Fluorimetric estimation of DNA content using sensitized lanthanide fluorescence

Area of Science:

• Analytical Chemistry
• Biochemistry
• Materials Science

Background:

• Lanthanide ions are crucial in various fields, but their direct detection can be challenging.
• DNA interactions can significantly alter the properties of molecules, including luminescence.
• Developing sensitive methods for DNA quantification is essential in biological and medical research.

Purpose of the Study:

• To investigate the fluorescence enhancement of lanthanides upon complexation with calf thymus DNA.
• To explore the potential of this phenomenon for sensitive DNA quantification.
• To examine the effect of TOPO addition on the terbium-DNA complex in a micellar environment.

Main Methods:

• Studying lanthanide (terbium and europium) fluorescence in aqueous solutions.
• Utilizing calf thymus DNA as a sensitizer for lanthanide fluorescence.
• Employing Triton X-100 micellar medium and TOPO for complexation studies.
• Quantifying DNA using the ligand-sensitized lanthanide fluorescence enhancement.

Main Results:

• Complexation with calf thymus DNA significantly enhanced terbium and europium fluorescence by nearly two orders of magnitude.
• The DNA-sensitized lanthanide fluorescence allowed for DNA estimation at a 10 ppb level.
• Addition of TOPO to the Tb-DNA complex in Triton X-100 micellar medium did not result in synergistic fluorescence enhancement.

Conclusions:

• Lanthanide fluorescence enhancement upon DNA complexation offers a highly sensitive method for DNA detection.
• This approach provides a quantitative tool for estimating DNA concentrations.
• The absence of synergistic enhancement with TOPO suggests specific interaction dynamics within the micellar system.