Acanthopanax senticosus harms homogeneous polysaccharide, and preparation method therefor and use thereof

Abstract

Disclosed is an Acanthopanax senticosus Harms homogeneous polysaccharide, having a molecular weight of 6.83 × 105Da, and consisting of arabinose, galactose, glucose, mannose and xylose, with the mole

Description

ACANTHOPANAX SENTICOSUS HARMS HOMOGENEOUS POLYSACCHARIDE, AND PREPARATION METHOD THEREFOR AND USE THEREOF TECHNICAL FIELD

[001] The present invention relates to the field of pharmaceutical technologies, in particular to an Acanthopanax senticosus homogeneous polysaccharide, and a preparation method and use thereof. BACKGROUND

[002] Acanthopanax senticosus is the dried radix and rhizome or stem of Acanthopanax senticosus (Rupr. Et Maxim.) Harms belonging to Acanthopanax Miq. plants in Araliaceae, which is widely distributed in the Far East coniferous forest belt of the Russia, the northeast, Hebei and Shanxi of China, the northern regions of Japan and Korea. It is also known as Wujiashen, Ciguaibang, and Laohuliaozi. In traditional Chinese medicine, the use of the Acanthopanax senticosus as a medicine has a long history and has been recorded in the herbal works of the past generations. Tao Hongjing in the Southern Dynasty (420-589) pointed out in Miscellaneous Records of Famous Physicians in China that "Acanthopanax senticosus with five-leaf were beneficial" and Acanthopanax senticosus had the effect of "tonifying the center, benefiting the essence, strengthening the bones and muscles, and enhancing the willpower". Li Shizhen in the Ming Dynasty (1368-1644) stated in the Compendium of Materia Medica that the Acanthopanax senticosus was a "superior product in the Classic" and had the effect of "tonifying the centerand benefiting Qi, strengthening the bones and muscles, and enhancing the willpower, and keeping the body fit after long-term administration". The Acanthopanax senticosus is warm in mature, pungent in smell and slightly bitter in taste, which can be used for treating diseases caused by spleen meridian, kidney meridian and heart meridian, and is mainly used for treating spleen and kidney Yang deficiency, asthenia, inappetence, aching waist and knees, insomnia and dreaminess. (Pan Jingzhi, Jin Sha, Cui Wenyu, et al. Research progress on chemical constituents and pharmacological activities of Acanthopanax senticosus [J]. Food Industry Science and Technology, 2019, 40 (23): 353-360). The Acanthopanax senticosus has a variety of pharmacological activities such as immune function regulation, anticancer, liver-protecting, anti-aging, antioxidant, anti-inflammatory, hypotensive and anti-stress activities, and other pharmacological activities, and its active constituents are Acanthopanax glycosides, flavonoids, lignans, polysaccharides, etc. However, these were experimental results of crude polysaccharides, which were poor in repeatability and cannot make standardized products, so the industrialization value was limited. Based on the previous research, the present invention carries out separation and purification, structural analysis and biological activity evaluation on Acanthopanax senticosus crude polysaccharide so as to obtain an Acanthopanax senticosus homogeneous polysaccharide with an excellent biological activity, which is not only of great scientific significance, but also can lay a foundation for the industrialization of the Acanthopanax senticosus homogeneous polysaccharide. SUMMARY

[003] The technical problem to be solved by the present invention is to provide an Acanthopanax senticosus homogeneous polysaccharide with a medicinal value, which is a polysaccharide condensed by monosaccharide molecules and which is prepared by grading Acanthopanax senticosus polysaccharides according to molecular weights, then further separating and purifying, and carrying out structural characterization, and to perform preliminary study on an antioxidant activity and an anti-skin aging activity of the obtained Acanthopanax senticosus homogeneous polysaccharide.

[004] An object of the present invention is to provide an Acanthopanax senticosus homogeneous polysaccharide, having a molecular weight of 6.83x10°Da, and consisting of arabinose, galactose, glucose, mannose and xylose, with molar percentages of all the monosaccharides sequentially being 16.42%, 32.27%, 40.38%, 7.21% and 3.72%.

[005] Another object of the present invention is to provide a preparation method of the Acanthopanax senticosus homogeneous polysaccharide. The preparation method includes the following steps:

[006] 1) crushing dried Acanthopanax senticosus decoction chips to a medicinal powder, sieving, adding water 5 to 8 times the weight of the sieved medicinal powder, extracting for 3 times at 80°C to 100°C for 2 h each time to obtain extract solutions, combining the extract solutions and centrifuging the combined extract solutions, collecting a supernatant, and concentrating the supernatant to obtain a concentrated solution;

[007] 2) after the concentrated solution is cooled, adding a a-amylase until a weight content thereof is 0.1% to 0.4%, adjusting a pH value to 7.0, and performing enzymatic digestion in a water bath at 60°C until a solution has no color change when the solution meets an iodine-potassium iodide reagent, quickly heating up to 100°C and keeping for 5 min for enzyme deactivation, centrifuging, and collecting a supernatant;

[008] 3) mixing the supernatant collected in step 2) with Sevage reagent according to a volume ratio of 1:1, shaking violently for 30 min, standing for 12 h, collecting an upper polysaccharide solution, mixing the upper polysaccharide solution with the Sevage reagent according to a volume ratio of 1:1, and repeating the above operations until no protein characteristic absorption peak appears in ultraviolet scanning;

[009] 4) after the upper polysaccharide solution finally collected in step 3) is concentrated, adding absolute ethanol 4 to 6 times the volume of the concentrated upper polysaccharide solution, standing at 4°C for precipitation for 48 h, centrifuging, and collecting a precipitate; adding anhydrous ethanol to the precipitate, the above operations are repeated for 3 times, followed by freeze-drying so as to obtain an Acanthopanax senticosus crude polysaccharide powder;

[0010] 5) after the Acanthopanax senticosus crude polysaccharide powder obtained in step 4) is completely dissolved in distilled water, separating by means of a DEAE Fast Flow ion chromatographic column, wherein elution conditions are as follows: a flow rate is 2.5 mL / min, and pure water, sodium chloride solutions with 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.4 mol / L and 1 mol / L are sequentially used for elution; performing tracking detection by means of a sulfuric acid-phenol method, collecting eluents;

[0011] 6) after the eluents collected in step 5) are concentrated, separating again by means of a Sephadex G-200 glucan gel column chromatographic column, eluting with the distilled water at a flow rate of 0.5 mL / min, and after detection by a phenol-sulfuric acid method, collecting a main peak part in an elution curve;

[0012] 7) after a solution of the main peak part in the elution curve collected in step 6) is concentrated, dialyzing for 2 days by means of a dialysis bag with a molecular weight cutoff of 3,500 Da for desalination, and finally concentrating and freeze-drying a solution in the dialysis bag to obtain an Acanthopanax senticosus homogeneous polysaccharide powder.

