• Title, Summary, Keyword: Camellia sinensis

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Isolation and Characterization of Indole-3-methylethanoate from Camellia sinensis (L.) O. Kuntz. and its biological activity

  • Roy, Malabika;Ganguly, S.N.
    • Natural Product Sciences
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    • v.3 no.2
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    • pp.106-107
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    • 1997
  • Indole-3-methylethanoate was isolated for the first time form natural source i.e. from the leaves of Camellia sinensis (L.) O. Kuntz and fully characterized by physical and chemical evidence, the biological activity of the compound was studied by wheat coleoptile bioassay which showed growth promoting activity.

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The Study on Depigmentation Effects of Aloe, Camellia sinensis and Mel (알로에(蘆회), 녹차(綠茶), 꿀(蜂蜜)의 미백효과에 관한 연구)

  • Han, Eun-jeong;Lee, Gil-young;Kim, Hae-jeong;Kim, Yoon-bum
    • The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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    • v.16 no.3
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    • pp.145-163
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    • 2003
  • Objectives : This study was performed to investigate the depigmentation effects of Aloe, Camellia sinensis and Mel. Methods : Inhibition of tyrosinase activity, melanin production & melanoma cell viability in cultured B16 melanoma cells, UV screen and cytoprotective effects on PC12 cells injured by hydrogen peroxide were measured. Results : Aloe has some inhibitory effects on tyrosinase activity, on the other hand Camellia sinensis and Mel do not have. They did not show any inhibitory effects on melanin production in melanoma cells and cytoprotective effects on PC12 cells injured by hydrogen peroxide. Aloe and Camellia sinensis have some inhibitory effects on UV screen. Conclusions : This study shows that Aloe and Camellia sinensis which were generally used for external application have some depigmentation effects. Following this, We should use them for whitening agents and the depigmentation effects of the other natural subjects which were generally used for external application should be examined.

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Effect of Water Extracts of Ganoderma lucidum, Camellia sinensis and Lycii fructus on the Lipid Stability of Walnut (영지, 녹차 및 구기자 물 추출물이 호도 지방질의 안전성에 미치는 영향)

  • 이숙경
    • Journal of Food Hygiene and Safety
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    • v.14 no.4
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    • pp.333-338
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    • 1999
  • The lipid stability of walnut added with water extracts of Ganoderma lucidum, Camellia sinensis ana Lycii fructus was studied. The results are as follows:1. when the extracts were added to walnut, the lipid stability was improved. The antioxidative activities of water extract of Camellia sinensis and Lycii fructus were considerably higher than that of Ganoderma lucidum. The antioxidative activity was decreased in the rank order Lycii fructus>Camellia sinensis>Ganoderma lucidum. 2. This clearly suggests that water extract of Lycii fructus at 4$^{\circ}C$ Bx level can be used as an alternative natural antioxidant for the lipid stability of walnut.

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A New Furocoumarin from the Leaves of Camellia sinensis(L.) O. Kuntze

  • Banerjee, Jayashree;Ganguly, S.N.
    • Natural Product Sciences
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    • v.3 no.1
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    • pp.11-13
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    • 1997
  • From the methanolic extract of defatted tender leaf of Camellia sinensis a new 4-hydroxy angular furocoumarin $C_{12}H_8O_5$, m.p. $212^{\circ}C$, was isolated using high-speed counter-current chromatographic technique. The structure of the compound was established as 4-hydroxy-2'-methoxy angular furocoumarin on the basis of physical methods viz. $^1H$ NMR, $^{13}C$ NMR and MS.

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The Effect of Camellia sinensisLINNE on Alcohol Concentration and Hangover in Normal Healthy Students (보이차(Camellia sinensis LINNE) 추출물이 정상인의 알코올 농도와 숙취에 미치는 효과)

  • Song, Im;Choi, Il-Sook;Yoon, Hea-Kyung;Koo, Sung-Ja
    • Korean journal of food and cookery science
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    • v.21 no.5
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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).

Antimicrobial Activities of Extracts of Camellia sinensis (L.) O. Kuntze and Profile of Antimicrobial Agents Resistance for Carbapenem-Resistant Enterobacteriaceae

  • Yum, Jong Hwa
    • Biomedical Science Letters
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    • v.25 no.3
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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.

Effect of Fermentation Time on the Chemical Composition of Mulberry (Morus alba L.) Leaf Teas (발효시간이 뽕잎차 구성성분에 미치는 효과)

  • Bae, Hui-Ae;Baek, Hyeon;Park, Hae-Il;Choung, Myoung-Gun;Sohn, Eun-Hwa;Kim, Sam-Hyun;Kim, Dae-Su;Chung, Ill-Min;Seong, Eun-Soo;Yu, Chang-Yeon;Lim, Jung-Dae
    • Korean Journal of Medicinal Crop Science
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    • v.19 no.4
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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.

Antimutagenic and Anticarcinogenic Potency of Green Tea(Camellia sinensis)

  • Kinae, Naohide
    • Proceedings of the Korean Society of Toxicology Conference
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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)

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Antibacterial Acativity of Camellia sinensis Extracts Against Dental Caries

  • Rasheed, Azmat;Haider, Mujtaba
    • Archives of Pharmacal Research
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    • v.21 no.3
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    • pp.348-352
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    • 1998
  • Different bacteria wwere seperated from saliva and teeth of cariogenic patients and identified by a variety of morphological and biochemical tests. Extracts of green tea strongly inhibited Escherichia coli, Streptococcus salivarius and Streptococcus mutans. The antibacterial effect of green and black tea extracts were compared with those of amoxicillin, cephradine and eugenol.

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A Study on the Antioxidation and Antimicrobial Effect of "Megmoondong(Liriope platyphylla Wang et Tang)" Water Extracts (맥문동 열수추출물의 항산화력과 항균력에 관한 연구)

  • Lee, Sook-Kyung;Park, Jong-Ho;Kim, Youn-Tae
    • The Korean Journal of Food And Nutrition
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    • v.22 no.2
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    • pp.279-285
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    • 2009
  • Antioxidant and antimicrobial efficiency were investigated for: i) water extract of green tea(Camellia sinensis), ii) water extract of middle drying megmoondong(Liriope platyphylla Wang et Tang) and iii) water extract of drying megmoondong. The electron donating ability of the green tea(Camellia sinensis) and drying megmoondong(Liriope platyphylla Wang et Tang) extract were 88 and 79, respectively, while that of the middle drying megmoondong extract showed low levels. The relative inhibitory abilities against lipid peroxidase were: green tea(Camellia sinensis) extract > drying megmoondong(Liriope platyphylla Wang et Tang) extract > middle drying megmoondong extract. The green tea(Camellia sinensis) extract showed the strongest antimicrobial effect against Staphylococcus aureus. The middle drying(Liriope platyphylla Wang et Tang) and drying megmoondong extracts showed no antimicrobial effect against Staphylococcus aureus. The green tea(Camellia sinensis) extract had the strongest antimicrobial effect against Escherichia coli. The middle drying megmoondong(Liriope platyphylla Wang et Tang) and drying megmoondong extracts showed no antimicrobial effect against Escherichia coli.