Abstract
The formation of a new derivative of aldosterone with heptafluorobutyric anhydride for gas chromatography/mass spectrometry (GC/MS) is presented. The highest and also the most prominent ion of this derivative is observed at m/z 734. The new derivative is, under the described conditions, reproducibly formed, is stable and has good gas chromatographic properties. These characteristics make the new derivative extremely suitable for selective, sensitive, precise and accurate analysis of aldosterone in serum by GC/MS in association with isotope dilution. This is proven by the agreement between the measurement results obtained by two laboratories for samples of three batches of lyophilized control serum. The sample pretreatment procedures used in each laboratory are described.
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