METHODS FOR DISTINGUISHING ISOMERS USING MASS SPECTROMETRY

摘要

A method of distinguishing dimethylarginine isomers using tandem mass spectrometry is disclosed. The method includes the steps of ionizing a sample to generate ions; selecting ions having a mass-to-charge ratio (m/z) in an m/z range; fragmenting the selected ions t produce daughter ions; and detecting one or both of asymmetric dimethylarginine (ADMA) and symmetric dimethylarginine (SDMA) in the sample by detecting one or both of a daughter ion m/z signal at a m/z unique to ADMA and a daughter ion m/z signal at a m/z unique to SDMA.