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Evaluation of free radical-scavenging and antihemolytic activities of quince (Cydonia oblonga) leaf: A comparative study with green tea (Camellia sinensis) IPB - Escola Superior Agrária
Costa, R.M.; Magalhães, A.S.; Pereira, J.A.; Andrade, P.B.; Valentão, P.; Carvalho, M.; Silva, B.M..
This study aimed to determine the phenolic profile and to investigate the antioxidant potential of quince (Cydonia oblonga) leaf, comparing it with green tea (Camellia sinensis). For these purposes, methanolic extracts were prepared and phenolics content of quince leaf was determined by HPLC/UV. The antioxidant properties were assessed by Folin–Ciocalteu reducing capacity assay and by the ability to quench the stable free radical 2,20-diphenyl-1-picrylhydrazyl (DPPH) and to inhibit the 2,20-azobis(2-amidinopropane) dihydrochloride (AAPH)-induced oxidative hemolysis of human erythrocytes. 5-O-Caffeoylquinic acid was found to be the major phenolic compound in quince leaf extract. Quince leaf exhibited a significantly higher reducing power than green tea...
Tipo: Article Palavras-chave: Antioxidant activity; Cydonia oblonga; Quince leaf; Hemolysis; Phenolic compounds; Camellia sinensis.
Ano: 2009 URL: http://hdl.handle.net/10198/3044
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Hongos endofíticos de Camellia sinensis muestran una actividad antimicrobiana contra el tizón del arroz Magnaporthe grisea Phyton
Zhu,XJ; Hu,YF; Chen,X; Wang,YH; Fang,WP; Li,XH.
El propósito de este estudio fue evaluar la actividad antagonista de dos cepas de hongos endofíticos, Pseudocercospora kaki y Penicillium sclerotiorum, aislados de las hojas de Camellia sinensis, en relación al patógeno del tizón del arroz Magnaporthe grisea. La actividad inhibitoria de las dos cepas endófitas sobre M. grisea en cultivo dual se comparó con aquella en monocultivo. Se confirmó que el caldo y su extracto de etil acetato del cultivo dual tuvieron una actividad mucho más inhibitoria sobre M. grisea que los monocultivos de P. kaki y P. sclerotiorum. Los índices antagonistas del caldo y extracto de etil acetato del cultivo dual sobre el crecimiento del micelio de M. grisea fueron 78,02% ± 2,19% y 62,81% ± 2,29%, respectivamente, en diferentes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Camellia sinensis; Hongos endofíticos; Cultivo dual; Actividad antimicrobiana; GC-MS.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000100008
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Phytoconstituents and antioxidant properties among commercial tea (Camellia sinensis L.) clones of Iran Electron. J. Biotechnol.
Azadi Gonbad,Reza; Afzan,Adlin; Karimi,Ehsan; Sinniah,Uma Rani; Kumara Swamy,Mallappa.
Background Tea (Camellia sinensis), a well-known beverage is consumed frequently worldwide due to its high antioxidant properties. The present study determines the amount of phytochemicals and antioxidant activities among 12 high yielding tea clones cultivated in Iran. Results Among the 12 clones studied, tea clone Iran 100 had the highest total phenolic content and total flavonoid content with values of 8.44 ± 1.03 mg gallic acid equivalents per gram dry weight and 4.50 ± 0.16 mg rutin equivalents per gram dry weight respectively. High performance Liquid Chromatography (HPLC) analysis of phenolics and flavonoids in 12 clones revealed the presence of (+)-catechin, (-)-epicatechin, (-)-epigallocatechin, (-)-epigallocatechin-gallate, (-)-epicatechingallate,...
Tipo: Journal article Palavras-chave: Camellia sinensis; DPPH assay; Methanolic extract; Total flavonoid content; Total phenolic content.
Ano: 2015 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600008
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