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 336671
Title An improved experimental and regression methodology for sorption isotherms
Author(s) Quirijns, E.J.; Boxtel, A.J.B. van; Loon, W.K.P. van; Straten, G. van
Source Journal of the Science of Food and Agriculture 85 (2005)2. - ISSN 0022-5142 - p. 175 - 185.
Department(s) Systems and Control Group
Publication type Refereed Article in a scientific journal
Publication year 2005
Keyword(s) equilibrium moisture-content - water activity - 3 temperatures - desorption - equations - products - fruit - foods - seeds - fufu
Abstract Sorption isotherms of corn and starch cylinders with immobilised catalase are experimentally determined at different temperatures for use in drying models in optimal control studies. This application of the sorption isotherm requires an accurate prediction of the sorption data at different temperatures for the low water activity range. The GAB equation is used for the prediction of the sorption isotherms. Two major problems are encountered by employing standard procedures, ie prediction of sorption at aw <0.11 and sensitivity of the GAB parameters to the applied data range. An improved methodology is developed, consisting of extending the standard experimental procedure with additional data points in the low water activity range and changing the criterion in the regression procedure in the sum of squares, which is weighed by the variance of the experimental data. The new methodology leads to accurate, consistent and physically relevant parameters of the GAB equation, which are independent of the applied data range in the regression analysis and which result in accurate predictions of the sorption behaviour at low water activity. The sorption data at different temperatures at low water activity can be predicted in the best way with parameters obtained after direct regression based on weighed SSQ.
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