[0013] The present invention provides a preparation method of the Acanthopanax senticosus homogeneous polysaccharide. The preparation method includes the following steps:

[0014] 1) crushing dried Acanthopanax senticosus decoction chips to a medicinal powder, sieving with a 100-mesh sieve, extracting the sieved medicinal powder with water 5 to 8 times the weight of the medicinal powder for 3 times at 80°C to 100°C for 2 h each time to obtain extract solutions, combining the extract solutions, centrifuging the combined extract solutions at 3000 rpm for 20 min, then collecting a supernatant, and concentrating the supernatant by rotary evaporation to one-fifth of an original volume of the supernatant to obtain a concentrated solution;

[0015] 2) after the concentrated solution is cooled, adding a a-amylase until a weight content thereof is 0.1% to 0.4%, adjusting a pH value to 7.0, and performing enzymatic digestion in a water bath at 60°C for 4 h (where a solution has no color change when the solution meets an iodine-potassium iodide reagent), quickly heating up to 100°C and keeping for 5 min for enzyme deactivation, then centrifuging at 3000 rpm for 10 min, and collecting a precipitate;

[0016] 3) mixing the supernatant collected in step 2) with Sevage reagent (wherein the Sevage reagent is prepared by mixing chloroform and n-butanol according to a volume ratio of 4:1) according to a volume ratio of 1:1, shaking violently for 30 min, standing for 12 h, collecting an upper polysaccharide solution, mixing the upper polysaccharide solution with the Sevage reagent according to a volume ratio of 1:1, and repeating the above operations until no protein characteristic absorption peak appears in ultraviolet scanning;

[0017] 4) after the upper polysaccharide solution finally collected in step 3) is concentrated, adding absolute ethanol 4 to 6 times the volume of the concentrated upper polysaccharide solution, standing at 4°C for precipitation for 48 h, centrifuging at 3000 rpm for 10 min, and collecting a precipitate; adding anhydrous ethanol to the precipitate, repeating the above operations for 3 times to obtain a final precipitate, and freeze-drying the final precipitate to obtain an Acanthopanax senticosus crude polysaccharide powder;

[0018] 35) after the Acanthopanax senticosus crude polysaccharide powder obtained in step 4) is completely dissolved in distilled water, separating by means of a DEAE Fast Flow ion chromatographic column, wherein elution conditions are as follows: a flow rate is 2.5 mL / min, and pure water, sodium chloride solutions with 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.4 mol / L and 1 mol / L are sequentially used for elution; collecting eluents in gradient by means of an automatic collector, wherein an volume of each solution in gradient elution is three times a column volume, and 30 tubes with each of which contains 5.0 mL eluent are collected; performing tracking detection every other tube by means of a sulfuric acid-phenol method;

[0019] 6) after the eluents collected in step 5) are concentrated, separating again by means of a Sephadex G-200 glucan gel column chromatographic column, eluting with the distilled water at a flow rate of 0.5 mL / min, colleting by means of the automatic collector, each tube containing 5.0 mL eluent, and after detection by a phenol-sulfuric acid method, collecting a main peak part in an elution curve;

[0020] 7) after a solution of the main peak part in the elution curve collected in step 6) is concentrated, dialyzing for 2 days by means of a dialysis bag with a molecular weight cutoff of 3,500 Da for desalination, and finally concentrating and freeze-drying a solution in the dialysis bag to obtain an Acanthopanax senticosus homogeneous polysaccharide powder.

[0021] Furthermore, in the Sevage reagent, the volume ratio of chloroform to n-butanol is 4: 1.

[0022] The present invention discloses that by means of the technical solution of a water extraction and alcohol precipitation method for extraction, the DEAE Fast Flow anion exchange chromatographic column and Sephadex G-200 gel chromatographic column for further separation and purification, an Acanthopanax senticosus homogeneous polysaccharide having a molecular weight of 6.83x10° Da and consisting of arabinose, galactose, glucose, mannose and xylose is obtained.

[0023] Tests prove that the Acanthopanax senticosus homogeneous polysaccharide powder prepared by the present invention has multiple effects such as antioxidant, skin aging resistance, and can be used for in the preparation of anti-skin aging cosmetics or a therapeutic medicine for skin.

[0024] The present invention further relates to a skin care cosmetic, including the Acanthopanax senticosus homogeneous polysaccharide with the anti-skin aging effect, and an auxiliary material used in a cosmetic field.

[0025] The present invention further relates to a therapeutic medicine for skin, including the Acanthopanax senticosus homogeneous polysaccharide with the anti-skin aging effect, and a medically-acceptable carrier.

[0026] The Acanthopanax senticosus homogeneous polysaccharide provided by the present invention may be especially used for preparing a skin care cosmetic, including a cream, emulsion, toner, gel, facial mask, liniment or lotion, but is not limited to the above preparation forms. According to the known methods in the industrial field of skin care products, after being sterilized by a known method, compositions composed of the above Acanthopanax senticosus homogeneous polysaccharide and auxiliary materials used in the cosmetics field may be prepared into various external preparations.

[0027] In case of preparing a skin care cosmetic, the prepared Acanthopanax senticosus homogeneous polysaccharide powder may be mixed with a matrix or an auxiliary material of a known cosmetic and medicine, a carrier and an additive according to a conventional method, wherein the Acanthopanax senticosus homogeneous polysaccharide powder accounts for 3%-10% of a total weight of the cosmetic. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Fig. 1 shows an elution curve graph of Acanthopanax senticosus crude polysaccharide components passing through a DEAE Fast Flow ion chromatographic column.

[0029] Fig. 2 shows a HPGPC gel chromatogram of an Acanthopanax senticosus homogeneous polysaccharide.

[0030] Fig. 3 is a GC-MS total ion current chromatogram of six standard monosaccharides.

[0031] Fig. 4 is a GC-MS total ion current chromatogram of the Acanthopanax senticosus homogeneous polysaccharide.

[0032] Fig. 5 is an infrared spectrum of the Acanthopanax senticosus homogeneous polysaccharide.

[0033] Fig. 6 is a 'H spectrum of the Acanthopanax senticosus homogeneous polysaccharide. Note: (left — right).

[0034] Fig. 7 is a °C spectrum of the Acanthopanax senticosus homogeneous polysaccharide. Note: (left — right). DETAILED DESCRIPTION

[0035] The present invention will be further described in detail by specific examples below.

