• Toxicological Research
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• 제13권4호
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• pp.409-415
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• 1997

The influences of dietary supplement of citron tea on the hepatocellular chemical carcinogenesis have been studied by examining placental glutathione S-transferase(GST-P) positive foci area in a liver tissue, contents of total cytochrome P450, thiobarbituric acid reactive substances(TBARS) and glucose 6-phosphatase(G6Pase) in hepatic microsome and glutathione S-transferase(GST) activity. Weaning Sprague-Dawley male rats were fed AIN76 diet with or without citron tea supplement. Rats of CTR and CTR+ groups were fed diet without citron tea supplement while CDI and CDI+ groups were fed diet with citron tea supplement for the entire experimental period(13 weeks). Rats of CDP and CDP+ groups were fed diet without citron tea supplement for the first 7 weeks and swiched to citron tea containing diet for the last 6 weeks of experimental period. CTR+, CDI+ and CDP+ groups were carcinogen treated group. Diethylnitrosamine(DEN) was used as a carcinogen initiator and injected to the rats of carcinogen treated groups as a single dose of 200 mg/kg body weight intraperitoneally after 4 weeks of feeding. 2-Acethylaminofiuorene(AAF) was used as a carcinogen promoter and supplied in the diets of carcinogen treated rats as 0.02% content for the last 6 weeks starting from 2 weeks after DEN injection. Rats were sacrificed after 13 weeks of feeding. Liver/body weight ratio and GST activities were increased by carcinogen treatment. However, they were not changed by citron tea supplement. Total cytochrome P450 contents were not changed by carcinogen treatment or citron tea supplement. TBARS contents of carcinogen treated rats showed tendency to decrease by citron tea supplement. G6Pase activity decreased by carcinogen treatment and citron tea supplement. The area of GST-P positive foci detected in carcinogen treated rats were decreased by citron tea supplement and not affected by the timing and the duration of citron tea supplement. These results suggest that citron tea has suppressive effects on hepatocellular chemical carcinogenesis probably through antioxidant compounds by decreasing TBARS contents.

• 한국식품영양과학회지
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• 제40권8호
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• pp.1073-1078
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• 2011

위생적으로 안전성이 확보된 후발효차를 제조하기 위해 Bacillus subtilis, Saccharomyces cerevisiae 및 Lactobacillus bulgaricus를 이용하여 후발효차를 제조한 후 발효시간에 따른 항산화 성분 및 활성의 변화를 측정하였다. 후발효차의 ascorbic acid의 함량은 발효기간 내내 균종에 관계없이 녹차(66.74 mg%)에 비하여 비교적 낮은 함량(43.62~62.84 mg%)을 보였고 산소와의 접촉을 최소화한 L. bulgaricus 균에 의한 발효가 비교적 적은 변화를 보였다. Polyphenol 화합물의 함량은 녹차의 경우 14.88%였으며 후발효차는 11.54~14.12%로 세 균주 모두 발효가 진행됨에 따라 함량이 다소 감소하였다. 실험에 사용한 녹차의 flavonoid 함량은 7.78 mg%였으며 미생물을 이용한 후발효차의 경우에는 4.33~7.88 mg%로 대부분 녹차에서의 함량보다 적은 것으로 나타났다. 항산화 활성의 경우, 녹차의 DPPH 전자공여능 및 ABTS 항산화 활성은 각각 87.47% 및 203.22 AEAC mg%였으나 발효기간에 따른 후발효차에서는 녹차에 비하여는 낮은 활성을 보여 후발효차 제조 시 어느 정도 항산화 성분의 함량 및 활성이 다소 감소하게 되지만 미생물을 이용하여 후발효차를 제조 시 위생적이고 기호도가 우수한 제품을 생산할 수 있는 것으로 판단되었다.

• 한국식품영양학회지
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• 제27권3호
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• pp.421-426
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• 2014

The objective of this study is to propose an export strategy due to an analysis of USA and Japan consumer's perception and willingness-to-pay for flower tea. For that, we conducted a survey on the consumer's perception on flower tea compared with leaf tea such as green tea. We also analyzed the willingness to purchase and pay for it. The reasons of drinking of flower tea for USA consumer are 'flavor'-followed by 'taste', and for Japanese consumer 'relaxation'-followed by 'flavor' in order. Both of them consider 'quality', 'safety'- and 'origin' in order when they purchase flower tea. USA consumers have a willingness-to-pay of about 8.3% and Japanese consumers have a willingness-to-pay of about 29.1%. Based on those results, it is necessary to differentiate the process and marketing strategies for the export of flower tea.

