intermediate 3 in reduced pressure concentration equipment, setting the vacuum degree to be-0.06 to-0.08 MPa and the temperature to be 35-45 ℃, concentrating under reduced pressure for 1-2 hours, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.16-1.23 (25 ℃), thus obtaining the target product.

7. The method for extracting gingerol from ginger according to claim 6, wherein the particle size of montmorillonite is 60-150 μm, and the particle size of hypromellose is 120-180 μm.

Technical Field

The invention relates to the technical field of food, in particular to a method for extracting gingerol from ginger.

Background

The ginger has irregular branch blocky rhizomes, fragrant and special smell, pungent and warm taste, and is mainly used for treating the symptoms of exogenous wind-cold, stomach cold vomiting, wind-cold cough and the like. The dried ginger has granular section, is grey white or light yellow, has tiny oil spots and obvious ring veins, and has fragrant smell and pungent taste. It can be used for treating spleen and stomach cold syndrome, and cough due to cold retention with deficiency and cold-type hemorrhage. In recent years, China has made many studies on ginger, and the ginger can stop vomiting of pregnant women, has antibacterial and anti-inflammatory effects and relieves arthralgia; the ginger can help digestion and prevent gastric ulcer, the ginger can relieve menstrual pain, the ginger can prevent brain degeneration and the like, and the effective component in the ginger is gingerol.

Gingerol in addition to being a pungent and aromatic component in ginger, gingerol is also a main active ingredient and can be divided into six types, such as gingerols, shogaols, zingerone, paradols, gingerdione, gingerdiols, etc. The ginger mainly contains gingerols, wherein the content of 6-gingerols is the highest; shogaols in zingiber is significantly higher than ginger, indicating that during processing of ginger, high temperatures may allow gingerols to convert to shogaols via dehydration reactions, or to zingerone and fatty aldehydes via retro-aldol reaction decomposition; in addition, shogaols may cause polymerization 7,8 at temperatures above 120 ℃. The prior art shows that at present, gingerol is extracted by using gingers, and the technical problems of incomplete extraction, low gingerol transfer rate, dark appearance and color due to strong volatility, high loss, unstable storage process, easy degradation, low extraction yield and the like of subsequent separation still exist.

Disclosure of Invention

The invention aims to provide a method for extracting gingerol from ginger, which can effectively improve the extraction transfer rate of gingerol, and can ensure that the loss of gingerol is less in the separation process and the product property is stable.

The purpose of the invention is realized by the following technical scheme:

a method for extracting gingerol from ginger is characterized in that the method is realized by the steps of taking ginger as a raw material, taking montmorillonite and hydroxypropyl methylcellulose as auxiliary materials, sequentially drying, crushing, collecting dry ginger powder, mixing the dry ginger powder with an entrainer, performing carbon dioxide supercritical extraction, performing extraction post-treatment and the like; the entrainer is one or more of methanol, ethanol, acetone, diethyl ether and n-hexane; the mass ratio of the dried ginger powder to the entrainer is 1: 1-3.

Further, the drying and crushing are carried out by placing the ginger into a decompression drying oven, setting the vacuum degree to be-0.06-0.08 MPa, the drying temperature to be 40-50 ℃, drying until the moisture content is 5-9% to obtain the dried ginger, then placing the dried ginger into a universal crusher, crushing and sieving by a sieve of 30-60 meshes, and collecting powder to obtain dried ginger powder.

Further, the step of mixing the dry ginger powder and the entrainer is to place the prepared dry ginger powder in a suitable container with a stirrer, set the stirring speed to be 10-15 r/min, slowly add the entrainer under the stirring condition, and continue stirring for 5-10 min after the addition is finished, so as to obtain the mixed dry ginger powder for later use.

Further, the carbon dioxide supercritical extraction is to place the prepared mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, set the flow of carbon dioxide to be 15-20 kg/h, set the pressure to be 20-40 MPa, set the temperature to be 45-50 ℃, set the extraction time to be 2-3 hours, and collect the extract after the extraction is finished.

