The extract of Ya-hom Intajak exhibited moderate DPPH scavenging activity with an IC50 value
of 99.08 µg/ml and a FRAP value of 1.12 mmol FeSO4/g. Among the individual plants, Terminalia
chebula Retz., Caesalpinia sappan L., Cinnamomum bejolghota (Buch.-Ham.) and Ci. verum J. Presl,
showed strong antioxidant activities. T. chebula was the most potent plant in the DPPH assay while Ca. sappan had the highest FRAP value. Among the extracts, the dichloromethane fraction showed the highest inhibitory effect on LDL peroxidation with a half maximal inhibitory concentration (IC50) value comparable to that of probucol (0.82 µg/ml). Pearson correlation analysis revealed that total phenolic content (TPC) showed high positive correlations with FRAP (r = 0.908, p < 0.01) and DPPH activities (r = 0.648, p < 0.01).