Biodegradable plant-based packaging developed from natural fibers

A team led by engineering researchers found that chitin nanofiber films extracted from food waste unexpectedly blocked oxygen, and later combined chitin, cellulose and food-derived additives to make a biodegradable film that resists both oxygen and moisture.

Researchers shifted focus from beetle color to packaging after an unexpected laboratory result. A graduate student, Jie Wu, extracted chitin nanofibers from crab-shell food waste and produced dense films that showed low oxygen permeability. The team then developed layered coatings and formulations that combined chitin with cellulose and later added food-derived components to reduce moisture uptake. The result, reported in October 2025, is a bio-based film described as renewable, biodegradable and compostable. Key findings: - In 2014 an unexpected result showed chitin nanofiber films had low oxygen transmission compared with many packaging plastics. - In 2018 the group used spray coating to combine chitin and crystalline cellulose nanomaterials; opposite charges between the two materials improved barrier performance. - In 2024 researchers found that combining carboxymethylcellulose with citric acid reduced moisture uptake by forming cross-links in the cellulose. - In October 2025 the team combined these approaches to produce a film that resists both oxygen and moisture and matched or outperformed common packaging plastics in tests at 80% humidity. - The materials used are reported as renewable, biodegradable and compostable, and several patent applications have been filed. - Remaining challenges include limited current supply of purified chitin and the multi-year task of scaling lab methods to industrial roll-to-roll production. Summary: These developments describe a path from an unexpected lab finding to a bio-based film that aims to provide oxygen and moisture barriers comparable to conventional packaging. The research team is pursuing patents and working with industry partners while scaling and supply chain limitations remain active considerations.