摘要: Three types of tobacco samples, namely, flue-cured, burley and oriental tobaccos were pyrolyzed isothermally in an atmosphere of 9% oxygen in nitrogen using a modified micro-furnace pyrolyzer from 300℃ to 900℃ with a 100℃ interval. The gas phase compositions of pyrolytic products were trapped by thermal desorption tubes (Carbotrap 349) and then analyzed by an automated thermal desorption-gas chromatography/mass spectrometry (TD-GC/MS) under scan mode. The effects of pyrolysis temperature and tobacco types on the yields of gas phase compositions were investigated. The results indicated that pyrolysates with more stable molecular structure were released at a higher temperature. The majority of toxic compounds were generated at above 500℃, while most flavor compounds were released at lower temperatures. In this study, flue-cured tobacco samples released more carbonyl compounds and furans than those of burley and oriental tobacco samples. On the other hand, burley tobacco samples yielded significantly more nitrogen-containing compounds compared to flue-cured and oriental tobacco samples. Results obtained from this study can provide useful information to understand smoke formation mechanism and offer guidance on toxicant reduction.