Brushing the surface: cascade reactions between immobilized nanoreactors

Area of Science:

• Materials Science
• Biotechnology
• Surface Chemistry

Background:

• Surface functionalization with biomolecules is key for new applications.
• Nanoreactors offer a platform for controlled biochemical reactions.
• Enzyme immobilization on surfaces is crucial for biocatalysis.

Purpose of the Study:

• To assemble and characterize novel nanoreactors on functionalized surfaces.
• To demonstrate cascade reactions using immobilized nanoreactors.
• To explore potential applications in biosensing and antimicrobial materials.

Main Methods:

• Synthesis of poly(dimethylsiloxane)-block-poly(2-methyl-2-oxazoline) (PDMS-b-PMOXA) diblock copolymers.
• Immobilization of nanoreactors onto poly(2-hydroxyethyl methacrylate)-co-poly(2-aminoethyl methacrylate hydrochloride) (PHEMA-co-P(2-AEMA·HCl)) brushes via biotin-streptavidin interaction.
• Surface-initiated atom transfer radical polymerization (ATRP) for brush grafting.
• Characterization using spectroscopy, TEM, LS, AFM, and QCM-D.
• Demonstration of enzymatic cascade reactions.

Main Results:

• Successful assembly of two types of nanoreactors with specific bio-catalysts and biopores.
• Stable immobilization of nanoreactors on functionalized surfaces.
• Demonstration of a two-step cascade reaction converting Amplex® Red to resorufin.
• Detailed characterization of nanoreactor binding and catalytic activity.

Conclusions:

• Proof-of-principle for catalytically functional engineered surface materials.
• Foundation for advanced functional surfaces in biosensing, medical implants, and antimicrobial materials.
• Highlights the versatility of PDMS-b-PMOXA copolymers for nanoreactor assembly.