Smartphone-assisted dual-mode portable sensor for highly sensitive detection of ochratoxin A in foods

作者：Yan Zhang, Xiaohua He, Nan Liu, Danni Peng, Jian Xiao, Duoxia Xu, Nan Yang · 发表于：Talanta · 年份：2025 · DOI：10.1016/j.talanta.2025.129220 · 被引用次数：2 · 研究领域：Advanced biosensing and bioanalysis techniques、Mycotoxins in Agriculture and Food、Biosensors and Analytical Detection

Ochratoxin A (OTA), a highly toxic mycotoxin that widely contaminates cereal foods, not only poses a serious threat to human health but also endangers the safety of livestock through accumulation in the food chain. To address this concern, we developed a novel portable paper-based dual-mode sensing platform utilizing BSA-coated gold nanoclusters (BSA@AuNCs) for the sensitive detection of OTA. This innovative strategy synergistically integrates electrochemical immunosensing with paper-based fluorescence sensing, enabling collaborative detection and cross-validation of signals via two independent yet complementary mechanisms. In the electrochemical mode, a uniform BSA@AuNCs nanocomposite layer was deposited on a carbon paper substrate, followed by the immobilization of anti-OTA antibodies via EDC/NHS chemistry. This configuration achieved a wide linear detection range from 0.002 to 200 ng mL −1 and an ultra-low detection limit of 0.8 pg mL −1 . The high accuracy and reliability of the electrochemical method were further validated by the elliptical joint confidence region test. Simultaneously, the fluorescence mode combines the inherent fluorescence of BSA@AuNCs with smartphone imaging technology to achieve a linear range of 0.01–50 ng mL −1 and a detection limit of 2 pg mL −1 . This mode allows for visual and semi-quantitative detection, making it ideally suited for rapid on-site screening. The developed dual-mode platform demonstrates high sensitivity, robustness, and practica...