Usability and correlation with latent fragrant substance of chemical component in flue-cured tobacco leaves in Kunming.

In order to better understand the quality characteristics of tobacco varieties in Kunming,this paper figured out CCUI(chemical component index validity) representing tobacco leaves quality using principle component analysis and fuzzy mathematical method;and carried out comprehensive evaluation on chemical component usability of fluecured tobacco varieties including Kunming K326,Honghuadajinyuan(Hongda),Yunyan 87,NC102 and NC297;and analyzed the relationship between major chemical components and pigment,polyphenol.The result indicated that:①the average concentration of total sugar,potassium,chlorine and the ratio of potassium to chlorine were at an appropriate level,while the reducing sugar and nicotine were high,and the content of total nitrogen,ratio of sugar to nicotine and ratio of nitrogen to nicotine were low;②the proportion of chemical component usability grades Ⅰ ~ Ⅳ of flue-cured tobacco leaves in Kunming were 5%,31%,50%,14%,respectively.The average CCUI was 0.5159,and CCUI in different varieties were Hongda Yunyan87 K326 NC297 NC102;③the contents of lutein,β-carotene were significant or highly significant negative correlation with the contents of chlorine and nicotine,while were significant positive correlation with ratio of sugar to nicotine,ratio of nitrogen to nicotine,and ratio of potassium to chlorine.