The extraction transfer rate of the gingerol can be greatly improved by matching the technological parameters in the supercritical carbon dioxide extraction process with the type and the dosage of a specific entrainer, the entrainer is preferably a mixed solution of diethyl ether and methanol, the volume ratio of the diethyl ether to the methanol is 3:1, and the mass ratio of the dry ginger powder to the mixed solution of the diethyl ether and the methanol is preferably 1: 1.2-1.7. The mixed solution of ether and methanol is used as entrainer, so that van der Waals force exists between the mixed solution and partial gingerol in dried ginger, and the solubility of gingerol in the supercritical carbon dioxide extraction process is improved.

Further, the post-extraction treatment is carried out according to the following steps:

(1) placing the extract in a device with stirring, setting the stirring speed to be 20-30 r/min, adding montmorillonite under the stirring condition, and continuing stirring for 20-30 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 3-8;

(2) adding purified water into the mixture to 40-50 ℃, adding hydroxypropyl methylcellulose into the mixture under the stirring condition, and continuously stirring the mixture for 30-60 minutes to obtain an intermediate 2 for later use; the stirring speed is 12-18 r/min, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 7-11;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 30-40 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 1-3;

(4) and (3) placing the intermediate 3 in reduced pressure concentration equipment, setting the vacuum degree to be-0.06 to-0.08 MPa and the temperature to be 35 to 45 ℃, concentrating under reduced pressure for 1 to 2 hours, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.16 to 1.23(25 ℃), thus obtaining the target product.

Montmorillonite is a clay mineral with a three-layer sheet structure consisting of aluminum-oxygen octahedron in the middle and silicon-oxygen tetrahedron at the upper part and the lower part, contains water and some exchange cations among crystal structure layers, has higher ion exchange capacity, and has very strong adsorption capacity and cation exchange performance, in the invention, the montmorillonite can adsorb volatile gingerol due to the addition of specific dosage of montmorillonite and a specific addition mode, and on the other hand, the mixed solvent consisting of methanol and ether of the entrainer has lower boiling point and is easy to volatilize, so that the loss of volatile gingerol can be reduced in the process of volatilizing the entrainer at low temperature; the viscosity of the whole intermediate 3 solution can be increased by the hydroxypropyl methylcellulose, so that the volatilization loss of volatile gingerol can be further reduced; after concentration, the montmorillonite can absorb the gingerol and reduce volatilization in the storage process of the gingerol in a finished product state, and the concentrated hypromellose can be formed into a film and can wrap the periphery of the gingerol and the montmorillonite to further prevent the gingerol from volatilizing, so that the gingerol is finally subjected to less volatilization loss in the whole post-extraction treatment and later storage stages.

Further, the particle size of the montmorillonite is 60-150 μm, and the particle size of the hydroxypropyl methylcellulose is 120-180 μm.

The invention has the following technical effects:

according to the method for extracting gingerol from ginger, the methanol and the ether form a specific entrainer, so that the extraction transfer rate of a labeled component gingerol can be greatly improved, the transfer rate of the labeled component 6-gingerol can be up to 64.3%, the volatile component loss of gingerol is less due to the adsorption of montmorillonite and the viscosity regulation effect of hydroxypropyl methylcellulose in the post-extraction treatment process, the storage process is good in stability, the gingerol is stored for 30 days in an extreme environment, the product property is almost unchanged, the content of the labeled component 6-gingerol is reduced by a small amount which is only reduced by 0.021%, and the product can be directly added as a functional additive of food, medicines and cosmetics.

Detailed Description

The present invention is described in detail below by way of examples, it should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art can make some insubstantial modifications and adaptations of the present invention based on the above-mentioned disclosure.

Example 1

A method for extracting gingerol from ginger comprises the following steps:

1. drying and crushing:

placing 16kg of ginger into a reduced pressure drying oven, setting the vacuum degree at-0.08 MPa and the drying temperature at 40 ℃, drying until the moisture content is 8.3% to obtain the ginger, then placing the ginger into a universal pulverizer, pulverizing and sieving with a 30-mesh sieve, and collecting powder to obtain dried ginger powder.

2. Mixing the dried ginger powder with an entrainer:

placing the dry ginger powder prepared in the step 1 in a stirring tank, setting the stirring speed to be 15 r/min, slowly adding an ether-methanol mixed solution with the volume ratio of 3:1 under the stirring condition, and continuously stirring for 5 min after the addition is finished to obtain mixed dry ginger powder for later use; the mass ratio of the dried ginger powder to the ether methanol mixed solution is 1: 1.7.

