Related Experiment Video
Updated: May 6, 2026
09:04
Selected Reaction Monitoring Mass Spectrometry for Absolute Protein Quantification
Published on: August 17, 2015
16.6K
Micro-Electrospray: Zeptomole/attomole per microliter sensitivity for peptides
P E Andren1, M R Emmett, R M Caprioli
1Department of Biochemistry and Molecular Biology, University of Texas Medical School, P.O. Box 20708, 77225, Houston, TX.
Journal of the American Society for Mass Spectrometry
|November 14, 2013
Summary
This study optimized a micro-electrospray ionization source for neuropeptide analysis. The enhanced method achieves high sensitivity for neurotensin detection, crucial for understanding neurological processes.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Mass Spectrometry
Background:
- Neuropeptides play vital roles in physiological processes.
- Sensitive detection of neuropeptides is essential for biological research.
- Existing analytical methods can be limited by sensitivity and complexity.
Purpose of the Study:
- To optimize a micro-electrospray ionization (MEI) source for neuropeptide analysis.
- To integrate desalting and preconcentration techniques into the MEI system.
- To enhance the sensitivity and efficiency of neuropeptide detection.
Main Methods:
- Optimization of a micro-electrospray ionization source.
- Integration of nanoliter flow-rate desalting and preconcentration into the spray needle.
- Analysis of neuropeptides, including neurotensin and methionine enkephalin, using mass spectrometry.
- Quantification of peptide ions and fragment ions to determine signal-to-noise ratios.
Main Results:
- The optimized MEI source demonstrated high sensitivity for neuropeptide analysis.
- Neurotensin was detected with a signal-to-noise ratio greater than 8:1 for 320 zeptomoles/μL.
- MS/MS analysis of neurotensin yielded a signal-to-noise ratio greater than 20:1 for 32 attomoles/μL.
- Elimination of post-column dead volumes was achieved through integrated techniques.
Conclusions:
- The developed MEI source significantly improves neuropeptide detection sensitivity.
- Integrated desalting and preconcentration enhance analytical efficiency.
- This method provides a sensitive platform for neuropeptide quantification in biological samples.
Related Concept Videos
01:12Electrospray Ionization (ESI) Mass Spectrometry
2.6K
Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
2.6K
01:33Peptide Identification Using Tandem Mass Spectrometry
6.2K
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
6.2K