• 한국식품조리과학회지
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• 제21권5호
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• pp.591-598
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• 2005

TThis study was designed to investigate the effect of puerh tea (Camellia sinensis LINNE) on the disposition of alcohol concentration and hangover symptoms in healthy college students. Subjects were assigned to 5 groups: empty control, normal control, puerh tea group (2%, 4%, 10%, wjv), G-P group (G company product), and B-P group (B company product). The puerh tea extract decreased the alcohol concentration in respiration, especially at the concentration of 4% (w/v). As a result of questionnaire analysis, a higher score was shown after drinking puerh tea extract than that of the usual state, but the difference had no statistical significance (P<0.05).

• 대한의생명과학회지
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• 제25권3호
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• pp.288-292
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• 2019

In vitro antimicrobial activities of hot water extracts of Camellia sinensis (L.) O. Kuntze, for carbapenem-resistant Enterobacteriaceae (CRE) were compared to commonly used conventional antimicrobial agents. CRE was not only resistant to imipenem, meropenem or ertapenem, but also to various antimicrobial agents, such as amikacin (> $128{\mu}g/mL$). The hot water extracts of Camellia sinensis (L.) O. Kuntze had the lowest MIC ($0.06{\sim}0.5{\mu}L/mL$) of the carbapenem-resistant E. coli, K. pneumoniae, and Enterobacter spp. tested, and it was possible more potent than various conventional antimicrobial agents. Synergistic combinations of the extract with used commonly antimicrobial agents might even improve its antimicrobial chemotherapy property.

• Parasites, Hosts and Diseases
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• 제51권5호
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• pp.537-544
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• 2013

The present study was performed to observe histopathological changes in tissues of Bithynia siamensis goniomphalos (Gastropoda, Bithyniidae) incubated in crude extract solutions of camellia (Camellia oleifera) seed and mangosteen (Garcinia mangostana) pericarp, and furthermore to estimate the molluscicidal effects of 2 plant substances. Substantial numbers of bithyniid snails were incubated in various concentrations of 2 plant solution for 24 hr. As the positive control, snails incubated in various concentrations of niclosamide, a chemical molluscicide, were used. The histopathological findings were observed in sectioned snail specimens of each experimental and control groups. The results showed that both camellia and mangosteen extracts had molluscicidal effects at 24 hr with 50% lethal concentration ($LC_{50}$) at concentrations of 0.003 and 0.002 g/ml, respectively, while niclosamide had $LC_{50}$ at concentrations 0.599 ppm. B. siamensis goniomphalos snail tissues (foot, gill, and digestive system) showed disruption of columnar muscle fibers of the foot, reduction of the length and number of gill cilia, numerous mucous vacuoles, and irregularly shaped of epithelial cells. Irregular apical and calciferous cells, dilatation of the digestive gland tubule, and large hemolymphatic spaces, and irregular apical surfaces, detachment of cilia, and enlargement of lysosomal vacuoles of epidermis were also shown in all groups. By the present study, it is confirmed that 2 plants, camellia and mangosteen, are keeping some substance having molluscicidal effects, and histopathological findings obtained in this study will provide some clues in further studies on their action mechanisms to use them as natural molluscicides.

• Journal of the Korean Wood Science and Technology
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• 제49권3호
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• pp.267-273
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• 2021

Camellia nut shell was collected, dried at room temperature and ground to get fine powder. The powder was extracted three times with 95% EtOH, combined, evaporated, and then freeze dried. The crude powder was dissolved in H₂O and then sequentially fractionated with n-hexane, CH₂Cl₂, EtOAc and n-BuOH. A part of EtOAc fraction was chromatographed on a silica gel and on a Sephadex LH-20 columns using MeOH, aqueous MeOH, EtOAc-n-hexane and EtOH-n-hexane to isolate gallotannins. Three gallotannins, 1,2-di-O-galloyl-β-D-glucopyranoside (2), 1,2,6-tri-O-galloyl-β-D-glucopyranoside (3) and 1,2,3,6-tetra-O-galloyl-β-D-glucopyranoside (4), including gallic acid (1), were isolated and elucidated by NMR and Mass spectroscopies. Although nothing new, these gallotannins were first reported from the nut shell extractives of camellia tree (Camellia oleifera C. Abel). This study was to investigate the chemical constituents, especially hydrolysable tannins, of nut shell extractives of Camellia oleifera and to provide basic information for the future chemical utilization of this species.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2007년도 추계학술발표회
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• pp.366.1-366.1
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• 2007

• 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)

• 한국약용작물학회지
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• 제19권4호
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• pp.276-286
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• 2011