3. Carbon dioxide supercritical extraction:

placing the mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, setting the flow of carbon dioxide at 20kg/h, the pressure at 40MPa, the temperature at 45 ℃ and the extraction time at 2 hours, and collecting the extract after the extraction is finished.

4. And (3) extraction post-treatment:

(1) placing the extract in a stirring tank, setting the stirring speed to be 30 r/min, adding montmorillonite with the particle size of 60-150 mu m under the stirring condition, and continuing stirring for 20 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 8;

(2) adding purified water to 50 ℃, adding hydroxypropyl methylcellulose with the particle size of 120-180 mu m under the stirring condition, and continuously stirring for 30 minutes to obtain an intermediate 2 for later use; the stirring speed is 18 revolutions per minute, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 11;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 40 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 3;

(4) and (3) placing the intermediate 3 into a reduced pressure concentration device, setting the vacuum degree at-0.08 MPa and the temperature at 45 ℃, concentrating under reduced pressure for 1 hour, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.17(25 ℃), thus obtaining the intermediate.

The extraction transfer rate is equal to the total amount of 6-gingerol in the finished product, and the total amount of 6-gingerol in the fed ginger is multiplied by 100 percent

Because the 6-gingerol has stronger volatility and is not stable in all the components of the gingerol, the extraction transfer rate of the 6-gingerol is 60.9 percent, the percentage content of the 6-gingerol in the ginger is 0.091 percent, the total mass of the 6-gingerol is 14.56g, and the total mass of the 6-gingerol in the finished product is 8.86g by the calculation of the 6-gingerol label.

Example 2

A method for extracting gingerol from ginger comprises the following steps:

1. drying and crushing:

placing 12kg of ginger into a reduced pressure drying oven, setting the vacuum degree at-0.06 MPa and the drying temperature at 50 ℃, drying until the moisture content is 7.2% to obtain the dried ginger, then placing the dried ginger into a universal pulverizer, pulverizing and sieving with a 30-mesh sieve, and collecting powder to obtain dried ginger powder.

2. Mixing the dried ginger powder with an entrainer:

placing the dry ginger powder prepared in the step 1 into a stirring tank, setting the stirring speed to be 10 r/min, slowly adding an ether-methanol mixed solution with the volume ratio of 3:1 under the stirring condition, and continuously stirring for 10 min after the addition is finished to obtain mixed dry ginger powder for later use; the mass ratio of the dried ginger powder to the ether methanol mixed solution is 1: 1.2.

3. Carbon dioxide supercritical extraction:

placing the mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, setting the flow of carbon dioxide at 15kg/h, the pressure at 20MPa, the temperature at 45 ℃ and the extraction time at 3 hours, and collecting the extract after the extraction is finished.

4. And (3) extraction post-treatment:

(1) placing the extract in a stirring tank with a stirring speed of 20 r/min, adding montmorillonite with the particle size of 60-150 mu m under the stirring condition, and continuing stirring for 30 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 3;

(2) adding purified water to 40 ℃, adding hydroxypropyl methylcellulose with the particle size of 120-180 mu m under the stirring condition, and continuously stirring for 60 minutes to obtain an intermediate 2 for later use; the stirring speed is 12 revolutions per minute, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 7;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 30 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 1;

(4) and (3) placing the intermediate 3 into a reduced pressure concentration device, setting the vacuum degree at-0.06 MPa and the temperature at 45 ℃, concentrating under reduced pressure for 2 hours, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.22(25 ℃), thus obtaining the intermediate.

The extraction rate is 6-gingerol in the finished product and 6-gingerol in the fed ginger multiplied by 100 percent

Because the 6-gingerol has stronger volatility and is not stable in all the components of the gingerol, the extraction transfer rate of the 6-gingerol is 62.7 percent, the percentage content of the 6-gingerol in the ginger is 0.091 percent, the total mass of the 6-gingerol is 10.92g, and the total mass of the 6-gingerol in the finished product is 6.85g by the calculation of the 6-gingerol label.

