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.

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Record number 497009
Title Relation between gel stiffness and water holding for coarse and fine-stranded protein gels
Author(s) Urbonaite, V.; Kaaij, S. van der; Jongh, H.H.J. de; Scholten, E.; Ako, K.; Linden, E. van der; Pouvreau, L.
Source Food Hydrocolloids 56 (2016). - ISSN 0268-005X - p. 334 - 343.
Department(s) Physics and Physical Chemistry of Foods
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Effective gel permeability coefficient - Effective water flux coefficient - Gel coarseness - Water holding - WPI gels - Young's modulus

The sensory perception of foods is directly related to gel morphology. The aim of this research was to investigate the relationship between gel water holding and stiffness for gels with a different morphology. Whey protein gels were prepared by varying ionic strength to create fine and coarse-stranded gels. These gels were characterized for their coarseness, stiffness and their water holding capacity. Fine gels were referred to typical coarseness length scale smaller than 0.1 μm and coarse gels were referred to coarseness length scale larger than 0.1 μm. Water holding was measured both as a function of time and of applied pressure. Increased gel coarseness length scale in both fine and coarse gels resulted in a larger extent of network deformation at a certain applied force. For fine gels, the coarseness length scale of the gel was shown to determine water removal. In the case of coarse gels, coarseness length scale and stiffness had a counteracting effect, but coarseness length scale was still dominant. These results show that the tuning of coarseness length scale of protein networks independent of stiffness or, the other way round, provides a tool to set the water holding capacity in food gels.

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