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Characterization of Glucocerebrosides and the Active Metabolite 4,8-Sphingadienine from Arisaema amurense and Pinellia ternata by NMR and CD Spectroscopy and ESI-MS/CID-MS

Rozema, Evelien, Popescu, Ruxandra, Sonderegger, Harald, Huck, Christian W., Winkler, Johannes, Krupitza, Georg, Urban, Ernst, Kopp, Brigitte
Journal of agricultural and food chemistry 2012 v.60 no.29 pp. 7204-7210
Arisaema, Pinellia ternata, apoptosis, cell proliferation, cytotoxicity, digestive system, dissociation, eggplants, foods, hydrolysis, mass spectrometry, metabolites, nuclear magnetic resonance spectroscopy, rhizomes, silica gel, sphingolipids, spinach
Sphingolipid metabolites regulate cellular processes such as cell proliferation, differentiation, and apoptosis. In this study, glucocerebrosides (GluCer) from rhizomes of Arisaema amurense and Pinellia ternata were fully characterized using 1- and 2-dimensional nuclear magnetic spin resonance (NMR) and circular dichroism (CD) spectroscopy and tandem collision-induced dissociation mass spectrometry (ESI-MS/CID-MS). Three new acylated and seven known GluCer were elucidated with 4,8-sphingadienine (4,8-SD, d18:2) as backbone. 4,8-SD is a metabolite after enzymatical hydrolysis of GluCer in the gut lumen. In this study, 4,8-SD was hydrolyzed from GluCer and chromatographically purified on silica gel. In contrast to the GluCer, 4,8-SD showed cytotoxic effects in the WST-1 assay. GluCer with 4,8-SD as sphingoid backbone are present in plants consumed as food, such as spinach, soy, and eggplant.