Electropolymerizable Thiophene-Oligonucleotides for Electrode Functionalization.

Area of Science:

• Materials Science
• Biotechnology
• Electrochemistry

Background:

• Immobilizing complex biomolecules like oligonucleotides (ONs) onto synthetic polymers is crucial for developing functionalized materials.
• Existing methods face challenges in achieving efficient and stable covalent attachment of ONs.

Purpose of the Study:

• To introduce a novel single-step method for the covalent immobilization of ONs onto a polymer matrix.
• To synthesize and utilize novel thiophene phosphoramidite building blocks for creating lipid thiophene-oligonucleotide (L-ThON) conjugates.
• To demonstrate the utility of L-ThONs in creating stable biofunctionalized interfaces via electropolymerization.

Main Methods:

• Synthesis of modified lipid thiophene-oligonucleotide (L-ThON) conjugates using a new thiophene phosphoramidite building block.
• Direct electropolymerization of L-ThONs with 2,2'-bithiophene (BTh) on indium tin oxide electrodes to form a copolymer film.
• In situ electroconductance measurements and microstructural analysis to confirm L-ThON incorporation.
• Hybridization studies to assess the functionality of the immobilized ONs.

Main Results:

• Successful synthesis of modified L-ThONs.
• Formation of a copolymer film containing incorporated L-ThONs within the BTh backbone via electropolymerization.
• Demonstrated covalent immobilization of ONs onto the electrode surface.
• Confirmation of selective hybridization of the immobilized ONs with complementary targets.

Conclusions:

• Lipid thiophene-oligonucleotide (L-ThON) conjugates can be effectively synthesized and incorporated into polymer films using electropolymerization.
• The developed method provides a stable and direct route for creating biofunctionalized interfaces.
• L-ThONs are promising for the development of advanced oligonucleotide-based bioelectrochemical platforms.