期刊
JOURNAL OF CEREAL SCIENCE
卷 70, 期 -, 页码 164-169出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jcs.2016.06.006
关键词
Rice milling; HRY; Glass transition; Un-freezable water
资金
- Thailand Research Fund (TRF) [MSD57I0141]
Head rice yield (HRY) in relation to glass transition temperatures and un-freezable water of waxy (Sanpah-tawng) and non-waxy (Phitsanulok 2) rough rice were studied. Freezing points and glass transitions were measured by differential scanning calorimetry (DSC) as a function of solid fraction. Both waxy and non-waxy rice samples exhibited similar trends in glass transition when solid fraction was decreased. The transition temperature and enthalpy of ice melting decreased as the solid fraction increased. The onset (i.e. initial) glass transition was increased from 27 to 35 degrees C when solid fraction increased from 0.80 to 0.97. Un-freezable water contents were found to be different for both rice samples. The rate of HRY (i.e. rate constant) increased differently (i.e. higher above glass transition) when rice samples were stored above (i.e. 35 and 45 degrees C) and below glass transition temperatures. It was found that storage of fissured rice (low HRY) at the temperatures especially above glass transition could relax the strains inside a rice kernel and subsequently improved HRY. (C) 2016 Elsevier Ltd. All rights reserved.
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