采用热失重分析法(TGA)和在线热裂解气相色谱-质谱法(Py-GC-MS)研究了黄芩浸膏热裂解性质。在氦气氛围中,将黄芩浸膏分别在300,450,600,750,900 ℃下进行热裂解,并以气相色谱-质谱法对其裂解产物进行定性和半定量分析,并用黄芩浸膏进行了卷烟加香试验。结果表明:① 在热失重曲线图中不能较明显地看出黄芩浸膏的较大失重点;② 黄芩浸膏在上述温度下检测到的主要挥发性热裂解产物分别为12,18,28,42,40种;③ 600 ℃以下,黄芩浸膏热裂解产物主要是醛类、酮类、酯类和呋喃类物质;有害物质的量随着温度的升高而提高;900 ℃时,则主要为苯、甲苯、萘等有害成分;④ 黄芩浸膏具有提高卷烟香气质量、改善余味、柔和烟气的作用。

Pyrolytic properties of Scutellaria baicalensis extract were studied by thermogravimetric analysis and on-line pyrolysis, and GC-MS in hyphenation (Py-GC-MS). In a helium atmosphere, the extract was pyrolyzed at 300, 450, 600, 750, and 900 ℃, separately, and the pyrolytic products were directly introduced into the instrument and analyzed qualitatively and semi-quantitatively. The extract was added into cigarettes as a flavor. The results showed that: ① large mass loss point of the extract was not seen clearly in the thermo-mass loss curve; ② number of pyrolysates obtained separately at 300, 450, 600, 750 and 900 ℃ were 12,18,28,42 and 40 respectively; ③ the pyrolytic products obtained below 600 ℃ were mainly aldehydes, ketones, esters and furans; the amounts of hazardous substances released was found to increase gradually with the increase of pyrolytic temperature; pyrolytic products obtained at 900 ℃ were mainly benzenes, toluenes and naphthalenes; ④ the extract as an additive for cigarettes improved and modified the flavor of cigarette smoking, enhance the notes of fresh aroma, and softness of the cigarette smoke.