Abstract: Phytochemical investigation of the methanolic extract of Tagetes minuta L. (Asteraceae) leaves resulted in the isolation and identification of two new compounds: 5-methyl-2,2',5',2'',5'',2''',5''',2''''-quinquethiophene (1) and quercetagetin-6-O-(6-O-caffeoyl-β-D-glucopyranoside) (9), in addition to seven known compounds: quercetin-3,6-dimethyl ether (2), quercetin-3-methyl ether (3), quercetin (4), axillarin-7-O-β-D-glucopyranoside (5), quercetagetin-3,7-dimethoxy-6-O-β-D-glucopyranoside (6), quercetagetin-7-methoxy-6-O-β-D-glucopyranoside (7), and quercetagetin-6-O-β-D-glucopyranoside (8). The compounds were identified by UV, IR, 1D, 2D NMR, and HRESIMS spectral data. They showed significant antioxidant activity, comparable with that of propyl gallate. Compounds 8 and 3 showed weak to moderate antileishmanial and antimalarial activities, with IC50 values of 31.0 μg/mL and 4.37 μg/mL, respectively.
Keywords: Tagetes minuta; Asteraceae; thiophene; quercetagetin; antioxidant; antimicrobial; antileishmanial; antimalarial
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Al-Musayeib, N.M.; Mohamed, G.A.; Ibrahim, S.R.M.; Ross, S.A. New Thiophene and Flavonoid from Tagetes minuta Leaves Growing in Saudi Arabia. Molecules 2014, 19, 2819-2828.
Al-Musayeib NM, Mohamed GA, Ibrahim SRM, Ross SA. New Thiophene and Flavonoid from Tagetes minuta Leaves Growing in Saudi Arabia. Molecules. 2014; 19(3):2819-2828.
Al-Musayeib, Nawal M.; Mohamed, Gamal A.; Ibrahim, Sabrin R.M.; Ross, Samir A. 2014. "New Thiophene and Flavonoid from Tagetes minuta Leaves Growing in Saudi Arabia." Molecules 19, no. 3: 2819-2828.