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Original Articles

Effect of water content and molecular weight on the moisture isotherms and glass transition properties of inulin

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Pages 173-192 | Received 01 Sep 1999, Accepted 09 Feb 2000, Published online: 02 Sep 2009
 

Abstract

Inulin is being used more and more in foods due to its ability to add functionality either as a sweetener or fat replacer and also for its nutritional benefits. In this research, moisture sorption isotherms and glass transition temperature (Tg) as a function of moisture content and molecular weight for four inulins were determined. The Tg of the inulins was related to moisture content and also molecular weight. As with maltodextrins, the extent of lowering Tg was directly related to the average chain length (lower Tg with lower chain length). The sorption properties are also similar to maltodextrins, thus inulin may be useful in providing similar functionality as maltodextrins with almost no calories (1.5 kcal/g).

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