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| - Identification of (12-Ricinoleoylricinoleoyl)diricinoleoylglycerol,an Acylglycerol Containing Four Acyl Chains, in Castor(Ricinus communis L.) Oil by LC-ESI-MS
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| - An acylglycerol (AG) containing four acyl chains, (12-ricinoleoylricinoleoyl)diricinoleoylglycerol (RRRR),was positively identified for the first time in a natural source in castor oil using electrospray ionizationtandem mass spectrometry (ESI-MS/MS). HPLC-purified RRRR from castor oil was subjected to iontrap and high-resolution ESI-MS/MS. The precursor and fragment ions of [RRRR + Na]+ showedthe expected masses, and the sodiated fragment ions of both diacylglycerols and fatty acids weredetected. Because fragment ions of fatty acids from [AG + NH4]+ adducts cannot be detected byESI-MS/MS, [AG + Na]+ adducts are more informative. Radiolabeled triricinolein (RRR) wasincorporated into RRRR in castor microsomes, indicating that RRRR is biosynthesized in castor bean.This newly identified and biosynthesized RRRR represents a new AG subclass of tetra-acylglycerols(or acylacyldiacylglycerol). Keywords: Castor oil; ricinoleate; acylglycerol; tetra-acylglycerol; acylacyldiacylglycerol; biosynthesis;HPLC; Ricinus communis L.
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