A study on chemical components in flue-cured tobacco and correlation with grades and alcoholization duration of tobacco.

The main chemical components in nine Yunnan flue-cured tobaccos cv.K326 sampled at dif-ferent alcoholization durations and grades were determined by Near-infrared Spectroscopy technique and the pH of the samples was also detected.The results showed that:1) the contents of total nitrogen,nicotine and alkali decreased with the extension of aging time,and that of protein did not change obviously;2)the contents of reducing sugar,total sugar and cellulose changed irregularly,which were closely related to the tobacco grades.For tobacco leaves B3F,the content of reducing sugar increased and then decreased,the content of total sugar decreased gradually,and the content of cellulose decreased and then increased;for tobacco leaves C3F,the content of reducing sugar increased all the time,the content of total sugar decreased and then increased,and the content of cellulose increased;for tobacco leaves X3F,the content of reducing sugar decreased and then increased,the content of total sugar decreased and then increased,and the content of cellulose increased and then decreased;and 3) the pH of the tobacco leaves decreased with the prolongation of aging time,and the pH of the middle tobacco leaves changed less than that of upper and lower tobacco leaves.