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Fungal and Microalgal Chitin: Structural Differences, Functional Properties, and Biomedical Applications
Lijing Yin1,2, Hang Li1,2, Ronge Xing1,3
1Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266000, China.
Polymers
|October 28, 2025
Summary
Fungal and microalgal chitin offer sustainable alternatives to crustacean-derived chitin. These sources provide unique structural polymorphs and tunable properties for diverse applications, utilizing eco-friendly extraction methods.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Sustainable Materials
Background:
- Chitin, a prevalent natural polysaccharide, is valuable in biomedicine, agriculture, and materials science.
- Conventional chitin extraction from crustaceans has environmental and purity drawbacks.
- Fungal and microalgal chitin present sustainable and versatile alternatives.
Purpose of the Study:
- To explore fungal and microalgal chitin as alternatives to crustacean chitin.
- To highlight the unique structural and chemical properties of alternative chitin sources.
- To review advancements in green extraction technologies for chitin recovery.
Main Methods:
- Review of current literature on chitin sources and extraction.
- Analysis of structural characteristics (polymorphs, morphology) of fungal and microalgal chitin.
- Evaluation of green extraction techniques (enzymatic, ionic liquids, deep eutectic solvents).
Main Results:
- Fungal chitin (α-polymorph) exhibits high crystallinity and mechanical stability due to its matrix.
- Microalgal chitin (β-polymorph), especially from diatoms, forms high-aspect-ratio microrods/nanofibrils with enhanced reactivity.
- Green extraction methods preserve native chitin morphology and reduce environmental impact.
Conclusions:
- Fungal and microalgal chitin offer distinct structural advantages over crustacean chitin.
- Sustainable sourcing combined with green processing yields high-quality chitin for advanced applications.
- These alternative chitin sources are promising for developing novel biomaterials and functional materials.
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