为研究紫外辐照对烟叶内在品质的影响，选择复烤后的云南曲靖B2F烟叶制备3种不同加工状态样品（片烟、烟丝和烟丝加料），在封闭室内进行不同时间的紫外辐照，然后测定不同样品水溶性糖、烟碱、氯和钾含量，根据化学成分变化选择紫外辐照2.5 h片烟进行GC/GC-TOFMS分析，同时进行感官评价。结果表明，在UV/O3并用的相乘作用下（185 nm波长的紫外线使空气中的O2变成O3），辐照2.5 h的片烟样品中水溶性糖和烟碱含量的变化较大，氯呈下降趋势，钾含量基本不变。GC/GC-TOFMS香味物质分析表明，比对照样品含量增长了20%的典型香味物质有39种，新生成的香味物质有18种。感官评价结果显示，紫外辐照后的样品香气质有较明显提高，香气量略有上升，劲头下降明显。说明紫外辐照技术对提升卷叶内在品质是有效可行的。%To investigate the effect of UV radiation on internal quality of tobacco top leaves, Cured B2F leaves from Qujing, Yunnan were collected and three processing samples (sheet tobacco, tobacco and tobacco feeding) were irradiated in close chamber by ultraviolet for different period. Then soluble sugar, alkali, chloride and potassium content of each sample were measured and then sheet tobacco was chose for GC/GC-TOFMS analysis and sensory evaluation. The results showed that treatment of UV/O3 and UV irradiation for 2.5 hours to sheet tobacco, soluble sugar and alkali contents changed greatly, and chloride content decreased slightly. Fragrance substance analysis by GC/GC-TOFMS showed that the treatment cause the 39 kinds of fragrance substance contents increased by 20%, and generated 18 new fragrance substance. Sensory evaluation showed that UV irradiation significantly improved aroma and strength decreased significantly.
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