Example 3

A method for extracting gingerol from ginger comprises the following steps:

1. drying and crushing:

taking 15kg of ginger, placing the ginger in a reduced pressure drying oven, setting the vacuum degree at-0.07 MPa and the drying temperature at 45 ℃, drying until the moisture content is 6.8 percent to obtain the ginger, then placing the ginger in a universal pulverizer, pulverizing and sieving by a 48-mesh sieve, and collecting powder to obtain dried ginger powder.

2. Mixing the dried ginger powder with an entrainer:

placing the dry ginger powder prepared in the step 1 into a stirring tank, setting the stirring speed to be 12 r/min, slowly adding an ether-methanol mixed solution with the volume ratio of 3:1 under the stirring condition, and continuously stirring for 8 min after the addition is finished to obtain mixed dry ginger powder for later use; the mass ratio of the dried ginger powder to the ether methanol mixed solution is 1: 1.5.

3. Carbon dioxide supercritical extraction:

placing the mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, setting the flow of carbon dioxide at 18kg/h, the pressure at 30MPa, the temperature at 48 ℃ and the extraction time at 2.5 hours, and collecting the extract after the extraction is finished.

4. And (3) extraction post-treatment:

(1) placing the extract in a stirring tank, setting the stirring speed to be 25 r/min, adding montmorillonite with the particle size of 60-150 mu m under the stirring condition, and continuing stirring for 25 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 6;

(2) adding purified water to 45 ℃, adding hydroxypropyl methylcellulose with the particle size of 120-180 mu m under the stirring condition, and continuously stirring for 50 minutes to obtain an intermediate 2 for later use; the stirring speed is 16 revolutions per minute, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 9;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 35 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 2;

(4) and (3) placing the intermediate 3 into a reduced pressure concentration device, setting the vacuum degree at-0.07 MPa and the temperature at 40 ℃, concentrating under reduced pressure for 1.5 hours, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.21(25 ℃), thus obtaining the intermediate.

The extraction rate is 6-gingerol in the finished product and 6-gingerol in the fed ginger multiplied by 100 percent

Because the 6-gingerol has stronger volatility and is not stable in all the components of the gingerol, the extraction transfer rate of the 6-gingerol is 64.3 percent, the percentage content of the 6-gingerol in the ginger is 0.091 percent, the total mass of the 6-gingerol is 13.65g, and the total mass of the 6-gingerol in the finished product is 8.78g by the calculation of the 6-gingerol label.

Example 4

A method for extracting gingerol from ginger comprises the following steps: (following the procedure of example 3, except that only carbon dioxide supercritical extraction was carried out without entrainer addition during the preparation):

a method for extracting gingerol from ginger comprises the following steps:

1. drying and crushing:

taking 15kg of ginger, placing the ginger in a reduced pressure drying oven, setting the vacuum degree at-0.07 MPa and the drying temperature at 45 ℃, drying until the moisture content is 7.0 percent to obtain the ginger, then placing the ginger in a universal pulverizer, pulverizing and sieving by a 48-mesh sieve, and collecting powder to obtain dried ginger powder.

2. Carbon dioxide supercritical extraction:

placing the obtained dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, setting the flow of carbon dioxide at 18kg/h, the pressure at 30MPa, the temperature at 48 ℃ and the extraction time at 2.5 hours, and collecting the extract after the extraction is finished.

3. And (3) extraction post-treatment:

(1) placing the extract in a stirring tank, setting the stirring speed to be 25 r/min, adding montmorillonite with the particle size of 60-150 mu m under the stirring condition, and continuing stirring for 25 min to obtain an intermediate 1; the mass ratio of the extract to the montmorillonite is 100: 6;

(2) adding purified water to 45 ℃, adding hydroxypropyl methylcellulose with the particle size of 120-180 mu m under the stirring condition, and continuously stirring for 50 minutes to obtain an intermediate 2 for later use; the stirring speed is 16 revolutions per minute, and the mass ratio of the purified water to the hydroxypropyl methylcellulose is 100: 9;

(3) taking the intermediate 2, adding the intermediate 1 into the intermediate 2 under the stirring condition, and continuously stirring for 35 minutes to obtain an intermediate 3 for later use; the mass ratio of the intermediate 1 to the intermediate 2 is 1: 2;

(4) and putting the intermediate 3 into a reduced pressure concentration device, setting the vacuum degree at-0.07 MPa and the temperature at 40 ℃, concentrating under reduced pressure for 1.5 hours, volatilizing ether and methanol in the intermediate 3, and concentrating until the relative density of the intermediate 3 is 1.22(25 ℃), thus obtaining the intermediate.

