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Stability of Vitamins in Pharmaceutical Preparations
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absorbance accurately weighed acid solution adjusted to pH alcohol aliquot amount of vitamin Anal anhydrous Apparatus aqueous solution ascorbic acid assay sample assay solution containing basal medium benzene biotin blank buffer calcium pantothenate calibration curve capsules centrifuged ceric sulphate Chem chloride chloroform choline chromatography Colorimetric determination colour column concentration curve is prepared cyanide cyanocobalamin determination of vitamin distilled water filtrate folic acid followed grams hydrochloric acid interfere liquid litre menadione mg/ml milligrams millilitres mixture ml of water ml per minute ml portions ml volumetric flask ml with water multivitamin preparations nicotinamide nicotinic obtained oxidation panthenol petroleum ether Pharm pharmaceutical preparations phosphate Polarographic potassium Preparation of Assay procedure reaction reagent Reagent grade riboflavin room temperature sodium bisulphite sodium hydroxide solution is added solution is diluted solvent Spectrophotometric Spectrophotometric determination standard solution sulphuric acid tablets thiamin hydrochloride thin-layer titration tocopherol tube U.S.P. reference standard ultraviolet vitamin B12 volumetric flask washed xg/ml