Nucleophilic attack Fourier transform infrared spectroscopy 6 pH 6 Amino acids 4 Article 4 Kinetics 4 Nitrogen Oxides 4 Oxidation-Reduction 4 Oxygen 4 Reaction intermediates 4 Reaction kinetics 4 chemistry 4 kinetics 4 nitrogen oxide 4 nucleophilicity 4 oxidation reduction reaction 4 3-mercaptopropionic acid 2 Absorbance-time curves 2 Acid catalyst 2 Addition reactions 2 Alcohols 2 Alkoxyl radicals 2 Amino group 2 Animals 2 Anodic oxidation 2 Anticancer drug 2 Aprotic solvents 2 Ascorbic Acid 2 Autooxidation 2 Biological media 2