• Proceedings of the Korean Society of Crop Science Conference
• /
• 1990.10a
• /
• pp.42-43
• /
• 1990

• Journal of the Korean Society of Tobacco Science
• /
• v.1 no.2
• /
• pp.93-102
• /
• 1979

Chemical compositions of Flue - cured and Burley tobacco leaf and smoke were analyzed to find out simple correlation between compositions. Based on the simple correlation ( $r$ ) data, four regression equations were obtained for dry condensate and nicotine in smoke as follows, $Y_{FT}=\;0.816+4.638X_1+0.346X_2$......................................(1) $Y_{BT}=\;0.235+0.884X_3-0.088X_4$......................................(2) $Y_{FN}=\;0.015+0.090X_5+0.476X_1$......................................(3) $Y_{BN}=-0.026+0.101X_3-0.006X_4$.........................................(4) where, $Y_{FT}$ : dry condensate (mg/cig.) in cigarette smoke of Flue-cured $Y_{BT}$ : dry condensate (mg /cig. ) in cigarette smoke of Burley $Y_{FN}$ : nicotine contents (mg/cig.)in cigarette smoke of Flue-cured $Y_{BN}$ : nicotine contorts (mg/cig. ) in cigarette smoke of Burley $X_1$ : total alkaloid contents (%) of Flue-cured $X_2$ : curde ash contents (%)of Flue -cured $X_3$ : alcohol -benzene extract contents (%) of Burley $X_4$ : curde ash contents (%) of Burley $X_5$ : hexane extract content (%) of Flue -cured Standard deviation for regressions equations were obtained respectively. equation(1),$\pm$3.16 : equation (2),$\pm$1.94 : equation (3),$\pm$0.35 , equation (4) $\pm$ 0.33. Regression equations between dry condensate and nicotine contorts in cigarette smoke were also obtained in the forms of equation(5) and(6) $Y_{FN}$= 0.274 $Y_{FT}$- 3.259............................(5) $Y_{BN}$= 0.249 $Y_{BT}$ - 2.093.............................(6) Standard deviations, $\pm$ 0.061 and $\pm$ 0.152, were obtained for regression equation(5) and (6) respectively.

• Journal of the Korean Society of Tobacco Science
• /
• v.5 no.2
• /
• pp.71-75
• /
• 1983

The relative proportion of the major smoke components in the nonvolatile phase from some varieties of tobacco, 1. e. flue- cured, burley, and aromatic tobacco, were determined. In flue- cured tobacco smoke, hydroquinone and glycerol we re exhibited higher concentrations than in the smoke from the other tobaccos. In aromatic tobacco smoke, the contents of non-volatile phase were present in lower concentrations.

• Journal of the Korean Society of Tobacco Science
• /
• v.9 no.1
• /
• pp.35-43
• /
• 1987

This survey was been conducted to classify the distribution of morphological and chemical characteristics of soils in the major districts cultivating flue-cured tobacco plant. The results obtained are summarized as follows; 1. Tobacco was mainly grown in local valley, 7-15% slopes, loam and sandyloam containing gravels, and productivity classes of soil were corresponded to 3-4 degree for upland crops. 2. most soils were acidic (below pH 5.5) and contained low organic matters. (below 2%) 3. Dominant soil series were SANGJU, JIGOG, SEOCTO, SAMGAG ANRYONG, SUAM, and YESAN.

• Journal of the Korean Society of Tobacco Science
• /
• v.5 no.1
• /
• pp.87-95
• /
• 1983

This study was conducted to evaluate the affect of soil conditioners and their application rates on the growth, Yield and quality of Flue-cured tobacco. Soil conditioners for this study were Montmorillonite arid Zeolite as clay mineral source and Rice hull and Sawdust as organic source. Their application rates were 500, 1000, 2000kg/10a. The growth of tobacco plants was promoted, compared with that of Non- treated plot (control) by Zeolite, Montmorillonite and Rice hull application but decreased by Sawdust application. During tobacco growing season soil moisture content, compared with control, was increased by Zeolite and Montmorillonite application but decreased by Rice hull and Sawdust application. In contrast to soil moisture content, soil temperature was higher in the Rice hull and Sawdust plot than in the plot of Zeolite and Montmorillonite. The treatment of Sawdust, compared with control, obviously accelerated the maturity of tobacco, increased reducing Sugar but decreased total alkaloids, nicotine and nitrogen content of cured leaves. The Sawdust Plot decreased the Yield (kg/10a) with significant difference by 1 %level but significantly increased leaf quality (Won/kg) and value (Won/10a) by 1%and 5 %level, respectively. The present application , ate of Nitrogen in Korea (12.5kg/10a) seems to be excessive for Flue-cured tobacco production.

