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황색종 잎담배의 후숙과정 중 유리당, 비휘발성 유기산 및 지방산의 변화
복진영,박윤신,박원종,이종률,Bock, Jin-Young,Park, Yoon-Shin,Park, Won-Jong,Lee, Joung-Ryoul 한국연초학회 2006 한국연초학회지 Vol.28 No.2
This study was carried out to investigate the changes of free sugars, non-volatile organic and fatty acids in flue-cured leaf tobacco during aging. The threshed leaf tobacco(B1O and C1L) produced in 2002 crop year was aged for 21 month in warehouse of Oc-Cheon Leaf Tobacco Processing Factory. The leaf tobacco were sampled at three month intervals for analysis of free sugars, non-volatile organic and fatty acids. The major free sugars of flue-cured were glucose and fructose regardless of tobacco grades. After aging period of 21 months, the contents of glucose and fructose showed a tendency to slightly decrease, and there was no appreciable change in the contents of sucrose in B1O and C1L grades. The major compound of non-volatile organic acid and fatty acid were malic, oxalic and citric, linolenic, linoleic and palmitic acid regardless of tobacco grade. After aging period of 21 months, the contents of malic, malonic, oxalic and fumaric acid showed a tendency to slightly decrease, whereas succinic acid was slightly increased, and maleic acid was not changed in B1O and C1L grades. The decreases in fatty acid contents in B1O and C1L grade tobacco loaves after 21 month aging were 16.5% and 9.8%, respectively. The decreases in linolenic acid contents in two grades were the highest, showing 22.1% and 12.0% reduction after 21 month aging.
복진영,박윤신,박원종,이종률,Bock, Jin-Young,Park, Yoon-Shin,Park, Won-Jong,Lee, Joung-Ryoul 한국연초학회 2006 한국연초학회지 Vol.28 No.2
This study was carried out to investigate the changes of essential oils in flue-cured leaf tobacco during aging for 21 months. The threshed leaf tobacco(BlO) produced in 2002 crop year was aged for 21 months in the warehouse of Oc-Cheon Leaf Tobacco Processing Factory. The leaf tobacco were sampled at three month intervals for analysis of volatile compounds. Volatile compounds were identified by GC/MS and comparison of gas chromatographic retention time with those of the authentic standard. The total of 75 compounds from the steam volatile concentrate of the flue-cured leaf tobacco were identified; they were 15 hydrocarbons, 12 alcohols, 3 aldehydes, 18 ketones, 7 esters, 10 acids, 3 phenols, 4 furans, 2 pyrrols and 1 pyridine. The major components of essential oil were neophytadiene, solanone, megastigmatrienone and phytol. After a aging period of 21 months, most of volatile compounds showed a gradual increasing tendency.
이승범(Seung-Bum Lee),이재동(Jae-Dong Lee),박윤신(Yoon-Shin Park) 대한환경위생공학회 2005 대한환경위생공학회지 Vol.20 No.4
Titania gel formations were prepared by sol-gel method using titanium(Ⅳ) chloride (TiCl₄), and its characteristics were analyzed by varying the epoxide/TiCl₄ ratio and the amount of water. In the end, titania (TiO₂) aerogel were prepared using supercritical drying process. VOCs such as benzene, toluene, and m-xylene (BTX) were oxidized using prepared titania aerogel and commercially available TiO₂, and its performance was compared. The surface area, pore volume, and average pore diameter of 1,2-epoxybutane are significantly smaller than the propylene oxide. And the titania aerogels with 6 mol of epoxides have high surface areas, pore volumes, and average pore diameters. As a result of photo-oxidation, conversion of benzene was reached about 70%, and other reactants were reached about 60% similarly. The conversion of BTX was increased as inlet concentration decreased. The reactivity of titania calcined at 600℃ was greater than 400 ℃ and 800 ℃. Water is required as a reactants for the oxidation of VOCs, and the continuous consumption of hydroxyl radicals required replenishments to maintain catalyst activity. The activity ratio increased with increasing reaction time when enough amount of water was present in the reactor.