DNAzyme-Amplified Electrochemical Biosensor Coupled with pH Meter for Ca2+ Determination at Variable pH Environments

文献类型： 外文期刊

第一作者： Wang, Hui

作者： Wang, Hui;Zhang, Fan;Wang, Yue;Luo, Qingyao;Zheng, Shanshan;Yang, Liang;Tang, Xiangfang;Xiong, Benhai;Zhang, Fan;Wang, Yue;Shi, Fangquan;Chen, Junhong;Dai, Dingzhen

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关键词： electrochemical sensor; single-walled carbon nanotube; DNAzyme; dairy cow; hypocalcemia

期刊名称：NANOMATERIALS （ 影响因子：5.719； 五年影响因子：5.81 ）

ISSN：

年卷期： 2022 年 12 卷 1 期

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收录情况： SCI

摘要： For more than 50% of multiparous cows, it is difficult to adapt to the sudden increase in calcium demand for milk production, which is highly likely to cause hypocalcemia. An electrochemical biosensor is a portable and efficient method to sense Ca2+ concentrations, but biomaterial is easily affected by the pH of the analyte solution. Here, an electrochemical biosensor was fabricated using a glassy carbon electrode (GCE) and single-walled carbon nanotube (SWNT), which amplified the impedance signal by changing the structure and length of the DNAzyme. Aiming at the interference of the pH, the electrochemical biosensor (GCE/SWNT/DNAzyme) was coupled with a pH meter to form an electrochemical device. It was used to collect data at different Ca2+ concentrations and pH values, and then was processed using different mathematical models, of which GPR showed higher detecting accuracy. After optimizing the detecting parameters, the electrochemical device could determine the Ca2+ concentration ranging from 5 mu M to 25 mM, with a detection limit of 4.2 mu M at pH values ranging from 4.0 to 7.5. Finally, the electrochemical device was used to determine the Ca2+ concentrations in different blood and milk samples, which can overcome the influence of the pH.

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