A novel analytical platform based on liquid chromatography and tandem mass spectrometry using atmospheric pressure photoionization was applied for the simultaneous quantification of free and esterified β-sitosterol, campesterol, brassicasterol, and stigmasterol. The total time for sample pretreatment and analysis could be reduced from ∼3 h [gas chromatography-mass spectrometry (GC-MS)] to 15 min. The detection limits of the different phytosterols ranged between 0.25 and 0.68 μg/l. Linear ranges were between 1 and 1,000 μg/l. The within-run and between-run variabilities ranged between 1.4% and 9.9%. The analytical sensitivity was at least 150-fold higher compared with GC-MS. Our new method allows a rapid and simultaneous determination of free and esterified phytosterols in serum.
CITATION STYLE
Lembcke, J., Ceglarek, U., Fiedler, G. M., Baumann, S., Leichtle, A., & Thiery, J. (2005). Rapid quantification of free and esterified phytosterols in human serum using APPI-LC-MS/MS. Journal of Lipid Research, 46(1), 21–26. https://doi.org/10.1194/jlr.C400004-JLR200
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