普鲁兰基多糖成膜溶液干燥动力学研究
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(1. 湖南农业大学食品科学技术学院,湖南 长沙 410128;2. 食品科学与生物技术湖南省重点实验室,湖南 长沙 410128)

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周雨佳(1992—),女,湖南农业大学在读硕士研究生。E-mail: zhouyujia92613@163.com

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国家自然科学基金青年项目(编号:31401658);湖南省教学厅优秀青年项目(编号:13B048)


Drying kinetics of pullulan-based film forming solutions
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(1.College of Food Science and Technology, Hunan Agricultural University, Changsha, Hunan 410128, China;2.Hunan Provincial Key Laboratory of Food Science and Biotechnology, Changsha, Hunan 410128, China)

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    摘要:

    研究普鲁兰及普鲁兰—聚乙二醇可食用成膜溶液的干燥动力学。结果表明:所有样品在干燥过程中分为加速、降速和平衡3个阶段。纯普鲁兰样品干燥过程符合Wang and singh模型,普鲁兰—聚乙二醇复合膜液则符合Modified Henderson and pabis模型。当干燥温度由40 ℃升高到70 ℃,普鲁兰膜液的有效水分扩散系数从0.019 6×10-11 m/s2增至0.255 7×10-11 m/s2,而普鲁兰—聚乙二醇复合样品从2.400×10-11 m/s2增至11.388×10-11 m/s2。可见随着干燥温度的升高,膜液的有效水分扩散系数值也随之变大;并且在相同干燥温度下,普鲁兰膜液的有效水分扩散系数值比普鲁兰—聚乙二醇复合样品要低。通过Arrhenius类型方程计算得到普鲁兰膜液的干燥活化能为9 114.8 kJ/mol,而普鲁兰—聚乙二醇复合膜液干燥活化能为 2 475.2 kJ/mol。

    Abstract:

    The drying kinetics of pullulan and pullulan-PEG film forming solutions were investigated. The results were as followed: the drying curves of pullulan-based films were divided into three stages: the rising rate, the falling rate, and the constant rate period; four mathematical models were fitted to the experimental data; among the drying models considered, the Wang and singh model was found to satisfactorily describe the drying kinetics of pullulan solutions. However, Modified Page equation-II model was found to satisfactorily describe the drying kinetics of pullulan-PEG solutions. As the drying temperature increased from 40 ℃ to 70 ℃, the effective moisture diffusion coefficient (Deff) of pullulan and pullulan-PEG samples increased from 0.019 6×10-11 m/s2 to 0.255 7×10-11 m/s2, and from 2.400×10-11 m/s2 to 11.388×10-11 m/s2, respectively. As the drying temperature increased, Deff of pullulan based film forming solutions increased, whereas the Deff of pure pullulan samples was lower than that of pullulan-PEG. Moreover, drying activation energy of pullulan and pullulan-PEG blend samples was 9 114.8 kJ/mol, and 2 475.2 kJ/mol, respectively.

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周雨佳,肖茜,卢星池,等.普鲁兰基多糖成膜溶液干燥动力学研究[J].食品与机械,2015,31(6):11-16.
ZHOUYujia, XIAOQian, LUXingchi, et al. Drying kinetics of pullulan-based film forming solutions[J]. Food & Machinery,2015,31(6):11-16.

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  • 收稿日期:2015-09-21
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  • 在线发布日期: 2023-03-17
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