Effect of rice variety and harvest moisture content on the glass transition temperature of uruguayan rice varieties

Authors

DOI:

https://doi.org/10.26461/20.01

Keywords:

glass transition, rice, rice drying, differential scanning calorimetry, DSC

Abstract

The glass transition temperature (Tg) of a material is the range of temperatures where the transition between a glassy and a rubbery state occurs, producing changes that are reflected in its physicochemical properties. The objective of this research is to determine the glass transition curves (Tg vs. grain moisture content) of three Uruguayan rice varieties and assess whether there are significant differences among them. The influence of the harvest moisture content (HMC) is also evaluated. To do this, each rice sample is dried for different periods of time to obtain grain moisture contents (GMC) in a range between 10% and 22% (on a wet basis). The Tg is then measured by differential scanning calorimetry (DSC). The results are compared by applying ANOVA and the Tukey test. It was observed that the Tg increases as GMC decreases for the three varieties studied. The glass transition curves show that there are significant differences among the three varieties in the range of GMC going from 12% to 16%. The HMC did not affect the Tg in the range studied. The results obtained can be applied to optimize the rice drying process, minimizing the formation of fissures.

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References

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Published

2020-05-21

How to Cite

Garcia Llobodanin, L., Ponce de León, N., Moreira, S., & Billiris, A. (2020). Effect of rice variety and harvest moisture content on the glass transition temperature of uruguayan rice varieties. INNOTEC, (20 jul-dic), 106–116. https://doi.org/10.26461/20.01

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Articles