Physical and chemical testing parameters detection of health food

A. 1. Generally, the reagents and water used in this standard refer to analytical pure reagents and Grade III water specified in GB/T 6682-2008, unless other requirements are specified. The standard titration solution, impurity determination standard solution, formulation, and product used in the experiment shall be prepared in accordance with the provisions of GB/T 601, GB/T 602, and GB/T 603 unless otherwise specified. The solution used in the experiment refers to aqueous solution when no specific solvent is specified for preparation. A. 2 Identification test A.2.1 Take 2 mL of 0.5% ethanol solution of the sample and place it in a test tube. Add 1-2 drops of 5% cadmium chloride ethanol solution to produce a white precipitate. A. 2.2 Take 2 mL of 10% ethanol solution from the sample and place it in a test tube. Add 1-2 drops of bismuth potassium nitrate solution (take 8g of bismuth nitrate and add 20 mL of nitric acid to dissolve it; take 27.2g of potassium iodide and add 50 mL of water to dissolve it. Combine the above two solutions and dilute to 100 mL with water), resulting in a brick red precipitate. A. Determination of n-hexane insoluble substances A.3.1 Reagents and materials n-hexane. A. 3.2 Instruments and Equipment A.3.2.1 Suction Filter: 500 mL. A. 3.2.2 Glass sand core volute: G3. A. 3.3 Analysis Step A.3.3.1 Bake the cleaned snail in an oven at 101 ℃~105 ℃ to constant weight. A. 3.3.2 Weigh 10.0 g of a uniformly mixed sample, accurate to 0.0001 g, and place it in a beaker. Add about 100 mL of n-hexane, stir and dissolve it with a glass rod, and then filter through a constant weight cyanobacterium. A. 3.3.3 Wash the beaker and glass rod twice with 25 mL of n-hexane and transfer all insoluble substances into the sieve. Wash the inner wall and insoluble substances with n-hexane, and finally try to remove the residual n-hexane from the sieve as much as possible. A. 3.3.4 Remove Gandun and wipe the outer wall of the cochlea with a small amount of n-hexane dipped in degreased cotton. Dry the ground snail in an oven at 101 ℃~105 ℃ for 1 hour, take it out, cool it in a dryer to room temperature, and weigh it. Dry for another 20 minutes, cool, weigh until constant weight

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