Visual detection of ciprofloxacin using a multi-emission ratiometric fluorescence sensor based on the molecularly imprinted polymers doped with terbium(III) ions

Xinming Zhao; Jialuo Yu; Dong Lin; Limei Han; Bowei Li; Jiadong Chen; Yixuan Wu; Yan Huang; Lingxin Chen; Xiaoyan Wang

doi:10.1016/j.talanta.2025.127537

Visual detection of ciprofloxacin using a multi-emission ratiometric fluorescence sensor based on the molecularly imprinted polymers doped with terbium(III) ions

Talanta. 2025 Jan 4:286:127537. doi: 10.1016/j.talanta.2025.127537. Online ahead of print.

Authors

Xinming Zhao¹, Jialuo Yu², Dong Lin¹, Limei Han¹, Bowei Li², Jiadong Chen², Yixuan Wu², Yan Huang¹, Lingxin Chen³, Xiaoyan Wang⁴

Affiliations

¹ School of Pharmacy, Binzhou Medical University, Yantai, 264003, China.
² CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Research Centre for Coastal Environmental Engineering and Technology, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China.
³ School of Pharmacy, Binzhou Medical University, Yantai, 264003, China; CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Shandong Key Laboratory of Coastal Environmental Processes, Research Centre for Coastal Environmental Engineering and Technology, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China. Electronic address: lxchen@yic.ac.cn.
⁴ School of Pharmacy, Binzhou Medical University, Yantai, 264003, China. Electronic address: wangxy@yic.ac.cn.

PMID: 39765082
DOI: 10.1016/j.talanta.2025.127537

Abstract

Ciprofloxacin (CIP) is a commonly used antibiotic, but its abuse may cause bacterial resistance, posing a high risk to the environment and human health. Herein, based on the molecular imprinting technology, this study proposed a ratiometric fluorescence sensor employing the "post-doping" strategy, which aims to be rapid, selective, and visually easy-to-use for CIP detection to address antibiotic residues and environmental risks. Specifically, by exploiting the "antenna effect" of lanthanide metal ions (Ln³⁺), terbium (III) (Tb³⁺) chosen as a fluorescence-assisted functional monomer as well as the red emitting CdTe quantum dots (QDs) as the internal reference signal were introduced into multi-emission Tb³⁺-CdTe@SiO₂@MIPs (TbMIPs). With the increase of CIP concentration, the variations among the fluorescence peaks within a multi-emission ratiometric fluorescence sensor not only induce a broader range of color changes, but also produce a more sensitive and stable effect through self-internal standard correction. The sensor showed a good trend in a wide concentration range within 0.08-50 μM and provided a satisfactory detection limit of 0.018 μM, which had lower detection limit for CIP than most of methods. It had demonstrated exceptional selectivity and had been successfully used to efficiently detect CIP in real samples including seawater, river water, milk and urine. Furthermore, when integrated with smartphone-based data processing capabilities, this sensor enabled highly sensitive visual detection under the 365 nm UV lamp device. Through innovative development, the wide color transition observed with the sensor makes it highly suitable for practical applications, enhancing its usability for further real-time monitoring.

Keywords: Ciprofloxacin; Molecularly imprinted polymers; Ratiometric fluorescence; Terbium (III); Visual detection.