为研究温度对烟草热分解的影响,采用热重-冷阱-气相色谱/质谱(TGA-CT-GC/MS)联用技术,在氧气浓度为10%的氮/氧混合气氛下,对不同烟草原料(烤烟、白肋烟、香料烟、晒烟、再造烟叶基片)的烟丝进行热分析,利用冷阱捕集逸出物成分,然后进行GC/MS分析.结果表明:①在150℃左右时,表面的部分烟丝样品成分已发生热分解,300℃左右时完全炭化,香味成分得到有效释放;②烟碱的释放量随着温度的升高而逐步增加,在250℃及以上趋于稳定;③不同烟草原料的热解成分存在差异,逸出物中酸性成分与碱性成分的相对含量比值以晒烟最低,约为0.2,再造烟叶基片最高,约为2.6.%To investigate the influence of heating temperature on tobacco decomposition, thermogravimetric analysis coupled with cold trap and gas chromatography-mass spectrometry(GC/MS)was used to study the thermal decomposition process of tobacco materials, including flue-cured, burley, oriental, sun-cured tobacco and paper based reconstituted tobacco in 10% oxygen and 90% nitrogen atmosphere. Released components from thermal decomposition were trapped by a cold trap linked to a pyrolyzer and qualitatively analyzed by GC/MS. The results showed that: 1)Surface components in cut-tobacco decomposed initially at 150 ℃, carbonized at 300 ℃ followed by aroma component release. 2)The release of nicotine increased with the rise of temperature, and tended to be stable at or above 250 ℃. 3)Decomposition components from different tobacco materials were different in chemical compositions. The acidic/basic component ratio in the emissions was 0.2(the lowest)for sun-cured tobacco and 2.6(the highest)for paper base of reconstituted tobacco.
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