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Abstract The thesis consists of three chapters: Chapter I: general introduction, chemical structure, physical and chemical properties of compounds which are used in this work, , apparatus, literature review, aim of work. Chapter II: Simultaneous determination of some common food colorants in various commercial products present in the Egyptian market by Reversed-Phase High Performance Liquid chromatography and Liquid chromatography-Electrospray Tandem Mass Spectrometry Chapter III: Titanium dioxide content in food stuffs from the Egyptian market: Quantitative analysis using Inductively Coupled Plasma Optical Emission Spectrometry and Inductively Coupled Plasma Mass Spectrometry systems |