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Updated: Jul 15, 2026

Metabolic Labeling and Membrane Fractionation for Comparative Proteomic Analysis of Arabidopsis thaliana Suspension Cell Cultures
Published on: September 28, 2013
Quantitative analysis of complex peptide mixtures using FTMS and differential mass spectrometry
Fanyu Meng1, Matthew C Wiener, Jeffrey R Sachs
1Molecular Profiling Proteomics, Merck Research Laboratories, Merck and Co. Inc., Rahway, New Jersey 07065, USA.
Abstract:
Label-free LC-MS profiling is a powerful quantitative proteomic method to study relative peptide abundances between two or more biological samples. Here we demonstrate the use of a previously described comparative LC-MS method, differential mass spectrometry (dMS), to analyze high-resolution Fourier transform mass spectrometry (FTMS) data for detection and quantification of known peptide differences between two sets of complex mixtures. Six standard peptides were spiked into a processed plasma background at fixed ratios from 1.25:1 to 4:1 to make two sets of samples. The resulting mixtures were analyzed by microcapillary LC-FTMS and dMS. dMS successfully identified five out of the six peptides as statistically significant differences (p
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