Rapid identification of commonly used feed additives

Rapid identification of commonly used feed additives

First, the identification method of vitamin A Vitamin A naked eye or grayish yellow particles. Take a sample of 0.1g, wet it with absolute ethanol and grind it, dissolve it, add chloroform 10ml, and then add 0.5ml of chloroform solution of antimony trichloride. If the solution shows blue first and fades immediately, it proves to be vitamin A. Second, the identification of vitamin E Vitamin E appearance of white or light yellow powder. Take 15 mg of the sample, add 10 ml of absolute ethanol to dissolve it, add 2 ml of nitric acid, shake and heat for 15 minutes, and dissolve orange-red. Third, vitamin K3 Vitamin K3 is a white or gray-brown crystal powder with a white appearance. Take 0.1 g of sample, add 10 ml of water 9 to dissolve, and add 3 ml of sodium carbonate solution to produce a genuine yellow precipitate. Fourth, vitamin B1 Vitamin B1 appearance of white crystal or crystalline powder, slightly odor, slightly bitter. Take 0.1g sample, add a little water to shake, filter, add 3 drops of iodine reagent in the filtrate, brown red precipitate. 5. The appearance of vitamin B2 is yellow to orange-yellow crystalline powder with bitter odor. Take 0.5 g sample, add a little water to dissolve, extract the supernatant, add 2 drops of dilute hydrochloric acid or sodium hydroxide test solution, yellow fluorescence in the supernatant. disappear. Sixth, ferrous sulfate to take 0.1 grams of sample, dissolved in 10 ml of water, take its solution by adding 2-3 drops of 10% iron potassium chloride solution, generate a dark blue precipitate, add a few drops of diluted hydrochloric acid, the precipitate is not easily dissolved as authentic. Seven, magnesium sulfate to take a sample of 1 g, dissolved in 10 ml of water, add ammonia, a white precipitate, add appropriate amount of ammonium chloride precipitation will dissolve. Add 5% disodium hydrogen phosphate solution, a white precipitate formed, insoluble after adding ammonia, it proved to be genuine.

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