• Bulletin of the Korean Chemical Society
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• 제26권5호
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• pp.747-754
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• 2005

Liquid chromatographic methods with UV and fluorescence detection have been used to determine the levels of (+)-catechin, (-)-epicatechin, (-)-epicatechin gallate, and (-)-epigallocatechin gallate in Korean green tea infusions. The extracts of Korean green tea leaves or powders in water at various temperatures (100 ${^{\circ}C}$, 80 ${^{\circ}C}$, 60 ${^{\circ}C}$) and time, were washed with chloroform and re-extracted to ethyl acetate. The ethyl acetate phase was dried and re-dissolved in methanol and analyzed. Five catechin compounds were separated by gradient elution. The flavonoids were found decomposed on prolonged extraction, thus exhaustive extraction by a Soxhlet apparatus was found useless for green tea. Some unknown components were found in the extracts at 100 ${^{\circ}C}$. When the green tea was filtered and re-extracted with new fresh water, still some flavonoids were extracted. However, the contents of flavonoids in the third extract were found negligible. The flavonoid extraction rate of green tea powders was higher than that of green tea leaves, but flavonoid decomposition of green tea powders was also faster than that of green tea leaves. The traditional way of drinking green tea was found appropriate in view of flavonoids intake.

• 한국작물학회지
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• 제40권6호
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• pp.775-781
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• 1995

국산녹차에 있어서 보건적 효능과 관련된 특수성분의 유엽시기 및 제다법에 따른 변화를 조사한 결과는 다음과 같다. 수용성 펙틴은 후기유엽기에 점차적으로 증가를 보였으며 평균함량은 봉산리 녹차가 2.05% 부춘리 녹차가 1.84%이었다. 생엽에 대한 제다엽의 변화는 증다법 22.8%, 부초법 17.9% 증가하였다. 총엽록소는 후기유엽기로 갈수록 증가하여 1번 유엽기에서 5번 유엽기까지 봉산리는 233mg%에서 334mg%로, 부춘리는 198mg%에서 4번유엽기 까지 331mg%로 증가하였으나 5번 유엽기에 다소 감소를 보였다. 평균함량은 봉산리 평균 293mg%, 부춘리 평균 275mg%이었으며, 엽록소 a : 엽록소 b는 봉산리 평균 70.0:30.0, 부춘리 평균 67.3:32.7이었고 제다법에 따라 엽록소 a와 엽록소 b의 감소 정도에 차이가 있었다. 총 아미노산 함량은 봉산리 2,156mg%, 부춘리 평균 1,723mg%로 갈수록 큰 폭으로 감소를 보였다. 카페인은 후기유엽기에서 다소 적은 함량을 보였으나 부춘리는 3번 유엽기에 2.86%까지 증가를 보이다 감소하였다. 평균 카페인함량은 봉산리가 2.033%, 부춘리가 2.620%이었다. 카테친류는 후기유엽기로 갈수록 증가를 보였으나 봉산리의 경우 4번 유엽기 이후 급격히 감소하였다. 평균 카테친함량은 봉산리가 11.52%, 부춘리가 14.05%이었으며 유리형의 카테친은 봉산리 평균 35.59%, 부춘리 평균 42.73%, easter형 카테친은 봉산리 평균 58.09%, 부춘리 평균 44.47%이었다. 카테친류 및 카페인의 식용시 용출량은 침출온도가 $65^{\circ}C$에서 85$^{\circ}C$로 높을수록, 침출시간이 3분에서 9분으로 길수록 증가하였으며, 85$^{\circ}C$, 9분 침출시 카테친류는 89.3%, 카페인은 97.3%가 용출되었다.

