Abstract

A systematic approach using quantitative gas chromatography-mass spectrometry was employed to determine the origin of acetamide and propionamide in microbial pyrograms. Using model compounds, acetamide was shown to be a pyrolysis product of N-acetyl groups on the glycan backbone in cell wall peptidoglycan, and propionamide was shown to be produced from pyrolysis of the lactyl-peptide bridge portion of peptidoglycan. Levels of acetamide and propionamide in the pyrograms of microorganisms and cell wall preparations correlate with the relative amounts of peptidoglycan in these samples, with gram-positive clearly differentiated from gram-negative bacteria.

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