Studies of vitamin C antioxidative activity in the N-oxide surfactant solutions

► In the solutions containing N-oxides vitamin C undergoes atmospheric oxidation more readily than in pure water. ► Up to the very low AA concentration zero order kinetics is observed suggesting heterogeneous catalytic reaction. ► At higher pH more AA molecules are present in the form of ascorbate monoanion which undergoes oxidation much more readily. ► MEDA is the most effective promoter of AA oxidation.