Study on Degradative Characteristics of Tobacco Starch with Non-crystallized Granule State by Microorganisms during Flue-curing

LI Tong-shuai1,SONG Zhao-peng1,MI Jian-hua2,CHENG Long1,LIU Chuang1,GONG Chang-rong1(1.College of Tobacco Science,Henan Agricultural University,Zhengzhou 450002,China;2.Dali Tobacco Company of Yunnan Province,Dali 671000,China)

Tobacco starch;Non-crystallized granule state;Microorganisms;Flue-curing;Degradative characteristics

【Objective】The changes of degradative characteristics of tobacco starch with non-crystallized granule state and structure of tobacco starch at different stages during flue-curing were studied in order to provide theoretical basis for the optimization of flue-curing technology.【Method】Using the optical microscope analytical method and the electrically-heated flue-curing barn designed and made by Henan Agricultural University,the degradative process of tobacco starch with non-crystallized granule state by microorganisms was investigated in detail.【Result】The results showed that under the conditions of high temperature,high humidity and microorganisms,the degradation of tobacco starch began in the cracking hole of starch granules,then the starch granules were gradually degraded by the microorganisms along the cracking hole,and disappeared eventually.【Conclusion】For native tobacco starch with compact crystallized structure without holes on the surface of starch granules,the degradative activity of microorganisms was much higher than that for tobacco starch with non-crystallized granule state.