Abstract

Globular protein solutions of lysozyme in water and added salt are modelledaccording to the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory,in order to determine their fluid–fluid and fluid–solid coexistence lines.Calculations are based on both computer simulations and theoreticalapproaches. Our results indicate that, when the potential parametersare obtained by fitting physical properties directly deducible from eitherstatic or dynamic light scattering data, the fluid–fluid phase coexistencepredictions agree quite well with the experiments. Our description of the solidphase allows only a qualitative reproduction of the experimental solubilityboundaries. The overall accuracy of our predictions is discussed in view of thewell known limitations of the DLVO representation of protein solutions.

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