A novel fluorescence method for determination of pFe3+

Area of Science:

• Analytical Chemistry
• Biochemistry
• Spectroscopy

Background:

• Iron(3+) plays crucial roles in biological systems.
• Accurate measurement of iron(3+) binding affinity is essential for understanding its biological functions.
• Conventional methods for determining iron(3+) binding affinity can be challenging for certain ligands.

Purpose of the Study:

• To develop and validate a novel fluorescence-based method for determining iron(3+) binding affinity (pFe(3+)).
• To assess the utility of probe CP645 for quantifying pFe(3+) values of various ligands.

Main Methods:

• Utilized fluorescence spectroscopy with probe CP645 in the presence of iron(3+) and competing ligands.
• Established a standard curve correlating fluorescence intensity with known pFe(3+) values.
• Validated the method by comparing calculated pFe(3+) values with reported values for well-studied ligands.

Main Results:

• Demonstrated a direct linear correlation between probe CP645 fluorescence intensity and pFe(3+) values.
• Achieved high accuracy in determining pFe(3+) for well-characterized ligands.
• Showcased the method's applicability to ligands with challenging measurement characteristics.

Conclusions:

• Probe CP645 provides a sensitive and accurate fluorescence-based approach for determining iron(3+) binding affinity.
• This novel method overcomes limitations of conventional spectrophotometric and potentiometric techniques.
• The developed method is valuable for characterizing ligand-metal interactions in various scientific disciplines.