Antibacterial and bactericidal activities of Japanese green tea.

Toda, Masako; Okubo, Sachie; Ohnishi, Reiko; Shimamura, Tadakatsu

doi:10.3412/jsb.44.669

Cited by 96 publications

(70 citation statements)

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“…Carcinoma in situ and papillary non-invasive tumors were classified as pTis and pTa, respectively. Tumors that had invaded into the submucosal layer, superficial muscle layer, deep muscle layer and perivesical fat or the contiguous organ were classified as pT 1 , pT 2 , pT 3 or pT 4 , respectively.…”

Section: Examinationmentioning

confidence: 99%

Inhibition of urinary bladder tumors induced by N‐butyl‐N‐(4‐hydroxybutyl)‐nitrosamine in rats by green tea

Sato

1999

Int J of Urology

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Background: Recently, the anticarcinogenic effects of green tea have been studied in sites other than the urinary tract. The present study examined the inhibition by green tea of vesical tumors induced in rats by Nbutyl-N-(4-hydroxybutyl) nitrosamine (BBN). Methods:In the first series of experiments, 0.05% BBN was added to the drinking water of rats and remained present for 5 weeks. In one experiment, six groups of animals received either tap water, green tea, matcha, hojicha, oolong tea or black tea from week 6. In a second experiment, three groups of rats received either tap water, green tea extract or powdered green tea mixed into a pellet diet from week 6. In a third experiment, five groups of rats were fed a pellet diet with addition of either 0, 0.15, 1.5 or 3.0% powdered green tea from week 6. All rats were killed and examined at 40 weeks. Results: Green tea, particularly green tea leaves, dose-dependently inhibited the growth of BBN-induced urinary bladder tumors when given after the carcinogen. Conclusions: Green tea may inhibit bladder tumor growth.

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Section: Examinationmentioning

confidence: 99%

Inhibition of urinary bladder tumors induced by N‐butyl‐N‐(4‐hydroxybutyl)‐nitrosamine in rats by green tea

Sato

1999

Int J of Urology

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“…Tea possesses bactericidal activity against various bacteria that cause diarrheal diseases (7,8), and inhibits the activity of their exotoxins in vitro (5). We recently found that tea protects against Vibrio cholerae O1 in animal models (10), and that catechins obtained from green tea leaf have both bactericidal and toxin-inhibitory activities (4,9).…”

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confidence: 99%

The Protective Activity of Tea Catechins against Experimental Infection by Vibrio cholerae O1

Toda

Okubo

Ikigai

et al. 1992

Microbiology and Immunology

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“…WTS had the broadest antibacterial spectrum; indeed it was active against the five bacteria species, although with different inhibition strength. Similarly, a previous study demonstrated that extracts and fractions of green tea had bacteriostatic activity against some vibrio species (Toda et al, 1989). Also, multiple lethality hurdles to the growth of pathogens including Listeria monocytogenes, Escherichia coli and Salmonella typhimurium can be provided by using lesser amount of chemical antimicrobials in combination with natural antimicrobials from green tea and grape seed extracts (Gadang et al, 2008;Chanet al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Boran¹,

Ciftci²,

Er³

et al. 2015

Turk. J. Fish. Aquat. Sci.

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In aquaculture, bacterial fish diseases are still one of the most serious problem and fish mortality of bacterial origin can cause significant economic losses worldwide. The evolution of microorganism resistance to antibiotics has resulted in growing need for new antibacterial compounds. In the present study, the antibacterial activity of green tea (Camellia sinensis L.)seed and its secondary metabolite saponin were evaluated on five bacterial fish pathogens that cause diseases in rainbow trout (Oncorhynchus mykiss, Walbaum). In addition to this, possible histological effects were investigated on the vital organs of fish. The antibacterial activity of tea seed and saponin were determined using the agar diffusion method. Watered tea seed (WTS) powder and saponin used in this research as the feed additives demonstrated antibacterial activity against the five pathogens but statistically significant inhibition was observed only with Listonella anguillarum. Accordingly, significantly higher survival levels were observed in fish infected with L. anguillarum in WTS and saponin diet groups. However, organs of fish fed with WTS and saponin showed some nonvital symptoms such as hyperplasia and epithelial lifting in the gills and lipid droplets, intercellular edema and nuclear degeneration in liver. Results from this study confirmed the potential use of WTS as a source of antibacterial compounds or as a feed additive for prevention of disease against L. anguillarum infection in trout culture.Keywords: Tea seed, saponin, antibacterial activity, histopathology, rainbow trout.Yeşil Çay (Camellia sinensis L.) Tohumunun Bazı Balık Patojenlerine Karşı Antibakteriyel Aktivitesinin Gökkuşağı Alabalıklarında (Oncorhynchus mykiss, Walbaum) Değerlendirilmesi ÖzetAkuakültürde bakteriyel balık hastalıkları günümüzde hala en önemli problemlerden bir tanesini oluşturmakta ve bakteriyel kaynaklı balık ölümleri dünya çapında önemli ekonomik kayıplara sebep olabilmektedir. Mikroorganizmalarda antibiyotiklere karşı direnç gelişimi, yeni antibakteriyel bileşiklere olan ihtiyacın artmasına neden olmuştur. Bu çalışmada, yeşil çay (Camellia sinensis L.) tohumu ve onun ikincil bir metaboliti olan saponinin gökkuşağı alabalıklarında (Oncorhynchus mykiss, Walbaum) hastalığa sebep olan beş farklı bakteriyel balık patojeni üzerindeki antibakteriyel aktiviteleri araştırılmıştır. Ayrıca, balıkların hayati organlarına ait dokularda oluşabilecek histopatolojik etkiler incelenmiştir. Çay tohumu ve saponinin antibakteriyel aktivitesi agar difüzyon yöntemi kullanılarak belirlenmiştir. Bu çalışmada yem katkı maddesi olarak kullanılan sulandırılmış çay tohumu (SÇT) tozu ve saponin beş balık patojenine karşı antibakteriyel aktivite göstermiştir, fakat sadece Listonella anguillarum bakterisine karşı istatistiksel olarak önemli derecede bir etki tespit edilmiştir. Benzer şekilde, L. anguillarum ile enfekte edilen balıklarda, SÇT ve saponin diyet gruplarında istatistiksel olarak önemli derecede bir hayatta kalma oranı gözlenmiştir. Bunun yanında, SÇT ve s...

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Antibacterial and bactericidal activities of Japanese green tea.

Cited by 96 publications

References 0 publications

Inhibition of urinary bladder tumors induced by N‐butyl‐N‐(4‐hydroxybutyl)‐nitrosamine in rats by green tea

Inhibition of urinary bladder tumors induced by N‐butyl‐N‐(4‐hydroxybutyl)‐nitrosamine in rats by green tea

The Protective Activity of Tea Catechins against Experimental Infection by Vibrio cholerae O1

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