Chitin and Chitosan Biopolymer Applications

Chitin, the second most abundant natural polysaccharide after cellulose, is a linear polymer of N-acetylglucosamine found in crustacean shells, insect cuticles and fungal cell walls. Through partial deacetylation, chitin is converted into chitosan, a polycationic biopolymer with outstanding biocompatibility, biodegradability and antimicrobial activity. These intrinsic properties underpin a diverse array of applications spanning medicine, agriculture, food packaging and environmental remediation. In tissue engineering, chitosan scaffolds support cell attachment and controlled drug release, while in agriculture they serve as plant-growth enhancers and biopesticides. In water treatment, chitosan’s capacity to chelate heavy metals and dyes enables low-cost purification strategies. Over the past two years, research has focused on sustainable extraction and refinement methods, the tailoring of polymer architecture to modulate bioactivity, and the integration of chitinous materials into circular-economy biorefineries.

Research from Nature Portfolio

Recent studies have revealed that heterogeneously deacetylated chitosans display a previously unrecognised regular pattern of acetylation, with N-acetylglucosamine units enriched at every third residue. This discovery overturns the long-standing assumption of random or block-wise distribution and demonstrates that such periodicity significantly enhances plant-elicitor activity and alters enzymatic cleavage profiles. The work emphasises that precise control of deacetylation conditions can be harnessed to fine-tune chitosan’s functional properties for applications in sustainable agriculture and bioactive coatings.

Chitin and Chitosan Biopolymer Applications publication trend

The graph below shows the total number of articles in chitin and chitosan biopolymer applications across all publications each year (not limited to Nature Index journals).

Technical terms

Chitin: A linear polysaccharide of N-acetylglucosamine forming a structural component in exoskeletons and fungal walls.

Chitosan: A deacetylated derivative of chitin bearing free amino groups, soluble under acidic conditions.

Deacetylation: The chemical or enzymatic removal of acetyl groups from chitin to generate chitosan.

Degree of acetylation: The proportion of acetylated monomer units in chitin or chitosan, influencing solubility and bioactivity.

Deep eutectic solvent: A mixture of hydrogen-bond donors and acceptors forming a low-melting solvent, used for green extraction of biopolymers.

References

1. Green technologies for bio-refinery in marine crustacean shell valorisation from chitin perspective. Trends in Food Science & Technology (2024).
2. Heterogeneously deacetylated chitosans possess an unexpected regular pattern favoring acetylation at every third position. Nature Communications (2024).
3. Chitin and Chitosan Preparation from Marine Sources. Structure, Properties and Applications. Marine Drugs (2015).
4. Seafood waste: a source for preparation of commercially employable chitin/chitosan materials. Bioresources and Bioprocessing (2019).