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 342406
Title Modeling macromolecular degradation of corn starch in a twin screw extruder
Author(s) Einde, R.M. van den; Veen, M.E. van der; Bosman, H.; Goot, A.J. van der; Boom, R.M.
Source Journal of Food Engineering 66 (2005)2. - ISSN 0260-8774 - p. 147 - 154.
Department(s) Food Process Engineering
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) waxy-maize starch - wheat-starch - thermomechanical treatment - extensional viscosity - extrusion-cooking - shear - breakdown - rheometer - flour
Abstract Macromolecular degradation of starch in a twin screw extruder was modeled. A shear cell having well-defined flow conditions described earlier was used to measure peak viscosity of corn starch melts at various moisture contents and temperatures. Shear rate and elongation rate distributions in the extruder were estimated from numerical calculations from literature and elongational viscosity was estimated using the Trouton ratio. In this way, stresses in the extruder were calculated and, using relations on maximum stress vs. intrinsic viscosity obtained in earlier work, the expected relative intrinsic viscosity was calculated. The model gave a good prediction of relative intrinsic viscosity after extrusion at various temperatures (97-130 °C), moisture contents (23-45%) and screw speeds (90 or 140 rpm). This suggests that the use of pilot scale equipment having a well-defined flow pattern can be useful for understanding complex processes such as extrusion.
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