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Effect of EO type and concentration on ABTS radical scavenging rate. Type of EO (E) and its concentration (C) had significant effects on ABTS radical scavenging rate (PE < 0.01, PC < 0.01), and their interaction (E × C) was significant (PE × PC < 0.01). Different letters show differences (P < 0.05) among EOs. GEO: grapefruit essential oil, SEO: sweet orange essential oil, BEO: bergamot essential oil, LEO: lemon essential oil, DLEO: d-limonene essential oil, VC: Vitamin C.