[0036] Examplel: Preparation and structural characterization of Acanthopanax senticosus homogeneous polysaccharide

[0037] |. Extraction of the Acanthopanax senticosus crude polysaccharide.

[0038] Dried Acanthopanax senticosus decoction chips were crushed into a medicinal powder, and the medicinal powder was sieved with a 100-mesh sieve; the sieved medicinal powder was extracted with water 5 times the weight thereof for 3 times at 80°C for 2 h each time to obtain extract solutions; the extract solutions were combined; the combined extract solutions were centrifuged at 3000 rpm for 20 min, and then a supernatant was collected; and the supernatant was concentrated by rotary evaporation to one fifth of the original volume of the supernatant to obtain a concentrated solution. After the concentrated solution was cooled,a-amylase was added into the concentrated solution until the weight content of the a-amylase was 0.1%; the pH value was adjusted to 7.0, enzymatic reaction was performed in a water bath at 60°C for 4 h (where the solution had no color change when the solution met an iodine-potassium iodide reagent), temperature was quickly raised to 100°C and kept for 5 min to inactivate the enzyme; and then centrifugation was performed at 3000 rpm for 10 min, and a supernatant was collected. The supernatant was mixed with Sevage reagent (the Sevage reagent was prepared by mixing chloroform and n-butanol according to a volume ratio of 4:1) at a volume ratio of 1:1, shaking was performed violently for 30 min, standing for 12 h, and an upper polysaccharide solution was collected and then mixed with the Sevage reagent according to a volume ratio of 1:1, and the above operations were repeated until no protein characteristic absorption peak appeared in ultraviolet scanning. After the finally collected upper polysaccharide solution was concentrated, anhydrous ethanol 4 times the volume of the collected upper polysaccharide solution was added, standing at 4°C for precipitation was carried out for 48 h, centrifugation was performed at 3000 rpm for 10 min, and a precipitate was collected. The anhydrous ethanol was added to the precipitate, the above operations were repeated for 3 times to obtain a final precipitate, and the final precipitate was freeze-dried to obtain an Acanthopanax senticosus crude polysaccharide powder.

[0039] 2. Purification of the Acanthopanax senticosus homogeneous polysaccharide

[0040] After the obtained Acanthopanax senticosus crude polysaccharide powder was completely dissolved in distilled water, separation was performed by means of a DEAE Fast Flow ion chromatographic column, wherein elution conditions were as follows: a flow rate was 2.5 mL / min, and water, sodium chloride solutions with 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.4 mol / L and 1 mol / L were sequentially used for elution. Eluents were collected in gradient by an automatic collector, wherein the volume of each solution in gradient elution was three times a column volume, and 30 tubes, each of which contained 5.0 mL eluent were collected; and tracking detection every other tube was performed by means of a sulfuric acid-phenol method. An elution curve of the Acanthopanax senticosus crude polysaccharide components passing through the DEAE Fast Flow ion chromatographic column was shown in Fig. 1.

[0041] On one hand, after the collected liquids corresponding to the different eluents were concentrated to liquids of certain volumes, the concentrated liquids were dialyzed by means of a dialysis bag (with a molecular weight cutoff of 3,500 Da). Water in a beaker with the dialysis bag was changed 5 times each day, and after dialysis for 7 days, a polysaccharide solution in the dialysis bag was centrifuged, and freeze-drying was performed to obtain a preliminarily-purified Acanthopanax senticosus polysaccharide.

[0042] On the other hand, after the collected eluents were concentrated, the concentrated eluents were separated again by means of a Sephadex G-200 glucan gel column chromatographic column, the separated eluents were eluted with distilled water at a flow rate of 0.5 mL / min. Eluents were collected by the automatic collector, wherein each tube contained 5.0 mL eluent; and after detection by means of a sulfuric acid-phenol method, a main peak part in an elution curve was collected. Then, after a solution of the collected main peak part in the elution curve was concentrated, the concentrated solution was dialyzed for 2 days by means of a dialysis bag with a molecular weight cutoff of 3,500 Da for desalination, and finally, a solution in the dialysis bag was concentrated and freeze-dried to obtain the Acanthopanax senticosus homogeneous polysaccharide powder.

[0043] 3. Purity identification of the Acanthopanax senticosus homogeneous polysaccharide

[0044] High-performance liquid chromatography conditions were as follows: an Agilent 1200 high-performance liquid chromatograph, a TSK GEL G3000PWx. (7.8x300 mm, 7 um) chromatographic column and a TSK GEL G5000PWxv (7.8x300 mm, 10 pum) chromatographic column that were in series connection, a mobile phase being a 0.02 mol / L KH>POy4 solution, a flow rate being 0.5 mL / min, a column temperature being 35°C, and a Waters 2414 differential refractive index detector. The Acanthopanax senticosus homogeneous polysaccharide obtained in step 2 was dissolved in a proper amount of water, and a sample injection volume was 10 pL. Results were shown in Fig. 2, and a chromatographic peak of the Acanthopanax senticosus homogeneous polysaccharide in a chromatogram was a single symmetrical peak, indicating that the Acanthopanax senticosus homogeneous polysaccharide prepared by the present invention was indeed a homogeneous polysaccharide.

[0045] 4. Determination of molecular weight of the Acanthopanax senticosus homogeneous polysaccharide

[0046] 1 mg of pullulans with molecular weights of 50 KDa, 80 KDa, 150 KDa, 270 KDa, 410 KDa and 670 KDa were dissolved in 1mL of water, respectively, and the chromatographic conditions were the same as above. An Agilent 1200 high-performance liquid chromatograph was used for analysis, a retention time was recorded, a logarithm of a relative molecular weight (1ogM) was taken as an ordinate and the retention time (t) as an abscissa to obtain a standard curve Y = 14.62-0.980X. A peak appearance time of the Acanthopanax senticosus homogeneous polysaccharide was substituted into the curve equation, and then, the molecular weight of the Acanthopanax senticosus homogeneous polysaccharide was 6.83x10° Da.

