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Registros recuperados: 9
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Ascorbate protects (+)-catechin from oxidation both in a pure chemical system and human plasma Biol. Res.
LOTITO,SILVINA B; FRAGA,CESAR G.
We evaluated the interaction between ascorbic acid (AA) and (+)-catechin (CTCH) in potassium phosphate solution, pH 7.4 (PPS) and in human plasma. In both systems, the oxidation was started by adding 2,2’-azobis-(2-amidinopropane) clorhidrate (AAPH). The concentrations of AA and CTCH were determined by HPLC using electrochemical detection. In PPS, CTCH was oxidized by AAPH (50 muM), in either the absence or presence of different initial concentrations of AA (25-200 muM). In the presence of AA, CTCH depletion was delayed, an effect that was dependent upon the initial concentration of AA. When 100 muM AA was added after the oxidation had begun, CTCH depletion was arrested for 30 min. The kinetics of AA oxidation by AAPH was also characterized in PPS. AA (100...
Tipo: Journal article Palavras-chave: Catechins; Antioxidants; Free radicals; Procyanidins.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200015
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Effect of chlorocholine chlorid on phenolic acids accumulation and polyphenols formation of buckwheat plants Biol. Res.
Sytar,Oksana; Borankulova,Asel; Hemmerich,Irene; Rauh,Cornelia; Smetanska,Iryna.
BACKGROUND: Effect of chlorocholine chloride (CCC) on phenolic acids composition and polyphenols accumulation in various anatomical parts (stems, leaves and inflorescences) of common buckwheat (Fagopyrum esculentum Moench) in the early stages of vegetation period were surveyed. RESULTS: Treatment of buckwheat seeds with 2% of CCC has been increased content of total phenolics in the stems, leaves and inflorescences. On analyzing the different parts of buckwheat plants, 9 different phenolic acids - vanilic acid, ferulic acid, trans-ferulic acid, chlorogenic acid, salycilic acid, cinamic acid, p-coumaric acid, p-anisic acid, methoxycinamic acid and catechins were identified. The levels of identified phenolic acids varied not only significantly among the plant...
Tipo: Journal article Palavras-chave: Chlorocholine chloride; Phenolic acids; Catechins; Buckwheat.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100019
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Flavonoids, total phenolics and antioxidant capacity: comparison between commercial green tea preparations Ciênc. Tecnol. Aliment.
Kodama,Débora Harumi; Gonçalves,Any Elisa de Souza Schmidt; Lajolo,Franco Maria; Genovese,Maria Inés.
The potential health benefits attributed to green tea and its catechins such as antioxidant effects, cancer chemoprevention, and weight loss have led to a huge increase of green tea products in the food market. The objectives of this work were to analyze and compare these products in terms of phenolic contents and in vitro antioxidant capacity including tea bags, dehydrated leaves, and ready-to-drink preparations after standardization of the infusion preparation procedure. Total phenolics content in 1 cup of the different teas varied from 90 to 341 mg of catechin equivalents, and the highest and the lowest values were both those of the ready-to-drink products. Infusions prepared from tea bags had contents varying from 96 to 201 mg.200 mL-1, and there were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidant capacity; Catechins; Total phenolics; Green tea.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000400037
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Influence of phenolic compounds of Kangra tea [Camellia sinensis (L) O Kuntze] on bacterial pathogens and indigenous bacterial probiotics of Western Himalayas BJM
Sourabh,Aditi; Kanwar,S.S.; Sud,R.G.; Ghabru,Arti; Sharma,O.P..
Phenolic compounds of nutraceutical importance viz., catechins (C), (-)-epicatechin (EC), (-)-epigallocatechin (EGC), (-)-epigallocatechin-3-gallate (EGCG) and (-)-epicatechin-3-gallate (ECG) were estimated in fresh green tea shoots of Camellia sinensis (L) O Kuntze cultivar. The total polyphenols and total catechins were in the range of 219.90 to 317.81 and 140.83 to 271.39 g/kg, respectively in monthly samples of tea. The values of C, EC, EGC, EGCG and ECG in tea powders as analyzed through high performance liquid chromatography (HPLC) were in the range of 1.560 to 3.661, 13.338 to 27.766, 26.515 to 39.597, 62.903 to 102.168 and 18.969 to 39.469 mg/g, respectively. Effect of tea extracts and standard flavanols against five pathogenic bacteria viz.,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Kangra tea; Western Himalayas; Probiotics; Catechins; Antibacterial activity.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000300007
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LC-ESI-IT-MS/MS and MALDI-TOF approach: identification of natural polymers from rhizophora mangle barks and determination of their analgesic and anti-inflammatory properties. Repositório Alice
MESQUITA, L. M. de S.; RODRIGUES, C. F. B.; ROCHA, C. Q. da; BIANCHIM, M. S.; RODRIGUES, C. M.; OLIVEIRA, V. de; GAETA, H. H.; BELCHOR, M. N.; TOYAMA. M. H.; VILEGAS, W..
