Vitamin C, also known as ascorbic acid L-, English name: Ascorbic Acid [3] CAS No.: 50-81-7 EINECS No.: 200-066-2 Molecular Weight: 176.13 IUPAC name: 2,3,4,5,6 pentahydroxyhexyl 2-hexenoic acid 4-lactone, acidic, having a strong reduction, heat or in solution decompose easily oxidized, and more susceptible to oxidation under alkaline conditions, for hexose derivative. Determination of Vitamin C 1) Iodimetry C6H8O6 (vitamin C, ascorbic acid) + I2 (iodine) = C6H6O6 (dehydroascorbic acid) + 2HI (hydrogen iodide) five-membered ring hydroxyl dehydrogenation. 2) 2,6 Dichlorophenolindophenol titration calibrated 2,6 Dichlorophenolindophenol a 1% solution of oxalic acid in vitamin c extract titrated with, when you reach the end point of titration, the solution will no color (or white) to light red. Vitamin C is a water soluble vitamin. Vitamin C in food is absorbed on the segment of the small intestine. Once absorbed, the body will be distributed to all of the water-soluble structure, normal adult metabolic activity in the body of vitamin C in the pool about 1500mg of vitamin C, the highest peak storage 3000mg vitamin C. Under normal circumstances, the vast majority of the vitamin C in the body or metabolized decomposed into oxalic acid combined with sulfuric acid to form ascorbic acid-2-sulfatase from the urine; another part directly from the urine in vitro, in vivo activity of vitamin C in the form of ascorbic acid. 25KG 25KG barrel or box, along with the whole package from the set, reference price 38 yuan KG large price negotiable