Table 2: Free radical scavenging activities (%) of reference antioxidants and selected phenolic and flavonoid compounds at 10 µg/mL concentration for ABTS and DMPD and at 20 µg/mL for and DPPH.

Antioxidant
IC50 (µg/mL)% activityIC50 (µg/mL)% activityIC50 (µg/mL)% activityIC50 (µg/mL)% activity

BHA8.0998.6415.3415.343.6099.8023.3741.06
BHT11.8996.2815.2615.266.0499.8015.0264.60
α-Tocopherol17.2593.8515.1464.148.4770.6323.2142.00
Trolox14.1395.2113.9064.577.3983.7223.2144.00
Malvin21.3692.2116.4759.857.2081.7230.9733.06
ID-8536.4193.8517.5660.286.8082.6334.7330.66
Pelargonin67.7391.5015.8665.856.7193.5414.1363.40
Silychristin86.1691.0717.6261.716.7189.1818.1951.86
Callistephin20.6495.5712.8072.715.5499.7219.7049.60
Oenin16.7295.3515.4665.856.6099.7216.7056.40
Arachidonoyl dopamine84.1098.5018.0259.7112.5442.0023.9539.40
3,4-Dihydroxy-5-methoxybenzoic acid10.6998.6417.8064.426.0599.8011.4773.40
2,4,6-Trihydroxy benzaldehyde28.8696.7817.9370.005.2899.7216.5456.80

The IC50 values were calculated by means of radical scavenging activity graphs from the values measured at different concentrations (10–30 µg/mL) of reference antioxidants and some phenolic and flavonoid compounds.