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Interactions of a prototypical bile acid (cholic acid, ‘ Ch ’) and its corresponding sodium salt (sodium cholate, ‘ NaCh ’) with a standard dietary  β -glucan ( β -G), bearing  β -D-glucopyranose units having mixed 1-4/1-3 glycosidic linkages are studied using molecular dynamics simulation and density functional theory (DFT) calculations. Self-aggregation of the biliary components and their interaction with fifteen strands of the decameric mixed linkage  β -glucan is elucidated by estimating varieties of physical properties like the coordination number, moment of inertia and shape anisotropy of the biggest cluster formed at different time instants. Small angle scattering profiles indicate formation of compact spheroidal aggregates. The simulated results of small angle scattering and  1 H NMR chemical shifts are compared to spectroscopic data, wherever available. Density functional theory calculations and estimation of the  1 H NMR chemical shifts of Ch-protons lying close to the  β -G chains reveal change in chemical shift values from that in absence of the polysaccharide. Hydrogen bonding and non-bonding interactions, primarily short range van der Waals interactions and some extent of inter-molecular charge transfer are found to play significant role in stabilizing the complex soft assemblies of bile acid aggregates and  β -G. Communicated by Ramaswamy H. Sarma

Structural and spectroscopic details of polysaccharide–bile acid composites from molecular dynamics simulations