New lipoxygenase and cholinesterase inhibitory sphingolipids from <i>Carthamus oxyacantha</i>
作者:Muhammad Dilshad、Naheed Riaz、Muhammad Saleem、Nusrat Shafiq、Muhammad Ashraf、Tayaba Ismail、Hafiza Mehwish Rafiq、Abdul Jabbar
DOI:10.1080/14786419.2015.1075524
日期:2016.8.17
Two new sphingolipids: oxyacanthin A [(2S,3S,4R)-2-[(2R,5E)-2-hydroxyoctadec-5-enoyl]amino}hexaeicosane-1,3,4-triol; 1] and B [(2S,3S,4R)-2-[(2R,5E)-2-hydroxyoctadec-5-enoyl]amino}hexaeicosane-1,3,4-triol-1-O-beta-D-glucopyranoside; 2], together with 1-octacosanol, -sitosterol, -sitosterol 3-O-beta-D-glucopyranoside and luteolin 7-O-beta-glucopyranoside were isolated from the methanolic extract of the whole plant of Carthamus oxyacantha. Their structures were elucidated using H-1 and C-13 NMR spectra and 2D NMR analyses (HMQC, HMBC and COSY) in combination with mass spectrometry (EI-MS, HR-EI-MS, FAB-MS and HR-FAB-MS) experiments and in comparison with the literature data of the related compounds. Both the compounds 1 and 2 showed inhibitory potential against lipoxygenase (LOX) in a concentration-dependent manner with IC50 values 83.3 +/- 1.3 and 245.7 +/- 1.1 mu M, whereas compound 2 showed inhibition against enzymes acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) with IC50 values 65.3 +/- 0.1 and 93.6 +/- 0.1 mu M, respectively.[GRAPHICS].