Radical scavenging capacities and inhibition of human prostate (LNCaP) cell proliferation by Fortunella margarita

► The order antioxidant capacity was MeOH-water > EtOAc > MeOH > n-hexane > acetone. ► Active compounds were identified as flavonoids in polar extracts by LC-MS. ► Hexane extract induces caspase mediated apoptosis in LNCaP cells. ► First report on inhibition of LNCap cells by kumquats.