Morus alba (Mulberry) leaves were exposed to fermentation for varying amounts of time: no fermentation (0 min, MANF), medial fermentation (10 h, MAMF), and full fermentation (24 h, MAFF). The chemical compositions of the teas were determined and compared with those of commercial Camellia sinensis teas. The results showed that mulberry leaf teas contained significantly higher amounts of ash and fat than Camellia sinensis tea. Compared with Camellia sinensis teas, all mulberry leaf teas contained significantly more total free amino acids (24.26~54.25mg L-glutamic acid equivalent $g^{-1}$), but the concentration of caffeine was relatively low for mulberry leaf teas. High thiamine, riboflavin, and niacin contents were found in all mulberry leaf teas, but ascorbic acid and pyridoxine were found at higher levels in Camellia sinensis teas than in mulberry leaf teas. Color measurements demonstrated that mulberry leaf tea infusions generally had lower $a^*$ (greenness) and $b^*$ (yellowness) values than Camellia sinensis tea infusions. All infusions exhibited low turbidity levels (less than 10%). The contents of total phenols were measured as 71.8 and 74.9mg 100 $ml^{-1}$ infusion in MANF and MAFF, respectively, but the MAMF tea infusion showed significantly lower total phenols (64.6mg 100$ml^{-1}$ infusion). The total flavonoid contents of mulberry leaf tea infusions were lower (8.9~20.6mg 100 $ml^{-1}$ infusion) than those of Camellia sinensis teas and thus had lower antioxidant capacities (DPPH: 326.8~526.9 ${\mu}M$ trolox equivalent $g^{-1}$ and FRAP: 364.6~387.6 ${\mu}M$ trolox equivalent $g^{-1}$) than Camellia sinensis teas. The amounts of ${\gamma}$-aminobutyric acid (GABA) and rutin were higher in fermented mulberry leaf teas; the level of GABA increased with increasing fermentation time and the content was highest in MAFF, but rutin content was highest in MAMF.

• 생명과학회지
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• 제15권5호
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• pp.767-771
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• 2005

본 연구는 1999년 5월부터 2003년 2월까지 현지조사 또는 문헌조사에 의하여 한반도 동백나무 분포대에서 263개의 방형구를 설정하였다. 이를 기초로 하여 식생단위를 추출하기 위해서 종조성표와 종합상재도표(Table 1)를 작성하였다 본 연구에서 한반도의 상록활엽수림은 동백나무를 중심으로 9개의 군집(群集)을 설정할 수 있다. 즉 동백나무전형군집, 동백나무-후박나무군집, 동백나무-곰솔군집, 동백나무-구실잣밤나무군집, 동백나무-까마귀쪽나무군집, 동백나무-모밀잣밤나무군집, 동백나무-붉가시나무군집, 동백나무-참식나무군집, 동백나무-생달나무군집으로 정의되었다.

• Journal of Microbiology and Biotechnology
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• 제2권1호
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• pp.66-71
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• 1992

The ecological distribution of endomycorrhizas in evergreen woody species native to the evergreen forest ecosystem of Tadohae-haesang National Park in southern Korea in February, 1989 was studied. The abundance and diversity of vesicular-arbuscular (VA) mycorrhizal fungi were also determined. The spore densities ranged from 14 to 326 per 100 g of soil. Most of the spores of mycorrhizal fungi collected from 25 soil samples belonged to the genera Glomus and Gigaspora. The frequency and number of spores in Camellia japonica varied with location. Spores belonging to the genus Gigaspora were not found in Camellia japonica in Yesongri evergreen forests adjacent to the sea. Glomus sp. was the major constituent of the spore assemblage at this site. The most abundant species in Camellia japonica in the Yesongri evergreen forests in Pogildo was Glomus borealis. In the soil of a mountain at Buwhangri, in the central location of the island at an elevation of 250 m, Gigaspora sp. was present and Glomus sp. was a major constituent of the spore assemblage. In the urban area of Haenam spore densities were much higher than in the Pogildo area. The most abundant species in Camellia japonica in the urban area of Haenam was Gigaspora sp..

• 한국산림과학회지
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• 제69권1호
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• pp.69-75
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• 1985

우리 나라의 해안도서지방(海岸島嶼地方)에 널리 천연(天然) 분포(分布)되어 있는 동백나무 (Camellia japonica)의 엽형질변이(葉形質變異)를 구명(究明)하기 위하여 집단간(集團間), 집단내(集團內)의 변이유형(變異類型)을 조사(調査)하였던 바, 그 결과(結果)를 요약(要約)하면 다음과 같다. 1) 엽장(葉長), 엽폭(葉幅), 엽면적(葉面積) 및 엽병장(葉柄長)의 특성(特性)에 있어서 죽도집단(集團)의 값이 가장 크며 제주도집단(集團)의 값이 가장 작았다. 2) 거치수(鋸齒數) 특성(特性)에 있어서는 완도집단(集團)의 것이 가장 많았으며 고창집단(集團)의 것이 가장 적었다. 3) Cork Wart의 수(數)에 있어서는 춘도집단(集團)의 것이 가장 많았고 도동집단(集團)의 것이 가장 적었다.