Fluorescent complex of pyoverdin with aluminum

Area of Science:

• Analytical Chemistry
• Environmental Science
• Microbiology

Background:

• Pyoverdin (PV), a siderophore produced by Pseudomonas fluorescens, is known for its metal-binding properties.
• Accurate determination of aluminum (Al) is crucial for environmental monitoring and understanding its toxicological effects.
• Existing methods for aluminum determination may lack sensitivity or be susceptible to interference.

Purpose of the Study:

• To investigate the fluorescence properties of pyoverdin upon binding with aluminum.
• To develop a sensitive assay for aluminum determination using pyoverdin.
• To assess the influence of iron (Fe) and other substances on the assay's performance.

Main Methods:

• Complexation of aluminum with pyoverdin from Pseudomonas fluorescens.
• Spectrofluorometric analysis of pyoverdin-aluminum complexes.
• Evaluation of interference from Fe(III) and the effect of adding Fe(III) after pyoverdin complexation.
• Testing the impact of ascorbic acid on Fe(III) interference.

Main Results:

• Pyoverdin-aluminum (PV-Al) complex formation resulted in a nearly twofold increase in fluorescence.
• Pyoverdin-iron (PV-Fe) complexes were non-fluorescent.
• The assay allowed for aluminum determination as low as 1 mug/l.
• Adding Fe(III) after PV improved the assay's performance for Al determination, while ascorbic acid did not mitigate Fe(III) interference.

Conclusions:

• The fluorescence enhancement of pyoverdin upon aluminum binding provides a sensitive method for aluminum quantification.
• The developed PV-based assay demonstrates potential for analytical applications, particularly in samples where aluminum levels are low.
• Further research into PV-Al fluorescence could yield applications in toxicological studies and environmental monitoring.