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 65445
Title Structure and Scaling Behavior of Aging Rennet-Induced Casein Gels Examined by Confocal Microscopy and Permeametry
Author(s) Mellema, M.; Heesakkers, J.W.M.; Opheusden, J.H.J. van; Vliet, T. van
Source Langmuir 16 (2000)17. - ISSN 0743-7463 - p. 6847 - 6854.
Department(s) Physics and Physical Chemistry of Foods
Mathematical and Statistical Methods - Biometris
Publication type Refereed Article in a scientific journal
Publication year 2000
Abstract A study is presented on the structure of rennet(-induced) casein or skim milk gels at three pH values (5.3, 6.0, and 6.65) and temperatures (20, 25, and 30 C). The structure was examined by confocal scanning laser microscopy and permeametry. Deconvolution was applied to the microscopic images. A fractal scaling analysis has been applied to the images and permeametry results. In this analysis, the fractal dimensionality (Df), lower cutoff length (R0), and apparent pore size (P) of the linear scaling regime were calculated from the microscopical data. The Df and apparent pore size were also calculated from the permeametry data. During aging of the gels, a coarsening of the structure was observed; the pore size increased and the clusters became more compact. This was reflected in the fractal parameters: R0 and P increased during gel aging. Their values are generally high (0.5-1.5 and 5.0-15 m, respectively) compared to data obtained by computer simulations. The Df value is also high (~2.2-2.6), which is an indication of slow aggregation or rearrangements during aggregation. The gel aging effects are probably mainly due to rearrangements such as particle fusion and strand fracture, which rates increase with increasing temperature, and even more pronouncedly, with decreasing pH.
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