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Micellar catalyzed redox reactions of bilirubin in CTAB medium. A pulse radiolysis study
Author(s) -
Adhikari Soumya K.,
Guha Shambhu N.,
Gopinathan C.
Publication year - 1994
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550260904
Subject(s) - chemistry , micelle , radiolysis , reaction rate constant , catalysis , solvent , redox , aqueous solution , photochemistry , micellar solutions , polarity (international relations) , reaction rate , radical , cationic polymerization , diffusion , solvent effects , alcohol , kinetics , inorganic chemistry , organic chemistry , thermodynamics , biochemistry , physics , quantum mechanics , cell
The reaction of CO 2 ˙−with bilirubin which is not detectable in homogeneous aqueous medium proceeds almost with diffusion controlled rate in CTAB micellar system. This could be explained on the basis of catalysis caused by the possible electrostatic surface potential of cationic CTAB Micelles. The rate constant for the oxidation of bilirubin by haloperoxyl radicals have been shown to increase with increasing solvent polarity. Although the polarity effect was small, it followed a trend in the expected direction. Micellar effect was not observed in the oxidation reactions when alcohol was present in high concentration. But a small increase in the rate constant was observed when alcohol concentration was lower. © 1994 John Wiley & Sons, Inc.