Effect of storage temperatures on the head rice yield in relation to glass transition temperatures and un-freezable water

Khongsak Srikaeo, Chutamas Boonrod, Mohammad Shafiur Rahman

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Head rice yield (HRY) in relation to glass transition temperatures and un-freezable water of waxy (San-pah-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 on-set (i.e. initial) glass transition was increased from 27 to 35 °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 °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.

Original languageEnglish
Pages (from-to)164-169
Number of pages6
JournalJournal of Cereal Science
Volume70
DOIs
Publication statusPublished - Jul 1 2016

Fingerprint

glass transition temperature
Transition Temperature
storage temperature
Glass
Glass transition
Head
glass transition
rice
Temperature
Water
water
Ice
Freezing
Water content
Differential scanning calorimetry
Enthalpy
Rate constants
Melting
rough rice
Oryza

Keywords

  • Glass transition
  • HRY
  • Rice milling
  • Un-freezable water

ASJC Scopus subject areas

  • Food Science
  • Biochemistry

Cite this

Effect of storage temperatures on the head rice yield in relation to glass transition temperatures and un-freezable water. / Srikaeo, Khongsak; Boonrod, Chutamas; Rahman, Mohammad Shafiur.

In: Journal of Cereal Science, Vol. 70, 01.07.2016, p. 164-169.

Research output: Contribution to journalArticle

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