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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
Published on: November 2, 2009
Identification of immobile single molecules using polarization-modulated asynchronous time delay and integration-mode
Jaroslaw Jacak1, Clemens Hesch, Jan Hesse
1Biophysics Institute, Johannes Kepler University Linz, Altenberger Strasse 69, 4040 Linz, Austria.
Analytical Chemistry
|April 13, 2010
Summary
This study introduces a new method for identifying single molecules on surfaces and characterizing their absorption dipoles. It uses time delay and integration (TDI) imaging to capture spatial and temporal fluorescence data, distinguishing static from rotating dipoles.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Biophysics
Background:
- Characterizing single molecules on surfaces is crucial for various scientific applications.
- Existing methods may lack the sensitivity or temporal resolution needed for detailed analysis.
- Previous work established a device for single-molecule microarray readout.
Purpose of the Study:
- To develop a novel data acquisition method for single-molecule identification.
- To simultaneously characterize the absorption dipole of single molecules.
- To enhance spatial and temporal information in molecular analysis.
Main Methods:
- Utilized a modified microarray readout device.
- Implemented asynchronous time delay and integration (TDI) mode imaging.
- Employed rotating excitation polarization to modulate fluorescence signals.
Main Results:
- Acquired data with both spatial and temporal information.
- Successfully discriminated static absorption dipoles from multiple or freely rotating ones.
- Demonstrated feasibility using Bovine Serum Albumin (BSA) with varying fluorophore labeling.
Conclusions:
- The developed method enables sensitive single-molecule detection and dipole characterization.
- TDI imaging provides valuable temporal data for molecular analysis.
- The technique can distinguish protein species based on labeling density.
