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Related Experiment Videos

Solid-state UV laser-induced fluorescence detection in capillary electrophoresis.

K C Chan1, G M Muschik, H J Issaq

  • 1Analytical Chemistry Laboratory, SAIC Frederick, NCI-Frederick Cancer Research and Development Center, MD 21702, USA. chan@mail.ncifcrf.gov

Electrophoresis
|July 6, 2000
PubMed
Summary

Compact solid-state UV lasers enable sensitive laser-induced fluorescence (LIF) detection for peptides and amino acids. This cost-effective method achieves nanomolar sensitivity for native tryptophan compounds and fluorescamine-labeled analytes.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Biochemistry

Background:

  • Laser-induced fluorescence (LIF) is a sensitive detection technique.
  • Capillary electrophoresis (CE) offers efficient separation of biomolecules.
  • Existing LIF systems can be expensive and bulky.

Purpose of the Study:

  • To evaluate the utility of compact, inexpensive solid-state UV lasers for LIF detection in CE.
  • To demonstrate the sensitivity and applicability of this system for various compounds.

Main Methods:

  • Utilized two solid-state UV lasers (266 nm and 355 nm) for LIF detection.
  • Separated compounds using capillary electrophoresis.
  • Analyzed native tryptophan-containing proteins/peptides and fluorescamine-labeled amino acids/peptides.

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Main Results:

  • Achieved nanomolar (nM) level detection for native tryptophan compounds and indoles at 266 nm.
  • Enabled nM level detection for fluorescamine-labeled amino acids and peptides at 355 nm.
  • Demonstrated detection of amino acids as low as 10 ng/mL after fluorescamine labeling.

Conclusions:

  • Solid-state UV lasers provide a stable, sufficient power source for sensitive LIF detection.
  • This approach offers a cost-effective and compact alternative for biomolecule analysis.
  • The method is effective for both native fluorescence and derivatized analytes, including tryptic digests.