Table 4

Total phenolic content, antioxidant activity and oxidative stability of RSO samples.

Parameter Extraction methods    

  Supercritical (CO2) Hydraulic-press Screw-press Solvent
Total phenolic content (mg of GAE/g) 22.18 ± 1.13a 17.25 ± 1.07b 13.74 ± 0.55c 18.10 ± 1.43b
DPPH radical-scavenging activity (%) 65.47 ± 2.08a 57.52 ± 1.33b 49.59 ± 0.74c 55.67 ± 1.09b
EC50 (mg/mL) 0.507d 0.577c 0.661a 0.593b

EC50 value, the effective concentration at which the antioxidant activity was 50% and it was obtained by extrapolation from linear regression analysis; data are expressed as mean ± standard deviation of three determinations.

Values in the rows with different letters (a–d) are significantly different (p < 0.05). The same letters at the same column are not significant (p < 0.05).

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