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Published on: August 6, 2018
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Refining nanoflow LC and orbitrap MS data acquisition parameters for pico- and nanogram scale proteomics
Theodore R Keppel1, Yu Zhou1, John R Barr1
1Clinical Chemistry Branch, Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention (CDC), 4770 Buford Hwy., Atlanta, GA 30341, USA. dov2@cdc.gov.
Analytical Methods : Advancing Methods and Applications
|August 6, 2025
Summary
Researchers can now identify more proteins and peptides from small samples. Simple mass spectrometry (MS) method adjustments, including lowered thresholds and specific diluents, significantly boost peptide detection for limited samples.
Area of Science:
- Proteomics
- Analytical Chemistry
- Biochemistry
Background:
- Characterizing low-concentration proteomes requires advanced analytical techniques.
- Nanogram-scale peptide sample analysis presents significant challenges in proteomics.
Purpose of the Study:
- To enhance peptide and protein identification from limited samples using mass spectrometry.
- To present simple, cost-effective modifications to common mass spectrometry workflows.
Main Methods:
- Utilized Orbitrap mass spectrometry for analyzing samples of 1 nanogram or less.
- Implemented lowered precursor intensity thresholds for data-dependent acquisition.
- Incorporated n-dodecyl-β-D-maltoside (DDM) in sample diluents.
- Tested lower nanoflow liquid chromatography (nLC) flow rates.
- Applied multiple high-field asymmetric waveform ion mobility spectrometry (FAIMS) compensation voltages (CVs).
Main Results:
- Protein identifications increased by over 40% with lowered precursor intensity thresholds.
- Improved identification of late-eluting peptides using DDM-containing diluents.
- Lower nLC flow rates enhanced protein identifications by over 20%.
- Achieved an 18% increase in peptide identifications using multiple FAIMS CVs.
Conclusions:
- Simple, cost-effective modifications significantly improve peptide and protein detection in low-concentration samples.
- These methods offer practical solutions for researchers working with limited biological material.
- Enhanced proteomic profiling is achievable with optimized mass spectrometry parameters.
