WS系列凉味剂的热分析  

Thermal analysis of WS series cooling agent

作　　者：李奕蓉 朱瑞芝 蒋薇 蒋丽红[2] 杨继 LI Yi-rong;ZHU Rui-zhi;JIANG Wei;JIANG Li-hong;YANG Ji(Technology Center of Yunnan China Tobacco Industry Co.,Ltd.,Kunming,Yunnan 650231,China;School of Chemistry and Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650106,China)

机构地区：[1]云南中烟工业有限责任公司技术中心,云南昆明650231 [2]昆明理工大学化学与工程学院,云南昆明650106

出　　处：《食品与机械》2022年第9期77-82,218,共7页Food and Machinery

基　　金：中国烟草总公司重大专项(编号:110202101019[XX-05]);云南中烟工业公司科技开发计划(编号:2021JC05)。

摘　　要：目的:评价烟用WS系列凉味剂的安全性。方法:采用热裂解—气相色谱—质谱联用(Py-GC/MS)法和热重(TG)法研究了烟草中WS系列凉味剂在不同氛围和升温条件下的热解行为及其含量分布规律。结果:通过TG/DSC分析,WS-3、WS-5、WS-23均只有一个明显热失重阶段,最大失重率分别发生在251.8,281.6,206.5℃,3种凉味剂失重之前均出现了尖锐吸热峰,发生了熔融的相变过程,可能是晶型的转换或晶体溶解;在模拟卷烟燃烧的含9%氧气的氮氧混合气氛围下,3种凉味剂的裂解产物和数量均随温度的升高而增加,相比较而言,WS-3和WS-23较稳定,热裂解产物较少,而WS-5较不稳定,晶型转变所需热量最低且完全失重所需热量最少,热裂解产物相对较多;3种凉味剂热裂解结果主要是原型转移,原型转移峰面积归一化百分含量均在99%以上。结论:WS-3、WS-5、WS-23 3种凉味剂在加热条件下的裂解产物中未出现HPHCs或SVHC名单上的物质,且能够在350℃以前完全热解,均适合作为添加剂运用于加热卷烟。Objective: Evaluation of the safety of WS series cooling agents for cigarettes. Methods: In this paper, pyrolysis-gas chromatography-mass spectrometry(Py-GC/MS) and thermogravimetric(TG) methods were used to study the pyrolysis behavior and content distribution of WS series cooling agents in tobacco under different atmospheres. Results: Through TG/DSC analysis, WS-3, WS-5, and WS-23 had only one obvious thermal weight loss stage, and the maximum weight loss rates occurred at 251.8, 281.6, and 206.5 ℃, respectively. The three cooling agents all showed sharp endothermic peaks before weight loss, and a phase transition process of melting occurred. It was speculated that it may be the transformation of crystal form or the dissolution of crystal. Under the atmosphere of 9% oxygen-containing nitrogen-oxygen mixture simulating cigarette combustion, the cracking products and quantities of the three cooling agents increased with the increase of temperature. In comparison, WS-3 and WS-23 were more stable, with less thermal cracking products, while WS-5 was less stable, the heat required for crystal transformation was the lowest and the heat required for complete weight loss was the least, and the thermal cracking products were relatively more. The thermal cracking results of the three cooling agents were mainly prototype transfer, and the normalized percentage content of the peak area of prototype transfer was above 99%. Conclusion: The three cooling agents, WS-3, WS-5, and WS-23, do not appear in the list of HPHCs or SVHC under heating conditions, and can be completely pyrolyzed before 350 ℃, they are all suitable as additives for heating cigarettes.

关 键 词：加热卷烟 WS凉味剂 热裂解 热重法 

分 类 号：TS426[农业科学—烟草工业] O657.63[理学—分析化学] O657.99[理学—化学]