加热卷烟烟草材料分段裂解分析

利用热重法(TG)及热裂解-气相色谱质谱联用(PyGC/MS)法,对典型的中心加热(A)、周向加热(B)及传统卷烟(C)烟草材料进行了热行为分析。结果表明:①两种加热卷烟烟草材料的热失重分为3个阶段,主要的热失重阶段发生在242~350℃;传统卷烟烟草材料热失重分为4个阶段,主要的失重阶段发生在381~534℃,加热卷烟烟草材料相对于传统卷烟失重峰较宽,失重速率较缓慢。②随着裂解温度升高,3种烟草材料所检测到的化合物种类、数量逐渐增加。第2阶段甘油、丙二醇有较高的释放量,卷烟样品A甘油8.96%,丙二醇5.38%;卷烟样品B甘油24.65%,丙二醇13.82%;卷烟样品C甘油25.09%,丙二醇11.23%。加热卷烟烟碱释放量随温度变化呈先减后增再减的趋势,释放量在第1阶段达到峰值,A:84.50%,B:91.82%,传统卷烟烟碱释放量呈逐级递减的趋势,释放量在第1阶段达到峰值,71.41%。③加热卷烟主要裂解产物释放量于第1阶段达到峰值,传统卷烟于第2阶段达到峰值。两种不同的加热卷烟致香成分在第3和第4阶段均有较高的释放量且稳定。

Investigation of sectionalized pyrolysis behavior of heated cigarette tobacco materials

The thermogravimetry(TG)and pyrolysis-gas chromatography-mass spectrometry(Py-GC/MS)were used to analyze the thermal behavior of three tobacco materials,including typical center heated(A),circumferential heated(B)and traditional cigarette(C).Results showed as follows.① The thermal mass loss of the two types of heated tobacco materials could be divided into 3 stages,and the main thermal mass loss stage was 242~350℃;the traditional cigarette tobacco material thermal mass loss could be divided into 4 stages,and the main mass loss stage was 381~534 ℃.Compared with traditional cigarettes,the mass loss peaks of heated cigarettes were wider and the mass loss rate was slower.② With the pyrolysis temperature increased,the types and numbers of compounds by detected was gradually increased in three tobacco materials.The glycerin and propylene glycol had higher release amounts at stage 2,cigarette sample A contained 8.96%of glycerol and 5.38%of propylene glycol.However,24.65% of glycerol and 13.82% of propylene glycol were found in sample B.There were 25.09% of glycerin and 11.23% of propylene glycol in sample C.The release of nicotine in heated cigarette showed a trend of first decrease,then increase,and final decrease with temperature increased.The release amount reached the peak at stage 1 with sample A at 84.50% and sample B at 91.82%,respectively.However,the traditional cigarette nicotine release showed a gradual decreasing trend,and the release amount reached a peak of 71.41%at stage 1.③ The release of the main pyrolysis products of heated cigarettes reached its peak at stage 1,and that of traditional cigarettes reached its peak at stage 2.The aroma components of two different heated cigarettes had higher release amounts and were stable at stages 3 and 4.