Study on moisture sorption characteristics of longan powder

  • ZHOU Yingtian ,
  • HUANG Shixin ,
  • ZHENG Siwen ,
  • ZHU Yanzong ,
  • WANG Kai ,
  • LIU Xuwei ,
  • ZHAO Lei ,
  • HU Zhuoyan
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  • 1(College of Food Science, South China Agricultural University, Guangzhou 510642, China)
    2(Gaozhou Shenma Eco-agricultural Development Co.Ltd., Gaozhou 525200, China)

Received date: 2023-03-03

  Revised date: 2023-03-22

  Online published: 2024-05-09

Abstract

This study focused on longan powder and used static measurement methods to determine its moisture sorption isotherms at different temperatures.The X-ray diffraction spectrum and glass transition temperature of longan powder at different moisture content were explored, and its thermodynamic properties were calculated through mathematical equations to reveal its moisture absorption characteristics.Results showed that the sorption isotherm of longan powder was type Ⅲ isotherm, and the Peleg model was the best-fitting model for the moisture sorption isotherm of longan powder.When water activity (Aw)>0.69, the moisture absorption of longan powder increased significantly, which may be related to the disappearance of the sugar crystal structure.The sorption process of longan powder complied with the theory of entropy and enthalpy compensation theory, and its Gibbs free energy was 1 586.6 J/mol>0, indicating that the sorption process of longan powder could be controlled by manipulating the environmental conditions.The initial glass transition temperature decreased from 14.6 ℃ to -26.5 ℃ and the end temperature decreased from 39.1 ℃ to -5.8 ℃ when the moisture content increased from 0.054 g/g to 0.350 g/g.The theoretical optimal storage Aw of longan powder at 25 ℃ was 0.086, corresponding to a dry basis moisture content of 0.049 5 g/g.The results of this study could provide a reference for the selection of storage conditions for longan powder.

Cite this article

ZHOU Yingtian , HUANG Shixin , ZHENG Siwen , ZHU Yanzong , WANG Kai , LIU Xuwei , ZHAO Lei , HU Zhuoyan . Study on moisture sorption characteristics of longan powder[J]. Food and Fermentation Industries, 2024 , 50(7) : 236 -241 . DOI: 10.13995/j.cnki.11-1802/ts.035348

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