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<p>This work presents use of agricultural waste-derived biochar as a functional substrate for MIP-based electrochemical sensing of ceftiofur sodium. Herein, carboxylated biochar derived from rice straw was deposited onto fluorine-doped tin oxide (FTO) electrode, followed by in situ electro-polymerization of a ceftiofur sodium-imprinted PEDOT layer on its surface, forming the MIP/COOH-biochar sensing interface. The optimized MIP sensor displayed a broad linear response range (1 ng mL<sup>− 1</sup> − 10<sup>5</sup> ng mL<sup>− 1</sup>), with a detection limit of 0.03 ng mL<sup>− 1</sup>. Moreover, the MIP sensor demonstrated selective recognition of ceftiofur sodium, with an imprinting factor of 4.23, excellent reproducibility (RSD &lt; 2.236%), and good sensitivity, as indicated by the slope of the calibration plot (<i>I</i><sub><i>pa</i></sub> vs. log C), which was 72.6 µA log<sup>− 1</sup>(ng mL<sup>− 1</sup>). Practical applicability was confirmed through spike-recovery studies and analysis of real milk samples. Among six commercial milk samples tested, ceftiofur sodium was detected in two samples, and the results were validated with the LC-MS technique, confirming the suitability of the constructed MIP sensor for real sample analysis.</p>

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Molecularly imprinted electrochemical sensor based on poly(3,4-ethylenedioxythiophene)/carboxylated biochar for ceftiofur estimation in milk

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月28日

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  • Surbhi Kumari,
  • Navjit Kaur,
  • Rishika Rohilla,
  • Nirmal Prabhakar

摘要

This work presents use of agricultural waste-derived biochar as a functional substrate for MIP-based electrochemical sensing of ceftiofur sodium. Herein, carboxylated biochar derived from rice straw was deposited onto fluorine-doped tin oxide (FTO) electrode, followed by in situ electro-polymerization of a ceftiofur sodium-imprinted PEDOT layer on its surface, forming the MIP/COOH-biochar sensing interface. The optimized MIP sensor displayed a broad linear response range (1 ng mL− 1 − 105 ng mL− 1), with a detection limit of 0.03 ng mL− 1. Moreover, the MIP sensor demonstrated selective recognition of ceftiofur sodium, with an imprinting factor of 4.23, excellent reproducibility (RSD < 2.236%), and good sensitivity, as indicated by the slope of the calibration plot (Ipa vs. log C), which was 72.6 µA log− 1(ng mL− 1). Practical applicability was confirmed through spike-recovery studies and analysis of real milk samples. Among six commercial milk samples tested, ceftiofur sodium was detected in two samples, and the results were validated with the LC-MS technique, confirming the suitability of the constructed MIP sensor for real sample analysis.