Cellulose Nanofibers Prepared Using the TEMPO/Laccase/O2 System

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• 作者：Jie Jiang ; Wenbo Ye ; Liang Liu ; Zhiguo Wang ; Yimin FanTsuguyuki Saito ; Akira Isogai
• 刊名：Biomacromolecules
• 出版年：2017
• 出版时间：January 9, 2017
• 年：2017
• 卷：18
• 期：1
• 页码：288-294
• 全文大小：516K
• ISSN：1526-4602

文摘

The 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)/laccase/O<sub>2sub> system was used to prepare cellulose nanofibers from wood cellulose without requiring any chlorine-containing oxidant. Laccase was degraded by oxidized TEMPO (TEMPO<sup>+sup>) formed by laccase-mediated oxidation with O<sub>2sub>, which competed with the oxidation of wood cellulose. Thus, large amounts of laccase and TEMPO and a long reaction time were needed to introduce ∼0.6 mmol g<sup>–1sup> of C6-carboxylate groups onto wood cellulose. The TEMPO/laccase/O<sub>2sub> system underwent one-way reaction from TEMPO to reduced TEMPO through TEMPO<sup>+sup>. When the oxidation was applied again to the oxidized wood cellulose following isolation and purification, the C6-carboxylate groups increased to ∼1.1 mmol g<sup>–1sup>, which was sufficient to convert the sample to cellulose nanofibers by sonication in water. However, the higher the carboxylate content of the oxidized celluloses, the lower their degree of polymerization.