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     Vitamin B6(Pyridoxine Hydrochloride)

Molecular Formula:C8H11NO3.HCl Molecular Weight: 205.64
Structural formula:
This product is 6-methyl-5-hydroxy-3,4-pyridine-bis(methanol)-hydrochloride. Counted as desiccated material, it contains over 99.0% of C8H11NO3.HCl.
[Properties] This product is white or white-like crystal or crystal powder, which is inodorous, and tastes sour and bitter;it gradually deteriorates when exposed the sunlight.
This product is readily soluble in water and slightly soluble in ethanol, and non-soluble in chloroform and aether.
Smelting Point: The smelting point of this product is 205-209,and it decomposes when smelting.
(1)Take about 10mg of this product and add 100 ml of water to solve it. Put 1 ml of the solution into the test tube A and B with 2 ml 20% sodium acetate solution respectively, and put 1 ml water and 4% boric acid solution into test tubes A and test tube B respectively; evenly mix the solution and quickly add 1 ml chloro-imido-2,6-dichloro-chinone. The test tube A will appear blue and become red after a few minutes, and the blue color will not appear in test tube B.
(2)Add this product into hydrochloric acid solution (9-1000) to make 10µg/ml solution and assay it with spectrophotometer. There will be maximal absorption at the 291 nm wavelength with the absorptivity of about 0.43.
(3)The absorbing atlas of infrared ray of this product conforms to the controlling atlas.
(4)he identifying reaction for chloride in the water solution of this product.
Clarity of the solution:
After solving 1.0 g of this product in 10 ml water, the solution should be clarified; if appearing turbid, compare it with No.1 turbidity standard solution and it should be thinner.
Acidity: Solve 1.0g of this product in 10 ml water and assay it. pH should be 2.4-3.0.
Weight Loss of Desiccation: Desiccate this product at 105 to constant weight. The weight loss should not be over 0.2% and the burned residue not over 0.1%.
Heavy Metal: Add 2.0 g of this product in 20ml water and after added with ammoniac solution it should appear neutral reaction in litmus paper test.
[Content Assay] Precisely measure this product with the error permission of 0.15 g and add 20ml ice acetic acid and 5 ml mercury acetate. Mildly melt it and cool it. Add 1 drop crystal purple indication liquid and titrate the solution with the titrating solution of perchloric acid until bluish green and correct the titrating result with blank test. One ml titrating solution of perchloric acid equal to 20.56mg C8H11NO3.HCl.
[Type ] Vitamin-type drug.
[Storage] Hermetically sealed and stored in dark place.
[Preparation] (1)Vitamin B6 tablet, (2)Vitamin B6 Injection

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