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Antifoaming action and mechanism of polyoxyethylene-polyoxypropylene-polyoxyethylene-type triblock copolymers (Pluronics) on aqueous bovine serum albumin (BSA) foams were studied. Addition of Pluronic L-62 or L-61 to 4 g l -1 BSA solution in 4-100 μM concentrations had a strong antifoaming effect which increased with the Pluronic concentration. It was found that, in spite of the general...