[0047] 5. Structural characterization of the Acanthopanax senticosus homogeneous polysaccharide

[0048] 5.1 Analysis of polysaccharide components

[0049] Firstly, acid hydrolysis was performed, then acetylation was performed for derivation, and gas phase GC analysis was performed. A method for acid hydrolysis was: weighing 10 mg of Acanthopanax senticosus homogeneous polysaccharide samples, placing them in ampoules, respectively, 4 mL trifluoroacetic acid with a concentration of 2 mol / L was added into each ampoule, air in the ampoule was blown off with nitrogen, and the ampoule was sealed with an alcohol blowtorch. After hydrolysis at 110°C for 6 h, each sample was dried by rotary evaporation, 2 mL of methanol was added into the dried sample for dissolution, drying by evaporation, and the operations were repeated for 3 times, so as to remove trifluoroacetic acid from the sample as much as possible to obtain a polysaccharide hydrolysate. 1 mL of methanol was added into the sample, and the sample was transferred to a serum bottle, blow-drying with nitrogen, 1.0 mL pyridine, 10 mg hydroxylamine hydrochloride and 1.0 mg internal-standard inositol were added into the polysaccharide hydrolysate, reaction was performed under shocking for 0.5 h at a constant temperature of 90°C, after cooling, | mL acetic anhydride was added, and acetylation was performed for 0.5 h at 90°C. After cooling, water was added to stop the reaction. Then, 2.0 mL chloroform was added for extraction for 3 times, after excess water was removed with anhydrous sodium sulfate, filtration was performed with a 0.22 um organic phase filter membrane. Each monosaccharide standard substance was also derivatized according to the above steps.

[0050] After derivatization according to the above method, GC analysis was performed. GC detection conditions were as follows: an Aglient 6890N gas chromatography system using an Agilent HP-5 silica capillary column (30 mx 0.32 mmx0.25um); a constant pressure mode being 20 PSI, a carrier gas being Na; a sample injection volume being 1.0 pL; a flow rate being 1.0 ml / min; a temperature at a sample injection port being 250°C; a temperature of an FID detector being set to 250°C; the sample injection port adopting a splitlessmode; and temperature programmed: an initial temperature being 100°C kept for 30 seconds, raising the temperate to 160°C at 3°C / min, changing a temperature raising rate, and continuing to raise the temperature. The temperature was raised to 250°C at the rate of 10°C / min and kept for 5 min. A GC-MS total ion current chromatogram of six monosaccharide standard substances, namely, arabinose, galactose, glucose, mannose, xylose and fucose, was shown in Fig. 3, and a GC-MS total ion current chromatogram of the Acanthopanax senticosus homogeneous polysaccharide was shown in Fig. 4.

[0051] GC results were as follows. Analysis was performed according to retention times of the six monosaccharide standard substances such as arabinose, galactose, glucose, mannose, xylose and fucose, molar percentages of monosaccharides in the Acanthopanax senticosus homogeneous polysaccharide were calculated by a peak appearance area ratio. Results showed that compared with the retention times in a GC chromatogram of the monosaccharide standard substances, the Acanthopanax senticosus homogeneous polysaccharide was composed of arabinose, galactose, glucose, mannose and xylose, and the molar percentages of the five monosaccharides calculated by an internal standard method were 16.42%, 32.27%, 40.38%, 7.21% and 3.72%.

[0052] 5.2 Infrared spectrum scanning of the Acanthopanax senticosus homogeneous polysaccharide

[0053] 2.0 mg of an Acanthopanax senticosus homogeneous polysaccharide sample was weighed, and mixed with a potassium bromide powder; a mixture was ground evenly, and the evenly ground mixture was compressed into a tablet. Then, the tablet was placed in a Fourier transform infrared spectrometer for infrared scanning (400 cm™ to 4000 cm), and an infrared absorption spectrum of the sample was recorded. Results were shown in Fig. 5. It could be seen from an IR image that the Acanthopanax senticosus homogeneous polysaccharide had typical polysaccharide absorption characteristics. 3456 cm™ and 2929 cm’ were stretching vibration peaks of an O-H bond, and 1744 cm’ was a stretching vibration peak of a C-H in CHa; 1635 cm™ was a stretching vibration peak caused by CO or associated water, 1411 cm™ was a variable angle vibration peak of a C-O bond, and 1242 cm’ was a stretching vibration peak caused by a primary alcohol B-OH; an absorption peak at 1021 cm™ indicated that the Acanthopanax senticosus homogeneous polysaccharide contained a pyran ring, while an absorption peak at 893 cm indicated that the Acanthopanax senticosus homogeneous polysaccharide had a B-glycosidic bond, while an absorption peak at 835 cm! indicated that the Acanthopanax senticosus homogeneous polysaccharide had a a-glycosidic bond.

[0054] 5.3 Methylation analysis of the Acanthopanax senticosus homogeneous polysaccharide

[0055] 20 mg of an Acanthopanax senticosus homogeneous polysaccharide sample (keeping the sample sufficiently dry) was weighed and put in a test tube with a plug; 6 mL of a dimethyl sulfoxide DMSO reagent was added in the test tube, and an opening of the test tube was sealed with nitrogen; heating; even stirring by means of magnetic force; and sodium hydroxide (6 mL of DMSO contains 240 mg of sodium hydroxide) was added to form a sodium hydroxide turbid liquid left overnight. 3.6 mL of methyl iodide was added to the test tube until the next day and stirring for 8 min, methyl iodide was blown off with nitrogen, and methylation was performed again; and after the above operations were repeated for 3 times, 6 mL of distilled water was added to stop the reaction. After dialyzing with running water and deionized water for 24 h, respectively, extraction with chloroform was performed for 3 times, drying was performed with anhydrous sodium sulfite for 24 h, then, blow-drying was performed with nitrogen, and about 1 mL of a solution was left. Trifluoroacetic acid was used to hydrolyze the solution, 70 mg of sodium borohydride NaBH: was added, stirring was performed for 24 h; then, highly-acidic cation-anion exchange resin was added, a mixture was stirred evenly for 10 min, and extraction filtration was performed; a filtrate was collected and added with methanol; blow-drying with the nitrogen; and then, 0.5 mL of acetic anhydride and 0.5 ml of anhydrous pyridine were added, and acetylation was performed at 100°C for 2 h. After the reaction, absolute ethanol was repeatedly added to remove acetic anhydride, and then, GC-MS analysis was performed.

