Water Sorption of Food Models for Studies of Glass Transition and Reaction Kinetics
Applicability of a method for studying glass transition and reaction rates was evaluated. Water sorption of maltodextrin and poly(vinylpyrrolidone) based food models having lysine and xylose as reactants were determined gravimetrically at 4 temperatures. Data were modeled using the Guggenheim-Anders...
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Published in | Journal of food science Vol. 67; no. 5; pp. 1758 - 1766 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Oxford, UK
Blackwell Publishing Ltd
01.06.2002
Institute of Food Technologists Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Applicability of a method for studying glass transition and reaction rates was evaluated. Water sorption of maltodextrin and poly(vinylpyrrolidone) based food models having lysine and xylose as reactants were determined gravimetrically at 4 temperatures. Data were modeled using the Guggenheim-Anderson-DeBoer (GAB) equation, isosteric heats of sorption were calculated, and water activity shift with temperature was evaluated using the Clausius Clapyeron equation and the GAB equation that included the effect of temperature (the GAB(T) equation). Within a 100 °C temperature range, water activity shift with temperature could not solely explain different reaction rates. Storage of food models in sealed containers can be applied in studies of glass transition and reaction kinetics. |
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Bibliography: | http://dx.doi.org/10.1111/j.1365-2621.2002.tb08719.x ArticleID:JFDS1758 ark:/67375/WNG-WFJVPN7S-Z istex:55257692C7A266D57C975DB7310D88470A965440 This study was supported by the Commission of the European Communities, Agriculture and Fisheries (FAIR) specific RTD programme, CT96–1085, “Enhancement of Quality of Food and Related Systems by Control of Molecular Mobility”. The study does not necessarily reflect the Commission's views, and it in no way anticipates the Commission's future policy in this area. Financial support from the Academy of Finland (35764) and Tiura Foundation also is greatly appreciated. |
ISSN: | 0022-1147 1750-3841 |
DOI: | 10.1111/j.1365-2621.2002.tb08719.x |