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Chitin-glucan complex - Based biopolymeric structures using biocompatible ionic liquids.

Inês C Ferreira¹, Diana Araújo², Pierre Voisin³

¹LAQV-REQUIMTE, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal; UCIBIO-REQUIMTE, Chemistry Department, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.

Carbohydrate Polymers

|August 25, 2020

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This summary is machine-generated.

Ionic liquids dissolve fungal chitin-glucan complex (CGC) into distinct chitosan-glucan complexes (ChGC). The ionic liquid

Area of Science:

Biopolymer chemistry
Green chemistry
Materials science

Background:

Chitin-glucan complex (CGC) is a fungal co-polymer with potential applications.
Dissolving CGC using environmentally friendly methods is crucial for its utilization.
Ionic liquids (ILs) offer a promising avenue for biopolymer processing.

Purpose of the Study:

To investigate the dissolution of fungal CGC using biocompatible ionic liquids.
To characterize the resulting polymeric structures and their properties.
To explore the chemical modifications of CGC during IL-mediated dissolution.

Main Methods:

Dissolution of Komagataella pastoris (CGCp) and Aspergillus niger (CGCkz) derived CGC using three cholinium-based ionic liquids (choline acetate, propionate, hexanoate) at 5% (w/w).

Keywords:

Biopolymers Chitin-glucan complex (CGC)Films Gels Ionic liquids (ILs)

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Characterization of the obtained polymeric structures (films and gels) and their physical properties (e.g., swelling capacity, elongation at break).

Analysis of chemical structure changes using techniques to assess glucan moiety reduction and degree of acetylation.

Main Results:

All tested ILs dissolved CGC, yielding distinct structures: dense, elastic films from CGCp and weak gels from CGCkz.
IL anion alkyl chain length influenced CGCp film properties like elongation and swelling.
Dissolution led to significant chemical changes, reducing the glucan moiety and acetylation degree, forming chitosan-glucan complexes (ChGC) enriched in glucosamine (53.4–60.8%).

Conclusions:

Biocompatible ionic liquids can effectively dissolve fungal CGC, producing unique chitosan-glucan complexes (ChGC).
The properties of the resulting ChGC are dependent on the fungal source and the IL used.
This study demonstrates a novel green approach for modifying and processing fungal co-polymers for potential applications.