Novel uses of catechins in foods

Yılmaz, Yusuf

doi:10.1016/j.tifs.2005.10.005

Cited by 196 publications

(129 citation statements)

References 52 publications

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“…Catequina e epicatequina apresentam atividade sequestradora do radical peroxila dez vezes maior que o L-ascorbato (vitamina C) e β-caroteno. 25 Portanto, todas estas informações justificam a excelente atividade antioxidante encontrada no extrato etanólico e fração hidro- …”

Section: Figura 1 Estruturas Das Substâncias Isoladas Do Extrato Etaunclassified

Constituintes químicos e atividade antioxidante de extratos das folhas de Terminalia fagifolia Mart. et Zucc

Ayres¹,

Chaves²,

Rinaldo³

et al. 2009

Quím. Nova

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Recebido em 5/8/08; aceito em 16/1/09; publicado na web em 3/7/09 CHEMICAL CONSTITUENTS AND ANTIOXIDANT ACTIVITY FROM LEAVES EXTRACTS OF Terminalia fagifolia Mart. et Zucc. Phytochemical investigation of ethanolic leaves extracts of T. fagifolia led to the isolation of (+)-catechin, sitosterol-3-O-β-D-glucopyranoside, α-and β-tocopherol, a mixture of lupeol, α-and β-amyrin, sitosterol and a mixture of glicosid flavonoids (CP-13). The structures of these compounds were identified by 1 H and 13 C NMR spectral analysis and comparison with literature data. Absolute configuration of the catechin was determinate by circular dichroism. Antioxidant activity (EC 50 ), evaluated by 2,2-diphenyl-1-picrylhidrazyl (DPPH) assay system, decreased in the order: (+)-catechin > hydroalcoholic fraction > CP-13 > aqueous fraction > EtOH extract.Keywords: Terminalia fagifolia; DPPH, antioxidant activity. INTRODUÇÃOA família Combretaceae compreende 18 gêneros, sendo Combretum e Terminalia os mais abundantes, com cerca de 370 e 200 espé-cies, respectivamente, as quais são largamente distribuídas no Oeste e Sul da África e amplamente utilizadas na medicina popular. 1As plantas do gênero Terminalia são ricas em triterpenos pentací-clicos e seus derivados glicosilados, flavonoides, taninos e outros compostos aromáticos.2 Apresentam diversas atividades farmacológicas, tais como antifúngica, anti-helmíntica, antimalárica, anticancerígena, hipoglicêmica, anti-inflamatória, antibacteriana, antioxidante, antiulcerogênica, antiviral, antidepressora, tripanocida, moluscicida, imunomodulatória e efeitos hepatoprotetor, cardioprotetor, dentre outros. Terminalia fagifolia Mart. et Zucc é uma planta encontrada no cerrado, distribuída pela Bahia, Ceará, Goiás, Distrito Federal, Piauí, São Paulo, Maranhão, Mato Grosso, Mato Grosso do Sul e Minas Gerais. É conhecida popularmente como capitão, capitão-do-mato, capitão-docerrado, capitão-do-campo, mirindiba e pau-de-bicho. A árvore é melífera e ornamental, sendo seus frutos utilizados no artesanato e a madeira pode ser empregada na marcenaria e construção civil. Na medicina popular a casca do caule é usada no combate a aftas e tumores. 4Estudos realizados com T. fagifolia demonstraram que o extrato etanólico das cascas apresenta atividades citotóxica e antioxidante, bem como a ocorrência de flavonoides (flavanonas, chalconas e flavanas), 1,3-diarilpropanos, triterpenos pentacíclicos glicosilados e não-glicosilados e um esteroide, o sitosterol.5 O extrato etanólico das folhas apresenta forte potencial antioxidante no ensaio do DPPH. 6 Nos últimos anos, um grande interesse no estudo de antioxidantes tem ocorrido devido, principalmente, às descobertas sobre o efeito dos radicais livres no organismo. Os radicais livres são moléculas orgânicas ou inorgânicas e átomos, que contêm um ou mais elétrons não empareados, instáveis e muito reativos, que causam danos às células e patologias relacionadas como artrite, catarata, câncer, diabete, disfunção cerebral, aterosclerose, doenças cardíacas e neurodegenerativas,...

