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<p>‘Hom Nil’ is a popular Thai purple rice cultivar rich in anthocyanins. Germination and parboiling further enhance its health-promoting properties. This study investigated the thin-layer drying kinetics and moisture sorption behavior of germinated parboiled rice (GPR). Equilibrium moisture content was measured at 20, 40, and 60&#xa0;°C across relative humidity (RH) levels of 10 to 85% using a dynamic vapor sorption system for both paddy and husked GPR. At a fixed RH, moisture content decreased with increasing temperature. Sorption isotherms exhibited hysteresis, with desorption values higher than adsorption values. Five modified sorption models (GAB, Oswin, Halsey, Henderson, and Chung−Pfost) were evaluated. The modified Halsey model provided the best fit to the data. Drying experiments were conducted at 40, 50, 60, 70, and 80&#xa0;°C under air velocities of 0.2–1.3&#xa0;m s<sup>−</sup><sup>1</sup> using both over-flow and through-flow modes. The Page model provided the best fit under all conditions. Drying temperature significantly affected drying rate and time. Drying mode also significantly influenced the drying rate, with the through-flow mode leading to faster moisture removal than the over-flow mode, due to higher heat and mass transfer. These findings provide essential parameters for optimizing GPR drying and storage.</p>

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Moisture sorption isotherms and drying behavior of germinated parboiled purple rice ‘Hom Nil’

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Supaporn Klaykruayat,
  • Marcus Nagle,
  • Busarakorn Mahayothee,
  • Pramote Khuwijitjaru,
  • Dimitrios Argyropoulos,
  • Joachim Müller

摘要

‘Hom Nil’ is a popular Thai purple rice cultivar rich in anthocyanins. Germination and parboiling further enhance its health-promoting properties. This study investigated the thin-layer drying kinetics and moisture sorption behavior of germinated parboiled rice (GPR). Equilibrium moisture content was measured at 20, 40, and 60 °C across relative humidity (RH) levels of 10 to 85% using a dynamic vapor sorption system for both paddy and husked GPR. At a fixed RH, moisture content decreased with increasing temperature. Sorption isotherms exhibited hysteresis, with desorption values higher than adsorption values. Five modified sorption models (GAB, Oswin, Halsey, Henderson, and Chung−Pfost) were evaluated. The modified Halsey model provided the best fit to the data. Drying experiments were conducted at 40, 50, 60, 70, and 80 °C under air velocities of 0.2–1.3 m s−1 using both over-flow and through-flow modes. The Page model provided the best fit under all conditions. Drying temperature significantly affected drying rate and time. Drying mode also significantly influenced the drying rate, with the through-flow mode leading to faster moisture removal than the over-flow mode, due to higher heat and mass transfer. These findings provide essential parameters for optimizing GPR drying and storage.