• Journal of the Korean Society of Tobacco Science
• /
• v.24 no.1
• /
• pp.13-20
• /
• 2002

This study was conducted to evaluate the prediction of sensory attributes of tobacco smoke by the use of volatile oil components of tobacco. For analytical and sensory evaluations, twelve aging tobaccos (i.e., 3 crop years; 1998, 1999, 2000, and 4 stalk positions) were prepared in flue-cured and burley tobaccos. 61 volatile oil components and 5 sensory attributes such as irritation, impact, after taste, bitter and green were investigated. Irritation of flue-cured tobacco, and irritation and impact of burley tobacco were significantly increased with the ascending stalk position, whereas after taste of burley tobacco was significantly decreased. Significantly positive correlations among irritation, impact, and bitter were observed in flue-cured tobacco. A significantly positive correlation between irritation and bitter was observed, significantly negative correlations between after taste and irritation and between after taste and impact were observed in burley tobacco. Except for green of burley tobacco, all probabilities of multiple linear regression equations between volatile oil components of tobacco and sensory attributes of tobacco smoke were significant(P$\leq$0.05). This study suggests that the multiple linear regression equations may be useful to predict the sensory attributes of tobacco smoke with a few selected volatile oil components of tobacco.

• Journal of the Korean Society of Tobacco Science
• /
• v.20 no.1
• /
• pp.19-25
• /
• 1998

The bulk curing experiment to the improve the quality of flue-cured leaves were carried out to evaluate relationship between cyclic curing and conventional curing method. We studied the effect of the cyclic change of wet bulb temperature at the yellowing stage of flue curing on chemical properties of cured leaves. The wet bulb temperature was automatically controlled between preset high($38^{\circ}C$) and low point ($35^{\circ}C$) everyone hour cyclically during 12 hours after starting luring. As a result, the acceleration of the increase in the chemical properties of cured leaves were observed. As to the chemical properties, there was decreased in citric acid, increased in malic acid of the nonvolatile organic acids and all higher fatty acids content of leaves cured by this method compared with in that of conventional curing method, while a major chemical compounds in relation to aromatic essence of cigarette smoke in essential oil components of lured leaves was mostly higher in this method than those of conventional ones, and it was evaluated that there was decreased in CO, TPM, Tar, and $CO_2$ content of the cigarette smoke comparing to the conventional luring method.

• Journal of the Korean Society of Tobacco Science
• /
• v.19 no.1
• /
• pp.57-63
• /
• 1997

The composition of leaf surface lipid in Flue-cured tobacco and their changes during curing was investigated. The flue-cured variety, Nicotiana tabacum cv. NC 82 was cultivated at Eumsung experiment station in 1996. The samples of riced leaves with different stalk Position(Lugs, Cutter, Leaf and Tips) and different curing stage at half yellowing(24hr), yellowing(48 hr) , color axing(72 hr), midrib drying(96 hr) and cured(120 hr) were collected for analysis of leaf surface lipid. $\alpha$ - and $\beta$ - 4, 8, 13-Duvatriene-1, 3-diol($\alpha$, $\beta$-DVT) were major components in leaf surface lipid extracted with methylene chloride and sugar ester was detected slightly DVT content was increased with ascending stalk position, but increasing trend of total hydrocarbon was not observed. While DVT was decreased throughout curing of tobacco leaves, hydrocarbon content did not show significant change during curing process. Twenty-two duvane compounds were detected by capillary GC in duvane fraction isolated from leaf surface lipid and of which 11 compounds were identified by GC-MS. These compounds were decreased with curing in all stalk position.

• Journal of the Korean Society of Tobacco Science
• /
• v.23 no.1
• /
• pp.12-18
• /
• 2001

This study was conducted to investigate the effect of tobacco curing on far infrared light on the quality of flue-cured tobacco leaves. Physicochemical characteristics such as alkaloid, total sugar, total nitrogen, starch, total phenolic compounds, browning degrees, and color differences, in cured tobacco leaves were compared between hot air and far infrared curing methods. There was no significant difference in sugar/nicotine ratio and nitrogen number between the curing methods, while the contents of ether extract and filling capacity were increase by far infrared curing. Therefore, it was expected that far infrared curing might be effective for high aroma and physical properties of the cured tobacco leaves.

• Journal of the Korean Society of Tobacco Science
• /
• v.13 no.2
• /
• pp.20-26
• /
• 1991

This study was carried out to develop the method of alkaloids analysis and investigate the kinds and contents of alkaloids in flue-cured, burley and oriental tobacco leaves using developed analytical method. The developed analytical method of alkaloids was as followed : Tobacco sample was treated with acid(pH 2∼3) and extracted with chloroform to remove chemical components except alkaloids. Sample solution was treated with alkali(pH 12∼ 13) and was extracted with chloroform to obtain alkaloids from sample solution. After extraction of alkaloids from tobacco leaves, alkaloids were separated and identified by GC, GC/MS using SE-54 fused silica capillary column. Nicotine, nornicotine, myosmine, 9-nicotyline, anabasine, anatabine, 2, 3-bipyridyl, cotinine, formyl nornicotine, acetyl nornicotine and formal anatabine were isolated and identified from the extracts of tobacco leaves. The contents of alkaloids were burley > flue-cured > oriental tobacco leaves, but oriental tobacco leaves were higher nornicotine, cotinine, formyl nornicotine and acetyl nornicotine contents than those of flue-cured tobacco leaves. The burley tobacco harvested in Korea was higher nornicotine contents by 2-6 times in the portions of cutter, leaf and tips position than that of burley tobacco(B3F) harvested in V. S. A.