Abstract
Eggplant and related Solanum species contain abundant caffeoylquinic acid (CQA) derivatives. Fruit of the invasive species Solanum viarum Dunal contain numerous complex CQA derivatives, but only a few have been identified. The structures of two new compounds isolated from methanolic extracts of S. viarum fruit by C(18)-HPLC-DAD were determined using 2D NMR and MS data. Both include two 5-CQA molecules joined by glucose via ester and glycosidic linkages. The structures of compounds 1 and 2 (viarumacids A and B) are, respectively, 5-caffeoyl- and 3-malonyl-5-caffeoyl-[4-(1β-[6-(5-caffeoyl)quinate]glucopyranosyl)]quinic acid. The antioxidant activities determined by ABTS(•+) and DPPH(•) assays were in the order 1 > 2 > 5-CQA.
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