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Matrix-assisted Laser Desorption/Ionization Time of Flight (MALDI-TOF) Mass Spectrometric Analysis of Intact Proteins Larger than 100 kDa
Published on: September 9, 2013
Matrix-assisted laser desorption/ionization time-of-flight mass analysis of peptides
1Genentech, Inc., South San Francisco, California, USA.
Current Protocols in Protein Science
|April 23, 2008
Summary
Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) offers high sensitivity for peptide mass analysis. This technique excels with various sample types and simplifies data interpretation for biomolecular research.
Area of Science:
- Analytical Chemistry
- Biochemistry
- Biophysics
Background:
- Matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is a key technique for biomolecule mass determination.
- It offers superior sensitivity and tolerance to salts and buffers compared to other ionization methods.
- MALDI-MS routinely achieves subpicomole detection limits for peptides.
Purpose of the Study:
- To provide an overview of MALDI-MS for peptide analysis.
- To discuss instrument configuration, calibration, and sample preparation.
- To highlight specific applications in analyzing peptide mixtures, synthetic peptides, and modified peptides.
Main Methods:
- Detailed discussion of MALDI-MS instrument setup and calibration procedures.
- Exploration of various sample preparation techniques tailored for peptides.
- Presentation of analytical strategies for complex peptide samples.
Main Results:
- MALDI-MS provides accurate mass determination of peptides.
- Protonated molecules (M+H+) are the common ions observed, simplifying analysis.
- High sensitivity and buffer tolerance are demonstrated.
Conclusions:
- MALDI-MS is a powerful and versatile tool for peptide mass spectrometry.
- The technique facilitates the analysis of diverse peptide samples, including mixtures and modified forms.
- Ease of data interpretation enhances its utility in biomolecular research.
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