Hydrogen-transfer reactions from phenols to TEMPO prefluorescent probes in micellar systems.
A nitroxide prefluorescent probe has been used to evaluate local reactivity of antioxidants in micellar systems. An apparent rate constant that directly reflects the relevance of antioxidant hydrophobicity on the reaction toward nitroxide radicals has been defined. Dramatic increases in this parameter for quercetin are shown on moving from methanol to micellar media: 90 and 230 fold enhancements for SDS and Triton X100 micelles, respectively. This is a clear consequence of the favorable partition of reactants in the micelles.
Aliaga
Carolina
C
Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago de Chile.
Juárez-Ruiz
Juan M
JM
Scaiano
J C
JC
Aspée
Alexis
A
D000975:Antioxidants / Q000737:chemistry; D003497:Cyclic N-Oxides / Q000737:chemistry*; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D008823:Micelles; D009589:Nitrogen Oxides / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*
D000975:Antioxidants; D003497:Cyclic N-Oxides; D005456:Fluorescent Dyes; D008823:Micelles; D009589:Nitrogen Oxides; D010636:Phenols; D006859:Hydrogen; C003959:TEMPO