Food Science and Biotechnology

Korean Society of Food Science and Technology (한국식품과학회)
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Dynamic Rheological Properties of Honeys at Low Temperatures as Affected by Moisture Content and Temperature

  • Kang, Kyoung-Mo (Department of Food Science and Technology, Dongguk University) ;
  • Yoo, Byoung-Seung (Department of Food Science and Technology, Dongguk University)
  • Published : 2008.02.29
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Abstract

Dynamic rheological properties of honey samples with 3 different moisture contents (17.2, 19.0, and 21.0%) were evaluated at various low temperatures (-15, -10, -5, and $0^{\circ}C$) using a controlled stress rheometer. The honey samples displayed a liquid-like behavior, with loss modulus (G") predominating over storage modulus (G') (G">>G'), showing the high dependence on frequency ($\omega$). The magnitudes of G' and G" decreased with an increase in temperature and water content while a predominant increase of G' was noticed at $-15^{\circ}C$. The time-temperature superposition (TTS) principle was applied to bring G" values for honeys at various temperatures together into a master curve. The G" over the temperature range of -15 to $0^{\circ}C$ obeyed the Arrhenius relationship with a high determination coefficient ($R^2=0.98-0.99$). Activation energy value (Ea=112.4 kJ/mol) of honey with a moisture content of 17.2% was higher than those (Ea=98.8-101.1 kJ/mol) of other honey samples with higher moisture contents.

Keywords

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