不同干燥强度下叶丝香味成分的主成分聚类分析

Principal component cluster analysis of aroma components in cut tobacco strips under different drying intensities

采用中心切割二维气相色谱-质谱法测定了不同部位原料叶丝在不同干燥方式和加工强度下的烟气粒相香味成分,采用主成分分析和聚类分析对香味成分进行归类。结果表明:1茄酮、3-羟基-β-二氢大马酮、新植二烯、二氢猕猴桃内酯在第一主成分中起主要作用,吲哚、糠醛、喹啉、甲基吡嗪在第二主成分中起主要作用。2依据香味成分的相对量,每个部位叶丝对应的不同干燥方式和加工强度可分为3类。上部叶,滚筒低强度和中强度以及气流中强度、滚筒高强度和气流高强度、气流低强度分别归为一类;中部叶,滚筒中强度和高强度以及气流低强度、气流中强度和高强度、滚筒低强度分别归为一类;下部叶,气流中强度和高强度以及滚筒高强度、滚筒低强度和中强度、气流低强度分别归为一类。根据不同的烟叶特性,应选择不同形式、不同强度的干燥方式以得到理想的卷烟香味风格。

The aroma components in mainstream smoke particulate matter of cut tobacco strips from different stalk positions dried under different methods and intensities were determined by heart-cut multidimensional gas chromatography-mass spectrometry. The experimental data were categorized by principal component analysis and cluster analysis. The results showed that： 1） Solanone, 3-hydroxy-β-damascone, neophytadiene,dihydroactinidiolide dominated the first principal component, as did indole, furfural, quinoline,2-methylpyrazine in the second principal component. 2） On the basis of relative amounts of the aroma components, the cut strips from each stalk position dried under different methods and intensities could be grouped into three categories. For the upper leaves, the three categories were cut strips dried by cylinder drying under low or medium intensity and by pneumatic drying under medium intensity, those dried by cylinder or pneumatic drying under high intensity, and those dried by pneumatic drying under low intensity separately. For the middle leaves, the three categories were cut strips dried by cylinder drying under medium or high intensity and by pneumatic drying under low intensity, those dried by pneumatic drying under medium or high intensity,and those dried by cylinder drying under low intensity separately. For the lower leaves, the three categories were cut strips dried by pneumatic drying under medium or high intensity and by cylinder drying under high intensity, those dried by cylinder drying under low or medium intensity, and those dried by pneumatic drying under low intensity separately. It is recommended that for obtaining cigarettes of an ideal flavor style, cut strips should be dried by proper means under proper intensity according to the characteristics of tobacco leaves.