[0056] GC-MS chromatographic conditions were as follows: Agilent 6890-5973N gas chromatography-mass spectrometer, and a chromatographic column: an HP-5 MS capillary column (30 m*250 pmx0.25 umD); a carrier gas: helium e; a temperature of a heater: 250°C; temperature programmed: raising an initial temperature of 140°C to 200°C, keeping for 5 min, and then, raising the temperature to 240°C at 8°C / min; a split ratio: 50: 1; and a sample injection volume: 5 pL. Methylation analysis data of the Acanthopanax senticosus homogeneous polysaccharide was shown in Table 1. Methylation results of the Acanthopanax senticosus homogeneous polysaccharide showed that the Acanthopanax senticosus homogeneous polysaccharide was mainly composed of —,6)-B-Galp(1—, and Glcp residues were the main units of the Acanthopanax senticosus homogeneous polysaccharide, which existed in 1—4, 1—6, 1—4,6 and 1— connection modes, while the Galp residues existed in the 1—4 connection mode. Table 1: Methylation analysis data of the Acanthopanax senticosus homogeneous polysaccharide | No. | Methylation residue | Type of glycosidic bond | Molar percentage (mol.%) | 1 2,4-Me3-Glcp —4)-B-Glep(1— 10.8 |2 | 2.3-Me2-Glep —4,6)-B-Glep(1— 96 |3 | 24.6-Me3-Galp —,6)--Galp(1— | 715 | 4 2,3,6-Me3-Glep —4)-B-Glep(1— |52 [s |2346MedGlep | p-Glep(i— [29

[0057] 5.4 NMR analysis of the Acanthopanax senticosus homogeneous polysaccharide

[0058] 30 mg of the dried Acanthopanax senticosus homogeneous polysaccharide was dissolve in 0.5 ml D0, heating at 60°C was performed for 1 h to enable the dried Acanthopanax senticosus homogeneous polysaccharide to be completely dissolved, then, a solution was transferred to a nuclear magnetic tube, 'H spectrum and '3C spectrum were measured on an AV300 nuclear magnetic resonance spectrometer from Brucker Company, Germany. Results were shown in Fig. 6 and Fig. 7. It could be seen from the spectrogram that a signal distribution range of the 'H spectrum of the Acanthopanax senticosus homogeneous polysaccharide was narrow, mainly concentrated in 52.0-6.0 ppm (4.19, 4.09, 4.07, 4.00, 3.95, 3.90, 3.70, 3.68, 3.65, 3.64, 3.62, 3.61, 3.60, 3.59, 3.58, 3.55, 3.54 and 3.52 ppm). While a C spectrum signal range of the Acanthopanax senticosus homogeneous polysaccharide is 860-110 ppm (107.41, 106.83, 106.36, 103.62, 95.72, 92.11, 91.85, 84.00, 81.31, 76.81, 76.64, 76.31, 75.50, 71.24, 71.14, 71.00, 69.89, 69.21, 69.14, 62.30, 61.26, 61.05, 60.68 and 60.42 ppm). See Table 2 for a chemical shift attribution of anomeric carbon of each monosaccharide residue in the Acanthopanax senticosus homogeneous polysaccharide. Table 2: Hydrocarbon chemical shift attribution of the Acanthopanax senticosus homogeneous polysaccharide [No. Monosaccharide residue [er mr | a —5)-0-D-GalAp | 903 | 737 |B —4)pL-Araf(1— | 93.2 | 12.50 |c @-D-Rhap-(1— 91.06 8.81 |p —3,4)-0-L-GalAp (1 108.2 427 | E —3,4)-8-D-Galp -(1— 107.3 8.58 [F —>4)-B-L-GalAp-(1— 96.7 7.86

[0059] Example 2: Evaluation of antioxidant activity of the Acanthopanax senticosus homogeneous polysaccharide

[0060] Modern medicine believes that a key of skin aging is the oxidative stress of dermis and epidermis caused by various factors, so substances with a strong antioxidant effect have a better anti-skin aging effect. This experiment aimed to evaluate an antioxidant activity of the Acanthopanax senticosus homogeneous polysaccharide obtained in Example 1.

[0061] I. Determination of activity of scavenging DPPH free radical

[0062] 2 mL of sample solutions with different mass concentrations (12.5, 25, 50, 100 ug ml) were taken and respectively added with 2 mL of DPPH solution (100 ug ml"); and after sufficient mixing, reaction in the dark was performed for 30 min. An absorbance (4m) of the reaction system was measured at 517 nm. Meanwhile, a solvent blank group (4n, the DPPH solution was replaced by an equal volume of methanol) and a sample blank group (4o, a sample solution was replaced by an equal volume of methanol) were set. VC was used as a positive control group. The experiment was operated in parallel for 3 times, and a scavenging rate of the DPPH by the extract was calculated according to the following formula: scavenging rate % = (1 — Am=any x 100%. Ao

[0063] 2. Determination of activity of scavenging ABTS™

[0064] 0.4 mL of sample solutions with different mass concentrations (12.5, 25, 50, 100 pg ml) were taken and respectively added with 4 mL of ABTS" solution, reaction was performed for 6 min. An absorbance (47) of the sample was measured at 734 nm. Meanwhile, a solvent blank group (4j, the ABTS" solution was replaced by an equal volume of methanol), a sample blank group (4h, a sample solution was replaced by an equal volume of methanol), and a positive control group were set. The experiment was operated in parallel for 3 times, and a scavenging rate of the ABTS" by the extract was calculated according to the following formula: scavenging rate % = (1 - £4 X 100%.

[0065] 3. Determination of reducing power

[0066] 0.8 mL of sample solutions with different mass concentrations (12.5, 25, 50, 100 pg ml) were taken and added with 2 mL of a phosphate buffer solution (PH=6.6) and 2 mL of 1% potassium potassium ferricyanide; water bath was performed at 50°C for 20 min; 2 mL of 10% trichloroacetic acid was added; centrifugation was performed at 3000 rpm for 10 min; 2 mL of a supernatant was collected, and added with 2 mL of deionized water and 0.4 ml of 0.1% ferric chloride; reaction was performed for 5 min, and an absorbance was measured at 700 nm; and VC was taken as a positive control, and the experiment was operated in parallel for 3 times. The greater the measured absorbance, the stronger the reducing power.

[0067] Results were as follows. As shown in Tables 3 to 5, ICso values of the scavenging rate of the DPPH radical and the scavenging rate of the ABTS" by the Acanthopanax senticosus homogeneous polysaccharide were 3.17£0.57 ug-mL" and 15.26+5.79 ug'mL", respectively, and an ECso value of the reducing power was 36.02+10.89 pg-mL!, which showed that its antioxidant ability was stronger than that of positive medicine vitamin C. The difference was statistically significant (P< 0.01), indicating that the Acanthopanax senticosus homogeneous polysaccharide prepared in Example] had a relatively strong antioxidant activity. Table 3: Activity of scavenging DPPH free radical by the Acanthopanax senticosus homogeneous polysaccharide (n=6, x +s) Group Regression equation |r ICso / ug mL! | Acanthopanax | senticosus | y=3.572x+3.876 | 0.999 | 3.174057" * | homogeneous polysaccharide Vitamin C Vitamin C | Y=5.872X +1.483 0.999 6.78+0.96

