How chitosan kills and inhibits microbes, the mechanisms behind its antimicrobial action, its spectrum of activity, and the factors that strengthen it.

Does chitosan trigger shellfish allergy? What the evidence shows about the allergen, why residual protein matters, and how purity and source reduce risk.

How chitosan fits the EU push against intentionally added microplastics: a biodegradable, natural polymer that can replace synthetic microbeads and films.

Chitosan vs cellulose compared: near-identical backbones, the decisive nitrogen difference, charge, solubility and where each natural polymer wins.

How to get water-soluble chitosan when acidic solvents aren't an option: salts, oligosaccharides and chemical derivatives compared, with selection guidance.

Dyson put chitosan in the spotlight with a hair-styling launch. Here is what chitosan actually does in cosmetics and skincare, and why its grade matters.