Analysis of Thermogravimetric Characteristics and Stepwise Thermal Release Aroma Components of Different Types of Tobacco

LIANG Miao; LIU Yuxuan; ZHU Haibo; SU Man; ZHENG Yongjie; XIE Yifei; JIANG Xi; ZHANG Junsong; ZHU Yuanyang

doi:10.15933/j.cnki.1004-3268.2025.03.017

Abstract：In order to study the weight loss characteristics and component release characteristics of different types of tobacco leaves in different thermal weight loss temperature ranges,flue-cured tobacco,cigar tobacco and burley tobacco were used as the research subjects.By thermogravimetric analysis method and self-built programmed temperature control heating platform coupled with flue gas capture device,the thermal weight loss characteristics of different types of tobacco leaves and the heat release products under stepwise heating conditions were compared and analyzed.The results showed that the thermal weight loss process of different types of tobacco leaves could be divided into four stages,but the thermal weight loss characteristic parameters of each sample were different.The weight loss rate and maximum weight loss rate of flue-cured tobacco in stage Ⅱ were high,the initial decomposition temperature of cigar tobacco and burley tobacco was high,and the final decomposition temperature was low.Flue-cured tobacco had lower comprehensive pyrolysis index[9.84×10-5％/(min·℃2)]and residual mass(28.47％).The pyrolysis kinetics analysis showed that the activation energy(Ea)and pre-exponential factor(A)of flue-cured tobacco in stage Ⅱ were higher than those of cigar tobacco and burley tobacco.The Ea value of burley tobacco in stage Ⅲ was higher than that of flue-cured tobacco and cigar tobacco,while the Ea value of cigar tobacco in stage Ⅳ was higher than that of flue-cured tobacco and burley tobacco.Under the condition of stepwise heating,different types of tobacco leaves showed the highest weight loss rate in the thermal decomposition stage Ⅲ,and the weight loss rate of stage Ⅱ showed flue-cured tobacco＞cigar tobacco＞burley tobacco.The weight loss rate of flue-cured tobacco and cigar tobacco in stage Ⅲ was significantly higher than that of burley tobacco(34.60％).The heat release aroma products of different types of tobacco leaves in each heating stage were significantly different.The total amount of aroma substances released showed cigar tobacco(13 883.48 μg/g)＞burley tobacco(11 970.11 μg/g)＞flue-cured tobacco(8 753.42 μg/g).The content of aroma substances released in stage Ⅲ accounted for 42.86％,48.68％and 61.85％of the total content,respectively.In summary,the thermal weight loss characteristics and stepwise heat release aroma components of different types of tobacco leaves are different.The type of tobacco raw materials and the heat release components at the corresponding temperature should be considered in the formulation design of cigarette products.