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ISHS Acta Horticulturae 679: III WOCMAP Congress on Medicinal and Aromatic Plants - Volume 5: Quality, Efficacy, Safety, Processing and Trade in Medicinal and Aromatic Plants

RADICAL SCAVENGING ACTIVITY IN FRUIT EXTRACTS

Authors:   P. Surinut, S. Kaewsutthi, R. Surakarnkul
Keywords:   antioxidant, free radicals, DPPH
DOI:   10.17660/ActaHortic.2005.679.25
Abstract:
Phytochemicals in plants, vegetables and fruits have been reported to prevent oxidative stress related diseases, such as cancer, cardiovascular disease, cataracts, brain and immune-system dysfunction and inflammation. Many plant phenolic flavonoids have been shown to have antioxidant activity. In our study, the polyphenolic content and the radical scavenging activity of a number of Thai fruit extracts were determined by Folin-Ciocalteu reagent and scavenging of DPPH (2,2-diphenyl-1-picrylhydrazyl) radical respectively. We found that grape skins, mulberries, mango, carambola, guava and lichee possess strong activity to scavenge the DPPH radical (IC50 from 1.10 to 9.60 mg/ml). Moderate antioxidant activity was found in mangosteen, orange, pamelo, grapes and papaya (IC50 from 11.18 to 32.80 mg/ml). Low antioxidant activity (IC50 from 50.62 to 110.46 mg/ml) was found in orange juice, grape, rose apple and jackfruit.

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