The extraction rate is 6-gingerol in the finished product and 6-gingerol in the fed ginger multiplied by 100 percent

Because the 6-gingerol has stronger volatility and is not stable in all the components of the gingerol, the extraction transfer rate of the 6-gingerol is 48.4 percent, the percentage content of the 6-gingerol in the ginger is 0.091 percent, the total mass of the 6-gingerol is 13.65g, and the total mass of the 6-gingerol in the finished product is 6.61g by the calculation of the 6-gingerol label.

Example 5

A method for extracting gingerol from ginger comprises the following steps: (the procedure of example 3 was followed except that montmorillonite and hypromellose were not added in the post-extraction treatment during the preparation):

a method for extracting gingerol from ginger comprises the following steps:

1. drying and crushing:

taking 15kg of ginger, placing the ginger in a reduced pressure drying oven, setting the vacuum degree at-0.07 MPa and the drying temperature at 45 ℃, drying until the moisture content is 6.9 percent to obtain the ginger, then placing the ginger in a universal pulverizer, pulverizing and sieving by a 48-mesh sieve, and collecting powder to obtain dried ginger powder.

2. Mixing the dried ginger powder with an entrainer:

placing the dry ginger powder prepared in the step 1 into a stirring tank, setting the stirring speed to be 12 r/min, slowly adding an ether-methanol mixed solution with the volume ratio of 3:1 under the stirring condition, and continuously stirring for 8 min after the addition is finished to obtain mixed dry ginger powder for later use; the mass ratio of the dried ginger powder to the ether methanol mixed solution is 1: 1.5.

3. Carbon dioxide supercritical extraction:

placing the mixed dry ginger powder in an extraction kettle of a carbon dioxide supercritical extraction instrument, setting the flow of carbon dioxide at 18kg/h, the pressure at 30MPa, the temperature at 48 ℃ and the extraction time at 2.5 hours, and collecting the extract after the extraction is finished.

4. And (3) extraction post-treatment:

and (3) placing the extract in the step (3) into a reduced pressure concentration device, setting the vacuum degree at-0.07 MPa and the temperature at 40 ℃, and concentrating under reduced pressure for 1.5 hours until the relative density of the extract is 1.19(25 ℃), thus obtaining the extract.

The extraction rate is 6-gingerol in the finished product and 6-gingerol in the fed ginger multiplied by 100 percent

Because the 6-gingerol has stronger volatility and is not stable in all the components of the gingerol, the extraction transfer rate of the 6-gingerol is 51.2 percent, the percentage content of the 6-gingerol in the ginger is 0.091 percent, the total mass of the 6-gingerol is 13.65g, and the total mass of the 6-gingerol in the finished product is 6.99g by the calculation of the 6-gingerol label.

As shown in the detection results of the above examples, the transfer rate of 6-gingerol in examples 1, 2 and 3 is significantly higher than that in examples 4 and 5, so that the extraction transfer rate of gingerol can be significantly improved by the method of adding entrainer and post-extraction treatment.

Experiment one: the samples of examples 1, 2, 3, 4 and 5 were packaged in the market, and then placed in an environment with a temperature of 15 ℃ and a relative humidity of 65% for 30 days to examine the percentage change of 6-gingerol, and the test results are shown in the following table:

as a result: as can be seen from the above table, under the condition of the storage temperature far higher than 6-gingerol, in example 4, because montmorillonite and hypromellose are not added, the percentage content of 6-gingerol is reduced more, and the color becomes darker, and may be degraded due to volatilization in the placement process or poor stability of itself, while in examples 1, 2, 3 and 4, under the conditions of montmorillonite adsorption and hypromellose wrapping, the percentage content of 6-gingerol is reduced relatively less, and the character is almost unchanged from 0 day, therefore, the specific dosage and specific adding mode of montmorillonite and hypromellose of the invention can improve the stability of gingerol, and is more beneficial to long-term storage, and can be directly added as a functional additive of food, medicine or cosmetic.