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Electrochemical Biosensing of Chilled Seafood Freshness by Xanthine Oxidase Immobilized on Copper-Based Metal–Organic Framework Nanofiber Film

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Abstract

ATP degradation is an important biochemical change during decomposition of seafood. Hypoxanthine and xanthine which are formed during ATP degradation process can be used for evaluation of chilled seafood freshness. Present study successfully immobilized xanthine oxidase (XOD) onto a type of biocompatible copper-based metal organic framework nanofibers (Cu-MOF) film and used it for fabrication of a hypoxanthine and xanthine electrochemical biosensor. Cu-MOF can efficiently entrap XOD, provide a suitable atmosphere for XOD biocatalysis, and ensure good electron transfer between enzyme and electrode surface. The as-prepared XOD-electrochemical biosensor demonstrated high sensitivity for both hypoxanthine and xanthine with a wide linear range (0.01 to 10 μM) and low limit of detection. During the 3-week storage stability test at 4 °C, the fabricated biosensor demonstrated good reusability (up to 100 times) and excellent storage stability for hypoxanthine and xanthine. When applied for detection of hypoxanthine and xanthine in chilled squid and large yellow croaker, the XOD-electrochemical biosensors demonstrated good recovery rates.

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Acknowledgments

Yongfa Cheng is acknowledged for his assistance in language editing particularly regarding the construction of the biosensor.

Funding

This study was sponsored by K.C. Wong Magna Fund in Ningbo University. Ling-Zhi Cheong acknowledged the funding support from Ningbo University (421401560) and the National Natural Science Foundation of China (21706137).

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Correspondence to Ling-Zhi Cheong.

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Zhipan Wang declares that he has no conflict of interest. Baokai Ma declares that he has no conflict of interest. Cai Shen declares that he has no conflict of interest. Oi-Ming Lai that she has no conflict of interest. Chin-Ping Tan declares that he has no conflict of interest. Ling-Zhi Cheong declares that he has no conflict of interest.

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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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Wang, Z., Ma, B., Shen, C. et al. Electrochemical Biosensing of Chilled Seafood Freshness by Xanthine Oxidase Immobilized on Copper-Based Metal–Organic Framework Nanofiber Film. Food Anal. Methods 12, 1715–1724 (2019). https://doi.org/10.1007/s12161-019-01513-8

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  • DOI: https://doi.org/10.1007/s12161-019-01513-8

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