We evaluated the antioxidant and antimicrobial activity of a methanolic extract of the roots of Arisaema jacquemontii. Antioxidant activity was determined in the 1,1-diphenyl-2-picryl-hydrazyl (DPPH), nitroblue tetrazolium (NBT) and ferric reducing power tests. The extract had significant antioxidant activity in all assays, with values of 64.16 ± 0.19% in the DPPH and 62.16 ± 0.17% in the NBT assays, and reduced Fe 3+ ferricyanide complex to the ferrous form (Fe 2+ ). Antibacterial activity and minimum inhibitory concentrations were calculated by the broth dilution method. The root extract prevented the growth of both Gram-positive and Gram-negative bacteria, at a minimum inhibitory concentration of 0.24-0.41 mg/mL. Antifungal activity, measured as inhibition of mycelium growth, was 28.32-36.50%. The antimicrobial and antioxidant activities of the extracts were positively associated with the total phenolic and flavonoid contents of the extract.

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