Zn(2+)-cyclen-based complex enable a selective detection of single-stranded thymine-rich DNA in aqueous buffer

Area of Science:

• Chemical Sensing
• Molecular Probes
• Biotechnology

Background:

• Developing selective fluorescent probes for specific DNA sequences in aqueous buffers presents a significant challenge.
• Existing probes often lack the required selectivity, leading to interference from non-target DNA sequences.

Purpose of the Study:

• To develop a highly selective fluorescent probe for detecting thymine-rich single-stranded DNA in aqueous media.
• To overcome the limitations of existing probes by enhancing selectivity and reducing background interference.

Main Methods:

• Synthesis of a novel tetraphenylethene-based Zn(2+)-cyclen complex (TPECyZn).
• Construction of a chemo-sensing ensemble using TPECyZn and phenol red.
• Evaluation of the ensemble's fluorescence response and selectivity for different DNA sequences in aqueous buffers.

Main Results:

• The TPECyZn complex showed fluorescence enhancement upon binding to thymine-rich DNA but lacked sufficient selectivity.
• The chemo-sensing ensemble effectively eliminated background fluorescence via energy transfer from TPECyZn to phenol red.
• The ensemble demonstrated high selectivity for thymine-rich single-stranded DNA, detecting sequences as short as 2 nucleotides.

Conclusions:

• The developed chemo-sensing ensemble offers a highly selective and sensitive method for detecting specific DNA sequences in aqueous solutions.
• The probe's ability to function in aqueous media makes it suitable for real-world applications.
• This work advances the development of fluorescent probes for precise DNA analysis.