The methylene blue-D-glucose-O2 system. Oxidation of D-glucose by methylene blue in the presence and the absence of oxygen

Abstract

Quasi-oscillations in [O2] were observed during the methylene blue catalyzed oxidation of D-glucose by O2 in alkaline aqueous solutions. The kinetics of anaerobic oxidation of D-glucose (GH) by methylene blue (MB+) was investigated in a closed system. The reaction was first order with respect to the concentration of methylene blue and the observed rate constant increased with GH concentration in a saturated mode. The oxidation proceeds via complex formation between GH and MB+ and the rate constant of the decay of the complex was determined. The oxidation process was also investigated under aerobic conditions and the reaction rates and reaction orders were determined by spectrophotometric measurements of the disappearance of MB+ and by amperometric determination of O2 consumption. © 1999 John Wiley & Sons, Inc. Int J Chem Kinet 31: 463–468, 1999