High-Strength Nanostructured Film Based on beta-Chitin Nanofibrils from Squid Illex argentinus Pens by 2,2,6,6-Tetramethylpiperidin-1-yl Oxyl-Mediated Reaction


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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Wu, Qiong; Engstrom, Joakim; Li, Lengwan; Sehaqui, Houssine; Mushi, Ngesa E.; Berglund, Lars A.

Publication year: 2021

Journal: ACS Sustainable Chemistry and Engineering (2168-0485)

Volume number: 9

Issue number: 15

Start page: 5356

End page: 5363

Number of pages: 8

ISSN: 2168-0485

Languages: English (EN-GB)


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Abstract

2,2,6,6-Tetramethylpiperidin-1-yl oxyl (TEMPO)-oxidized beta-chitin nanofibrils (T-ChNF) are novel nanofibrils of high strength and stiffness and can also enhance the adsorption of chitosan in materials for biomedical applications. This study presents the preparation, structure, and properties of T-ChNF based on squid pens. Our nanofibrils have a zeta potential of -25.3 mV at neutral pH and a carboxylic content of 0.17 mmol/g, making hydrocolloid suspension stable at alkaline and neutral pH. It was demonstrated that positively charged chitosan could be adsorbed on the negatively charged surface of T-ChNF, leading to charge neutralization. The key to strong squid pen T-ChNF is the initial raw squid chitin properties and the high degree of acetylation (DA = 99.9%). The T-ChNF diameter is similar to 4.4 nm, and the length is in the micrometer range. The length and diameter are similar to those of squid pen beta-chitin fibrils prepared under mild conditions. These qualities of fibrils resulted in high-strength (176 MPa) chitin films prepared using the rapid vacuum filtration and drying technique. T-ChNF-based films are ductile, flexible, and transparent.


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Last updated on 2021-19-11 at 23:16