Effects of 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 riboflavin-tryptophan adducts was inhibited in acid solutions and by the addition of anionic (sodium dodecylsulphate) and cationic (cetyltrimethylammonium bromide) micelles. The oxidation of tryptophan photoinduced by riboflavin was considerable faster in basic solutions.
Silva
E
E
Facultad de Quimica, Pontificia Universidad Catolica de Chile, Santiago.
Rückert
V
V
Lissi
E
E
Abuin
E
E
D000077286:Cetrimonium; D002593:Cetrimonium Compounds; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008823:Micelles; D010084:Oxidation-Reduction; D010777:Photochemistry; D012256:Riboflavin / Q000528:radiation effects; D012967:Sodium Dodecyl Sulfate; D012996:Solutions; D013050:Spectrometry, Fluorescence; D014364:Tryptophan / Q000737:chemistry*
D002593:Cetrimonium Compounds; D008823:Micelles; D012996:Solutions; D012967:Sodium Dodecyl Sulfate; D014364:Tryptophan; D012256:Riboflavin; D000077286:Cetrimonium