Abstract
A mixture of six aromatic amino acids has been studied by moving belt liquid chromatography-mass spectrometry (LC-MS) using both conventional and microbore columns and by thermospray LC-MS using conventional columns. Microbore columns gave the best detection limits with the moving belt interface. Thermospray LC-MS provides better sensitivity, but one of the amino acids was not detected. Methodology for the direct use of a gradient system with thermospray LC-MS has been developed. Eleven phenylthiohydantoin-amino acids were also studied using a moving belt interface. With microbore columns, detection limits for full scan electron impact spectra ranged from 2 nmol to 20 pmol.
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