Table 1.
Total phenolic content and antioxidant activity of non-polar blackberry and grape seed extracts.
| Non-Polar Blackberry Seed Extracts | ||||
| Sox | BD | US | p-Value | |
| TPC (mg GAE/100 mL) | 7.37 ± 0.25 | 102.37 ± 4.38 | 7.31 ± 0.30 | <0.001 |
| DPPH (mg AAE/100 mL) | 6.91 ± 0.10 | 11.50 ± 0.44 | 2.07 ± 0.13 | <0.001 |
| TRC (mg QE/100 mL) | ND | 46.42 ± 1.64 | ND | <0.001 |
| Fe2+ chelating ability (mg EDTAE/100 mL) | 261.12 ± 12.13 | 17.12 ± 0.43 | 77.57 ± 0.12 | <0.001 |
| Yield (%) | 20.7 | 13.3 | 7.7 | |
| Non-Polar Grape Seed Extracts | ||||
| Sox | BD | US | p-Value | |
| TPC (mg GAE/100 mL) | 7.21 ± 0.18 | 28.61 ± 0.50 | 7.01 ± 0.29 | <0.001 |
| DPPH (mg AAE/100 mL) | 6.18 ± 0.39 | 35.36 ± 0.99 | 3.95 ± 0.20 | <0.001 |
| TRC (mg QE/100 mL) | ND | 19.36 ± 0.34 | 125.89 ± 1.60 | <0.001 |
| Fe2+ chelating ability (mg EDTAE/100 mL) | 155.01 ± 1.20 | 18.62 ± 0.13 | 74.70 ± 0.60 | <0.001 |
| Yield (%) | 31.9 | 20.0 | 12.6 | |
Note: Sox = Soxhlet, BD = Bligh–Dyer, US = ultrasound, GAE = gallic acid equivalent, AAE = ascorbic acid equivalent, QE = quercetin equivalent, EDTAE = ethylenediamine tetraacetic acid equivalent, ND = not detected, TPC = total phenolic content, TRC = total reducing capacity.