Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.chroma.2011.05.011
Title: Derivatization-independent cholesterol analysis in crude lipid extracts by liquid chromatography/mass spectrometry: Applications to a rabbit model for atherosclerosis
Authors: Shui, G. 
Cheong, W.F.
Jappar, I.A.
Hoi, A.
Xue, Y.
Fernandis, A.Z.
Tan, B.K.H.
Wenk, M.R.
Keywords: Cholesterol
Cholesterol esters
Cholesterol oxidation products
Multiple reaction monitoring (MRM)
Issue Date: 15-Jul-2011
Citation: Shui, G., Cheong, W.F., Jappar, I.A., Hoi, A., Xue, Y., Fernandis, A.Z., Tan, B.K.H., Wenk, M.R. (2011-07-15). Derivatization-independent cholesterol analysis in crude lipid extracts by liquid chromatography/mass spectrometry: Applications to a rabbit model for atherosclerosis. Journal of Chromatography A 1218 (28) : 4357-4365. ScholarBank@NUS Repository. https://doi.org/10.1016/j.chroma.2011.05.011
Abstract: Direct measurement of various sterols in crude lipid extracts in a single experiment from limited biological samples is challenging. Current mass spectrometry (MS) based approaches usually require chemical derivatization before subjecting to MS analysis. Here, we present a derivatization-independent method for analyzing various sterols, including cholesterol and its congeners, using liquid chromatography and atmospheric pressure chemical ionization mass spectrometry. Based on the specific tandem mass spectrometry pattern of cholesterol, multiple reaction monitoring (MRM) transitions were used to quantify free cholesterol and its fatty acyl esters. Several cholesterol oxidation products could also be measured using the upfront liquid chromatography separation and specific MRM transitions. The method was validated alongside established enzymatic assays in measuring total cholesterol. As a proof of concept, we analyzed plasma sterols in rabbits administrated with a high cholesterol diet (HCD) which is a classical atherosclerotic model. Free cholesterol, cholesterol esters, 7-hydroxycholesterol, and 7-ketocholesterol were elevated in plasma of rabbits on HCD. This method could also serve as an excellent tool for quantitative analysis of other sterols such as ergosterol and sitosterol in other organisms beside mammalian. In Saccharomyces cerevisiae, our results indicated dramatic increases of the ratio of ergosterol esters to free ergosterol in both yeh2Δ and tgl1Δ cells, which are consistent with the function of the respective enzymes. © 2011 Elsevier B.V.
Source Title: Journal of Chromatography A
URI: http://scholarbank.nus.edu.sg/handle/10635/116972
ISSN: 00219673
DOI: 10.1016/j.chroma.2011.05.011
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

43
checked on Oct 12, 2021

WEB OF SCIENCETM
Citations

41
checked on Oct 12, 2021

Page view(s)

109
checked on Oct 14, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.