High-performance liquid chromatography interfaced with fluorescence line-narrowing spectroscopy for on-line analysis

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Chromatography

Background:

• Polycyclic Aromatic Hydrocarbons (PAHs) and DNA adducts are significant environmental and health concerns.
• Accurate identification and characterization of these compounds require sensitive and high-resolution analytical techniques.
• Existing methods may face limitations in sensitivity, spectral resolution, or photodegradation.

Purpose of the Study:

• To develop and demonstrate a novel analytical system for the on-line identification and characterization of analytes.
• To interface High-Performance Liquid Chromatography (HPLC) with Fluorescence Line-Narrowing Spectroscopy (FLNS).
• To achieve high spectral resolution and minimize photodegradation for enhanced analyte detection.

Main Methods:

• Design and construction of a novel liquid helium cryostat compatible with HPLC and capillary electrophoresis/electrochromatography.
• Utilizing Fluorescence Line-Narrowing Spectroscopy (FLNS) at 4.2 K for high spectral resolution and reduced photodegradation.
• Proof-of-principle demonstration using a mixture of structurally similar polycyclic aromatic hydrocarbons (PAHs).

Main Results:

• Successful interfacing of HPLC with FLNS for on-line analyte analysis.
• Demonstrated femtomole detection limits for the HPLC-FLNS system.
• Application to the analysis of DNA adducts from mouse skin exposed to dibenzo[a,l]pyrene.

Conclusions:

• The developed HPLC-FLNS system offers a powerful tool for sensitive and high-resolution analysis of complex mixtures.
• This technique is suitable for real-world applications, including the detection of environmental pollutants and biomarkers.
• The system minimizes photodegradation, allowing for indefinite detection times and signal averaging.