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Tryptophan Photo-Oxidation by Clay-Adsorbed Sensitizers

Published online by Cambridge University Press:  09 July 2018

J. Cenens  and
R. A. Schoonheydt
J. Cenens
Affiliation:
Laboratorium voor Oppervlaktescheikunde, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 92, 3030 Leuven (Heverlee), Belgium
R. A. Schoonheydt
Affiliation:
Laboratorium voor Oppervlaktescheikunde, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 92, 3030 Leuven (Heverlee), Belgium
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Abstract

The photo-oxidation of tryptophan (TRP), photosensitized by methylene blue (MB) exchanged on hectorite, Wyoming bentonite and laponite is strongly influenced by three factors: (i) Fe(III) in the structure, which quenches the excited state of MB; (ii) the adsorption site of MB, as photo-oxidation only takes place with MB on the external surface; (iii) dye aggregation, which reduces the yield. Rose bengal (RB), chemically anchored on the external surface of Barasym does not sensitize the photo-oxidation of TRP.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 2 , June 1988 , pp. 205 - 212
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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