为了实现烟梗的高值化利用，采用超临界 CO₂ 萃取法提取烟梗中的香味成分，制 备具有烟草本香的浸膏． 以烟草浸膏收率为指标，采用单因素试验及正交试验优化萃取工 艺，用气相色谱 － 质谱法分析了所得烟草浸膏的成分． 优化后的最佳工艺条件为:萃取温 度 60℃，萃取压力 32MPa，CO₂ 流量 24L/h，萃取时间 2. 5h，使用体积分数为 85% 的乙醇 溶液为夹带剂，其在烟梗中的质量分数为 20%，此条件下浸膏得率为 1. 70%;烟草浸膏的 挥发物中共检测出27 种成分，含有多种烟草中的关键致香物质，如 β-二氢大马酮、巨豆三 烯酮、西柏三烯醇、香叶基丙酮、新植二烯等．

In order to implement the high-valued utilization of tobacco stem,supercritical CO₂ fluid extraction was conducted to extract the flavor components from waste tobacco stem and to prepare essential oil with natural tobacco flavors.Then,by taking the extraction yield as an evaluation index,single-factor and orthogonal experiments were respectively carried out to optimize the extraction process,Finally,the flavor components in the obtained extracts were analyzed by means of GC-MS.The results show that,under the optimal extraction conditions,that is,an ex- traction temperature of 60 ℃,an extraction pressure of 32 MPa,a CO₂ flow rate of 24 L/h,an extraction time of 2. 5 h,when 85% ethanol solution with a mass fraction in tobacco stem of 20% is adopted as the entrainer,the ex- traction yield reaches 1. 70%; and that many important flavor components are contained in the 27 kinds of identi- fied components,such as β-damascenone,megastigmatrienone,β-cembrenediol,geranyl acetone,neophytadiene,and so on.