Human Endogenous Metabolite
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3,4-Dicaffeoylquinic acid acts as a greater primary antioxidant than its methanol extract, by having higher ferric reducing activity (EC 50 2.18 μg/ml), β-carotene bleaching activity (EC 50 23.85 μg/ml) and DPPH scavenging activity (EC 50 68.91 μg/ml). 3,4-Dicaffeoylquinic acid exhibits a remarkable dose-dependent inhibitory effect on NCI-H23 (human lung adenocarcinoma) cell lines (EC 50 3.26 μg/ml) and is found to be apoptotic in nature based on a clear indication of DNA fragmentation. 3,4-Dicaffeoylquinic acid also displays a concentration-dependent α-glucosidase inhibition with EC 50 241.80 μg/ml.