对上部烟叶和中部烟叶中致香成分的差异性进行了分析. 首先,利用液相色谱-气相色谱-质谱联用法测定烟叶样品内的中性致香成分,包括茄酮、二氢猕猴桃内酯、巨豆三烯酮等共11种; 其次,利用遗传算法筛选出影响上部烟叶和中部烟叶差异性的8种致香成分,进而建立了基于致香成分的上部烟叶和中部烟叶支持向量机分类判别模型,建模、留一法和预报和准确率分别为88.65%, 84.40%和82.86%;最后, 利用Fisher判别矢量方法考察上部烟叶和中部烟叶的空间分布.结果表明, 3-羟基-$\beta$-二氢大马酮、巨豆三烯酮和茄酮是影响上部和中部烟叶差异性的3种主要致香成分,可为烟叶质量管理中烟叶的部位特征和香气控制提供参考.

The difference of aromatic components in the upper part and middle part of tobacco leaves was analyzed. Eleven different aromatic components, including solanone, dihydroactinidiolide and megastigmatrienone, were separated successfully through the HPLC-GC-MS system. Then eight aromatic components were selected as the major variants that caused the difference in tobacco odor by genetic algorithm. After that, a model that distinguishes the upper part and middle part of tobacco leaves was establishedby support vector machine. The accuracy of the proposed model, Leave-one-out cross-validations and the accuracy for forecasting unknown samples reached 88.65%, 84.40% and 82.86%respectively. Finally, Fisher discriminant vector method was used to distinguish the distribution of aroma on the upper part and middle part of tobacco leaves. The result shows that 3-hydroxy-$\beta $- dihydrogen ketone, megastigmatrienone and solanone were three major aromatic components that contribute to the difference in the upper part and middle part of tobacco leaves. This study is meaningful in that it provides help for tobacco leaves quality control and aroma control in the tobacco industry.