Surface plasmon resonance biomolecular interaction analysis mass spectrometry. 1. Chip-based analysis

Area of Science:

• Analytical Chemistry
• Biochemistry
• Biosensor Technology

Background:

• Biomolecular interaction analysis is crucial for understanding biological processes.
• Existing methods may lack the sensitivity or specificity for complex interaction studies.
• Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF) and surface plasmon resonance-based biomolecular interaction analysis (SPR-BIA) are powerful techniques.

Purpose of the Study:

• To report the combined use of SPR-BIA and MALDI-TOF for enhanced biomolecular analysis.
• To demonstrate a chip-based biosensor for simultaneous monitoring of interactions.
• To validate the identification of retained species using MALDI-TOF after SPR-BIA.

Main Methods:

• Utilized a chip-based biosensor with four flow cells for simultaneous SPR-BIA.
• Performed direct MALDI-TOF analysis on retained species within the SPR flow cells.
• Applied the combined assay to an antibody/antigen/antibody system.

Main Results:

• Achieved detection limits in the low-femtomole range.
• Demonstrated the ability to evaluate the relative stability of sequential interactions via SPR-BIA.
• Unambiguously confirmed the presence of retained species using MALDI-TOF analysis.

Conclusions:

• The integrated SPR-BIA and MALDI-TOF assay provides a sensitive and specific method for biomolecular interaction analysis.
• This combined approach allows for both quantitative interaction monitoring and qualitative identification of binding partners.
• The chip-based biosensor facilitates direct analysis of retained species, enhancing confidence in experimental findings.