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On-chip proteolytic digestion and analysis using "wrong-way-round" electrospray time-of-flight mass spectrometry.
I M Lazar1, R S Ramsey, J M Ramsey
1Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6365, USA.
Analytical Chemistry
|May 8, 2001
Summary
This study introduces a novel microchip device for rapid protein digestion and analysis. The technology enables fast protein identification using mass spectrometry, even with attomole quantities.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Mass Spectrometry
Background:
- Traditional protein analysis methods can be time-consuming.
- Efficient protein digestion and identification are crucial for biological research.
Purpose of the Study:
- To develop a rapid and sensitive method for protein digestion and analysis.
- To demonstrate the utility of a hybrid microchip nanoelectrospray device coupled with time-of-flight mass spectrometry.
Main Methods:
- A microchip device with microfabricated channels and a disposable nanospray emitter was utilized.
- Proteins were digested using trypsin on-chip, with real-time monitoring via electrospray.
- Peptide mass fingerprinting was employed for protein identification.
Main Results:
- Intense tryptic peptide ions were observed within minutes of sample loading.
- Proteins were identified from femtomole to attomole quantities.
- High sequence coverage (70-95%) was achieved for analyzed proteins, including human hemoglobin.
Conclusions:
- The developed microchip device offers a rapid and highly sensitive platform for protein analysis.
- This technique significantly accelerates the process of protein identification and characterization.
- The method is suitable for analyzing low-abundance proteins and complex biological samples.