Highlights
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Antioxidant activity of AWE and its subfractions were evaluated for the first time.
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WS2 fractions exhibited the strongest antioxidant activities.
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Antioxidant components in WS2 were identified by LC-MS, MALDI-TOF-MS and 13C NMR.
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Fatty acid compositions of Averrhoa carambola were also investigated by GC–MS.
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A. carambola was a source of natural antioxidants and unsaturated fatty acids.