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Calibration curve and equation of (a) DPPH test, (b) TEAC method and (c) FRAP method. Relative antioxidant activity was expressed as percentage of absorbance decrease and subsequently calculated to equivalent content of Trolox. Each sample was measured in triplicates with relative standard deviation below 2 %. Absorbance of DPPH test was measured at wavelength λ = 515 nm, TEAC at λ = 734 nm and FRAP at λ = 593 nm.
