食品科学

• 基础研究 • 上一篇    下一篇

大豆水分解吸-吸附等温线拟合模型

李 瑞1,史亚歌2,令 博1,侯莉侠1,王绍金1,3,*   

  1. 1.西北农林科技大学机械与电子工程学院,陕西 杨凌 712100;2.西北农林科技大学食品科学与工程学院,
    陕西 杨凌 712100;3.华盛顿州立大学生物系统工程系,普尔曼 99164-6120,美国
  • 出版日期:2015-06-15 发布日期:2015-06-07

Water Desorption and Adsorption Isotherms of Soybeans

LI Rui1, SHI Yage2, LING Bo1, HOU Lixia1, WANG Shaojin1,3,*   

  1. 1. College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling 712100, China;
    2. College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China;
    3. Department of Biological Systems Engineering, Washington State University, Pullman 99164-6120, USA
  • Online:2015-06-15 Published:2015-06-07

摘要:

为给在干燥、贮藏及运输过程中保证大豆的品质提供理论依据,实验测定了大豆在室温(25 ℃)条件下的水分解吸-吸附等温线。采用非线性回归分析,应用常见的5 种模型Oswin、Halsey、Hendenson、GAB、Chung-Pfost对大豆在室温条件下测得的水分进行解吸-吸附等温线拟合分析,以确定最佳拟合模型及其参数。结果表明:大豆的解吸等温线属于第Ⅱ种类型;吸附等温线属于第Ⅲ种类型;在整个水分活度范围内,大豆的解吸-吸附等温线均存在着滞后现象;最佳的解吸-吸附等温线拟合方程都是Oswin模型,它们的决定系数均高于0.993;Oswin模型拟合大豆解吸等温线的参数A和B分别为0.075和0.500,吸附等温线的参数A和B分别为0.075和0.498。

关键词: 大豆, 解吸, 吸附, 等温线, 拟合模型

Abstract:

The desorption and adsorption isotherms of soybeans were determined at room temperature (25 ℃). Five
commonly used models including Oswin, GAB, Halsey, Hendenson, and Chung-Pfost were applied to fit the experimental
data and to determine the best model as well as its parameters with non-linear regression analysis. The results indicated
that the desorption isotherm of soybeans belonged to type II, but the adsorption isotherm of soybean belonged to type III.
Within the whole scope of water activity, there was a hysteresis loop for soybean desorption-adsorption isotherms. The Oswin model
demonstrated the best fitting model for soybean desorption-adsorption isotherms with coefficient of determination r2 > 0.993. The
parameters A and B of Oswin model for desorption were 0.075 and 0.500, and thosef or adsorption were 0.075 and 0.498, respectively.

Key words: soybean, desorption, adsorption, isotherm, fitting model

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