Abstract

Glycerol stabilizes cyanocob(lll)alamin (vitamin B12) against anaerobic photolysis by a high-intensity UV light source or a low-intensity fluorescent light source. The likely mechanism for stabilization by viscosigens is a decrease in diffusion and an enhancement of radical-pair recombination. Glycerol (25% or greater) stabilizes therapeutic doses of vitamin B12 in single-dose Tubex injection vials against adventitious photolysis by fluorescent light.

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