A review of latest research findings on the health promotion properties of tea

Dufresne, Christine; Farnworth, E. R.

doi:10.1016/s0955-2863(01)00155-3

Cited by 444 publications

(297 citation statements)

References 184 publications

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“…Plants rich in tannins are known for their antihemorrhagic, healing, and antiinflammatory properties and in the treatment of diarrhea, hypertension, rheumatism, gastritis, ulcers, and kidney disorders (Dufresne and Farnworth, 2001). Finally, the triterpenoids are known for their antihyperalgesic, antiinflammatory, and antimicrobial activities (Tepe et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial and antioxidant activity of essential oil and different plant extracts of Psidium cattleianum Sabine

et al. 2016

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The goals of the study were to determine: the antimicrobial and antioxidant activities of essential oil and plant extracts aqueous and ethanolic of Psidium cattleianum Sabine; the chemical composition of the essential oil of P. cattleianum; and the phytochemical screening of aqueous and ethanolic extracts of the same plant. Regarding the antimicrobial activity, the ethanolic extract exhibited moderate antimicrobial activity with respect to bacteria K. pneumoniae and S. epidermidis, whereas, regarding other microorganisms, it showed activity considered weak. The aqueous extract and the essential oil showed activity considered weak, although they inhibited the growth of microorganisms. About the antioxidant potential, the ethanolic and aqueous extracts exhibited a scavenging index exceeding 90%, while the essential oil didn´t show significant antioxidant activity. Regarding the phytochemical composition, the largest class of volatile compounds identified in the essential oil of P. cattleianum included the following terpenic hydrocarbons: α-copaene (22%); eucalyptol (15%), δ-cadinene (9.63%) and α-selinene (6.5%). The phytochemical screening of extracts showed the presence of tannins, flavonoids, and triterpenoids for aqueous and ethanolic extracts. The extracts and essential oils inhibit the growth of microrganisms and plant extracts showed significant antioxidant activity. Also, the phytochemical characterization of the essential oil showed the presence of compounds interest commercial, as well as extracts showed the presence of important classes and compounds with biological activities.Keywords: Psidium cattleianum, antimicrobial action, microdilution, GC-MS, antioxidant activity. Atividade antimicrobiana e antioxidante do óleo essencial e diferentes extratos vegetais de Psidium cattleianum Sabine ResumoOs objetivos do trabalho foram determinar: as atividades antimicrobiana e antioxidante do óleo essencial e dos extratos vegetais aquoso e etanólico de Psidium cattleianum Sabine; a composição química do óleo essencial P. cattleianum e a triagem fitoquímica dos extratos vegetais aquoso e etanólico da mesma planta. Quanto à atividade antimicrobiana, o extrato etanólico apresentou atividade antimicrobiana moderada frente as bactérias K. pneumonieae e S. epidermidis, enquanto frente aos demais micro-organismos apresentou atividade considerada fraca. O extrato aquoso e o óleo essencial apresentaram atividade considerada fraca, embora tenham inibido o crescimento dos micro-organismos. Em relação ao potencial antioxidante, os extratos etanólico e aquoso apresentaram índice de sequestro superior a 90%, enquanto o óleo essencial não apresentou atividade antioxidante significativa. Para a composição fitoquímica, a maior classe de compostos voláteis identificados no óleo essencial de P. cattleianum foram os hidrocarbonetos terpênicos, sendo eles: α-copaeno (22%), eucaliptol (15%), δ-cadineno (9,63%) e α-selineno (6,5%). Na triagem fitoquímica dos extratos verificou-se a presença de taninos, flavonóides e triterpenói...

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Section: Resultsmentioning

confidence: 99%

Antimicrobial and antioxidant activity of essential oil and different plant extracts of Psidium cattleianum Sabine

et al. 2016

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“…Green tea polyphenols (GTPs) are water-soluble components such as (-)-epigallocatechin gallate (EGCG), (-)-epicatechin gallate (ECG), (-)-epicatechin (EC) and (-)-epigallocatechin (EGC). These catechins have strong antioxidant activity (Rice-Evans, 1999;Dufresne and Farnworth, 2001;Higdon and Frei, 2003); they are potent scavengers of reactive oxygen species (ROS) such as superoxide, hydrogen peroxide, hydroxyl radicals and nitric oxide produced by various chemicals (Guo et al, 1996;Vinson et al, 2002;Schroeder et al, 2003). It has been demonstrated that EGCG prevents spontaneous mutations (Mure and Rossman, 2001), LDL oxidation (Yamanaka et al, 1997) and chromosomal damage induced by ROS in somatic cells (Sugisawa and Umegaki, 2002;Roy et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effects of epigallocatechin-3-gallate on the developmental competence of parthenogenetic embryos in the pig

Yavari

Naoi

Kaedei

et al. 2010

Italian Journal of Animal Science

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This study was conducted to examine the effects of (-)-epigallocatechin gallate (EGCG) supplementation on the developmental competence and quality of parthenogenetic porcine embryos during culture. Parthenogenetic embryos derived from in vitro matured oocytes were cultured for eight days in a modified North Carolina State University (NCSU)-37 solution supplemented with EGCG at different concentrations (0, 1, 5, 10 and 50 µM). Supplementation of 1 and 5 µM EGCG during in vitro culture of embryos showed no significant influence on the rate of cleavage or that of blastocyst formation or on the total cell number and DNA fragmentation indices of blastocysts when compared to those of a control group. However, when 10 and 50 µM EGCG were supplemented into the culture medium, the cleavage rates were significantly lower than those of the other groups. No embryo developed to the blastocyst stage. Results suggest that treatment with low EGCG during in vitro culture has no influence on the developmental competence of porcine embryos but the presence of high concentrations of EGCG is apparently harmful for in vitro development of porcine parthenotes.

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“…Some studies have shown that green tea consumption is associated with a reduced risk of cardiovascular diseases, degenerative diseases, and cancer [2][3][4]. The potential health benefits associated with tea consumption have been partially attributed to the antioxidative properties of polyphenols, particularly to catechins, among which EGCG is the most effective.…”

mentioning

confidence: 99%

Hepatotoxicity from green tea: a review of the literature and two unpublished cases

Mazzanti

Menniti‐Ippolito²,

Moro

et al. 2009

Eur J Clin Pharmacol

344

251

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Purpose To review the current literature on suspected green tea-related hepatic reactions and to describe two new cases reported within the framework of the Italian surveillance system of natural health products. Results A literature search of publication between 1999 and October 2008 retrieved 34 cases of hepatitis. Histological examination of the liver revealed inflammatory reactions, cholestasis, occasional steatosis, and necrosis. A positive dechallenge was reported in 29 cases. There was one reported death. A positive rechallenge occurred in seven cases (20%). In the two new cases, the causality assessment was judged as "possible" according to the RUCAM score. Conclusions Our analysis of the published case reports suggests a causal association between green tea and liver damage. The hepatotoxicity is probably due to (-)-epigallocatechin gallate or its metabolites which, under particular conditions related to the patient's metabolism, can induce oxidative stress in the liver. In a few cases, toxicity related to concomitant medications could also be involved.

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A review of latest research findings on the health promotion properties of tea

Cited by 444 publications

References 184 publications

Antimicrobial and antioxidant activity of essential oil and different plant extracts of Psidium cattleianum Sabine

Antimicrobial and antioxidant activity of essential oil and different plant extracts of Psidium cattleianum Sabine

Effects of epigallocatechin-3-gallate on the developmental competence of parthenogenetic embryos in the pig

Hepatotoxicity from green tea: a review of the literature and two unpublished cases

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