Effect of extrusion treatment on chemical composition and aroma of flue-cured tobacco leav-es for heat-not-burn cigarettes
In order to investigate the effects of different extrusion treatments on the chemical composition and main aro-ma components of flue-cured tobacco leaves for heat-not-burn cigarettes,flue-cured tobacco leaves were selected as raw materials,and the chemical components as well as the main aroma components under different extrusion treatments were analyzed via continuous flow analysis,high performance liquid chromatography(HPLC),and gas chromatography-ion mobility spectroscopy(GC-IMS),etc.Results indicated that the contents of water-soluble sugar,reducing sugar,total nitrogen and other conventional chemical components were significantly(P＜0.05)affected by the extrusion treat-ments.Compared with the leaves before treatment[(109.25±0.93)mg·g-1],the total phenolic content of flue-cured tobacco leaves after extrusion treatment at 140 ℃[(116.30±1.24)mg·g-1]was significantly increased.Differences in the content of flavor substances were observed between the flue-cured tobacco leaves before and after the extrusion treatments.The relative content of ethyl phenylacetate and 2-furfural in the extrusion treatment group at 140℃ and 160 ℃ increased,while the content of isobutyric acid,isoamyl alcohol decreased,which enhanced the caramel flavor in flue-cured tobacco and thus played the role of plumping smoke flavor.
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