• 한국연초학회지
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• 제8권1호
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• pp.41-48
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• 1986

This experiment was carries out to study on the effect of temperature raising rate to chemical composition of tobacco leaves during the midrib drying stage of flue-curing. The results were as follows : In the case of the temperature raising rate became more rapidly during midrib drying stage. It had a tendency to increase in oxailic acid, succinlc acid, ammonia, polyphenol; there was a large loss of total sugar, reducing sugar, malic acid, palmitic acid and linolenic acid; leaf color became more reddish; the leaf quality index value decreased, thereby the quality of external appearance deteriorated. It is desirable that the temperature raising rate had to be more slowly.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1988년도 춘계 학술대회지
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• pp.90-91
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• 1988

• 한국작물학회지
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• 제33권s01호
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• pp.115-123
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• 1988

Ginseng has been used as a medicinal herb in the world for more than two thousand years. Inspection of the quality of ginseng was made since many hundred years ago. Ginseng quality has been graded by several methodes, based on saponin contents, number of ginsenosides, shape of root and tissue elaborateness. In present. ginseng products are usually evaluated by saponin contents and number of ginsenosides. On the other hand, fresh and manufactured ginseng roots such as red. white and semi-red ginseng, Taegeuk Sam, are mostly graded by root shape such as root development and skin (epidermis) color, and tissue elaborateness. which is a conventional grading method. However, the root shape grading method has a risk of overlooking real medicinal properties of ginseng. So. both the medicinal ingredients and the conventional grading method should be considered for the proper evaluation of ginseng quality. Therefore, for the establishment of better method in evaluating ginseng quality, the relationships of root shape and useful components are required to be studied.

• Membrane and Water Treatment
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• 제5권1호
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• pp.31-40
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• 2014

Papermaking tobacco sheet is an important reclaimed process for cigarette making. Traditionally, the pressure driven membrane was often used to isolate the effective compounds from the tobacco sheet extract. However, this method is difficult to remove small ionic compounds. Besides, membrane fouling is a major problem for effective use of these pressure driven membrane technologies. In this study, the electrodialysis process is used to removal the chloride ions and nitrate ions, thus the smoking quality of papermaking tobacco sheet extract can get improved. Three types of electrolytes ($Na_2SO_4$, NaCl and HCl) are chosen to prevent the generation of precipitation. The results indicate that 0.1mol/L HCl at current density of $30mA/cm^2$ is the optimal condition for the electrodialysis process. The removal rates of the Cland $NO{_3}^-$ in tobacco sheet extract are 97% and 98.4%, respectively. The electrodialysis process cost was estimated to be 0.11$/L. Naturally, electrodialysis is not only technological feasible, environmental-friendly and economical-attractive for tobacco extract treatment.

• 한국연초학회지
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• 제2권1호
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• pp.68-77
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• 1980

土壤中 有效燐酸 含量이 相異한 圃地(350, 140, 35ppm)에 燐酸質 肥料를 0, 5, 10, 15, 20, 30kg/10a로 各各 處理하였을 때 담배의 生育과 品質에 미치는 효과를 調査하였다. 담배의 生育은 生育後期에 下位地(35ppm)만 燐酸質 肥料 增施 效果가 認定되었으며 乾物重은 담배 生育과 同一한 傾向이었다. 담배의 成熟과 葉中 化學成分은 燐酸質 肥料에 影響을 받지 않았다. 乾葉의 品質은 土壤中 有效燐酸 含量에 關係없이 비슷하였으며 收量은 下位地에서만 燐酸質 肥料의 增施效果가 認定되어 10kg/10a 施肥면 충분한 生産量을 期待할 수 있는 것으로 나타났다.

• 한국연초학회지
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• 제16권1호
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• pp.26-33
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• 1994

