title: Mixed association of cholesterol with methyl cholate and methyl lithocholate in chloroform solutions.
abstract: The concentration-dependent mixed association behavior of cholesterol with methyl cholate (MeC) and methyl lithocholate (MeLC) in chloroform at 37 degrees C has been studied by vapor pressure osmometry (VPO). This study is part of a larger project to investigate the effect of number and position of hydroxyl-bearing steroids. Using theories developed by Adams and by Steiner, the model and appropriate parameters for the nonideal mixed associations were elucidated. For the MeLC/cholesterol system, no mixed association was observed. For the MeC/cholesterol system, both methods of analysis indicate that a nonideal AB complex formation occurs. The best parameters to explain the experimental data are kAB = 0.04 1/g; BAB (the nonideal term) = 1.5 X 10(-5) 1 mol g-2.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002725:Chloroform; D020355:Cholates; D002784:Cholesterol; D002793:Cholic Acids; D008095:Lithocholic Acid / Q000031:analogs & derivatives*; D008433:Mathematics
chemical_list: D020355:Cholates; D002793:Cholic Acids; C037035:methyl lithocholate; D008095:Lithocholic Acid; D002725:Chloroform; D002784:Cholesterol; C037034:methyl cholate