New epimeric spirostanol and furostanol-type steroidal saponins from Cestrum laevigatum L

Abstract

Four new epimeric spirostanol and furostanol-type steroidal saponins, (25R,S)-5α-spirostan-2α,3β-diol 3-O-β-D-glucopyranosyl-(1→4)-β-D-galactopyranosyl-(1→4)-β-D-galactopyranoside, (25R,S)-5α-spirostan-2α,3β-diol 3-O-β-D-glucopyranosyl-(1→2)-α-L-rhamnopyranosyl-(1→4)-β-D-galactopyranoside, 26-O-β-D-glucopyranosyl-(25R,S)-5α-furost-20-ene,2α,3β-diol 3-O-β-D-galactopyranoside and 26-O-β-D-glucopyranosyl-(25R,S)-5α-furost-20-ene,2α,3β-diol 3-O-β-Dgalactopyranosyl-(1→4)-β-D-galactopyranoside, in addition to the known (25R,S)-5α-spirostan-2α,3β-diol 3-O-β-D-galactopyranoside, were isolated from Cestrum laevigatum. Compounds were submitted to cytotoxic activity assays using colorectal adenocarcinoma (HCT-116), human promyelocytic leukemia (HL-60), ovarian carcinoma (OVCAR-8), glioma (SF-295) human cancer cell lines, and the antimicrobial activity was evaluated against Candida parapsilosis, C. albicans, C. krusei, Pseudomonas aeruginosa, Staphylococcus aureus and Bacillus subtilis.