New Chemical Constituents from the Bark of Dendropanax morbifera Leveille and their Evaluation of Antioxidant Activities

Four new constituents, as c is-6-oxogeran-4-enyl-10-oxy- O-β-arabinopyranosyl-4′- O-β-arabinopyranosyl-2′′-octadec-9′′′,12′′′,15′′′-trienoate ( 1), geran-3(10)-enyl-1-oxy- O-β-arabinopyranosyl-4′- O-β-arabinopyranosyl-2′′-octadec-9′′′,12′′′,15′′′-trienoate ( 2), geranilan-8-oxy- O- α-d-xylopyranosyl-2′- n-octadec-9′′,12′′,15′′-trienoate ( 3), 1-cyclohex-2′, 5′-dienyl 1-cyclohexylethanol- O-β-d-xylopyranoside ( 4), along with six known constituents, guaiacol- O-β-d-arabinopyaranoside ( 5), n-tetradecanyl oleate ( 6), oleyl- O-β-d-xyloside ( 7), n-octadec-9,12-dienoyl- O-β-d-arabinopyranoside ( 8), linolenyl- O-β-d-arabinofuranoside ( 9) andglyceryl-1,3-dipalmito-2-olein ( 10), were isolated and identified from the Dendropanax morbifera bark. The new structures were established by one-and two-dimensional NMR (and in combination with IR, FAB-MSand HR-ESI-FTMS. The comparative evaluation of antioxidant potential by phosphomolybdenum, DPPH, FRAP and the NO assay of four different compounds ( 1– 4), we have found that the compounds 1 and 2 have power as a natural antioxidant, whereas the compound 3 and 4 exhibited mild activity in comparison to compounds 1 and 2