Add time:08/26/2019         Source:sciencedirect.com

We have developed a methodology for quantitative analysis and concurrent identification of proteins by the modification of cysteine residues with a combination of iodoacetanilide (IAA, 1) and 13C7-labeled iodoacetanilide (13C7-IAA, 2), or N-ethylmaleimide (NEM, 3) and d5-labeled N-ethylmaleimide (d5-NEM, 4), followed by mass spectrometric analysis using nano liquid chromatography/nanoelectrospray ionization ion trap mass spectrometry (nano LC/nano-ESI-IT-MS). The combinations of these stable isotope-labeled and unlabeled modifiers coupled with LC separation and ESI mass spectrometric analysis allow accurate quantitative analysis and identification of proteins, and therefore are expected to be a useful tool for proteomics research.

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