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Chitin and Chitosan Nanofibers: Preparation and Chemical Modifications

Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori 680-8550, Japan
Molecules 2014, 19(11), 18367-18380; https://doi.org/10.3390/molecules191118367
Received: 18 September 2014 / Revised: 15 October 2014 / Accepted: 4 November 2014 / Published: 11 November 2014
(This article belongs to the Special Issue New Trends in Cellulose and Chitin Chemistry)
Chitin nanofibers are prepared from the exoskeletons of crabs and prawns, squid pens and mushrooms by a simple mechanical treatment after a series of purification steps. The nanofibers have fine nanofiber networks with a uniform width of approximately 10 nm. The method used for chitin-nanofiber isolation is also successfully applied to the cell walls of mushrooms. Commercial chitin and chitosan powders are also easily converted into nanofibers by mechanical treatment, since these powders consist of nanofiber aggregates. Grinders and high-pressure waterjet systems are effective for disintegrating chitin into nanofibers. Acidic conditions are the key factor to facilitate mechanical fibrillation. Surface modification is an effective way to change the surface property and to endow nanofiber surface with other properties. Several modifications to the chitin NF surface are achieved, including acetylation, deacetylation, phthaloylation, naphthaloylation, maleylation, chlorination, TEMPO-mediated oxidation, and graft polymerization. Those derivatives and their properties are characterized. View Full-Text
Keywords: chitin; chitosan; nanofiber; chemical modification chitin; chitosan; nanofiber; chemical modification
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Ifuku, S. Chitin and Chitosan Nanofibers: Preparation and Chemical Modifications. Molecules 2014, 19, 18367-18380.

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