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Riboflavin-sensitized photoprocesses of tryptophan






Journal of Photochemistry & Photobiology B Biology 23(1): 43-48

Riboflavin-sensitized photoprocesses of tryptophan

The photodegradation of tryptophan in oxygen saturated aqueous solution sensitized by riboflavin is accompanied by the generation of the following reactive oxygen species: 1O-2, OH., H-2O-2 and O-2.-. When parallel photodegradation experiments are run with 14C-riboflavin in one case and 14C-tryptophan in the other and the irradiation products are separated by Sephadex G-15 and C-18-HPLC, the generation of the following species is detected: aggregate forms of riboflavin, indolic products associated to flavins, indolic products of molecular weight higher than tryptophan, formylkynurenine, and other tryptophan photodecomposition products. The significance of the riboflavin anion radical and tryptophan cation radical as intermediates in the photoproduct formation is discussed.

Accession: 009359795

PMID: 8021750

DOI: 10.1016/1011-1344(93)06984-b

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Silva E.; Rueckert V.; Lissi E.; Abuin E., 1991: Effects ph and ionic micelles on the riboflavin sensitized photoprocesses of tryptophan in aqueous solution. The effects of pH and ionic micelles on the rates of product formation following irradiation of riboflavin in the presence of tryptophan were investigated by absorption and fluorescence spectroscopy. Under anaerobic conditions, formation of ribofl...

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