Mass spectrometry of N-substituted amino acids and their derivatives: Correlation of the abundances of the M+. and selected fragment ions of metamers

The mass spectral fragmentations of nineteen new metameric N-(E)-stilbenyloxyalkylcarbonyl- [or (E)-(4′-chlorostilbenyloxyalkylcarbonyl)]-substituted amino acids and their metameric methyl esters and hydrazides were investigated. Fragmentation pathways are proposed on the basis of accurate mass and metastable transition measurements. The correlation between the intensities of M^+. and the selected fragment ions of these compounds is discussed. The data obtained create the basis for distinguishing metamers.