Abstract
Calcium taurodeoxycholate (CaTDC) has been studied in order to throw light on the structure of its micellar aggregates and on the effect of the competition between calcium and sodium ions for the formation of aggregates in aqueous solution. A fiber has been drawn from a gel formed in an aqueous micellar solution of CaTDC. Its X-ray pattern shows a close resemblance with those of the fibers drawn from aqueous micellar solutions of the sodium and rubidium salts of glycodeoxycholic and taurodeoxycholic acids (NaGDC, RbGDC, NaTDC, and RbTDC). Therefore, it has been likewise interpreted by means of a structure composed of trimers arranged in 7/1 helices. The helical structures of the anions are similar for CaTDC, NaGDC, RbGDC, NaTDC, and RbTDC. Quasi-elastic light-scattering measurements, carried out on CaTDC aqueous solutions as a function of ionic strength, point out a micellar growth greater or smaller than that of NaTDC or calcium glycodeoxycholate, respectively. The NaTDC micellar size increases much more...
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