Table 5 Correlation coefficients between phenolic contents versus the antioxidant capacities determined by DPPH, ABTS and β-carotene bleaching

Hydroxyphenyl acetic acid

0.200

0.470

−0.940

Gallic acid

−0.700

−0.890

0.970

Syringic acid

0.500

0.780

−1.000

Ferulic acid

−0.700

−0.860

0.980

Methyl galate

−0.300

0.030

−0.690

Vanillic acid

1.000

1.000

−0.740

Hydroxybis

−0.300

0.050

−0.700

Tyrosin

1.000

0.850

−0.300

Flavone

−0.700

−0.880

0.980

Vanillin

1.000

0.900

−0.390

(+)- Catechin hydrate

1.000

0.960

−0.530

Rutin

1.000

0.910

−0.410

Total phenolic content

−1.000

−0.880

0.340

Total flavonoid content

−1.000

−0.950

0.520