• 한국식품영양학회지
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• 제32권5호
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• pp.401-407
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• 2019

This study compares and analyzes inorganic components of four different Pu-erh tea species consumed in Korea. The criteria for the inorganic components was based on the Royal Institute of Technology (KTH) recommendations. Out of the 19 general items: potassium, manganese, silicon and fluorine were detected in amounts exceeding the maximum allowable concentration by 5~23, 57~91, 1.6~1.8 and 9~18 times respectively. Out of the 15 potentially harmful elements: aluminum and nickel were exceeded the Maximum allowable concentration by 9~14 times and 0.8~1.2 times respectively. To reduce the concentration of inorganic elements in excess of the maximum allowable concentration, the extraction time of tea should be less than 1 minute in addition to limiting the amount. The amount of Pu-erh tea for extraction was about 0.1 g manganese, about 0.3 g potassium, about 0.5 g fluoride and about 2 g silicon. Therefore, the maximum amount of tea for extraction should be 0.1 g in regards to the safety of Pu-erh tea. Based on the recommended maximum daily intake of inorganic ingredients by the Ministry of Food and Drug Safety, it is desirable that the number of extractions be less than three.

• 한국유기농업학회지
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• 제19권spc호
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• pp.21-24
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• 2011

• 미생물학회지
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• 제53권3호
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• pp.170-179
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• 2017

차는 세계적으로 인기있는 음료로 불발효차(녹차), 반발효차(우롱차), 완전발효차(홍차)와 흑차(미생물발효차 or 후발효차)를 포함하고 구분된다. 미생물발효차는 차나무(Camellia sinensis)의 잎을 미생물 발효과정을 통해 제조된다. 삼국시대부터 전해 내려온 청태전은 한국 남해안지역에서 제조되며 돈차 또는 떡차로 불리는 독창적인 한국의 미생물발효차이다. 본 연구에서는 청태전에 우점하는 미생물군집구조 분석을 위해 16S rRNA 유전자를 이용하였다. 청태전에 우점하는 미생물은 ${\gamma}$-proteobacteria에 속하는 Pantoea sp.와 Klebsiella oxytoca가 우점하였다. 미생물 군집크기 분석을 통해 청태전의 미생물 군집크기가 다른 미생물발효차와 비교해 가장 큰 것을 확인하였다.

• Journal of Nutrition and Health
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• 제32권4호
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• pp.337-352
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• 1999

The effects of dried leaf powders and ethanol extract of persimmon, green tea and pine needle on lipid metabolism, lipid peroxidation and antioxidative activity were investigated in rats. Forty-nine male Spargue-Dawley rats weighing 107.8$\pm$1.8g were blocked into seven groups according to body weight. Rats were raised for four weeks with diets containing either 5%(w/w) dried leaf powders of one of three different Korea traditional teas, persimmon(Diospyros kaki Thunb), green tea(Camellia Sinensis O.Ktzc)or pine needle(pinus Koreansis Sieb. Et Zucc), or ethanol from equal amounts of each dried tea powder. Food intake, weight gain, food efficiency ratio, and weights of liver, kidney and epididymal fat were significantly higher in the green-tea-powder group, and significantly lower in the pine-needle-powder and pine-needle-extract groups. Persimmon-leaf powder was found to decrease plasma total lipid, triglyceride and cholesterol concentration by increasing fecal total lipid triglyceride and cholesterol excretions. Liver cholesterol concentration was significantly lower in the green-tea and pine-needle-extract groups. Red-blood-cell superoxide dismutase(SOD) and glutathione peroxidase(GSH-px) activities were significantly increased in rats fed green-tea extract. Liver SOD activity was increased in rats fed pine-needle powder or extract, and liver GSH-px activity was increased in rats fed greentea powder. Plasma and liver thiobarbituric acid reactive substance(TBARS) concentration were both decreased in rats fed dried leaf posers or extracts of persimmon or green tea. It is believed that high vitamin E levels in persimmon leaf, and high flavonoid, beta-carotene and vitamin C levels in green tea effectively inhibited lipid peroxidation. In conclusion, persimmon and green tea leaves were effective in lowering lipid levels and inhibiting lipid peroxidation in animal tissue, while pine needles were effective and lowering body weight gain. From these results, persimmon and green tea leaves can be recommended in the treatment and prevention of chronic discorders such as cardiovascular disease, cancer and aging. As ethanol extracts from these teas were also effecitive in lowering tissue lipid levels and inhibiting lipid peroxidation, we recommend the use of discarded tea grounds for this.

