Figure 10-8. NARP-HPLCeESI-MS of soybean-oil-based dietary supplement containing 2000 IU vitamin D3 on LCQ Deca XP ion-trap mass spectrometer. Mass spectra show ammonium adducts, [M + NH4]+. (A) Total ion current chromatogram (TIC); (B) extracted ion chromatogram (EIC) of full scans; (C) LnLLn; (D) LnLP; (E) MS/MS spectrum of [LnLP + NH4]+ m/z 870.7; (F) OLP; (G) OOP; and (H) MS/MS spectrum of [OOP + NH4]+ m/z 876.7. Vitamin D3 from distilled fish oil included three short-chain triacylglycerols (TAGs), CyCyCy, CyCyCa, and CaCaCy. TAGs labeled with most abundant regioisomer identified by APCI-MS. Fatty acid abbreviations are given in Fig. 10.6. APCI-MS, atmospheric pressure chemical ionization mass spectrometry; ESI-MS, electrospray ionization mass spectrometry; NARP-HPLC, nonaqueous reversed-phase highperformance liquid chromatography.
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