烟丝组织结构与平衡含水率的关系

为了解烟丝组织结构与保润性能的关系,应用扫描电子显微镜(SEM)观察了烤烟、白肋烟、香料烟3种烟丝表面和切面结构,光学显微镜观察烟丝下表皮气孔,比表面积测试仪测定烟丝毛细管比表面积大小。结果表明:①香料烟结构最为紧密,切面含有很多空隙结构,国产烤烟和津巴布韦烤烟的切面较疏松。②白肋烟气孔数目在烤烟与香料烟之间,同一品种烤烟不同部位烟丝样品比表面积大小:中部 >下部 >上部。③低湿度(RH=30%)环境条件下烟丝组织结构与平衡含水率正相关;高湿度(RH=60%)环境条件下,烟丝组织结构与平衡含水率负相关,随着相对湿度的增加,烟丝表面化学成分对含水率的影响程度逐渐加强。 

Relationship Between Tissue Structure of Tobacco Shreds and Equilibrium Moisture Content Thereof

To Study the relationship between tissue structure of cut shreds and moisture retentivity thereof,the surface and sectional structures of flue-cured,burley and oriental tobacco shreds were observed by a scanning electron microscope,the stomas of under epidermis were observed by an optical microscope,and the capillary specific surface area was measured by a specific surface area tester.The results showed that:1) The structure of oriental tobacco was the closest and its section was of porous structure,the section of domestic and Zimbabwean flue-cured tobacco was opener.2) The stoma number of burley tobacco was higher than that of flue-cured tobacco,while lower than that of oriental tobacco.The stalk positions of flue-cured tobacco of the same variety in the order of specific surface area were middle >lower >upper.3) The tissue structure positively correlated to equilibrium moisture content of tobacco shreds in low humidity(RH=30%) environment,while their correlation became negative in high humidity environment(RH=60%);and the influence of surface chemical composition in tobacco shreds on moisture content increased gradually with the rise of relative humidity.