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This book demonstrates the potential of 1,2-Naphthoquinone-4-sulphonic acid sodium salt (NQS) as an analytical reagent for the analysis of pharmaceutical drugs bearing amine group in their pharmaceutical formulation. Simple, fast and reliable spectrophotometric methods were developed and validated for the determination of various pharmaceuticals bearing amine group ,cephalosporin, fluoroquinolones, cardiovascular drugs and antimalarial. Different variables affecting the reactions between the NQS and the drug bearing amine group such as pH, concentration of NQS, temperature, and...