Catecholamine-Copper Redox as a Basis for Site-Specific Single-Step Functionalization of Material Surfaces

Area of Science:

• Biomaterials Science
• Surface Chemistry
• Biotechnology

Background:

• Robust and facile surface functionalization is crucial for biomaterials and biotechnology.
• Current methods often face challenges in simplicity and site-specificity.

Purpose of the Study:

• To develop an operationally simple and site-specific surface functionalization method.
• To demonstrate the generalizability and biological applicability of the new approach.

Main Methods:

• Utilized a catechol-copper redox chemistry mechanism.
• Employed oxidative polymerization of alkynyl catecholamine to reduce Cu(II) to Cu(I).
• Leveraged *in situ* Cu(I) catalysis for click reactions with azide-containing molecules of interest (MOIs).

Main Results:

• Achieved drop-coating and grafting on 2D and 3D surfaces with sub-microliter volumes.
• Demonstrated immobilization of diverse MOIs with varied chemical and biological activities.
• Successfully applied the method for anti-biofouling, cellular adhesion, scaffold seeding, and tissue regeneration.

Conclusions:

• The new chemical approach integrates simplicity and precision for multipurpose surface functionalization.
• This method advances surface chemistry for biomaterial and biotechnology applications.
• Enables site-specific manipulation of cellular activities and fates.