Consulta: subjectFacets:"Catechin"
Registros recuperados: 5
Data/hora: 10/06/2024 15:03:48

Allelopathy and Allelochemicals of Eragrostis plana (Poaceae) and its Relation with Phenology and Nitrogen Fertilization
Provedor de dados: 87
Autores: CECCHIN,K.; FAVARETTO,A.; SCHEFFER-BASSO,S.M.; BERTOL,C.D.; CHINI,S.O.
ABSTRACT This study was conducted in order to verify if the phenological stage and the nitrogen fertilization interfere in the allelopathic activity and in the concentration of potentially allelopathic phenolic compounds of tough lovegrass (Eragrostis plana). The assay consisted of a bifactor 3 (0.100 and 200 kg N ha-1) x 2 (harvested in vegetative and reproductive stages), in a split plot design. The N doses constituted the main plot and the phenological stage during the harvest the subplots, resulting in six treatments. The tough lovegrass plants derived from each of the treatments were subjected to allelopathy bioassays, in which aqueous extracts of the aerial parts were applied to lettuce cypselae (Lactuca sativa) and to phytochemicals tests when...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Germinability; Phenolic acids; Catechin; Epicatechin.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100222

Protective role of antioxidant vitamin E and catechin on idarubicin-induced cardiotoxicity in rats
Provedor de dados: 56
Autores: Kalender,S.; Kalender,Y.; Ates,A.; Yel,M.; Olcay,E.; Candan,S.
Idarubicin is an anthracycline antibiotic extensively used in acute leukemia. In the present study we investigated whether vitamin E and catechin can reduce the toxic effects of idarubicin. Vitamin E (200 IU kg-1 week-1), catechin (200 mg kg-1 week-1), idarubicin (5 mg kg-1 week-1), idarubicin + vitamin E (200 IU kg-1 week-1), and idarubicin + catechin (200 mg kg-1 week-1) combinations were given to male Sprague-Dawley rats weighing 210 to 230 g (N = 6/group). Idarubicin-treated animals exhibited a decrease in body and heart weight, a decrease in myocardial contractility, and changes in ECG parameters (P&lt;0.01). Catechin + idarubicin- and vitamin E + idarubicin-treated groups exhibited similar alterations, but changes were attenuated in comparison to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Idarubicin; Catechin; Vitamin E; Cardiotoxicity; Ultrastructure.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001100017

Binding effect of proline-rich-proteins (PRPs) on in vitro antimicrobial activity of the flavonoids
Provedor de dados: 58
Autores: Ansari,Jawaad Ahmed; Naz,Shahina; Tarar,Omer Mukhtar; Siddiqi,Rahmanullah; Haider,Muhammad Samee; Jamil,Khalid.
The interaction of the cyanidin, pelargonidin, catechin, myrecetin and kaempferol with casein and gelatin, as proline rich proteins (PRPs), was studied. The binding constants calculated for both flavonoid-casein and flavonoid-gelatin were fairly large (105–107 M−1) indicating strong interaction. Due to higher proline content in gelatin, the binding constants of flavonoid-gelatin (2.5 × 105–6.2 × 107M−1) were found to be higher than flavonoid-casein (1.2 × 105–5.0 × 107 M−1). All the flavonoids showed significant antibacterial activity against the tested strains. Significant loss in activity was observed due to the complexation with PRPs confirming that binding effectively reduced the concentration of the free flavonoids to be available for antibacterial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Proline rich proteins; Flavonoids; Catechin; Myrecetin; Kaempferol; Pelargonidin; Cyanidin; Gelatin; Casein; Binding constants.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000100183

Antibacterial substances from leaves of Protium spruceanum (Burseraceae): in vitro and in silico evaluation
Provedor de dados: 60
Autores: Amparo,Tatiane Roquete; Rodrigues,Ivanildes Vasconcelos; Seibert,Janaína Brandão; Almeida,Tamires Cunha; Cabral,Vivette Appolinário Rodrigues; Vieira,Paula Melo de Abreu; Brandão,Geraldo Célio; Oliveira,Mauro Lúcio Gonçalves de; Silva,Glenda Nicioli da; Santos,Orlando David Henrique dos; Vieira Filho,Sidney Augusto; Teixeira,Luiz Fernando Medeiros; Souza,Gustavo Henrique Bianco de.
Due to the increase of bacterial resistance, the search for new antibiotics is necessary and the medicinal plants represent its most important source. The aim of this study was to evaluate the antibacterial property of extract and fractions from Protium spruceanum leaves, against pathogenic bacteria. By means of diffusion and microdilution assays, the crude extract was active against the nine bacteria tested being the hydromethanolic fraction the most active. During phytochemical procedures, procyanidin (1) and catechin (2) were identified as the main antibacterial constituents of this fraction. In silico results obtained using PASSonline tool indicated 1 and 2 as having good potential to interact with different targets of currently used antibiotics. These...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Protium spruceanum; Burseraceae; Procyanidin; Catechin; Antibacterial activity.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502020000100623

Phenolic compounds, methylxanthines and antioxidant activity in cocoa mass and chocolates produced from "witch broom disease" resistant and non resistant cocoa cultivars
Provedor de dados: 64
Autores: Leite,Paula Bacelar; Maciel,Leonardo Fonseca; Opretzka,Luiza Carolina França; Soares,Sergio Eduardo; Bispo,Eliete da Silva.
The "witch broom disease" caused by the fungus called Moniliophthora perniciosa is one of the most important cocoa diseases in Latin America, causing around 70% production reduction in the southern Bahia. In attempt to solve the problem, many cultivars resistant to the disease have been recommended to farmers. On the other hand, the chocolate flavour is composed by many compounds whose formation depends on the genetic background, environment where cocoa is grown and processing operations. Therefore, this work aimed at determining the monomeric phenolic compounds, methylxanthines and antioxidant activity of cocoa mass and dark chocolate from cocoa cultivars resistant to "witch broom disease" and non resistant to the disease. The total phenolic compounds in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Functional food; Theobromine; Caffeine; Epicatechin; Catechin.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542013000300007