DNA quantification based on FRET realized by combination with surfactant CPB

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• Quantitative DNA analysis is crucial in molecular biology.
• Existing methods often require complex separation steps.
• Developing sensitive and direct detection techniques is essential.

Purpose of the Study:

• To develop a novel, separation-free method for quantitative DNA analysis.
• To utilize fluorescence resonance energy transfer (FRET) combined with a cationic surfactant (CPB).
• To enable sensitive detection of specific DNA sequences.

Main Methods:

• Formation of a sandwich-type conjugate: FAM-capture probe-target DNA-reporter probe-TAMRA.
• Utilizing the FRET system between donor (FAM) and acceptor (TAMRA) dyes.
• Employing a cationic surfactant (CPB) to enhance FRET efficiency through DNA condensation.

Main Results:

• The addition of CPB significantly enhanced the acceptor fluorescence signal via FRET.
• A linear relationship was observed between fluorescence signal and DNA concentration (1.0 x 10^-7 to 3.0 x 10^-9 mol L^-1).
• The method achieved a detection limit of 1.0 x 10^-9 mol L^-1 for target DNA.

Conclusions:

• The developed FRET-based method with CPB surfactant provides a sensitive and direct approach for DNA quantification.
• This separation-free technique offers advantages for simplified DNA analysis.
• The method demonstrates potential for various applications requiring precise DNA concentration measurements.