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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)
Ist Teil von
Food and chemical toxicology, 2009-04, Vol.47 (4), p.860-865
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2009
Link zum Volltext
Quelle
MEDLINE
Beschreibungen/Notizen
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 2,2′-diphenyl-1-picrylhydrazyl (DPPH) and to inhibit the 2,2′-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 (mean value of 227.8
±
34.9 and 112.5
±
1.5
g/kg dry leaf, respectively). Quince leaf extracts showed similar DPPH radical-scavenging activities (EC
50 mean value of 21.6
±
3.5
μg/ml) but significantly lower than that presented by green tea extract (EC
50 mean value of 12.7
±
0.1
μg/ml). Under the oxidative action of AAPH, quince leaf methanolic extract significantly protected the erythrocyte membrane from hemolysis in a similar manner to that found for green tea (IC
50 mean value of 30.7
±
6.7 and 24.3
±
9.6
μg/ml, respectively,
P
>
0.05). These results point that quince leaf may have application as preventive or therapeutic agent in diseases in which free radicals are involved.