Static and dynamic light scattering on solutions of precrystalline β-galactosidase

A concentration dependent association of β-galactosidase in aqueous buffer solution is demonstrated by static and dynamic light scattering. A procedure is suggested which allows the calculation of the true molar mass of the aggregates from the apparent data measured in a good solvent. The associating system exhibits typical critical behavior with a critical exponent of γ=1.77±0.11 which is characteristic of percolation. The system behaves like a...