Chitin nanocrystals prepared by TEMPO-mediated oxidation of alpha-chitin.
作者： Yimin Fan , Tsuguyuki Saito , Akira Isogai
DOI: 10.1021/BM700966G
关键词: Nanocrystal 、 Nanoparticle 、 Carboxylate 、 Crystallite 、 Stereochemistry 、 Chemical modification 、 Nitroxyl 、 Nuclear chemistry 、 Crystallinity 、 Chemistry 、 Chitin
摘要: Chitin nanocrystals dispersed in water were successfully prepared by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) mediated oxidation of alpha-chitin at pH 10 under specific conditions, followed ultrasonic treatment. When the amount NaClO added as co-oxidant was 5.0 mmol/g chitin, weight percentage water-insoluble fraction TEMPO-oxidized chitin 90%, and its carboxylate content reached 0.48 mmol/g. Since thus had a crystallinity high that original alpha-chitin, C6 groups formed TEMPO-mediated can be regarded being present only on crystallite surfaces. No N-deacetylation occurred chitins. subjected to treatment water, mostly individualized obtained, average nanocrystal length width 340 8 nm, respectively.
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