氨基酸/甘油复合物的制备及其烟草保润性能研究
Preparation of amino acid/glycerol complex and study on its tobacco moisturizing properties
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摘要: 【目的】 探究氨基酸与甘油通过超分子作用构建的新型烟草保润剂体系在烟草中的保润性能。【方法】 制备14种氨基酸/甘油复合物,通过热重分析、Zeta-电位测试、水分吸附实验、烟叶保润性能测试、分子动力学模拟及扫描电子显微镜等手段进行筛选,并探究复合物在烟草中的防潮与保润性能。【结果】 14种氨基酸/甘油复合物中,L-组氨酸/甘油复合物的稳定性最好;在20 ℃、相对湿度80%的条件下,L-组氨酸/甘油复合物的吸湿能力弱于甘油,可起到防潮作用;在20 ℃、相对湿度60%的条件下,L-组氨酸/甘油复合物的平衡含水率(13.27%)可满足烟草防潮保润需求。【结论】 L-组氨酸与甘油之间可通过超分子作用力而结合,并附着于烟叶表面,促使烟叶气孔闭合,减少水分流失或外界水分侵入,从而表现出良好的防潮保润效果。Abstract: 【Objective】 To investigate the moisture-retaining performance of a novel tobacco humectant system based on amino acid-glycerol supramolecular complexes. 【Methods】 Fourteen amino acid-glycerol complexes were synthesized and screened using techniques including thermogravimetric analysis, Zeta-potential measurement, water adsorption tests, tobacco moisture retention assays, molecular dynamics simulations, and scanning electron microscopy to evaluate their moisture-proof and moisture-retaining properties. 【Results】 Among the 14 complexes, the L-histidine/glycerol complex demonstrated superior stability. At 20 ℃ and 80% RH, it showed lower water adsorption capacity than glycerol, indicating its moisture-barrier function. At 20℃ and 60% RH, its equilibrium moisture content (13.27%) satisfied tobacco moisture protection requirements. 【Conclusion】 The complex forms via supramolecular interactions, adheres to tobacco leaf surfaces, and promotes stomatal closure to reduce water loss and prevent external moisture intrusion, thereby providing effective moisture-proof and moisture-retaining properties.
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