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Synthesis of fluorescent probes based on cellulose for Fe2+ recognition

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Abstract

As the plentiful and easily accessible natural polymer, cellulose is insoluble in most organic solvents. Improving the solubility of cellulose is necessary. In this work, cellulose-based fluorescent probes were prepared by chemical modification, and they could be dissolved in organic-water mixed solvent. The obtained cellulose based fluorescent probes could selectively recognize Fe2+ in H2O/DMSO (1:2, v/v) or H2O/DMF (1:2, v/v) system. Firstly, through the esterification reaction between −OH on cellulose and acryloyl chloride, cellulose derivatives with −C = C were prepared. Secondly, via thiol-ene click reaction between −C = C on cellulose and −SH on cysteamine, −NH2 groups at the chain ends are attached to cellulose. At the same time, three small molecular derivatives (N1, N2, N3) from 4-bromo-1,8-naphthalene anhydride were synthesized. Finally, the reaction between –NH2 on cellulose and –CO–O–CO– on 4-bromo-1,8-naphthalene anhydride derivatives occurred readily. By this method, three cellulose-based fluorescent probes (CN1, CN2, CN3) were prepared successfully. These as-prepared fluorescent probes could be easily dissolved in H2O/DMSO or H2O/DMF mixed solvents. Fluorescence detection measurements indicate that the probes could selectively detect Fe2+. The fluorescence is quenched after the probes contacting with Fe2+, which are turn-off fluorescent probes. In addition, the prepared probes could be fabricated into cellulose membrane by a simple method for portable detection of Fe2+. The prepared cellulose-based fluorescent probes could be used as macromolecular sensors for Fe2+ detection, and could be processed into cellulose-friendly materials, which are expected to be used in environmental systems.

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The authors declare all the data and materials were available.

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Acknowledgments

We are grateful to thank the financial support of National Natural Science Foundation of China (NSFC, No. 41573106).

Funding

National Natural Science Foundation of China (NSFC, No. 41573106).

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LY and XC designed the synthesis routes. LY performed the experiment, wrote the draft. XC revised the manuscript.

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Correspondence to Xinjian Cheng.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The manuscript was approved by all authors and Wuhan Institute of Technology for publication.

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Yun, L., Cheng, X. Synthesis of fluorescent probes based on cellulose for Fe2+ recognition. Cellulose 30, 933–951 (2023). https://doi.org/10.1007/s10570-022-04930-x

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  • DOI: https://doi.org/10.1007/s10570-022-04930-x

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