Calcium‐induced modifications of 2% sodium caseinate at 4°C and β‐casein extraction by microfiltration on membranes were studied. Pore diameters and tangential flow rates were investigated. Calcium addition up to 3 g.L −1 was followed by a pH decrease, particle size increase and a shift of casein towards colloidal state. The higher purity of β‐casein in the soluble fraction was obtained between 1 and 1.5 g.L −1 of added calcium. Increasing calcium to 1 g.L −1 induced hydraulic resistance increase, and higher retention of β‐casein. Particle size increases were related to physicochemical modifications induced by the calcium addition.
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Famelart et al. (1994) studied this question.
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