Abstract
The desorption isotherms of japonica and indica rice seeds were determined at 15, 25, 35, 45 °C within the water activity range from 0.12 to 0.92 and it was observed that GAB model could accurately describe the desorption behaviors with low values of mean relative error (MRE). The thermodynamic properties of rice seeds were obtained by water desorption isotherms. The moisture content with the minimum integral entropy was considered as the best storage condition where the strongest energetic interaction between water molecular and solid occurred and the optimum seed moisture for storage at 35 °C occurred at 6.02 g water per 100 g of dry matter (ɑw of 0.12) for japonica rice seed and 5.28 g water per 100 g of dry matter (ɑw of 0.08) for indica rice seed, respectively. The mechanisms of desorption process were determined with integral enthalpy–entropy compensation theory and it was observed that the at low moisture content the desorption process of rice seed was controlled by changes of entropy, whereas the desorption process was considered to be controlled by enthalpy mechanism at high moisture content. It was found that the indica rice seed exhibited a wider water activity range in the minimum integral entropy zone, indicating that indica rice seed was more stable to withstand the different storage conditions compared with japonica rice seed.
Funding statement: This research was supported by The Commonweal Guild Grain Scientific Research Program of China (201513004) and National Key Research and Development Program of China (2016YFD0701801).
Appendix
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