Phase behavior of casein micelles/exocellular polysaccharide mixtures : experiment and theory

R. Tuinier, C.G. de Kruif

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44 Citations (Scopus)
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Abstract

Dispersions of casein micelles and an exocellular polysaccharide (EPS), obtained from Lactococcus lactis subsp. cremoris NIZO B40 EPS, show a phase separation. The phase separation is of the colloidal gas–liquid type. We have determined a phase diagram that describes the separation of skim milk with EPS into a casein-micelle rich phase and an EPS rich phase. We compare the phase diagram with those calculated from theories developed by Vrij, and by Lekkerkerker and co-workers, showing that the experimental phase boundary can be predicted quite well. From dynamic light scatteringmeasurements of the self-diffusion of the casein micelles in the presence of EPS the spinodal could be located and it corresponds with the experimental phase boundary.
Original languageEnglish
Pages (from-to)9296-9304
JournalJournal of Chemical Physics
Volume110
DOIs
Publication statusPublished - 1999
Externally publishedYes

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