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Vitamin B6 (Pyridoxine hydrochloride)
Pyridoxine hydrochloride is a white, crystalline powder, practically odourless. The dry substance is sufficiently stable in air. With prolonged exposure to day light and UV light, it will change gradually. Pyridoxine hydrochloride is easily soluble in water. A 10% (w/v) aqueous solution shows a pH of about 3.0. Pyridoxine hydrochloride is moreover soluble in 95% ethanol. It is slightly soluble in acetone and practically insoluble in ether. The melting point is 206-212°C. Aqueous solutions of pyridoxine hydrochloride are incompatible in particular with oxidants, metal ions as well as day light and UV light.
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