【摘要】 以云烟85、K326、红花大金元(HD)3个烤烟品种为供试材料,研究了不同烤烟品种烘烤过程中温湿度变化及烟叶脱水速率对烟叶膜脂过氧化作用的影响.结果表明:烟叶含水率的变化与烤房相对湿度的下降幅度密切相关;红花大金元烟叶对烤房温湿度的变化比云烟85、K326烟叶更为敏感,脱水速率更快;烟叶脱水速率过快是导致剧烈膜脂过氧化作用和丙二醛含量大幅升高的直接原因.烘烤过程中过氧化物酶的活性除受烤房温度的影响外,还与细胞膜过氧化导致丙二醛浓度升高有关.丙二醛可以作为烘烤过程中烟叶脱水速率和细胞膜结构破坏程度的指示性化合物.更多还原

【Abstract】 Effects of variations of temperature,humidity and dehydration rate on membrane lipid peroxidation of tobacco leaves during baking time were investigated,using three varieties of flue-cured toacco,Yunyan85,K326,HD as materials.Results showed that changes in contents of leaf moisture was closely related to decrease of relative humidity in the barn.HD tobacco was more sensitive to changes of temperature and humidity in the barn compared to Yunyan85,K326 expressed in its higher dehydration rate.Cellular leaf dehydration rate directly led to the increase of severe membrane lipid peroxidation and contents of MDA.In the process of baking,activity of peroxidase was directly affected by the temperature in the barn,as well as the crease of malondialdehyde concentrations and other inhibitors caused by celluar membrane peroxidation malondialdehyde can be used as a compound landmark to indicate leaf dehydration rate and degree of damage to cellular membrane structure.更多还原