• 한국전통조경학회지
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• 제30권1호
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• pp.39-45
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• 2012

본 연구는 조선시대의 다화들을 살펴 그림 속의 다양한 장면들을 통해서 음다공간의 독특한 경관성을 살피는 데 목적을 두고 있다. 특히 조선시대에 그려진 다화들은 다수 있으며, 그림을 그린 화가들도 대부분 알려져 있어 음다공간에 대한 당시 선비들의 취향과 자연성 및 장소성 등과 같은 경관요소를 알 수 있다. 한국에 차가 도입된 것은 삼국시대로 매우 오래된 역사를 갖고 있다. 지금까지 차에 관한 연구는 다양하게 전개되고, 연구결과도 많이 발표되었지만, 조경학적 관점에서 살펴본 연구는 미미한 수준이었다. 조선시대에 그려진 다화가 한국인의 차문화를 설명할 수 있는 하나의 문화적 코드라는 전제하에 다화에 나타난 다양한 장면들을 분석하여 한국인들이 형성하였던 음다공간이 가진 경관요소의 특징을 밝혔는데, 다음과 같은 결론을 얻을 수 있었다. 조선시대 다화에서 나타난 구성요소를 건축요소, 수요소, 석요소, 식물요소로 나누었으며, 첫째, 건축요소는 일본의 경우처럼 전용다실 특정한 건물이나 특별히 정해진 장소가 없이 어느 곳에서나 행해졌음을 확인할 수 있었다. 차와 연관된 건축물이나 정원이 없다는 것은 한국인이 가진 격식에 얽매이지 않고, 자연을 좋아하는 문화와 연관되는 것으로 볼 수 있다. 둘째, 수요소는 자연스러운 수경관을 연출하고 있었다. 셋째, 석요소는 완상이나 실용의 목적을 겸했음을 알 수 있었다. 넷째, 식물요소는 수목들이 기품 있는 형태미를 가지고 있으며, 수목들의 내재적인 상징성을 고려하여 식재하였음을 알 수 있다. 조선시대의 다화를 통해 한국 사람들은 차를 마시는데 있어서 일본과 달리 다도라는 어떤 특별한 격식을 따지지 않았으며, 한정된 공간을 정하지 않고 앉은 자리가 음다공간이었던 것으로 생각할 수 있었다.

• 한국식품조리과학회:학술대회논문집
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• 한국식품조리과학회 2004년도 학술대회
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• pp.85-85
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• 2004

• 한국독성학회:학술대회논문집
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• 한국독성학회 2003년도 추계학술대회
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• pp.94-94
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• 2003

Tea is the most popular beverage in the world, especially green tea (Camellia sinensis) is daily taken by Asian people including Japanese. In last two decades, a variety of biological effects of tea components such as antioxidative, antimutagenic, anticarcinogenic, antibacterial and radical scavenging activities on bacteria, cultured cells and mammals have been elucidated.(omitted)

• The Korean Journal of Physiology
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• 제30권2호
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• pp.249-256
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• 1996

The effect of probenecid on the transport of tetraethylammonium (TEA) was studied in renal cortical slices and isolated membrane vesicles to investigate the interaction of organic anion with the organic cation transport system in proximal tubule. Probenecid reversibly inhibited TEA uptake by renal cortical slices in a dose-dependent manner over the concentration range of 1 and 5 mM. The efflux of TEA was not affected by the presence of 3 mM probenecid. Kinetic analysis indicated that probenecid decreased Vmax without significant change in Km. Probenecid inhibited significantly tissue oxygen consumption at concentrations of 3 and 5 mM. However, probenecid did not significantly reduce TEA uptake in brush border and basolateral membrane vesicles prepared from renal cortex even at a concentration as high as 10 mM. These results indicate that probenecid reduces TEA uptake in cortical slices by inhibiting tissue metabolism rather than by an interaction with the organic ration transporter.

• 한국세라믹학회지
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• 제32권9호
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• pp.995-1002
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• 1995

The alumina fiber was obtained by extruding the TEA complexed polymeric sol, synthesized by the alkoxide sol-gel method, through nozzle. The purpose of this study was to investigate the properties of fiber spun by TEA complexed sol. The analysis of sol indicated that TEA was bonded at alkoxide precursor and the optimum molar ratio for spinning was 0.5 mole of TEA, 3 mole of H2O. The cross section of the fiber from circular nozzle was not circular but oval, which indicated that the shape of nozzle did not affect the shape of fiber. The diameter of the fiber was about 100 ${\mu}{\textrm}{m}$ in the state of dried gel fiber, 60${\mu}{\textrm}{m}$ in calcined fiber, and the tensile strength of the fiber calcined at 90$0^{\circ}C$ was 2.1$\times$108 Pa.

• 한국지역사회생활과학회지
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• 제19권3호
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• pp.365-371
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• 2008

This study was conducted to determine the potent physiological activity of traditional wild tea ("Don tea"; coin-shaped tea) as affected by different harvesting times, aging periods and extracting temperatures, No difference in anti-oxidative activities in the harvesting time and extracting temperature of tea leaves was observed. However, short aging periods of Don tea showed high ABTS {2-2-azonobis (3-ethylbenzothiazolin-6-sulphonic acid)} activity, ranging from 71.52 to 79.96%. DPPH (${\alpha},\;{\alpha}-diphenyl-{\beta}-picryl-hydrazyl$) radical scavenging activity of Don tea was 71.10 to 91.40%. Especially, longer aging period and an extracting temperature of $100^{\circ}C$ showed higher DPPH radical scavenging activity. With longer aging periods and an extraction at $90^{\circ}C$, nitrite radical scavenging activity of Don tea ranged from 74.04 to 94.92%. On the other hand, angiotensin 1-converting enzyme (ACE) inhibition activity of Don tea was 59.77-81.97%. It showed higher activity when harvested in June and August, aged for longer periods, and extracted at $100^{\circ}C$. These results suggested Korean traditional Don tea exhibited the highest physiological activity when aged over 8 months.