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Abstract Antioxidants have a great importance in prevention and treatment of many diseases. In this thesis, new methods have been developed for the determination of mixtures containing antioxidants in there pure form and pharmaceutical dosage forms. Mixtures studied were: Cefixime trihydrate/Erdosteine, Ambroxol hydrochloride/Guaifenesin, Bromhexine hydrochloride/Guaifenesin and Ambroxol/Theophylline/Guaifenesin. Analytical methods developed for their determination were: HPLC-UV, HPLC-MS/MS, TLC-densitometric and UV spectrophotometric methods |