• Applied Biological Chemistry
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• 제31권3호
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• pp.284-291
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• 1988

국내외산 녹차 15종에 대한 이화학적 특성과 기호도를 조사하고 이들 사이의 상관관계를 구명하여 녹차의 품질영향인자를 검토하였다. 녹차의 이화학적 특성치중 탄닌, 카페인, 유리아미노함량산은 국산녹차가 외국산 녹차보다 높은 경향이었으나 클로로필함량은 일본산 녹차가 가장 높았다. 침출액의 색깔에 대한 기호도는 일본산 녹차가 가장 우수하였고 맛에 대한 기호도는 국산 볶은차가 가장 우수하였다. 이화학적 분석치와 관능평점과의 관계를 중회귀분석한 결과, 녹차의 종합적 품질에 영향을 미치는 인자는 녹차중의 카페인, 클로로필 b, 총유리아미노산함량 및 침출액의 L값 이었으며 이들 특성치에 의하여 산출한 회귀방정식은 녹차의 기호도를 89%의 신뢰도를 가지고 설명할 수 있었다.

• 한국식품영양학회지
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• 제30권5호
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• pp.908-915
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• 2017

This study was performed to determine the effects of different processing methods (AD: drying at $50^{\circ}C$ for 15 h; ADR: roasting after drying; SAD: drying after steaming; SADR: roasting after steaming and drying) on the quality characteristics, total phenolic content, anthocyanin content, DPPH radical scavenging activity, and reducing powder of red radish (Bordeaux and watermelon radish) tea. The pH of red radish tea was the highest with SAD. In terms of the total sugar content, Bordeaux radish tea showed the highest level with AD, ADR, and SAD, and watermelon radish tea showed the highest level with SADR. The a value of Bordeaux radish tea was higher with AD and ADR. The b value of Bordeaux radish tea was increased with steaming and roasting treatment. In terms of measuring the colors of watermelon radish tea, the L value was decreased while the b value was increased with roasting treatment. The total phenolic content, DPPH radical scavenging activity, and reducing powder with ADR and SADR were higher than those in samples prepared by different processing methods. AD and SAD resulted in higher anthocyanin contents than ADR and SADR. In terms of sensory evaluation, the appearance and color were rated higher with AD and SAD, whereas the flavor and taste were ranked higher with ADR and SADR than in the other samples. The results suggest that red radish (Bordeaux and watermelon radish) tea prepared by ADR and SADR processing methods can be utilized as health functional tea material with antioxidant activity.

• 동아시아식생활학회지
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• 제14권2호
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• pp.156-160
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• 2004

This study was carried out to examine the changes of chlorophyll a and b contents by the extraction temperatures and the number of soaking using five kinds of Korean green teas(3 kinds of green tea and 2 kinds of tea bag) which were obtained from a local market in Daegu city, Korea. The chlorophylls were extracted with 80% acetone, and determined by a visible spectrophotometer. The concentration of chlorophyll in Sulrok(tea bag) were the highest among all kinds of teas when they were extracted at 60, and decreased with the number of soaking increased. On the other hand, the chlorophyll content of green teas was the highest at 80, and decreased with the increase of the number of soaking as the tea bag did. It was found that the Korean tea bag contained more chlorophyll than green teas did, and green teas contained significantly more chlorophyll b than chlorophyll a.

• The Plant Pathology Journal
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• 제17권1호
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• pp.40-44
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• 2001

Disease occurrence and development of gray blight of tea (Camellia sinensis) were investigated. Higher incidences and more severe damage by gray blight were found in Japanese tea variety Yabukita than the Korean local variety. In Yabukita, Pestalotiopsis longiseta was more frequently observed on the diseased leaves than P. theae but vice versa in the Korean local variety. This indicates that there was the varietal difference in the distribution of fungal species of gray blight pathogens. Both varieties were most severely damaged during the third harvest period with weather conditions of high temperature and humidity favorable to the disease. Presence of the tea brown blight fungus Glomerella cingulata on the margin of gray blight lesion at the late stahe suggested that the pathogenic fungi of tea gray blight were replaced by the brown blight fungus during the disease development.

• 마케팅과학연구
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• 제8권
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• pp.21-38
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• 2001

본 연구에서는 전통차의 의미를 인식하면서 차문화를 확산시킬 한 방법으로 전통차의 관광상품화 방안이라는 연구의 주제를 선정하였다. 즉 우리의 전통차의 관광상품화를 위해서는 전통차가 지니고 있는 기본적 성질 못지 않게 전통차에 대한 인식제고가 필요함을 제시하고 있다. 결론적으로 전통차의 관광상품화와 병행하여 전통 다례, 학습기회 제공을 위한 다양한 프로그램 개발도 있어야 할 것이다.