| On the basis of main tobacco-growing areas in China, the status of aroma index of flue-cured tobacco were analyzed, and the comparison of aroma index between domestic and high-quality tobacco-growing areas aboard were conducted.The similarity of aroma index in and aboard were analyzed by using the fuzzy priority similar ratio method. The relationship between aroma indexes and the other main chemical components, polyphenol compounds, organic acid, neutral aroma constituents as well as sensory quality of flue-cured tobacco leaves were also studied.The main results were as follows:1. On the basis of 324 flue-cured tobacco samples from main tobacco-growing areas of China, all-around descriptive statistics analysis for furfural, isovaleric acid, phenyl acetaldehyde, solanone, damascenone and megastigmatrienone of flue-cured tobacco leaves were done, of which were the components of aroma index. The results indicated that the content of furfural was highest (35.25μg/g); the next was megastigmatrienone (27.04μg/g) and solanone (23.67μg/g); isovaleric acid (4.74μg/g) was the lowest. The contents of four kinds of megastigmatrienone were different, which showed megastigmatrienone B>megastigmatrienone D>megastigmatrienone A>megastigmatrienone C. The variation of aroma components among tobacco samples was different, among which megastigmatrienone was biggest and furfural was lowest.2. Based on 294 tobacco samples in main tobacco-growing areas of China, the variation of aroma index of flue-cured tobacco leaves among different years, stalk positions and growing areas was analyzed. The results showed that aroma index among different years were different; A value were highest in 2000; B value were highest in both 2003 and 2004, and lowest in 2001. Aroma index AI was highest in 2000. Among stalk positions, A value appeared as middle leaf>lower leaf>upper leaf; B value appeared as lower leaf>middle leaf>upper leaf; aroma index AI were the same as B value. A value in Huanan was significant higher than Zhongnan; B value in Huanan and Zhongnan were higher; aroma index AI was highest in Huanan, but Huanghuai and North were significant lower than the other tobacco growing areas.3. On the basis of the digital data of flue-cured tobacco samples from 11 typical tobacco-growing provinces, the variation of aroma indexes in different representative flavor type tobacco-growing areas was contrasted. The results indicated that various types of flue-cured tobacco samples in different regions had a certain proportion of distribution. The delicate scent style tobacco was distributed over some counties in Guangdong, Sichuan, Fujian besides Yunnan, and aroma index appeared as Guangdong>Fujian>Yunnan >Sichuan, but were not significantly at 5% level. There existed a big variation of A value, B value and AI from Sichuan, and the quality stability was poor. For middle scent style tobacco leaves, the distribution regions were Fujian, Guangdong, Henan, Heilongjiang, Hunan, Jiangxi, Inner Mongolia, Shanxi, Sichuan, Yunnan, Chongqing besides Guizhou. The aroma index AI was highest in Fujian (1.24), but lowest in Sichuan (0.94). The variability of B value and AI in Hunan was bigger than the other province. For heavy style tobacco leaves, the distribution region was Guangdong, Hunan besides Henan, and the aroma index AI was highest in Guangdong, higher in Hunan and lowest in Henan.4. Variance analysis and fuzzy priority similar ratio methods were used to study the diversity and similarity of aroma index between tobacco-growing areas in and abroad. The results indicated that aroma index AI of Huanan was closer to America, but significant lower than Brazil and Zimbabwe. In Huanghuai and North tobacco-growing areas, the aroma index was significant lower than Brazil, Zimbabwe and America. For Zhongnan tobacco-growing areas, the aroma index was closer to America, but significant lower than Brazil and Zimbabwe. Aroma index in Xinan was significant lower than Brazil and Zimbabwe. Jiangxi aroma index was most similar to Brazil; Fujian aroma index was most similar to Zimbabwe; Guangdong aroma index was most similar to America. The similarity of aroma index between Shanxi and abroad was lowest.5. Based on the digital data of tobacco samples in main tobacco-growing areas, the relationship between aroma index and chemical composition, polyphenol compounds and organic acid was analyzed. The results indicated that aroma index AI had significant positive correlation with potassium, RS/N, TN/N, K/CL, succinic acid, malic acid, palmitic acid, oleic acid and heptylic acid, while had significant negative correlation with nicotine, reducing sugar, total sugar, total nitrogen, chlorogenic acid, rutin, phenols, oxalic acid, malonic acid and myristic acid. The aroma index was classified by using the method of K-means cluster analysis, and the results showed that TN/N was closer to 1 when in the low aroma index group. The contents of chlorogenic acid, rutin and non-volatile organic acid were high relatively. While in the high aroma index group, potassium- contents and K/CL were high, but the content of chlorine was low.6. By applying cluster analysis, correlation analysis and variance analysis, the relationship between aroma index and neutral aroma constituents as well as sensory quality of flue-cured tobacco leaves was studied. The results indicated that aroma index AI had significant positive correlation with neoplytadiene and total contents of aroma constituents. The contents of neoplytadiene and neutral aroma constituents were highest in the middle aroma index group, and higher in the high aroma index group, but lowest in the low aroma index group. Aroma index AI had highly significant positive correlation with sensory quality except strength and consistency; the score of aroma quality, aroma volume, strength, consistency, taste, ash, and burning conditioner were increased with the increasing of aroma index.
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