密集烘烤后期湿度对烤烟香气品质的影响

为了进一步改善烟叶香气品质和优化密集烘烤工艺,在四川省凉山州以云烟85中部叶和上部叶为试验材料,研究了密集烘烤定色后期(47℃～54℃)、干筋前期(54℃～60℃)、干筋后期(60℃～68℃)不同湿度处理对烤后中上部烟叶致香物质和评吸质量的影响.结果表明,密集烘烤后期高湿(T6)能显著提高中部烟叶致香物质总量和新植二烯含量,低湿处理(T1)的大部分致香物质含量较低,但以T3(定色后期低湿度,干筋期高湿度)处理各类致香物质含量最高,且感官评吸质量最佳;在上部叶中,各类致香物质(除新植二烯)和致香物质总量以定色后期和干筋前期低湿,干筋后期高湿(T5)处理最高,评吸质量以T5处理最好,T6处理其次;相关分析表明,大部分评吸指标与各类致香物质之间呈正相关,且不同部位烟叶各指标间的相关性强弱有所不同,中部叶大部分指标间的相关性要好于上部叶.综合考虑,在试验中,中部叶烘烤后期湿球温度以T3(定色后期36℃～37℃,干筋前期39℃～40℃,干筋后期41℃～42℃)、上部叶以T5(定色后期36℃～37℃,干筋前期37℃～38℃,干筋后期41℃～42℃)处理为最佳,能改善烟叶香气品质.

Effects of Different Humidity During the Later Stage of Bulk Curing on Aroma Quality of Flue-Cured Tobacco Leaf

To improve the aroma quality of tobacco leaf and optimize the curing technology,the middle and upper leaves of the flue-cured tobacco variety Yunyan 85 produced in Liangshan of Sichuan province were used to study the effects of humidity during later process of bulk curing(47 ℃~68 ℃) on the aroma components and the smoking quality of the tobacco leaves.The results showed that the treatment of high humidity(T6) during later process of bulk curing remarkably increased the total content of aroma components and neophytadiene in the middle leaves;while the contents of most aroma components were the lowest in the low humidity treatment(T1).But treatment T3(low humidity during the later leaf-drying stage and high humidity during stem drying stage) had the highest content of all kinds of aroma components and the best smoking quality.For the upper leaves,the contents of all kinds of aroma components(except megastigmatrienones) and the total content of aroma components in T5(low humidity in the later leaf-drying stage and the earlier stem drying stage,and high humidity in the later stem drying stage) were the highest.Treatment T5 had the best smoking quality,followed by T6.Correlation analysis showed that most smoking indexes were positively correlated with aroma components and that the middle leaves had better correlation than the upper leaves.In conclusion,the middle leaves with T3(the wet bulb temperature was 36 ℃~37 ℃ in the later leaf-drying stage,39 ℃~40 ℃ in the earlier stem drying stage and 41 ℃~42 ℃ in the later tem drying stage) and upper leaves with T5(36 ℃~37 ℃ in the later leaf-drying stage,37 ℃~38 ℃ in the earlier stem drying stage and 41 ℃~42 ℃ in the later stem drying stage) could improve the aroma quality of tobacco in this experiment.