Abstract
Ovalbumin and lysozyme have been reported to undergo a mixed association in solutions of low ionic strength. Osmotic pressure experiments were performed on ovalbumin and on lysozyme solutions in 0.06 M cacodylate buffer (I = 0.02, pH = 5.8) at 30 and at 37 degrees C. The individual proteins did not undergo any self-associations at either temperature; these measurements indicated that each of the solutions was nonideal. Osmotic pressure experiments on three blends of lysozyme and ovalbumin at 30 and 37 degrees C could be interpreted in two ways. One interpretation was that a nonideal, nonassociating mixture of A and B was present; for the three solutions the mixed nonideal term BAB was negative. A negative nonideal term is usually interpreted as indicating an association. The other interpretation of the data was as a quasi-ideal mixed association of the type A + B in equilibrium AB.
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