Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 333182
Title Serum separation and structure of depletion- and bridging-flocculated emulsions: a comparison
Author(s) Blijdenstein, T.B.J.; Winden, A.J.M. van; Vliet, T. van; Aken, G.A. van
Source Colloids and Surfaces. A: Physicochemical and Engineering Aspects 245 (2004)1-3. - ISSN 0927-7757 - p. 41 - 48.
Department(s) Physics and Physical Chemistry of Foods
AFSG Food Quality
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) in-water emulsions - protein-stabilized emulsion - beta-lactoglobulin - polysaccharide - suspensions - carrageenan - interfaces - polymers - behavior - rheology
Abstract Stability against demixing, rheology and microstructure of emulsions that were flocculated by depletion or bridging were compared. Flocculation by depletion and bridging was induced by addition of the polysaccharide carboxy-methylcellulose (CMC) to emulsions that were stabilised by ß-lactoglobulin (ß-lg) at pH 6.7 and 3.0, respectively. Depletion-flocculated emulsions generally have a lower initial demixing rates than bridging-flocculated emulsions, but after long times they are compressed to a higher oil content by gravity. Differences in the initial demixing rate are shown to be caused by differences in porosity between the gels. In bridging-flocculated emulsions, large irreversible flocs are formed by flow during mixing, resulting in larger permeability than in depletion-flocculated emulsions. Rheological measurements showed that bridging-flocculated emulsions could withstand larger stresses than depletion-flocculated emulsions. Greater network strength and a lower probability of rearrangements explain why bridging-flocculation systems can retain more water at longer times. Keywords: Emulsions; Depletion; Bridging; Structure; Serum separation
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