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Wavelength-resolved fluorescence detection in capillary electrophoresis
A T Timperman1, K Khatib, J V Sweedler
1Department of Chemistry, University of Illinois, Urbana 61801.
Analytical Chemistry
|January 1, 1995
Summary
A new multichannel laser-induced fluorescence detector for capillary electrophoresis (CE) achieves yoctomole detection limits. This system simultaneously captures full emission spectra, enabling sensitive and selective analysis of analytes like amino acids.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Separation Science
Background:
- Capillary electrophoresis (CE) requires sensitive detection methods.
- Simultaneous acquisition of fluorescence spectra can enhance analyte identification.
Purpose of the Study:
- To describe a multichannel laser-induced fluorescence detector for CE.
- To achieve yoctomole limits of detection with simultaneous spectral acquisition.
Main Methods:
- Utilized an Ar/Kr mixed-gas ion laser for excitation.
- Employed a holographic grating and charge-coupled device (CCD) for spectral acquisition (500-nm window, 2-nm resolution).
- Tested with sulforhodamine 101 and fluorescein in a 50 µm i.d. capillary.
Main Results:
- Achieved yoctomole limits of detection: 5 x 10(-14) M (80 molecules) for sulforhodamine 101 and 1.5 x 10(-13) M (220 molecules) for fluorescein.
- Differentiated derivatized amino acids using emission spectra and migration times.
- Presented wavelength-resolved background spectra for various CE separation conditions.
Conclusions:
- The developed detector provides highly sensitive, spectrally resolved detection for CE.
- Simultaneous spectral acquisition aids in differentiating analytes with similar migration times.
- The system is suitable for complex CE separations with challenging backgrounds.