[0068] Compared with vitamin C group, “p <0.05,and * “p<0.01. Table 4: Activity of scavenging ABST" by the Acanthopanax senticosus homogeneous polysaccharide (n=6, x ts) Group Regression equation | r ICso / ug mL! Vitamin C | Y=2.157x+7.624 0.997 | 34.2146.08 | Acanthopanax | senticosus | Y=1.024x+4.275 | 0.999 | 15,265.79" * | homogeneous polysaccharide

[0069] Compared with the vitamin C group, *P<0.05,and * *P<0.01. Table 5: Determination of reducing power of the Acanthopanax senticosus homogeneous polysaccharide (n=6, x +s) Group Regression equation | r ECso / ug mL! Vitamin C | Y=0.0068x+0.0047 | 0.999 | 68.47+11.22 | Acanthopanax | senticosus | ¥=0.0028%+0.0043 | 0.998 | 36.02£10.89* * | homogeneous polysaccharide

[0070] Compared with the vitamin C group, *P<0.05,and * *P<0.01.

[0071] Example 3: Preparation of essence lotion containing the Acanthopanax senticosus homogeneous polysaccharide

[0072] In this experiment, the Acanthopanax senticosus homogeneous polysaccharide obtained in Example] was used to prepare an essence lotion. Weight percentages of components and a production process are as follows: Raw materials Percentages (%) Suppliers | Phase A | Glyceryl monostearate | 6.0 | Guangzhou Huahua Chemical Industry Co., | | Ltd, China | Propylene glycol | 5.5 | Guangzhou Huahua Chemical Industry Co., | Ltd., China | Stearic acid | 4.0 | Guangzhou Huahua Chemical Industry Co., | Ltd., China | Triethanolamine [07 | Changzhou Wuming Chemical Industry Co., Ltd., China | Mineral oil | 10.0 | Guangzhou Huahua Chemical Industry Co., | | Ltd, China | Methyl 4-hydroxybenzoate | 15 | Shanghai Ruigu Biotechnology Co., Ltd., | | china | 1sopropy! myristate | 100 | Zhejiang Wumart Chemicals Co., Ld, | | china | Dimethyl siloxane | 20 | Changzhou Wuming Chemical Industry | Co., Ltd., China B phase | Acanthopanax senticosus 6.0 | Self-made homogeneous polysaccharide | Deionized water | 54.3 | self-made

[0073] A production process was as follows. The phase A and the phase B were respectively heated to 70°C under stirring until they were completely dissolved and mixed evenly, and then, the phase B was added to the phase A at 70°C to form a W / Q emulsion, after uniform stirring, cooling to room temperature to obtain the essence lotion.

[0074] Matrix components used in a preferred example of the present invention are as described above, and matrix components used in this example can exert the efficacy of a pharmaceutical composition of the present invention to the best. However, common matrixes produced by other manufacturers applicable to cosmetics may also be used in the present invention, so long as dosages thereof meets a national standard of cosmetic additives, which will not affect the effect of the present invention. Therefore, they are not enumerated.

[0075] A homogenizing emulsifying device used in the present invention is an FV-30L FISCO vacuum homogenizing emulsifying machine produced by Shanghai Fluko Fluid Machinery Manufacturing Co., Ltd., which has functions of homogenization, stirring, temperature control. Homogenizing emulsifying devices for cosmetic preparation produced by other manufacturers may also be used in the present invention. As long as these devices are strictly operated according to process parameters of the present invention, effects of the present invention can be achieved.

[0076] Example 4: Evaluation of anti-skin aging activity of essence lotion containing the Acanthopanax senticosus homogeneous polysaccharide

[0077] In this experiment, an anti-skin aging activity of the essence lotion containing the Acanthopanax senticosus homogeneous polysaccharide obtained in Example3 was evaluated.

[0078] 1 Material and method

[0079] 1.1 Experimental animals: 40 SPF female Kunming mice weighing (20+2) g each were purchased from Guangdong Medical Laboratory Animal Center, and had an experimental animal quality license No. 44005800003406; and the mice were bred and experiments on the mice were performed in an animal room of Sci-tech Industrial Park, Guangzhou University of Chinese Medicine (license No. SYXK (Guangdong) 2013-0014). Since an ultimate goal of this study was to develop anti-skin aging cosmetics suitable for women, all female mice were selected as experimental animals. The treatment of mice conformed to the principles of animal ethics.

[0080] 1.2 Material and reagent: an essence lotion containing the Acanthopanax senticosus homogeneous polysaccharide was the essence lotion prepared in Example3; D-galactose was from Beijing Solarbio Biotechnology Co., Ltd.; an HA assay kit was from Shanghai Enzyme linked Biotechnology Co., Ltd.; and an HYP assay kit, a SOD assay kit, and coomassie brilliant blue were from Nanjing Jiancheng Bioengineering Institute.

[0081] 1.3 Grouping and modeling: firstly, the female mice were bred adaptively for 7 days to ensure that the mice had adapted to a current environment and then the experiment began. The 30 female mice were divided into 3 groups according to a random number table. Two groups of the mice were used as a modeling group, and were injected with D-galactose subcutaneously at 1.0 g kg! d'! for 30 days totally. The remaining group of the mice as a blank group was injected with the same volume of normal saline every day. After 30 days, skin appearances of the mice in the modeling group were compared with those in the blank group. The modeling group showed obvious sagging skin and fine wrinkles, while the blank group showed opposite phenomena. Two groups of skin-aging model mice were divided into a model group and an Acanthopanax senticosus homogeneous polysaccharide group. Hair on backs of the mice was cut with scissors, and then the backs of the mice were shaved with a razor for later use.

[0082] 1.4 Mice skins externally applied with essence lotions: the mice in the Acanthopanax senticosus homogeneous polysaccharide group were applied with the essence lotion containing 6% of the Acanthopanax senticosus homogeneous polysaccharide obtained in Example3, while the mice in the model group were applied with an essence lotion without the Acanthopanax senticosus homogeneous polysaccharide. The specific method was as follows: an area of 4 cmx7 cm in the center of the back of each mouse was selected, and each essence lotion was applied onto the surface of the skin area selected from each mouse of the corresponding group; 0.3 g of the essence lotion was applied to each mouse per day; and the skin areas were cleaned after 24 h, and the essence lotions were applied again the same as the above; and these operations were last for 21 days, during which it was necessary to manually depilate 4 times.

