| The scent style of flue-cured tobacco is affected by the ecological environment and the intrinsic quality of tobacco leaves.Based on the classification of the eight major flavors of Chinese tobacco,this study selected 84 varieties of flue-cured flue-cured tobacco from the southwest plateau,Chenhua tobacco,Guizhou-Guishan eco-region,36 sweet-flavored flakes,and Huanghuai plain eco-region.Desiccated sweet coke 48 kinds of aged tobacco leaves,descriptive statistics on the differences of conventional chemical composition,aroma substances and sensory quality of these three types of fragrance,statistics of the difference in intrinsic quality between different fragrance types,which is conducive to cigarettes Processing and production of industrial enterprises;selecting the three flavor-type aroma substances and the sensory quality indicators of flue-cured tobacco for simple correlation analysis and grey correlation analysis to find out the potential relationship between aroma substances and sensory quality between different fragrance types;Substance as an indicator,a discriminant analysis function was established to discriminate and analyze three flavored flue-cured tobaccos.The main results are as follows:1.Significant analysis was carried out on the conventional chemical constituents,organic acids,neutral aroma substances and sensory evaluation indexes of three flavor flue-cured tobaccos.The results showed that:(1)The content of total sugar,chlorine,potassium,total nitrogen,reducing sugar and ether in the conventional chemical composition showed extremely significant difference.Among them,the total content of sugars showed the trend of sweet and sweet type>honey sweet type>Jiao sweet focus type;the content of potassium in Jiaojiaojiao was the lowest,and the content of chlorine was the highest;the total nitrogen content of honey sweet type was extremely high.Significantly larger than the other two flavors,and the total alkaloids and protein content did not differ significantly among the three flavors;the sweet extracts had the lowest and extremely significant differences in ether extracts.(2)The content of succinic acid,lauric acid,palmitic acid and stearic acid in the non-volatile organic acid was not significantly different among the three scent types.The content of oleic acid is sweet and fragrant>sweet and fragrant>coke sweet and fragrant;the gualic acid,malic acid,malonic acid and citric acid are the highest in coke sweet coke;the sweet coke is sweet and sweet.The content of myristic acid was significantly higher than that of honey sweet;the linoleic acid content of honey sweet flavor was significantly lower than that of sweet sweet flavor;from the total amount of non-volatile organic acid,it was generally sweet and charred Type>honey sweet type>sweet and fragrant type.The indexes of volatile organic acids were analyzed.The total amount of volatile organic acids was sweet and sweet(14.74)>sweet and sweet(13.23)>honey sweet(12.45).Among them,n-butyric acid,β-methylvaleric acid,octanoic acid and citric acid had no significant difference among the three scent types.The content of heptanoic acid in honey sweetness is significantly larger than that in sweet and sweet coke;the content of caproic acid in honey sweetness is significantly less than that in sweet and sweet coke;the content of isovaleric acid is sweet and sweet>sweet and sweet>The trend of the scent type;the valeric acid content of the coke sweet coke type is significantly larger than the sweet scent type.(3)Analysis of neutral aroma substances,the total amount of neutral aroma substances is honey sweet type>sweet and sweet type>Jiao sweet focus type,the honey sweet type is significantly higher than the other two kinds of incense Type,the difference between sweet and sweet and non-sweet coke is not significant.Among them,the sweet-scented carotenoid degradation products,Maillard reaction products,aromatic amino acid degradation products,and neophytadiene content were significantly higher than the other two flavors,while the cedar-like degradation products were sweet and sweet.The sweet-sweet coke type is significantly higher than the honey sweet type.The sweet aroma type except for carotenoids is significantly higher than the sweet and sweet coke type.2.The simple correlation analysis and gray correlation analysis of the aroma components and sensory quality indexes of three flavor flue-cured tobaccos were carried out.The results are as follows:(1)The correlation between flue-cured tobacco flue gas and flue-cured flue-cured tobacco is non-volatile.Sexual organic acids,neutral aroma substances,honey sweet flavored flue-cured tobacco neutral aroma substances and sweet and fragrant flue-cured tobacco non-volatile organic acids.Corresponding to the taste characteristics of flue-cured tobacco,the volatile organic acids of sweet and fragrant flue-cured tobacco,and the sweet and fragrant volatile organic acids.On the whole,organic acids mainly affect the flue gas characteristics and taste characteristics of flue-cured tobacco.(2)The most relevant substances of aroma characteristics and taste characteristics of coke sweet coke flue-cured tobacco are β-ionone,succinic acid,and the degree of smoke characteristics.The largest ones are bismuth,malic acid,and the most relevant to the total sweetness of the coke sweet coke type.Dihydro kiwi lactone and myristic acid.The substances with the highest aroma characteristics,smoke characteristics and total scores of honey sweetness areβ-ionone and myristic acid,and the most relevant to the taste characteristics are benzaldehyde and stearic acid.The most relevant relationship between sweet and fragrant aroma characteristics is 2-acetylfuran;β-Damascone is the most relevant to the taste characteristics;the most relevant substance for the total sweetness and smoke characteristics of sweet and sweet type is two.Hydroxamarone;β-methylvaleric acid is the most relevant substance of all the sensory properties of the sweet and sweet type.3.Using 44 kinds of flue-cured tobacco aroma substances as indicators,a discriminant analysis method was used to establish three discriminant function models.Finally,11 variables are introduced into the discriminant function.The discriminant function was tested by variance,and the discriminant function was significantly different.At the same time,the original classification was used to verify the tobacco leaf samples,and the accuracy rate reached 86.24%.The cross-validation was used to verify the accuracy rate reached 84.39%.Using the new unknown sample for verification,the accuracy of the three fragrance types is 80%. |
