Analysis of Antioxidant Activity of Aquatic Vegetable Extracts and Its Role in Antioxidation of Rapeseed Oil
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Abstract:
The antioxidative activities of extracts from different parts of seven common aquatic vegetables and their antioxidative effects on oil were studied. ABTS free radical scavenging and DPPH free radical scavenging were used to determine the antioxidant activity of alcohol extracts and water extracts from different parts of Water chestnut, Citronella, Lotus root, Taro, Water chestnut, and Arrowhead, and oven method was used to determine their effect on rapeseed oil. The IC50 values of the three extracts with stronger DPPH free radical scavenging ability among 30 kinds of extracts were as follows: the alcohol extract of Gordon euryale (0.03 mg/mL) < the water extract of Gordon euryale (0.04 mg/mL) = the water extract of water caldron (0.04 mg/mL). The trolox contents of the three extracts with stronger ABTS free radical scavenging ability were: ethanol extract of Gordon euryale seed shell (1.42 g/g) > water extract of Gordon euryale seed shell (1.41 g/g) > ethanol extract of water caltrop shell (1.15 g/g). The POV values on the seventh day of the five extracts with 0.1% concentration were: 23.86 meq/kg, 24.06 meq/kg, 23.53 meq/kg, 24.43 meq/kg and 22.40 meq/kg, respectively. The results showed that the antioxidant effects of the five extracts on oil were not as good as 0.1% BHA. The determination of the antioxidant activity of extracts from different parts of 7 aquatic vegetables indicated that DPPH free radical scavenging ability of alcohol extract, water extract of Gordon euryale seed shell and water chestnut shell were the strongest, ABTS free radical scavenging ability of alcohol extract and water extract of Gordon euryale seed shell were the strongest. Gordon euryale seed shell aqueous extract and alcohol extract, water chestnut shell water extract and alcohol extract and lotus root section alcohol extract had certain antioxidant effect on rapeseed oil, but the effects were weaker than the same dose of BHA.
