Phytochemical study on ethyl acetate fraction of Lepidium obtusum Basin.

Three undescribed compounds (1-3), including two butenolides and one indol alkaloids. Together with twenty-one known compounds (4-24) were isolated and identified from Lepidium obtusum Basin. Their structures were elucidated by spectroscopic analysis and ECD calculations. The isolated compounds were tested for their antimicrobial, antioxidant, and anti-inflammatory activities. Among them, compounds 11, 12, 14, 21 and 23 showed moderated antimicrobial activities against (Candida albicans, E. coli, Staphylococcus aureus). Compounds 11, 12, 14, 15, 17 and 18 exhibited potent antioxidant activities against ABTS and DPPH. Compound 1 exhibited moderated anti-inflammatory activities. Compounds 4-24 were isolated from this plant for the first time.

Two new glucoside derivatives of truxinic and cinnamic acids from Lavandula angustifolia mill.

A phytochemical investigations on the n-butanol fraction of Lavandula angustifolia Mill. residues resulted in the isolation of ten compounds, including two new ones, 4,4'dimethoxy-2,2'di-O-ß-d-glucopyranosyl-truxinate (1) and 2-(ß-d-glucosyloxy)-trans-cinnamic acid butyl ester (2), along with eight known compounds. The structures of compounds were confirmed by NMR and HR-ESI-MS techniques and comparison with published data. The NMR data for 3 were attributed for the first time. Compound 2 was proofed to be a natural compound in plant rather than a butyl ester artifact formed by esterification reaction with butanol by comparative HPLC-DAD analysis with the ethanol extract which was obtained prior to the application of butanol. All isolated compounds were evaluated for their antioxidant and anti-hypoglycaemic activities. Among them, compounds 4 and 5 showed strong anti-oxidant activities against DPPH with IC50 values of 12.99 and 31.74 µM, respectively. Compound 5 exhibited moderate inhibitory activity against PTP1B with an IC50 value of 31.28 µM.