[0083] 1.5 Observation of apparent characteristics of mice skins: apparent characteristics of the skins of the mice in each group, such as color, smoothness and wrinkles were compared, photographed and recorded. Then, the experimental mice were killed by a neck-removing method, and the skins of the application sites were quickly peeled off to remove subcutaneous fat and other connective tissues. After paving, the mice skins were cut at the middle positions with a hole punch having a diameter of 2 cm, so as to measure moisture contents, and the remaining skin of each mouse was frozen at -20°C for measuring skin hydroxyproline and other components.

[0084] 1.6 Determination of skin moisture content: a wet weight of the skin cut by the hole punch was weighed accurately, and then the skin was put into an oven and dried at 50°C for 12 h; and then, a dry weight of the skin was weighed; and a skin moisture content in each experimental group was calculated according to the following formula: a skin moisture content = (a wet weight-a dry weight) / the wet weight x 100%.

[0085] 1.7 Determination of skin hydroxyproline (HYP) content: 0.5 g of a skin tissue at the application site was taken, rinsing was performed on the skin tissue with physiological saline precooled by an ice bath, and the skin tissue was dried with filter paper; and the physiological saline precooled by the ice bath was added, and the skin tissue was ground by a glass homogenizer into a homogenate with a concentration of 10%. The obtained homogenate was centrifuged at 3,000 r / min for 10 min at 0°C, and a supernatant was collected. According to a method shown in instructions of an HYP kit, an OD value was measured by ultra-micro microplate spectrophotometer, and a HYP content in the skin of the mouse in each experimental group was calculated.

[0086] 1.8 Determination of skin hyaluronic acid (HA) content: 0.5 g of a skin tissue at the application site was taken, and a PBS buffer solution precooled by ice bath was added; and the skin tissue was ground by the glass homogenizer into a homogenate with a concentration of 10%. The obtained homogenate was centrifuged at 1,000 r / min for 4 min at 0°C, and a supernatant was collected. According to a method shown in instructions of an HA kit, an OD value was measured by the ultra-micro microplate spectrophotometer, and an HA content in the skin of the mouse in each experimental group was calculated.

[0087] 1.9 Determination of skin superoxide dismutase (SOD) activity: 0.5 g of a skin tissue at the application site was taken, and was rinsed by the physiological saline precooled by an ice bath, and then, the physiological saline precooled by the ice bath was added; and the skin tissue was ground by the glass homogenizer into a homogenate with a concentration of 10%. The obtained homogenate was centrifuged at 3,000 r / min for 10 min at 0°C, and a supernatant was collected. According to a method shown in instructions of an SOD kit, an OD value was measured by the ultra-micro microplate spectrophotometer, and an SOD activity in the skin of the mouse in each experimental group was calculated.

[0088] 1.10 Statistical method: SPSS18.0 statistical software was used to analyze data, and measurement data was represented by ¥ ts; single factor analysis of variance was used for comparison between groups; and Dunnett T3 test was used for pairwise comparison if results of homogeneity test for variance were significant, and LSD test was used for pairwise comparison if the results of homogeneity test for variance were insignificant, with the difference of P < 0.05 being statistically significant.

[0089] 2 Results

[0090] 2.1 Comparative observation on skin appearances of mice in each group: compared with the blank group, the mice in the model group had sagging skin and a large number of wrinkles, and were slower in hair regeneration; and compared with the model group, the mice applied with the essence lotion containing 6% of the Acanthopanax senticosus homogeneous polysaccharide had obvious reduction in skin wrinkles and obvious improvement in smoothness and elasticity.

[0091] 2.2 Effects of the Acanthopanax senticosus homogeneous polysaccharide on skin moisture content, HYP content, HA content and SOD activity of mice: see Table 6 for the measurement results of the skin tissue moisture contents, the HYP contents, the HA contents and the SOD activities of the mice in three groups. The skin tissue moisture content, HYP content, HA content and SOD activity of the mice in the model group were significantly lower than those in the blank group (P < 0.01), indicating that the skin aging model of the mice was successfully established. Compared with the model group, the skin moisture content, HYP content, HA content and SOD activity of the mice in the Acanthopanax senticosus homogeneous polysaccharide group were increased significantly, with the difference being statistically significant (P < 0.01). Compared with the blank group, there were no significant differences (P > 0.01) in the skin moisture content, HYP content, HA content and SOD activity and other indexes of the mice in the Acanthopanax senticosus homogeneous polysaccharide group. Table 6: Effects of the Acanthopanax senticosus homogeneous polysaccharide on skin tissue moisture content, HYP content, HA content and SOD activity of mice (n=6, x *s) | Group | Skin moisture | HYP content | HA content | SOD activity | content (%0) (ng / mg) (ug / ml) (U / mg) Blank group 78.21£1.53%% | 4312021%° 10.24£0.86% | 386.12+21.47%° | Model group | 50832121 | 3.65019 | 6772093 | 3025541732 | Acanthopanax | 76.3381.24 | 4.2020.28° | 101420912 | 374.08226.64° | senticosus | homogeneous | polysaccharide group F value 374.12 14.86 263.86 41.28 P value 0.000 0.000 0.000 0.000 | Back test (pairwise | LSD | Dunnett T3 | Dunnett T3 | LSD comparison) Co

[0092] Compared with the model group, “P< 0.05, and ““P<0.01.

[0093] In summary, the results of this experiment showed that the skins of the mice in the blank group were smooth, relatively firm and elastic. The mice injected with D-galactose in the skin aging model had saggingskins, greatly increased wrinkles, and the decreased skin moisture content, hydroxyproline content, hyaluronic acid content, superoxide dismutase activity and other indexes. Through determination, the effect of the improvement of the skin appearances of the model mice externally applied with the essence lotion containing 6% of the Acanthopanax senticosus homogeneous polysaccharide was obvious, and the indexes such as the skin moisture content, hyaluronic acid content, hydroxyproline content and superoxide dismutase activity of each mouse were also significantly improved.

[0094] Finally, it is necessary to explain herein that the above Example sare only used to further describe the technical solutions of the present invention, and should not be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made by those skilled in the art according to the above of the present invention are all within the scope of protection of the present invention.

Claims

CLAIMS ‘What is claimed is:

1. An Acanthopanax senticosus homogeneous polysaccharide, having a molecular weight of 6.83x10°Da, and consisting of arabinose, galactose, glucose, mannose and xylose, with molar percentages of all the monosaccharides sequentially being 16.42%, 32.27%, 40.38%, 7.21% and 3 72%.

