Abstract

The effective distribution coefficient, K Ieff , of turkey egg white lysozyme into host hen egg white lysozyme crystals was measured for varying levels of relative supersaturation, impurity concentrations and temperatures. Turkey egg white lysozyme served as a test impurity of high homology to hen egg white lysozyme. K Ieff increased with increasing host protein concentration and temperature, consistent with a kinetically controlled incorporation process. The principles of slow crystal growth rate to limit impurity incorporation were applied to a commercial source of lysozyme with concomitant improvement in purity of re-crystallized protein.

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