Effect of ascorbic acid on the degradation of cyanocobalamin and hydroxocobalamin in aqueous solution: a kinetic study.

The degradation kinetics of 5 × 10(-5) M cyanocobalamin (B12) and hydroxocobalamin (B12b) in the presence of ascorbic acid (AH2) was studied in the pH range of 1.0-8.0.

Effect of nicotinamide on the photolysis of cyanocobalamin in aqueous solution.

The photolysis of cyanocobalamin by visible light in the presence of nicotinamide at pH 1.0-7.0 has been studied.