Table 4 Antioxidant activities of verified extract prepared using predictive conditions in comparison with different concentrations of BHT solutions using three tested methods.

PPPN2

93.7^a ± 1.45

0.974^ab ± 0.09

1.375^ab ± 0.24

BHT_{50 ppm}

67.7^c ± 9.96

0.633^d ± 0.04

0.655^d ± 0.12

BHT_{100 ppm}

80.2^b ± 0.87

0.800^c ± 0.03

0.967^c ± 0.11

BHT_{150 ppm}

88.1^ab ± 0.81

0.883^bc ± 0.02

1.237^bc ± 0.04

BHT_{200 ppm}

94.3^a ± 2.33

1.052^a ± 0.06

1.554^a ± 0.18

R²

0.872

0.911

0.867