Chemical Constituents from Dendropanax dentiger

Nineteen compounds and an HPLC inseparable mixture, composed of compounds 20 and 21, were isolated from the leaves and twigs of Dendropanax dentiger (Harms ex Diels) Merr. Of these, syringin (1) is the most abundant, 6′- O-apiofuranosyl dendranthemoside A (16) is a new megastigmane glycoside, and 3-methoxy-D-mannono-1,4-lactone (21) is a new hexono-1,4-lactone. Their structures were elucidated based on NMR spectroscopic and MS analyses.

Phytochemical Investigation of Verbesina Turbacensis Kunth: Trypanosome Cysteine Protease Inhibition by (–)-Bornyl Esters

The bark and leaf essential oils of Verbesina turbacensis were obtained by hydrodistillation and analyzed by GC-MS. The bark oil of the plant was composed mainly of monoterpene hydrocarbons (83.5-90.4%), predominately α-pinene, while the leaf oil was composed mainly of sesquiterpene hydrocarbons, dominated by germacrene-D (29.1-36.9%), and δ-elemene (21.7-22.1%). Three bornyl hydroxycinnamic esters isolated from the acetone bark extract were found to inhibit the cysteine protease, rhodesain. Molecular docking analysis to probe the inhibitory interactions of the esters was also carried out.

Essential Oil Compositions and Cytotoxic Activities of Dendropanax capillaris, Oreopanax Nubigenus, and Schefflera Rodrigueziana from Monteverde, Costa Rica

The leaf essential oils of Dendropanax capillaris, Oreopanax nubigenus and Schefflera rodrigueziana (Araliaceae) were isolated by hydrodistillation and analyzed by GC-MS. The leaf oil of Dendropanax capillaris was composed of only four compounds, β-pinene (25.3%), δ-3-carene (44.7%), daucene (17.1%), and dauca-5,8-diene (12.9%). Oreopanax nubigenus leaf oil was dominated by the sesquiterpene hydrocarbons germacrene D (70.1%) and β-caryophyllene (11.8%), while Schefflera rodrigueziana leaf oil was made up entirely of sesquiterpene hydrocarbons, mostly germacrene D (27.6%), β-cubebene (27.2%), β-caryophyllene (12.2%), α-cubebene (11.1%), and α-copaene (10.8%). Both O. nubigenus and S. rodrigueziana leaf oils showed notable in-vitro cytotoxicity on MDA-MB-231 cells, which may be attributable to the relatively high concentrations of germacrene D and β-caryophyllene in those oils.