Abstract
It is shown by the methods of precision tensiometry, quasi-elastic light scattering, and UV, IR, and fluorescent spectroscopies that the properties of binary aqueous solutions with a constant concentration of bovine serum albumin and different concentrations of the nonionic surfactant Tween 80 (1 × 10–7−6 × 10−2 M) are determined mainly by the complexation and formation of a new phase. The complexation occurs owing to specific interactions (hydrogen bonding) between polar groups of Tween 80 and protein molecules. The solubility in water and surface activity of a 1: 1 Tween 80-protein complex are determined. At the concentrations above the break point on surface tension isotherms (conditionally corresponding to critical association concentration), the particles are formed with radii varying from 16 to 350 nm. At a molar nonionic surfactant/protein ratio in the range of 6–10, the additional binding of Tween 80 molecules by the particles of the new phase due to hydrophobic interactions is observed.
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Original Russian Text © N.M. Zadymova, G.P. Yampol’skaya, L.Yu. Filatova, 2006, published in Kolloidnyi Zhurnal, 2006, Vol. 68, No. 2, pp. 187–197.
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Zadymova, N.M., Yampol’skaya, G.P. & Filatova, L.Y. Interaction of bovine serum albumin with nonionic surfactant Tween 80 in aqueous solutions: Complexation and association. Colloid J 68, 162–172 (2006). https://doi.org/10.1134/S1061933X06020074
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DOI: https://doi.org/10.1134/S1061933X06020074