Antibacterial Activity of Tea Polyphenols against Phytopathogenic Bacteria

Fukai, Katsuhiko; Ishigami, Tadashi; Hara, Yukihiko

doi:10.1080/00021369.1991.10870886

Cited by 39 publications

(56 citation statements)

References 3 publications

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“…Detailed physicochemical studies suggested that the bactericidal activities of galloylated tea catechins at the cell membrane level might be due to their specific perturbations of the ordered structure of phosphatidylcholine and phosphatidylethanolamine present in bacterial cell wall membranes [27]. Fukai et al [28] reported that the activities of the TF were similar to those of the simple catechins. TF are the products formed when catechins are oxidized and dimerized.…”

Section: Antimicrobial Activity Of Individual Catechinmentioning

confidence: 90%

Antimicrobial Activities of Tocklai Vegetative Tea Clones

et al. 2011

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Thirty-one Tocklai vegetative (TV) tea clones contained caffeine and total catechin 44.39 and 227.55 mg/g dry weight of leaves, respectively. The (-)-epigallocatechin gallate (EGCG) was the most abundant (109.60 mg/g) followed by -(-)-epigallocatechin (EGC, 44.54 mg/g), (-)-epicatechin gallate (ECG, 41.74 mg/g), (-)-epicatechin (EC, 27.42 mg/g) and ?catechin (4.25 mg/g). Total catechins were highest in TV 20 (509.7 mg/g) and lowest in TV 6 (71.7 mg/g). The tea clones that contain high level of total catechin exhibited the strongest antimicrobial activity. Among caffeine and flavanol compounds, theaflavins (TF) present in black tea possess a similar antimicrobial potency as EC present in fresh leaves, and that the conversion of catechins to TF during fermentation in making black tea tends to alter their antimicrobial activities. The bioactive molecules other than catechins present in tea leaves may also contribute towards antimicrobial activity.

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Section: Antimicrobial Activity Of Individual Catechinmentioning

confidence: 90%

Antimicrobial Activities of Tocklai Vegetative Tea Clones

et al. 2011

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“…Catechins are polyphenols that are abundantly found in tea leaves and have various beneficial effects on health promotion, such as antioxidative (Kawase et al, 2000;Yoshino et al, 1994;Ho et al, 1992), antiallergic (Ohmori et al, 1995;Sano et al, 1999), antimutagenic, anticarcinogenic (Jankun et al, 1997;Shiraki et al, 1994;Yamane et al, 1991), and antibacterial (Fukai et al, 1991) activities.…”

Section: Introductionmentioning

confidence: 99%

Effect of Green Tea Extract on Copper Dynamics in Mouse Hair

Kawase

Saito

Nakano

et al. 2013

FSTR

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“…The hot water extract from green tea (GTE) is known to possess various beneficial pharmacological and physiological effects, such as antibacterial (Fukai et al, 1991;Toda et al, 1991;, antiviral (Green, 1949;Nakayama et al, 1990;, antifungal , antioxidative (Matsuzaki and Hara, 1985;Osawa et al, 1988), antihemolysin (Ikigai et al, 1990;Okubo et al, 1989), antimutagenic (Apotolides et al, 1996;Jain et al, 1989;Wang et al, 1989) and antitumor (Katiyar et al, 1993a;1993b;Wang et al, 1992; activities. These effects of GTE are thought to be due to polyphenolic constituents contained in green tea.…”

Section: Introductionmentioning

confidence: 99%

Suppressive effect of (-)-epigallocatechin gallate on 7,12-dimethylbenz[a]anthracene-induced chromosome aberrations in rat bone marrow cells

Ito¹

2005

Environ. Mutagen Res.

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The suppressive effect of (-)-epigallocatechin gallate (EGCG), the major polyphenolic constituent present in green tea, on 7,12-dimethylbenz [a]anthracene (DMBA)-induced chromosome aberrations (CA) in rat bone marrow cells was studied. Rats given EGCG before the DMBA injection displayed a considerably suppressed frequency of DMBA-induced CA in their bone marrow cells. The suppressive effect of EGCG (60 mg/kg body weight) given 24 h before was observed 24, 30, 48 and 72 h after the DMBA injection, but not at the early period (6, 12 and 18 h) after the DMBA treatment. On the other hand, EGCG (60 mg/kg body weight) given 0.5 h before DMBA suppressed DMBA-induced CA at all periods after the DMBA injection. The suppression of EGCG given 24 h or 0.5 h before was observed for all doses of DMBA (25, 50, 75 and 100 mg/kg) investigated. EGCG given at 60 mg/kg body weight 0.5 h before the DMBA injection showed greater suppressive effect than the same dose given 24 h before. The suppressive effect of EGCG given 0.5 h before was dosedependent in the range of 20 60 mg/kg body weight. Methyl methanesulfonate (MMS: direct-acting carcinogen)-induced CA were not suppressed by EGCG.The administration of dehydroepiandrosterone (DHEA), a typical substrate for hydroxysteroid sulfotransferases, 0.5 h before DMBA injection also significantly suppressed DMBA-induced CA but DHEA given 24 h before did not.These results suggest that EGCG has two different suppression mechanisms for DMBA-induced CA depending on the administration time. The suppression of DMBA-induced CA by EGCG given 24 h or 0.5 h before may result from the modification of microsomal enzyme system or the inhibition of sulfotransferase activity by EGCG, respectively. We have previously reported (Ito et al., 1989) that the administration of GTE or GTP mixture before aflatoxin B 1 (AFB 1 ) injection in rats significantly suppressed AFB 1 -induced chromosome aberrations (CA) in bone marrow cells. Furthermore, we have reported (Ito and Ito, 2001) the suppressive effect of EGCG on AFB 1 -induced CA in rat bone marrow cells. EGCG given 24 h before the AFB 1 injection suppressed AFB 1 -induced CA but not when given 2 h before; the same was true for GTE or GTP mixture. This suppression seems to be due to modification of the microsomal enzyme system by EGCG.In this study, we investigated the suppressive effect of EGCG on CA induced by 7,12-dimethylbenz[a]anthracene (DMBA: indirect-acting carcinogen, as is AFB 1 ) and by methyl methanesulfonate (MMS: direct-acting carcinogen, needs no metabolic activation). Materials and Methods ChemicalsEGCG was purchased from Kurita Kogyo Co. (Tokyo, Japan). DMBA, dehydroepiandrosterone (DHEA) and colchicine were obtained from Wako Pure Chemicals Co. (Tokyo, Japan), MMS was from Aldrich (Milwaukee, WI), and dimethyl fulfoxide (DMSO: spectrophotometric grade) was from E. Merck A.G., (Darmstadt, F.R.G.). Animal experimentsMale rats of the Wistar strain (Charles River Japan, Inc., Kanagawa, Japan), aged 28 35 days and weighing 80 110 g, were used. Each...

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Antibacterial Activity of Tea Polyphenols against Phytopathogenic Bacteria

Cited by 39 publications

References 3 publications

Antimicrobial Activities of Tocklai Vegetative Tea Clones

Antimicrobial Activities of Tocklai Vegetative Tea Clones

Effect of Green Tea Extract on Copper Dynamics in Mouse Hair

Suppressive effect of (-)-epigallocatechin gallate on 7,12-dimethylbenz[a]anthracene-induced chromosome aberrations in rat bone marrow cells

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