We recognize the chemical composition of the acetonic extract of Rhizophora mangle barks (AERM) using mass spectrometry analysis [liquid chromatography (LC)?ESI?IT-MS/MS and matrix-assisted laser desorption/ionization-time of flight-MS (MALDI-TOF)]. Analgesic activity was evaluated by formalin and tail-flick experimental assays. Anti-inflammatory activity was performed by paw edema test induced by carrageenan and 48/80 compounds. The first series of experiments involved [LC]?FIA?IT-MS/MS with 11 separated catechins derivatives until degree of polymerization 3 (DP3). The spectra obtained by MALDI-TOF analysis of the AERM presented two homologous series: one based on polymers of m/z 288 Da increments (up to DP12) and another series based on polymers of m/z...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Morphine-like effect; Catechins; Anti-inflammatory; Mangroves.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1107120
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Phytochemistry and antibacterial activity of aqueous and hydroalcoholic extracts of three medicinal plants against food pathogens Biological Sciences
Santos, Marcela Mona Sá; Silva, Filipe Miguel Pereira da; Silva, Juliana Fonseca Moreira da; Pimenta, Raphael Sanzio.
This study aimed to characterize the phytochemical compositions of three medicinal Brazilian plants’ leaves and bast extracts, and to determine their antibacterial activity on three foodborne and waterborne bacterial pathogens. Parkia platycephala, Pouteria ramiflora and Lophanthera lactescens leaves and basts were collected and aqueous and hydroalcoholic extracts were prepared. Qualitative screening of the phytochemical extracts was performed with three replicates and in triplicate in order to identify the bioactive compounds. The Minimal Inhibitory Concentration and Minimal Bactericide Concentration were determined by microdilution in broth and Escherichia coli, Salmonella typhimurium and Staphylococcus aureus growth was observed on agar plates....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Catechins; Foodborne and waterborne pathogen; Minimal bactericide concentration; Minimal inhibitory concentration..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/39674
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Quantification of catechins and caffeine from green tea (Camellia sinensis) infusions, extract, and ready-to-drink beverages Ciênc. Tecnol. Aliment.
Oliveira,Rafaela Macedo Mendes De.
This study aimed to quantify the levels of catechins and caffeine in various forms of presentation of green tea: infusion tea bags, extract, and ready-to-drink beverage and, based on their content, identify the most suitable for consumption. High Performance Liquid Chromatography (HPLC) analytical method was used for the quantification of catechins and caffeine. The tea bags had the highest concentration of total catechins with 5 to 9.5% followed by the extract with 3.64 to 4.88%, and ready-to-drink green tea beverage showed low levels of catechins, from 0.14 to 0.26%. As for caffeine content, green tea extract had higher concentration (1.96 to 3.54%) compared to the tea bags (1.39 to 1.57%). Tea bags were found the most suitable for consumption because it...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Green tea; Catechins; Caffeine; High performance liquid chromatography (HPLC).
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100024
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The cytogenetic effects of black tea and green tea on cultured human lymphocytes BABT
Eroğlu,Halil Erhan.
In this study, the cytogenetic effects of black tea and green tea were determined in cultured peripheral blood lymphocytes. Results showed that black tea and green tea induced the mitotic and replication indexes and decreased micronuclei. But these data were not statistically significant for green tea. The effects of black tea on the micronucleus formation and mitotic index were statistically significant. The decrease in micronucleus counts indicated that black tea and green tea had considerable anticlastogenic and antigenotoxic effects as observed in vitro in human lymphocytes. Thus, it could be concluded that tea polyphenols protected the normal cells from genotoxic or carcinogenic agents, which indicated the therapeutic and antioxidative role of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tea; Catechins; Micronucleus; Mitotic index; Replication index.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600011
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Zinc in the prevention of Fe2initiated lipid and protein oxidation Biol. Res.
ZAGO,M. PAOLA; VERSTRAETEN,SANDRA V.; OTEIZA,PATRICIA I..
In the present study we characterized the capacity of zinc to protect lipids and proteins from Fe2+-initiated oxidative damage. The effects of zinc on lipid oxidation were investigated in liposomes composed of brain phosphatidylcholine (PC) and phosphatidylserine (PS) at a molar relationship of 60:40 (PC:PS, 60:40). Lipid oxidation was evaluated as the oxidation of cis-parinaric acid or as the formation of 2-thiobarbituric acid-reactive substances (TBARS). Zinc protected liposomes from Fe2+ (2.5-50 muM)-supported lipid oxidation. However, zinc (50 muM) did not prevent the oxidative inactivation of glutamine synthelase and glucose 6-phosphate dehydrogenase when rat brain superntants were oxidized in the presence of 5 muM Fe2+ and 0.5 mM H2O2 .We also...
Tipo: Journal article Palavras-chave: Aluminum; Catechins; Free radicals; Iron; Lipid peroxidation; Zinc.
Ano: 2000 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602000000200014
Registros recuperados: 9
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