Journal
CARBOHYDRATE POLYMERS
Volume 77, Issue 4, Pages 832-838Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2009.03.008
Keywords
beta-Chitin; TEMPO; Crystallinity; Nanofibril; Tubeworm
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Funding
- Japan Society for the Promotion of Science (JSPS) [18380102, 18-10902]
- Grants-in-Aid for Scientific Research [18380102] Funding Source: KAKEN
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TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical)-mediated oxidation was applied to beta-chitins, originating from tubeworm and squid pen, to prepare chitin nanofibrils. Water-insoluble fractions of the TEMPO-oxidized beta-chitins were obtained in various ratios by controlling the addition level of NaClO used as the primary oxidant in the oxidation. The water-insoluble fractions of the TEMPO-oxidized tubeworm beta-chitins, when they had carboxylate groups of 0.18-0.25 mmol/g, were successfully converted to highly viscous and translucent gels by disintegration in water. The gels consisted of mostly individual nanofibrils 20-50 nm in width and at least several microns in length. On the other hand, the water-insoluble fractions of the TEMPO-oxidized squid pen beta-chitins could be transformed to neither transparent nor translucent dispersions under any oxidation or disintegration conditions used. When sufficient amounts of NaClO were used, both beta-chitins were completely oxidized to the corresponding water-soluble polyuronic acids by oxidation of all C6 primary hydroxyls to carboxylate groups. (C) 2009 Elsevier Ltd. All rights reserved.
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