Dye-sensitized selective photo-oxidation of cysteine.

@article{Jori1969DyesensitizedSP,
  title={Dye-sensitized selective photo-oxidation of cysteine.},
  author={Giulio Jori and Guido Galiazzo and Ernesto Scoffone},
  journal={International journal of protein research},
  year={1969},
  volume={1 4},
  pages={
          289-98
        }
}
The phtalein derivative cresol red and the fuchsin dye crystal violet have been found to sensitize the selective photo-oxidation of cysteine, both free and incorporated into a protein. The specificity for cysteine of these dyes was checked in aqueous solution over the pH range 2.5-9, as well as in aqueous acetic acid. In acidic solutions, cysteine is quantitatively converted to cysteic acid; on the contrary, in neutral or alkaline media, the photo-oxidative process is competed by a dark… 
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