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The Ionization Behavior of Fatty Acids and Bile Acids in Micelles and Membranes

✍ Scribed by Donald M. Small; Donna J. Cabral; David P. Cistola; John S. Parks; James A. Hamilton

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
320 KB
Volume
4
Category
Article
ISSN
0270-9139

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✦ Synopsis

The ionization behavior of carboxylic acids including aliphatic chain fatty acids and bile acids in solutions, micelles, membranes and proteins is of considerable biological interest. The 13C nuclear magnetic resonance chemical shift of carboxyl carbon of a variety of acids has been shown to be a linear function of the state of ionization of the carboxyl group. Thus, by measuring the chemical shift as a function of the amount of acid or base added to a solution, the state of ionization and the apparent pKa of the carboxyl group may be determined. The method is illustrated in this paper using butyric acid, and results (given as apparent pKa values) are tabulated for a variety of fatty acids and cholic acid in different environments such as monomeric solutions, micelles, membranes

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