摘要
采用热裂解和热重分析仪，研究了胆甾醇、豆甾醇、β-谷甾醇、麦角固醇和菜油甾醇的热裂解产生多环芳烃及其热失重行为，同时将胆甾醇、豆甾醇、β-谷甾醇和麦角固醇添加到卷烟中以验证甾醇添加量与多环芳烃释放量的关系。结果表明：①5种甾醇类化合物在高温、缺氧的环境下热裂解易于生成多环芳烃，尤其是低环数多环芳烃，5种甾醇的热裂解产物及其分布特点类似。以豆甾醇为例，其热裂解产物中萘及其衍生物占总量的35．44％；②5种甾醇只有-个热失重阶段，在300～400℃区间基本分解完全，推测裂解反应在热裂解过程中占主导因素；③卷烟中甾醇的添加量与主流烟气中苯并[a]芘（B[a]P）释放量呈明显正相关，其中，豆甾醇对B[a]P释放量的贡献最显著，两倍于卷烟中豆甾醇原含量的添加量，卷烟样品的B[a]P释放量增加了17．8％。
The generation of polycyclic aromatic hydrocarbons by pyrolysis of cholesterol, stigmasterol, β-sitosterol, ergosterol, campesterol and the thermogravimetric behavior of those sterols were investigated by pyrolysis instrument and thermogravimeter. Cholesterol, stigmasterol, β-sitosterol and ergosterol were added into cigarettes in order to validate the relationships between the sterol addition rate and the delivery of polycyclic aromatic hydrocarbons in mainstream smoke. The results showed that： 1） Polycyclic aromatic hydrocarbons, especially those having less rings, were generated from the five sterols in the environment of high temperature and hypoxia. The pyrolytic products from the said sterols and their distribution rules were similar. Taking stigmasterol as an example, naphthalene and its derivatives accounted for 35.44% of total pyrolytic products of stigmasterol. 2） Only one phase of weight loss was observed and the pyrolysis basically completed in the range of 300-400 ℃. It was speculated that cracking reactions might be the dominant factor in the pyrolysis process of the five sterols. 3） The addition rates of sterols in cigarette and the delivery of benzo[a]pyrene in mainstream smoke showed an obvious positive correlation; the contribution of stigmasterol was particularly significant, by adding 2 times its content in cigarette, benzo[a]pyrene delivery increased by 17.8%.
出处
《烟草科技》
EI
CAS
北大核心
2013年第9期54-57,共4页
Tobacco Science & Technology
基金
中国烟草总公司科技重大专项项目"卷烟烟气中苯并芘形成机理研究"(110201001001)
云南中烟工业公司科技开发计划"选择性降低烟草中苯并[a]芘前体化合物减害配方技术研究"(2012JC02)
关键词
甾醇
热裂解
热重
多环芳烃
量效关系
Sterol
Pyrolysis
Thermogravimetric analysis
Polycyclic aromatic hydrocarbon
Dose-response relationship
