Effects Of Flue-cured Tobacco Modulation On The Conversion Of Tobacco Pigmengt And The Influence Of Its Quality

In order to study the different modulation methods on the conversion of tobaccopigment and its effects on the quality of tobacco leaves of flue-cured tobacco, the differentpretreatments were made of then determine appropriate modulation technology according to thesituation of tobacco leaves, make comparison on physiological and biochemical status, tobacco curingprocess of pigment and water changes, content changes of chemical components of tobacco leaf duringbaking, neutral, the changes of the aromatic substance content and organic acids, polyphenols content,appearance quality traits and physical properties and the baking time, initially identified the modulatedmode the quality of tobacco leaves, the main results are as follows:1the impact on physiological and biochemical characteristics of Flue-cured tobaccoWith the growth of tobacco moisture reduce drying time, and affect the physiological andbiochemical changes of tobacco. Moisture content with the curing time, greatly reduce the time inadvance, the performance of the C1(tobacco mature picking rod knitting after air-curing48h beforebaking), C2(tobacco mature picking rod knitting in wooden cases air-curing48h before baking,wooden door open), C3(tobacco leaf maturity rod knitting in wooden cases air-curing48H beforebaking, wooden doors are closed) than B1(tobacco mature picking rod knitting after natural curing36h before baking), B2(tobacco mature picking rod knitting in wooden cases air-curing36h beforebaking, wooden door, B3(tobacco mature picking rod knitting in a wooden box curing36h beforebaking, wooden doors are closed) treatment appeared12h earlier, and the six treatments have twodecline period, A1(leaf maturity after picking up bar natural air-curing18h before baking), A2(leafmaturity after picking up bar in wooden cases air-curing18h before baking, wooden door open), A3(tobacco mature picking rod knitting in wooden cases air-curing18h before baking, wooden door closeall) only have a greatly reduced time, later than the previous six. So the drying time is the maineffect on the leaf water loss factor. B1, B2, B3treatment can improve the activity of lipoxygenase(LOX) and polyphenol oxidase (PPO), o lipoxygenase and polyphenol oxidase activity was higher onA3, B2, C1treatment t, with the curing time of lipoxygenase activity peak appeared in advance, Itsshows that C1, C2, C3appeared12h earlier compared with the other treatments. During themodulation process the change of water content and lipoxygenase activity in close relationships,except C3treatment, other treatments were approach significant and positive correlation. 2air-curing methods and time affect the degradation of leaf pigmentThe contents of chlorophyll a showed similar change curve with modulation under differenttreatments, the degradation rate and degradation time were different in different treatment, the contentof chloroplast a in roasted exhibited air-curing48h> air-curing36h> air-curing drying time18h, inchloroplast a that is the main effect of chlorophyll a content factor. The degradation of chlorophyll bduring modulation the overall trend is relatively smooth, the degradation of chlorophyll a mainlybefore72h, A3treatment in air-curing18h, B2treatment in air-curing36h, C1treatment in air-curing48h showed the lowest content. The carotenoids are presented firstly decreased and then increased andthen decreased, the drying process of carotenoids increased than the CK treatment in advance, androasted samples A2, B3, C2treatment was the lowest, its indicate that carotenoid pigment content waseffected bythe curing time and curing methods.3the flue-cured tobacco chemical composition and coordination was affected by air-curingmethods and timeThe coordination of chemical composition effected by tobacco air-curing process, the chemicalcomposition is more coordination of A3treatment in air-curing18h, B2treatment in air-curing36h,C1treatment in air-curing48h, its indicate that to effectively reduce the content of starch, suitablesugar content, sugar-nicotine ratio increasing, the ratio of nitrogen to nicotine fit, C3processing isrelatively poor. The total neutral aroma compounds in C1treatment was the highest, A3and B2werethe second, the content of C3and C2total neutral aroma compounds is less than CK treatment. Malicacid and citric acid content is an important contribution to the aroma quality in C1treatment was thehighest, followed by A3and B2treatment, the excessive content of fatty acid disadvantage in tobaccoquality in CK treatment was the highest, air-curing process were less than that of treatment CK.Polyphenol content drying processing showed increased at first and then decreasing, arrived peak at12h then degradation, CK processing for the inverted V curve, the increase in12h,48h,72h, roastedsamples, except for A1and A2treatment, the remaining air-curing process of polyphenol content thanCK treatment improved.4air-curing methods and time affect the leaf shape, physical properties and baking timeThe appearance quality and physical characteristics showed better performance in A3, B2, C1treatment, B3, C2, C3is a bit poor, poor performance of C3processing in physical property, chemicalcomposition is not harmonious, fine tobacco ratio is lower than the CK, in short, the worstperformance in the C3treatment. Curing processing of baking are less than CK processing, C3processing use least, followed by C2and C1treatments, each treatment in yellowing stage of baking and the entire baking exhibit as air-curing time prolonging time decreased, indicating the air-curingtobacco after modulation and the technology can shorten the baking time, energy conservation effect.