Preparation and Characterization of Metal-Tannic Acid Coated Microorganisms

Area of Science:

• Biotechnology
• Materials Science
• Microbiology

Background:

• Microorganisms are vital for medicine, environmental cleanup, and gut health.
• Challenges exist in ensuring microbial survival and targeted delivery, especially in the gastrointestinal tract.
• Metal-phenolic networks (MPNs) offer biocompatibility and tunable properties for protective coatings.

Purpose of the Study:

• To present a straightforward protocol for fabricating conformal metal-phenolic network (MPN) coatings on microorganisms.
• To demonstrate the potential of MPN-coated microorganisms for therapeutic applications.

Main Methods:

• Sequential self-assembly of iron ions (Fe3+) and tannic acid to form MPN coatings on microbial surfaces.
• Detailed procedures for material preparation, rapid coating, characterization, and functional assessment were included.

Main Results:

• A robust and straightforward protocol for MPN coating fabrication was established.
• The MPN coating demonstrated conformal coverage and protective properties for microorganisms.

Conclusions:

• The developed MPN coating strategy is simple, versatile, and efficient.
• This approach provides a promising platform for advancing probiotic encapsulation and engineered microbial therapeutics.