A tobacco ripeness grading meter was designed and constructed using the color sensor, its performance was evaluated. A degree of ripeness grading of a leaf is very closely related to the measured tobacco leaf color. Measuring the small amount of the reflectance precisely depends on the apparatus including color sensor, light source, detector sensitivity, and geometric characteristics of appratus. To analyze and minimize the variational effects, experiments to select the proper condition were performed. Because of the combined effect mentioned above, the system has some variation on its response. Basis on the results of the experiments, prototype was developed and interfaced to a computer system. The main components of prototype included a tungsten lamp as a light source, Amorphous full color sensor with three filters, regulated D.C. power supply, OP - AMP(741 TC) for amplification, AR - B3001 board for interfacing to a computer with analog to digital conversion, and a compatible IBM PC XT computer. The experimental results of the developed ripeness tobacco leaf measurement system are summarized as following: [1] The output readings of ripeness grade meter for tobacco leaf, which is based on harvesting time, showed the apparent difference in variety of different quality. It was considered suitable that three filters(red, green, blue) in Amorphous full color sensor could be used in four different ripeness degree measurement of tobacco leaf. [2] The output readings of ripeness grade meter for tobacco leaf, which is based on government procurement, showed apparent difference in variety of different quality. Tobacco leaf varieties to stalk position are divided into tips, leaf, cutters, and primings, It is considered suitable that only red filter in the sensor could be used to classify the grade of tobacco leaf within the same kind tobacco stalk. However, the ripeness grade meter was not adequate to classify all the tobacco grades in the four different tobacco leaves.

• Applied Biological Chemistry
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• 제37권5호
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• pp.349-355
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• 1994

비파괴 측정법의 하나인 근적외 분광분석법을 응용하여 국내산 황색종 잎담배의 품질에 관련된 주요성분인 수분, 니코틴, 전질소, 환원당 및 색깔 등을 신속, 정확하게 동시에 측정하기 위한 가능성을 조사하였다. 근적외 영역의 광학데이타와 기존 습식분석법에 의한 잎담배의 수분, 니코틴, 전질소, 환원당 및 L, a, b 측정치 간에 중회귀 분석을 행한 결과, 검정용 시료에 대한 측정오차(SEP)가 각각 0.28%, 0.25%, 0.07%, 1.25, 0.44 및 1.07이며, 시료의 전처리없이 30초 이내에 동시에 측정 가능함을 알 수 있었다. 아울러 잎담배 수매, 원료가공 및 제품담배 제조현장에 활용하기 위한 보급형 근적외 분광분석기의 개발 가능성도 검토하였다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 1988년도 춘계 학술대회지
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• pp.92-93
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• 1988

• 한국연초학회지
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• 제7권2호
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• pp.129-139
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• 1985

cent was carried out to study on the effect of temperature and humidity to chemical tobacco leaves during the yellowing stage. The results were follows : In the condition of high humidity and low temperature, yellowing time was delayed ; leaf color appeared lack clearness. In the higher temperature and the lower humidity during the yellowing stage : total sugar, reducing sugar and malic acid content were increased. Decomposition of nitrogenous components elevated in $38^{\circ}C$, 85%RH. Changes of total nitrogen content correlated with total curing time. Adecrease of linolenic acid with a corresponding increase of chlorogenic acid proceeded in the condition of low temperature and high humidity. In a view of tobacco quality by chemical components, the low temperature and high humidity during the yellowing stage decreased quality of tobacco leaves. It is considered to control of the proper condition of temperature and humidity during the yellowing.

• 한국연초학회지
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• 제14권2호
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• pp.159-167
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• 1992

It would be clear that the constituents of the leaf surface lipid is ye비 important as an evaluation index of tobacco leaf quality since the quality of tobacco specific aroma with leaf species depends on the contents of the lipid and the strength of the aroma is determined by the amounts of the lipid secreted. For the reason, a rapid and peproducible method to quantify DVT, which is a kind of lipid, has been studied. The biosynthesis procedure of DVT in leaf growing processes, and the volatile or decompositional characters of DVT in leaf drying processes were also discussed. In consequence, it might be possible to get the data available to the cultivation of better tobacco leaf and the manufacture of cigarettes with better aroma and taste. The results obtained from this study are as follows. 1. Chloroform/dichloromethane solvent was better than chloroform alone for DVT extraction. The extraction yields of the leaf surface lipid were about 5% 2. The extractives with dichloromethane were treated by silylation with BSTPa and the quantitative analysis of DVT was carried out using SE -54 fused silica capillary column. It was found that rapid and reproducible data could be obtained from these methods. 3. In flue - cured tobacco species, DVT contents were $30.3\mu\textrm{g}/cm^2$ in the beginning stage of leaf drying processes and $12.1\mu\textrm{g}/cm^2$ corresponded to 30% levels of the beginning stage, in the end stage. 4. DVT contents in Burley mere 2 times as large as those in fluecured tobacco. DVT in the upper stalk position of leaf was 3 times larger than that in the lower stalk position. 5. DVT of tobacco leaves was decomposed by $SO_2$ gas or the sun light. The decomposition rate was largest in the sample used methanol as a extraction solvent.