ASSOCIATION OF BOVINE SH-KAPPA-CASEIN AT PH 7-0

The self-association of SH-/c-casein at pH 7-0 in 0-01 M-EDTA, 0-001 M-dithiothreitol buffer, containing 0-1, 0-2, 0-5 or 1-0 M-NaCl is of a monomer-polymer type. The polymer is a spherical particle, diam. 23 nm and mol. wt 570000 (30 monomers). These parameters are not greatly influenced by variations in ionic strength above 0-1. The critical micelle concentration, which is a property of a monomer-polymer equilibrium, decreases with increasing ionic strength. The standard free energy of association is about 36 kJ/mol. monomer at 20 oC. © 1979, Proprietors of Journal of Dairy Research. All rights reserved.