Denaturation of human serum albumin under the action of cetyltrimethylammonium bromide according to fluorescence polarization data of protein

Denaturation of human serum albumin (HSA) under the action of cationic detergent cetyltrimethylammonium bromide (CTAB) is studied at different pH values by estimating the rotational diffusion of protein via fluorescence polarization. The degree of polarization of HSA tryptophan fluorescence, the rotational relaxation time, the rotational diffusion coefficient and the effective Einstein radius of the HSA molecules in solutions with different CTAB concentrations at different pH values are determined. The obtained rotational diffusion parameters of the HSA molecules show that under the action of CTAB, HSA denaturation has a one-stage character and proceeds more intensely and effectively at pH values higher than the pI value of protein (4.7).