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Section: Figura 1 Estruturas Das Substâncias Isoladas Do Extrato Etaunclassified

Constituintes químicos e atividade antioxidante de extratos das folhas de Terminalia fagifolia Mart. et Zucc

Ayres¹,

Chaves²,

Rinaldo³

et al. 2009

Quím. Nova

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“…It is of the interest to note that the polyphenols found in fresh green tea shoots are different from other polyphenols of plant origin as most of them are found only in leaves of tea plant. Tea catechins have been used as antioxidant compounds in many food matrices such as meats, poultries, fishes and vegetable oils (Yilmaz 2006). Since tea has an antimicrobial activity against a large spectrum of pathogenic bacteria (Chou et al, 1999, Gramza et al, 2005Friedman et al, 2006;Freidman 2007).…”

Section: Issn: 2319-7706 Volume 6 Number 10 (2017) Pp 302-313mentioning

confidence: 99%

Assessment of Metal Chelating, Bioautography and Spot Screening by TLC of Green Tea (Camellia sinensis)

Ghabru¹,

Sud²

2017

Int.J.Curr.Microbiol.App.Sci

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“…The chemical composition of green tea extract is complex, consisting of polyphenols (catechins and flavanoids), alkaloids, volatile oils, polysaccharides, amino acids, lipids, vitamin C, minerals and other compounds (Karori et al, 2007;Afify et al, 2011). Among these, the largest component present in green tea leaves is carbohydrates (including cellulosic fiber) and the simplest compounds are catechins, a group of flavanoids called flavan-3-ols (Yilmaz, 2006). Catechins and other polyphenols act as antioxidants in vitro by isolating metal ions and by scavenging ROS and nitrogen species (Dufresne and Farnworth, 2002;Frei and Higdon 2003;Wiseman et al, 1997).…”

Section: Hplc Analysis Of Gte and Gse Mixture Extractsmentioning

confidence: 99%

Synergistic Antioxidant Scavenging Activities of Grape Seed and Green Tea Extracts against Oxidative Stress

El-Beltagi

El-Desouky

Yousef

2016

Not Bot Horti Agrobo

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Grape seed and green tea extracts are reported to produce antioxidant scavenging activities against free radical toxicity. This study aimed to investigate the hypothesis that a specific combination of these extracts presents a synergistic antioxidant scavenging activities. The extracts of grape seed, green tea and their mixtures were characterized by phytochemical studies and tested for phenolics and flavonoids. In vitro antioxidant activity for individual extract and its mixtures was determined by DPPH, hydroxyl and superoxide free radical scavenging methods. The amount of total phenolics varied among the different extracts and ranged from 43.74 to 67.68 mg of gallic acid equivalents (GAE) / g dry weight, whereas total flavonoids content ranged from 4.25 to 11.66 mg of quercetin equivalents (QU) /g dry weight. The present results suggest that both extracts reported a highly contents of total phenolic and flavonoids compounds, also the mixtures of these extracts can synergistically enhance antioxidant activity. Antioxidant potential from mixture 2 (grape seed extract 200 mg: green tea extract 100 mg) was comparable to that of standard. HPLC results showed that the most abundant components in the mixture 2 extract were epigallocatechingallate while the lowest was the procyanidine.

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Novel uses of catechins in foods

Cited by 196 publications

References 52 publications

Constituintes químicos e atividade antioxidante de extratos das folhas de Terminalia fagifolia Mart. et Zucc

Constituintes químicos e atividade antioxidante de extratos das folhas de Terminalia fagifolia Mart. et Zucc

Assessment of Metal Chelating, Bioautography and Spot Screening by TLC of Green Tea (Camellia sinensis)

Synergistic Antioxidant Scavenging Activities of Grape Seed and Green Tea Extracts against Oxidative Stress

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