Laser-induced fluorescence detector for liquid chromatography: applications to protein analysis

Area of Science:

• Analytical Chemistry
• Biochemistry
• Spectroscopy

Background:

• Liquid chromatography (LC) is a key separation technique.
• Sensitive detection methods are crucial for analyzing low-concentration analytes.
• Laser-induced fluorescence (LIF) offers high sensitivity for fluorescent compounds.

Purpose of the Study:

• To develop and evaluate a novel laser-induced fluorescence detector for liquid chromatography.
• To assess the detector's performance in conjunction with gel filtration chromatography.
• To determine the limit of detection for fluorescein and a labeled protein.

Main Methods:

• Developed a laser-induced fluorescence detector system.
• Utilized argon ion laser excitation at 488 nm.
• Monitored fluorescence emission centered at 535 nm.
• Coupled the detector with gel filtration chromatography.

Main Results:

• Achieved a limit of detection of 580 femtomolar (fM) for fluorescein.
• Successfully detected bovine serum albumin (BSA) labeled with fluorescein at 500 fM.
• Demonstrated high sensitivity and applicability for biomolecule analysis.

Conclusions:

• The developed LIF detector provides excellent sensitivity for LC applications.
• This system is suitable for the trace analysis of fluorescently labeled biomolecules.
• The detector shows promise for sensitive quantification in biochemical and analytical studies.