Abstract
Methanol extract of Indigofera hirsuta, was evaluated for its antiradical potential and capacity in inhibiting lipoxygenase and aldose/aldehyde reductase enzymes. The ethyl acetate fraction derived from the methanol extract partition, showed the greatest antioxidant capacity, while the butanol was the strongest inhibitor of lipoxygenase enzyme. All fractions (diethyl ether, ethyl acetate, butanol and the aqueous residue) exhibited strong inhibition capacity of both aldose/aldehyde reductase enzymes, which comes in agreement with the ethnomedicinal plant utilization as an antidiabetic agent. LC-DAD-MS(ESI+) fraction analysis verified the findings above, leading to a conclusion regarding the biological activities attributed to the main compounds. Phytochemical analysis led to the identification of an indolic dimer, cinnamic acids, phenolics, flavonoid glycosides, a cyclic polyol, the rare sugar 1-methyl-β-D-glucopyranoside and glycerol. Many of these compounds were isolated for the first time in Indigofera species while the indolic dimer was isolated for the first time in the Fabaceae family.
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