Dynamic surface properties of milk proteins

Authors: G A van Aken M T E Merks

Publish Date: 1994

Volume: , Issue: , Pages: 281-284

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Abstract

Surfacedilational properties of adsorbed layers of the pure milk proteins βcasein βlactoglobulinA and bovine serum albumin were studied by monitoring the surface pressure after a stepwise alteration of the area of the surface The surface pressure instantaneously responds to the applied area variation by an amount that is dependent on the particular protein and the initial surface pressure For βlactoglobulin and bovine serum albumin at surface pressures above 10 mN·m−1 it was found that the instantaneous change of the surface pressure is followed by a decay towards a smaller change The decay curves are wellfitted by biexponential functions An important feature is that all the processes appeared reversible at time scales longer than the relaxation times The surfacedilational behavior of the proteins was quantified by the values of the surfacedilational modulus at short and long timescales and the measured decay times

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