Observations on the Velocity of the Photo-Oxidation of Proteins and Amino-Acids

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Abstract
A large number of proteins take up O2 when exposed to the radiations of the mercury arc; gelatin is an exception. Most amino-acids are insensitive to these radiations, but tryptophan and tyrosine absorb O2 at a rapid rate in the light of the mercury vapor lamp. Cystine is quite stable (insoluble), but cysteine takes up O2 so rapidly in the dark that the acceleration produced by light is small and negligible when compared with that of tryptophan and of tyrosine.

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