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Clinical Chemistry 29: 1349-1353, 1983;
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Clinical Chemistry, Vol 29, 1349-1353, Copyright © 1983 by American Association for Clinical Chemistry

Dipalmitoylphosphatidylcholine in amniotic fluid quantified by fast- atom-bombardment mass spectrometry

BC Ho, C Fenselau, G Hansen, J Larsen and A Daniel

Dipalmitoylphosphatidylcholine (DPC) is quantified by taking advantage of stable-isotope-labeled d9-DPC as internal standard. Use of a mass spectrometer to measure the ratio of d9/d0 makes this procedure a quantitative one. d9-DPC was synthesized by refluxing dipalmitoylethanolamine with d3-methyl iodide in methanol in the presence of sodium bicarbonate for 26 h. The yield of d9- phosphatidylcholine (d9-lecithin) was 89% after column-chromatographic purification. Fast atom bombardment was used to desorb the preformed phosphatidylcholine ions in a mass spectrometer of Nier-Johnson geometry. In our assessment of accuracy and precision of this technique, we found a correlation coefficient of 0.9994 between signal and sample concentration. The method was less precise when the total d0- plus d9-DPC was less than 0.2 micrograms or when the ratio of d0- to d9- lecithin exceeded 100. The within-run CV was about 1.0%. The amount of DPC in amniotic fluid samples assessed by mass spectrometry was compared with results for total phosphatidylcholine quantified by thin- layer chromatography. The fate of DPC in various laboratory manipulations was also studied.




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Copyright © 1983 by the American Association for Clinical Chemistry.