Abstract

The taurocholate (TC) to lecithin (L) molar ratio (K) and molecular weight of mixed TC-L micelles coexisting with simple TC micelles were determined by employing laser light-scattering measurement and an interaction model of mixed and simple micelles. When the nonmixed micellar taurocholate (NMTC) concentration was greater than 25 mM, the K value and molecular weight of mixed TC-L micelles were ∼ 4.3 and ∼ 20,000 daltons, respectively, at an L concentration of 6 mM, and ∼ 2.0 and ∼ 35,000 daltons at L concentrations of 12 mM and 21 mM. A quantitative model of the formation of simple TC micelles and mixed TC-L micelles indicated that, when the NMTC concentration was greater than 25 mM, mixed TC-L micelles were unstable at low L levels because of low concentrations of L monomers.

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