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Using TEMPO oxidation to tailor deacetylation of carboxyl β-chitin nanofibers from squid pen

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Abstract

2,2,6,6-tetramethylpiperidine-1-oxyl-radical (TEMPO) oxidation is a classical method to obtain carboxyl chitin nanomaterials, but when the traditional TEMPO/NaBr/NaClO (TBN) oxidation system was oxidizing β-chitin, it was only suitable for β-chitin with a degree of deacetylation (DD) of 1%. Herein, the high yield carboxyl β-chitin nanofibers (CO-ChNFs) were successfully prepared from squid pen β-chitin with partially deacetylated (DD: 5–30%) using the TEMPO/NaClO/NaClO2 (TNN) oxidation system. The results show that the DD of purified β-chitin has a great impact on the yield of CO-ChNFs, and the yield is as high as 98% when the DD of β-chitin was 11%. XRD results showed that β-chitin undergoes slight of β–α transformation after TNN TEMPO oxidation, and the 010 crystal planes are arranged more closely. AFM characterization suggests that thus prepared CO-ChNFs have a diameter of 2–6 nm and a length in the micrometer range. The proposed preparation method breaks through the previous limitation of TEMPO oxidation for β-chitin, and will facilitate the in-depth research and application of carboxyl β-chitin nanofibers.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Numbers 51573082 and 21774068), and State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) (K2019-09).

Funding

Funding was provided by the National Natural Science Foundation of China (Grant Numbers 51573082 and 21774068).

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Conceptualization: [DL]; Methodology: [DL]; Investigation : [DL], [SH], [HW]; Data curation: [DL]; Writing—original draft preparation: [DL]; Writing—review and editing: [JZ]; Supervision: [JZ]

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Correspondence to Jianming Zhang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Liu, D., Huang, S., Wu, H. et al. Using TEMPO oxidation to tailor deacetylation of carboxyl β-chitin nanofibers from squid pen. Cellulose 29, 8539–8549 (2022). https://doi.org/10.1007/s10570-022-04817-x

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  • DOI: https://doi.org/10.1007/s10570-022-04817-x

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