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MICELLAR EFFECT ON THE FLUORESCENCE QUENCHING OF INDOLIC COMPOUNDS BY AMINOACIDS
Author(s) -
Bertolotti S. G.,
Bohorquez M. DEL V.,
Cosa J. J.,
Garciaand N. A.,
Previtali C. M.
Publication year - 1987
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1987.tb04777.x
Subject(s) - chemistry , quenching (fluorescence) , micelle , sodium dodecyl sulfate , cationic polymerization , fluorescence , sulfur , valine , cysteine , photochemistry , inorganic chemistry , amino acid , organic chemistry , biochemistry , aqueous solution , physics , quantum mechanics , enzyme
The effect of anionic and cationic micelles on the fluorescence quenching of indolic compounds by aliphatic aminoacids has been studied. Sodium dodecyl sulfate (SDS) micelles increase the quenching efficiency of glycine, alanine, valine and leucines up to a factor of two. On the other hand, cetyltrimethyl ammonium (CTAB and CTAC) micelles reduce the quenching. For sulfur containing aminoacids (methionine and cysteine) both SDS and CTAC reduce the quenching. The inhibitory effect is larger for CTAC. Linear Stern‐Volmer plots were obtained and in the case of SDS lifetime measurements indicate that the quenching is of dynamic nature. The results were interpreted by a model which assumes that aminoacids can interact with SDS micelles. Partition constants of the order of unity were estimated. For CTAC the aminoacids are not able to interact with the micelles.