【摘要】 【目的】考察金钱草多糖保润剂对片烟原料干燥过程的影响规律,为从动力学角度理解保润剂对片烟原料的保润效果奠定理论基础。【方法】测试施加金钱草多糖保润剂的许昌片烟(X2F)原料在不同干燥温度的水分含量变化,确定原料水分散失的薄层干燥动力学方程,获得内部水分有效扩散系数及干燥活化能。【结果】金钱草多糖可增强片烟原料的持水能力,显著降低原料的干燥速率常数和水分有效扩散系数,添加纯水和施加保润剂原料的水分有效扩散系数分别在1.286 8×10-12～1.671 8×10-12m2/s和1.074 0×10-12～1.611 0×10-12 m2/s之间,干燥活化能分别为8.42 kJ/mol和13.9 kJ/mol。【结论】金钱草多糖可提高片烟原料的保润性能,二项分布指数函数模型和Page模型可较好地描述片烟原料水分散失历程,为从动力学角度理解保润剂对片烟干燥过程中水分散失的影响提供了思路。更多还原

【Abstract】 [Purpose]We investigated the effectual rule of Lysimachia christinae polysaccharide(LCP) as a humectant on drying process of flue-cured tobacco lamina to understand the effect of the humectant on moisture retention of flue-cured tobacco lamina from a dynamic perspective. [Method]The moisture content variation of Xuchang flue-cured tobacco lamina(X2 F) through adding L. christinae polysaccharides under different drying temperature conditions was tested, the thin layer drying kinetics equation for the material moisture loss was determined, and the internal effective moisture diffusivities and activation energies were obtained.[Results]LCPs could enhance the moisture holding capacity of flue-cured tobacco lamina and markedly reduce drying rate constant and effective moisture diffusivity; moreover, the effective moisture diffusivities of adding pure water and applying humectant materials were 1.286 8×10-12-1.671 8×10-12 m2/s and 1.074 0×10-12-1.611 0×10-12 m2/s,respectively, and the drying activation energies were 8.42 kJ/mol and 13.9 kJ/mol, respectively.[Conclusion]LCPs could increase the moisture retention of flue-cured tobacco lamina materials.Two-term exponential model and Page model could better describe water desorption course for fluecured tobacco lamina materials, and this work would provide ideas for understanding the effect of humectant on water desorption during the drying process of flue-cured tobacco laminas.更多还原