In view of the current status of more and more counterfeit astragalus polysaccharide powders, the following two methods of physical and chemical detection are used to identify astragalus polysaccharides as follows. Gds China feed industry information network - based on feed, serving livestock

The first method is the physical identification method, which is to identify the physical properties of Astragalus polysaccharides from the perspective of sight, smell, taste, touch and dissolution. Gds China feed industry information network - based on feed, serving livestock

The first is hope, hope is to look at the color of astragalus polysaccharide powder, according to pig e network users understand that the real astragalus polysaccharide powder should be light yellow powder, with hygroscopicity, if you put the bottle up and down shaking when there may be wall phenomenon, if The fake astragalus polysaccharide powder is added with glucose powder, then the astragalus polysaccharide powder can be seen on the flattened white paper with white particles; if the maltodextrin complex is added, the color of the astragalus polysaccharide powder is expressed as deep yellow. Gds China feed industry information network - based on feed, serving livestock

Followed by smell, smell is the smell of astragalus polysaccharide powder, because the astragalus polysaccharide powder is extracted from the plant jaundice, so the real astragalus polysaccharide powder can smell the smell of grass, while the fake astragalus polysaccharide powder is mostly added to the chemical Ingredients often smell the smell of grass. Gds China feed industry information network - based on feed, serving livestock

Once again taste, taste is to taste it taste, astragalus polysaccharide is literally sugar, seems to be sweet, but in fact only monosaccharides have sweetness, and astragalus polysaccharides are polysaccharides, it does not have sweetness, if The sucrose complex is added to the counterfeit astragalus polysaccharide powder to taste the sweetness. Gds China feed industry information network - based on feed, serving livestock

The fourth is touch, that is to say, touch the touch of Astragalus polysaccharide powder. The real astragalus polysaccharide powder just feels smooth and delicate when it is touched by hand. However, because it has hygroscopicity, it will soon feel like a hand. The counterfeit astragalus polysaccharide powder, due to the addition of other ingredients, often exhibits no hygroscopicity or no significant hygroscopicity, and does not have the feeling of sticking hands. Gds China feed industry information network - based on feed, serving livestock

The last point is dissolution, dissolution refers to solubility, astragalus polysaccharide powder in the jaundice determines its solubility is good, there will be no precipitation of insoluble components, but the dissolution rate is relatively slow, if the astragalus polysaccharide powder added sucrose complex, glucose Compounds, maltodextrin complexes, dextrins, water-soluble starch complexes, and other substances, will appear too fast dissolution rate, and there may be insoluble precipitation material. Gds China feed industry information network - based on feed, serving livestock

In addition, after dissolving Astragalus polysaccharide powder, a lot of foam appears due to the saponin component contained therein, while the fake Astragalus polysaccharide powder has little or no foam. In addition to this, it can be seen that the real astragalus polysaccharides dissolve slowly, but can be completely dissolved, while the counterfeit astragalus polysaccharides dissolve faster, but the dissolved bottom of the container often has insoluble substances. Gds China feed industry information network - based on feed, serving livestock

The second method is a chemical identification method. There are three chemical identification methods, ie, alcohol precipitation (80%), high-heat (350°C), and high-performance thin-layer chromatographic method. Commonly used are alcohol precipitation and high-heat methods. High-performance thin-layer chromatography is used to identify instruments. And operator requirements are higher and are not commonly used at the grassroots level. Gds China feed industry information network - based on feed, serving livestock

The first is the 80% alcohol alcohol precipitation method. Its principle is to use different alcohol concentrations to precipitate substances of different molecular weights. For example, 50% alcohol can precipitate proteins, starches, mucilage, pectin and other macromolecules (solutions Visible or yellow precipitated substances); 80% of alcohol can precipitate active astragalus polysaccharides (appear milky white flocculation, which is the national standard for three new veterinary drugs); more than 90% alcohol can precipitate glucose and sucrose . Gds China feed industry information network - based on feed, serving livestock

It is desirable to take 10 g of astragalus polysaccharide powder into a beaker, add water to dissolve in 20 ml of water, and then add 80 ml of ethanol and stir to settle. The supernatant is light brown and there is a lot of precipitate at the bottom, and it aggregates into clusters, indicating the sample. That is to say, astragalus polysaccharide without added glucose; if there are few precipitates, it means that the astragalus polysaccharide powder is doped with glucose. Gds China feed industry information network - based on feed, serving livestock

After placing the above liquid in a refrigerator at 4° C. for about 2 hours, milky white flocculation appeared at the bottom of the Astragalus polysaccharide solution, and the pseudo-astragalus polysaccharide solution only showed turbidity and no precipitate was formed. Finally, the standing solution was poured out, and the flocculent precipitate in the Astragalus polysaccharide solution was poured out with the liquid, and no precipitate adhered to the bottom of the bottle. The pseudo-astragalus polysaccharide had a precipitate attached to the bottom of the bottle (breakage occurred when extracting Astragalus polysaccharides). , did not remove protein pectin, mucus and other impurities), or simply no precipitate. Gds China feed industry information network - based on feed, serving livestock

Followed by high fever method, high fever method is to take right amount of astragalus polysaccharide powder heated at 350 °C under high temperature for 2 hours, to be cooled, the residue should be hard lump, if the astragalus polysaccharide contains glucose, then in 350 °C dry heat conditions, After 2 hours, it shows a honeycomb, which can also be used to identify the authenticity of Astragalus polysaccharides. Gds China feed industry information network - based on feed, serving livestock

The last method is high-efficiency thin-layer chromatographic method. This is the most effective method to identify Astragalus polysaccharides. By judging the thin spots, you can identify the authenticity of the sample, that is, the authentic Astragalus polysaccharide powder in the chromatogram of the test sample. At the position corresponding to the chromatogram of the reference substance, fluorescent spots of the same color should be displayed. Gds China feed industry information network - based on feed, serving livestock

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