Curing Characteristics Of HD Varieties And Curing Technology Optimization

In order to explore HD varieties CURing characteristics and CURING thebest technology, tests are carried out using electric-heated auto-controlled oven forbaking and curing barn, in-depth study of the effect of the "big red tobacco bakingmethod" different and process conditions on the physiological biochemical indexes oftobacco baking process, after baking, economic traits and appearance quality intrinsicquality, the results are as follows:1. The key point of different moisture treatment on tobacoo leaf physiologicaland biochemical characteristics,the quality of Flue-cured Tobacco lesf of HDvarieties.Comprehensive analysis shows that:The key point of different moisturetreatment on the curing process of HD varieties leaf physiological and biochemicalcharacteristics have obvious effect, in the treatment of B (dry bulb42℃, wet bulb37℃dry bulb54℃, wet bulb39℃) better, Its performance in the curing process for:curing to30h when the moisture content of tobacco leaf than the other treatment wasthe highest; in6h~18h leaf respiration rate relative to other treatment is stronger;curing for PPO activity to36h maximum,after24h,curing tobacco peroxidase (POD)activity than the other treatment was the highest; curing for30h before treatment Dand treatment B MDA content in tobacco leaves has been low, curing30h~36h stage,B activity was lower than the lower, curing to36h MDA content of B in tobaccoprocessing significantly lower than other treatments. The content of MDA and36hcuring the tobacco in the order: CK> C> A> D> B. Leaf membrane lipidperoxidation level low,Maintain high activity of antioxidases over a longer period oftime, so that leaf metabolism activity time is relatively long, MDA accumulation andslow, which is favorable for the formation of tobacco leaf quality. After30h, tobaccoleaf chlorophyll content was the lowest; Carotenoid content is higher, butafter12h,decreased significantly and the lowest content when on36h.Flue-cured tobacco quality, appearance, leaf thickness is moderate (110um), leafweight (78.21g/m2) medium, equilibrium moisture content (12.74%) is higher, fillingvalue (4.98cm3/g) the highest, The appearance quality index of tobacco leaves is the best. The chemical composition, two sugar content is slightly high, protein ismoderate content.nicotine, total nitrogen content is slightly lower, but the proportionof more coordinated, Aroma components of high content of aroma components oftobacco, smoking quality better, leaf aroma is better. the amount of the full aroma,texture delicate, moderate concentration, slightly stimulated, miscellaneous gas lighter,taste good.2. Effects of leaf-drying stage of HD CURing quality at Rate control at differenttemperature.Treatment of T1with (dry bulb temperature from42℃to1℃/2h to46℃, wetbulb temperature37.5±0.5℃, constant temperature to reach the yellow leaf andstem and little drum. With at1℃/3h to55℃, wet bulb temperature at39.5±0.5℃,constant temperature to reach dry leaf and big drum. Specific performance: theeconomic characteristics, expression is: Orange group of tobacco leaf (94.12%) themost, the highest price (15.94yuan),first-class tobacco leaf (53.09%), secondary–class tobacoo leaf (92.11%) the largest proportion; Appearance quality, compared toother treatment of tobacco leaf color, oil has at most, loose structure, identity ismoderate; the chemical composition of tobacco leaves, the ratio of nitrogen tonicotine (1.04) appropriate, chlorine content (0.16) improved, but there are alsodisadvantages two higher sugar content; Aroma components, five kinds of aromacomponents and total amount were higher than those of the other treatments; smokingquality of tobacco leaf aroma, aroma quantity (12.11), The content of aroma(17.95),Aftertaste,(19.77), combustion (3.15), grey (3.82), the total score (79.93) areequal to or higher than the other treatments, but there irritation (8.17) slightly largerproblems.Generally speaking, HD variety CURing process in later yellowing stage drybulb temperature42℃need to cooperate with the humidity conditions of37℃, drybulb temperature of54℃need to cooperate with the humidity conditions of39℃. Toensure complete wilting leaves at42℃,Synthesis of aroma substances at54℃. curing HD tobacco leaf in leaf-dryingstage from42℃to46℃heating rate maintained at about1℃/2h, from46℃to55℃heating rate maintained about at1℃/3h. The appearance quality of flue-curedtobacco leaves,The intrinsic chemical composition,Aroma substances,Smokingtobacco sensory evaluation and comprehensive quality is better.HD variety curingprocess in the slow heating color quality of flue-cured tobacco leaf is best.