Sub-part-per-million precursor and product mass accuracy for high-throughput proteomics on an electron transfer dissociation-enabled orbitrap mass spectrometer.

Molecular & Cellular Proteomics : MCP
Craig D WengerJoshua J Coon

Abstract

We demonstrate a new approach for internal mass calibration on an electron transfer dissociation-enabled linear ion trap-orbitrap hybrid mass spectrometer. Fluoranthene cations, a byproduct of the reaction used for generation of electron transfer dissociation reagent anions, are co-injected with the analyte cations in all orbitrap mass analysis events. The fluoranthene cations serve as a robust internal calibrant with minimal impact on scan time (<20 ms) or spectral quality. Following external mass calibration, 60 replicate LC-MS/MS runs of a complex peptide mixture were collected over the course of approximately 136 h (almost 6 days). Using only standard external mass calibration, the mass accuracy for a typical analysis was -3.31 +/- 0.93 ppm (sigma) for precursors and -2.32 +/- 0.89 ppm for products. After application of internal recalibration, mass accuracy improved to +0.77 +/- 0.71 ppm for precursors and +0.17 +/- 0.67 ppm for products. When all 60 replicate runs were analyzed together without internal mass recalibration, the mass accuracy was -1.23 +/- 1.54 ppm for precursors and -0.18 +/- 1.42 ppm for products, nearly a 2-fold drop in precision relative to an individual run. After internal mass recalibration, this impro...Continue Reading

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