Functionalization of Bacterial Cellulose and Related Surfaces Using a Facile Coupling Reaction by Thermoresponsive...

Area of Science:

• Materials Science
• Biochemistry
• Organic Chemistry

Background:

• Bacterial cellulose (BC) is a promising biomaterial due to its purity and biocompatibility.
• Chemical modification can enhance BC properties but often requires harsh conditions that damage its structure.
• Developing mild modification techniques is crucial for preserving BC's integrity and expanding its applications.

Purpose of the Study:

• To explore the Suzuki coupling methodology for chemically modifying bacterial cellulose under mild conditions.
• To investigate the use of a thermoresponsive catalyst for efficient and environmentally friendly cellulose modification.
• To demonstrate the versatility of the method for altering BC surface properties, such as wettability.

Main Methods:

• Utilized Suzuki coupling reactions on bacterial cellulose (BC), kombucha-derived BC (KBC), and cotton-cellulose (CC) surfaces.
• Employed a novel thermoresponsive catalyst: a poly(N-isopropylacrylamide) (PNIPAM)-tagged N-heterocyclic carbene (NHC)-based palladium(II) complex.
• Performed modifications in aqueous media under mild, temperature-controlled conditions, facilitating catalyst separation.

Main Results:

• Successfully achieved covalent modification of cellulose surfaces without compromising their 3D structure.
• Demonstrated the method's effectiveness in altering surface wettability, creating hydrophobic BC-based materials.
• Showcased fluorescent labeling capabilities of the modified materials.

Conclusions:

• The Suzuki coupling methodology offers a gentle and effective approach for bacterial cellulose modification.
• The use of a thermoresponsive catalyst simplifies the process and aligns with green chemistry principles.
• Modified BC materials exhibit tunable properties, expanding their utility in biomaterials and other applications.