2. A preparation method of the Acanthopanax senticosus homogeneous polysaccharide according to claim 1, comprising the following steps: 1) crushing dried Acanthopanax senticosus decoction chips to a medicinal powder, sieving, adding water 5 to 8 times the weight of the sieved medicinal powder, extracting for 3 times at 80°C to 100°C for 2 h each time to obtain extract solutions, combining the extract solutions and centrifuging the combined extract solutions, collecting a supernatant, and concentrating the supernatant to obtain a concentrated solution; 2) after the concentrated solution is cooled, adding a a-amylase until a weight content thereof is 0.1% to 0.4%, adjusting a pH value to 7.0, and performing enzymolysis in a water bath at 60°C until a solution has no color change when the solution meets an iodine-potassium iodide reagent, quickly heating up to 100°C and keeping for 5 min for enzyme deactivation, centrifuging, and collecting a supernatant; 3) mixing the supernatant collected in step 2) with Sevage reagent according to a volume ratio of 1: 1, shaking violently for 30min, standing for 12 h, collecting an upper polysaccharide solution, mixing the upper polysaccharide solution with the Sevage reagent according to a volume ratio of 1: 1, and repeating the above operations until no protein characteristic absorption peak appears in ultraviolet scanning; 4) after the upper polysaccharide solution finally collected in step 3) is concentrated, adding absolute ethanol 4 to 6 times the volume of the concentrated upper polysaccharide solution, standing at 4°C for precipitation for 48 h, centrifuging, and collecting a precipitate; adding anhydrous ethanol to the precipitate, the above operations are repeated for 3 times, followed by freeze-drying so as to obtain an Acanthopanax senticosus crude polysaccharide powder; 5) after the Acanthopanax senticosus crude polysaccharide powder obtained in step 4) is completely dissolved in distilled water, separating by means of a DEAE Fast Flow ion chromatographic column, wherein elution conditions are as follows: a flow rate is 2.5 mL / min, and pure water, sodium chloride solutions with0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.4 mol / L and 1 mol / L are sequentially used for elution; performing tracking detection by means of a sulfuric acid-phenol method; collecting eluents; 6) after the eluents collected in step 5) are concentrated, separating again by means of a Sephadex G-200 glucan gel column chromatographic column, eluting with the distilled water at a flow rate of 0.5 mL / min, and after detection by a phenol-sulfuric acid method, collecting a main peak part in an elution curve; 7) after a solution of the main peak part in the elution curve collected in step 6) is concentrated, dialyzing for 2 days by means of a dialysis bag with a molecular weight cutoff of 3,500 Da for desalination, and finally concentrating and freeze-drying a solution in the dialysis bag to obtain andcanthopanax senticosus homogeneous polysaccharide powder.

3. The preparation method of the Acanthopanax senticosus homogeneous polysaccharide according to claim 2, wherein in the Sevage reagent, chloroform: n-butanol is equal to 4:

1.

4. The preparation method of the Acanthopanax senticosus homogeneous polysaccharide according to claim 1, comprising the following steps: 1) crushing dried Acanthopanax senticosus decoction chips to a medicinal powder, sieving with a 100-mesh sieve, extracting the sieved medicinal powder with water 5 to 8 times the weight of the medicinal powder for 3 times at 80°C to 100°C for 2 h each time to obtain extract solutions, combining the extract solutions, centrifuging the combined extract solutions at 3000 rpm for 20 min, then collecting a supernatant, and concentrating the supernatant by rotary evaporation to one-fifth of an original volume of the supernatant to obtain a concentrated solution; 2) after the concentrated solution is cooled, adding a a-amylase until a weight content thereof is 0.1% to 0.4%, adjusting a pH value to 7.0, and performing enzymolysis in a water bath at 60°C for 4 h where a solution has no color change when the solution meets an iodine-potassium iodide reagent; quickly heating up to 100°C and keeping for 5 min for enzyme deactivation, then centrifuging at 3000 rpm for 10 min, and collecting a precipitate; 3) mixing the supernatant collected in step 2) with Sevage reagent according to a volume ratio of 1: 1, shaking violently for 30min, standing for 12 h, collecting an upper polysaccharide solution, mixing the upper polysaccharide solution with the Sevage reagent according to a volume ratio of 1: 1, and repeating the above operations until no protein characteristic absorption peak appears in ultraviolet scanning, wherein the Sevage reagent is prepared by mixing chloroform and n-butanol according to a volume ratio of 4:1; 4) after the upper polysaccharide solution finally collected in step 3) is concentrated, adding absolute ethanol 4 to 6 times the volume of the concentrated upper polysaccharide solution, standing at 4°C for precipitation for 48 h, centrifuging at 3000 rpm for 10 min, and collecting a precipitate; adding anhydrous ethanol to the precipitate; repeating the above operations for 3 times to obtain a final precipitate, and freeze-drying the final precipitate to obtain an Acanthopanax senticosus crude polysaccharide powder; 5) after the Acanthopanax senticosus crude polysaccharide powder obtained in step 4) is completely dissolved in distilled water, separating by means of a DEAE Fast Flow ion chromatographic column, wherein elution conditions are as follows: a flow rate is 2.5 mL / min, and pure water, sodium chloride solutions with 0.05 mol / L, 0.1 mol / L, 0.2 mol / L, 0.4 mol / L and 1 mol / L are sequentially used for elution; collecting eluents in gradient by means of an automatic collector, wherein an volume of each solution in gradient elution is three times a column volume, and 30 tubes, each of which contains 5.0 mL eluent are collected; performing tracking detection every other tubeby means of a sulfuric acid-phenol method; 6) after the eluents collected in step 5) are concentrated, separating again by means of a Sephadex G-200 glucan gel column chromatographic column, eluting with the distilled water at a flow rate of 0.5 mL / min, colleting by means of an automatic collector, each tube containing 5.0 mL eluent, and after detection by a phenol-sulfuric acid method, collecting a main peak part in an elution curve; 7) after a solution of the main peak part in the elution curve collected in step 6) is concentrated, dialyzing for 2 days by means of a dialysis bag with a molecular weight cutoff of 3,500 Da for desalination, and finally concentrating and freeze-drying a solution in the dialysis bag to obtain andcanthopanax senticosus homogeneous polysaccharide powder.

5. Use the Acanthopanax senticosus homogeneous polysaccharide powder according to claim 1, wherein the Acanthopanax senticosus homogeneous polysaccharide powder is used for preparing a skin care cosmetic with an anti-skin aging effect or a therapeutic medicine for skin.

6. A skin care cosmetic, comprising: the Acanthopanax senticosus homogeneous polysaccharide powder according to claim 1, and an auxiliary material used in a cosmetic field.

7. A therapeutic medicine for skin, comprising: the Acanthopanax senticosus homogeneous polysaccharide powder according to claim 1, and a medically-acceptable carrier.

Images