Received: 24-04-2013
Accepted: 12-06-2013
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Antioxidant Activity and Polyphenoloxidase Inhibitory Activity of Edible Plants in Viet Nam
Keywords
Antioxidant, antioxidant activity, polyphenoloxidase, polyphenoloxidase inhibitory, edible plant
Abstract
Six edible plants in Vietnam were selected to investigate antioxidant and polyphenoloxidase inhibitory activity, including Camelliasinensis, Piper betle, Psidium guajava, Ipomoea batatas, Piper lolot, and Morinda citrifolia L.. Antioxidative activities were evaluated by DPPH free radical scavenging capacity, reducing power capacity and inhibitory of lipid oxidation in oil-in-water model. In addition, polyphenol content of six edible plants were also determined. Research results indicated that all of plants had antioxidative activity via antioxidant tests and its antioxidant ability depended on species. Polyphenol contents were different from species to species. Their values varied from 11.73 to 188.19 mg GAE/g db. Polyphenoloxidase (PPO) inhibitory activity differed with species. Psidium guajava leaf had the highest activity of PPO inhibitory (64.77%), followed by Piper betle leaf (61.66%), Camelliasinensis leaf (43.87%), Piper lolot leaf (25.59%), Morinda citrifolia L. leaf (21.93%), and Ipomoea batatas leaf (21.42%).
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