膨胀石墨吸附香料提高其在烟草薄片生产过程中耐热稳定性的研究

Study on Improvement of Heat Stability Resistance of Flavor Adsorbed with Expanded Graphit During Production Process of Tabacco Sheets

关键词:  膨胀石墨  烟草薄片  香料  吸附  耐热稳定性

Key Words:expanded graphite  tobacco sheets  flavor  adsorption  heat stability resistance

摘要:为提高烟草薄片生产过程香料的耐热稳定性，本研究利用膨胀石墨吸附香料，然后再将其加入到烟粉中制备烟草薄片，以减少香料中挥发性物质的损失。采用傅里叶变换红外光谱仪（FT-IR）、X射线光电子能谱仪（XPS）和高压压汞实验分析了膨胀石墨的表面功能基团和孔隙结构；利用气相色谱质谱仪（GC-MS）分析了香料中主要挥发性物质在烟草薄片干燥过程中的损失率。结果表明，膨胀石墨的表面存在羧基或酯基，具有高度孔隙结构，孔隙率为84.2%，孔隙连通性好，香料饱和吸附量较高，可达5.73 g/g。香料被膨胀石墨吸附后，可大大降低香料中挥发性物质在烟草薄片干燥过程中的损失，这表明膨胀石墨可以作为香料物质的吸附剂，应用到烟草薄片中。

Abstract:In order to improve heat stability resistance of flavor during production process of tabacco sheets， and reduce the loss of volatile substances in flavor， in this study， expanded graphite adsorbed with flavor was added to tobacco powder to prepare tobacco sheets. Surface functional groups and pore structure of expanded graphite were analyzed using Fourier transform infrared spectroscopy （FT-IR）， X-ray photoelectron spectroscopy （XPS）， and high-pressure mercury injection experiment. The loss rate of the main volatile substances in the flavor during the drying process of the tobacco sheets were analyzed using gas chromatography-mass spectrometry （GC-MS）. The results showed that carboxyl or ester groups existed on the surface of expanded graphite. Expanded graphite was a substance with high pore structure of 84.2%， had good pore connectivity， and high adsorption capacity for flavor， with a saturated adsorption capacity of 5.73 g/g. After being adsorbed by expanded graphite， the loss of volatile substances in flavor during tobacco sheets drying process could be greatly reduced. Expanded graphite could be used as an adsorbent for flavor and applied to tobacco sheets.