title: Simultaneous determination of ascorbic acid, pyridoxine hydrochloride, and tyrosine by derivative UV spectrophotometry.
abstract: A new UV spectrophotometric method for resolving a three-component drug mixture of ascorbic acid (I), pyridoxine hydrochloride (II), and tyrosine (III), on the basis of the first-derivative UV spectra and zero-crossing technique, is described. Beer's law was obeyed in the concentration range of 7.0-15.0, 0.25-1.0, and 8.0-40.0 micrograms/ml for I, II, and III, respectively. Lower limits of detection at the 95% confidence level were 2.88, 0.69, and 5.43 micrograms/ml, respectively. The advantages of the proposed method (speed, easy sample preparation, and lower cost per analysis) also include its application to the content uniformity and dissolution test of a three-component mixture of drugs.
authors.affiliation: Institute of Chemical and Pharmaceutical Research, Bucharest-3, Romania.
authors.forename: M
authors.initials: M
authors.lastname: Surmeian
mesh_terms: D001205:Ascorbic Acid / Q000032:analysis*; D002138:Calibration; D011736:Pyridoxine / Q000032:analysis*; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D013608:Tablets, Enteric-Coated; D014443:Tyrosine / Q000032:analysis*
chemical_list: D013608:Tablets, Enteric-Coated; D014443:Tyrosine; D011736:Pyridoxine; D001205:Ascorbic Acid