Abstract
The aim of the present study was to compare the performances of gas chromatography/mass spectrometry (GC/MS) and gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) in stable isotope kinetic studies. In the analysis of cholesterol and leucine, GC/C/IRMS gave precise and linear results over a large scale of 13C enrichment (-22 to +760 delta/1000 for cholesterol, -26 to +600 delta/1000 for leucine). Compared with GC/MS, GC/C/IRMS was much more accurate and reproducible, especially at low [13C]-cholesterol enrichment (-12 delta/1000), with cholesterol samples ranging from 0.11 to 17 ng. Cholesterol ester kinetics in rabbit plasma low-density lipoproteins was studied after injection of 3 mg [3,4-(13)C]cholesterol. A smooth and regular kinetic curve was obtained with GC/C/IRMS; results were much less reproducible with GC/MS. Finally, the performances of GC/C/IRMS were demonstrated in the simultaneous kinetic study of three human plasma apolipoproteins during a primed constant infusion of 0.7 mg.kg-1.h-1 L-[l-13C]leucine. Kinetic curves were obtained in very-low-density lipoproteins and low-density lipoproteins for apolipoprotein B100, and in high-density lipoproteins for apolipoproteins AI and AIL.
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