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Chromatographic study on stepwise aggregation patterns of zwitterionic derivatives of cholic acid

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Chromatographic study on stepwise aggregation patterns of zwitterionic derivatives of cholic acid

Content Provider	Royal Society of Chemistry (RSC)
Author	Neya, Saburo Funasaki, Noriaki Ueshiba, Ryota Hada, Sakae
Copyright Year	1993
Abstract	The frontal chromatogram of the 2-hydroxy derivative (CHAPSO) of 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS) has been obtained on a Sephadex G-10 column at 298 K. From the centroid volume, Vc, of the chromatogram, the monomer concentration, the weight- and number-average aggregation numbers (nw and nn), the critical micelle concentration (c.m.c.) and the dimerization constant, k2, are evaluated, and furthermore, stepwise aggregation constants, ki, are estimated on the basis of several self-association models. At small aggregation numbers, an odd–even alternation of the aggregation number dependence of ki is found and CHAPSO self-associates cooperatively, whereas it does so anti-cooperatively at high aggregation numbers. The c.m.c. depends on the treatment of the Vc data, and this result suggests that CHAPSO forms small micelles. The derivative chromatogram of CHAPSO and some characteristic values obtained therefrom are markedly different from those of a dye and typical surfactants, and reflect their aggregation patterns. The derivative chromatogram simulated on the basis of the above aggregation models is very similar to the observed one. The differences in limiting aggregation constant k and nw/nn between CHAPSO and CHAPS are explained on the basis of the fact that the head group of CHAPSO is more bulky than that of CHAPS. The micelle size distribution of CHAPSO is calculated on the basis of the above aggregation models. The concentrations of the monomer and each aggregate species will be useful for applications of CHAPSO and CHAPS to the solubilization of membrane proteins as well as for the investigation of the aggregation patterns of bile salts.
Starting Page	4355
Ending Page	4362
Page Count	8
File Format	PDF
ISSN	09565000
Volume Number	89
Issue Number	24
Journal	Journal of the Chemical Society, Faraday Transactions
DOI	10.1039/FT9938904355
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Micelle Chromatography Centroid Dye Critical micelle concentration Bile acid Aggregation number CHAPSO CHAPS detergent Sephadex Monomer Correlation and dependence Potassium
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry

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