Biomimetic biobased adhesives using catechol-modified alginate and chitin

Overview

This research program develops biobased adhesives by mimicking the underwater adhesion mechanisms found in mussels and other aquatic organisms. The approach centers on catechol functionalization of natural polysaccharides, specifically alginate and chitin, to create adhesive materials that perform reliably in wet and humid conditions. The resulting adhesives are designed for food packaging applications, where they can serve as primers or coating additives to improve adhesion performance on packaging substrates.

The core innovation draws from mussel-inspired chemistry, where 3,4-dihydroxyphenyl-L-alanine (DOPA) enables strong adhesion in aqueous environments. By translating this biological principle to plant- and crustacean-derived polysaccharides, the technology offers a renewable alternative to petroleum-based adhesives while maintaining strong wet-condition performance.

Technical specifications

Key features:

• Catechol-functionalized alginate fabricated through established biomimetic chemistry approaches
• Adhesion energy in the range of 2–3 × 10⁻⁴ J/m², comparable to mussel-inspired adhesive benchmarks
• Characterization suite including FTIR, SEM, AFM, H-NMR, rheology, adhesion testing, and biocompatibility assessment
• Extension of catechol functionalization to chitin for expanded application range
• Compatibility with existing coating and adhesive primer systems used in industrial packaging
• Both base materials (alginate and chitin) are polysaccharides extractable from natural, renewable resources

How it works:

The oxidation of catechol groups generates crosslinked hydrogel networks that bond to surfaces even under wet conditions. This chemistry is applied to alginate, a polysaccharide derived from algae, and chitin, a polysaccharide sourced from crustacean shells. The resulting functionalized materials can be incorporated into primers or coatings to enhance adhesion on food packaging substrates.

Technology readiness level

The technology is currently at laboratory-scale validation. Catechol-alginate has been successfully fabricated and is undergoing characterization across multiple analytical techniques. Preliminary adhesion testing has confirmed performance within the range of established mussel-inspired adhesives. The research team has prior experience with chitin composites in applications including barrier property enhancement for polypropylene and other polymers. The proposed one-year study will extend the functionalization process to chitin and validate adhesion performance in packaging-relevant coating systems. The team is actively seeking an industry partner with capabilities in industrial-scale fabrication and coating processes to advance the technology toward commercial readiness.