食品科学 ›› 2012, Vol. 33 ›› Issue (19): 45-51.

• 基础研究 • 上一篇    下一篇

小麦粉水分的吸附与解吸特性

王明洁,吴小丽,袁 建,鞠兴荣,周 洲   

  1. 南京财经大学食品科学与工程学院 江苏省粮油品质控制及深加工技术重点实验室
  • 收稿日期:2011-08-25 修回日期:2012-08-29 出版日期:2012-10-15 发布日期:2012-09-17
  • 通讯作者: 袁建 E-mail:yjian_nj@163.com
  • 基金资助:

    国家科技部十一五支撑项目;江苏省教育厅重点自然基金项目;江苏省科技厅自然科学基金项目

Moisture Adsorption and Desorption Characteristics of Wheat Flour

  • Received:2011-08-25 Revised:2012-08-29 Online:2012-10-15 Published:2012-09-17

摘要: 在4种温度(10、20、30、40℃)和相对湿度11%~87%的条件下,采用静态平衡称量法测定高、中、低筋小麦粉的吸附与解吸平衡水分,并绘制吸湿等温线,拟合Logistic模型建立吸湿等温线的经验公式。结果表明:在特定温度条件下,高、中、低筋小麦粉的吸湿等温线基本重合,吸湿等温线为“S”型;以中筋小麦粉为实验对象时,得出了以下结论:在等温线图中,10、20、30℃吸湿等温线依次向右下方移动,40℃吸湿等温线与30℃的基本重合;在10、20、30℃条件下,存在吸附滞后现象,温度越低,滞后环越明显。在40℃条件下,未出现滞后现象。建立的吸湿等温线经验公式是有效的。

关键词: 小麦粉, 吸附, 解吸, 吸湿等温线

Abstract: High-gluten, middle-gluten and low-gluten wheat flours were determined by static equilibrium gravimetric method for adsorption and desorption equilibrium moisture contents under different conditions of temperature (10, 20, 30 ℃ and 40 ℃) and humidity (11%—87%). Based on the obtained data, moisture adsorption isotherms were plotted and a logistic model was fitted to establish an empirical formula. Substantially the same moisture adsorption isotherms of high-gluten, middle-gluten and low-gluten wheat flours were observed as an ‘S’-shaped pattern under specific conditions. The adsorption isotherms of middle-gluten wheat four at 10, 20 ℃and 30 ℃ displayed a shift towards the bottom right of the coordinate. Middle-gluten wheat four revealed basically the same adsorption isotherm at 40 ℃ and 30 ℃. Adsorption hysteresis was observed at 10, 20 ℃ and 30 ℃ and the lower the temperature, the larger the hysteretic loop area. In contrast, hysteretic loop disappeared at 40 ℃. Therefore, a valid empirical formula of moisture adsorption isotherm for wheat flour has been developed in this study.

Key words: wheat flour, adsorption, desorption, moisture adsorption isotherm

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