Fe-MOF/AuNP-based ratiometric electrochemical immunosensor for the detection of deoxynivalenol in grain products

• Published in: Mikrochimica acta (1966) Vol. 191; no. 4; p. 210
• Main Authors: Shu, Zaixi, Hu, Huilin, Yuan, Zhenhong, Zou, Yue, Zhang, Qi, Wang, Yingli, Liu, Xin, Duan, Shuo, Pi, Fuwei, Wang, Jiahua, Liu, Xiaodan, Dai, Huang
• Format: Journal Article
• Language: English
• Published: Vienna Springer Vienna 01.04.2024; Springer; Springer Nature B.V
• Subjects: Analytical Chemistry; Cereal products; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Deoxynivalenol; Electric properties; Electrolytes; Gold; Immunosensors; Iron; Metal-organic frameworks; Microengineering; Nanochemistry; Nanocomposites; Nanotechnology; Original Paper; Reference signals; Fe-based metal–organic framework; Electrochemical immunosensor; Differential pulse voltammetry; Deoxynivalenol detection; Ratiometric
• ISSN: 0026-3672; 1436-5073; 1436-5073
• DOI: 10.1007/s00604-024-06281-9

A ratiometric assay was designed to improve the sensitivity and reliability of electrochemical immunosensors for deoxynivalenol (DON) detection. The indicator signal caused by the Fe-based metal–organic framework nanocomposites loaded with gold nanoparticles and the internal reference signal from the [Fe(CN) 6 ] 3−/4− in the electrolyte came together at the immunosensor. When immunoreactivity occurred, the indicator signals decreased as the concentration of DON increased, while the internal reference signals increased slightly. The ratio of the indicator signal to the internal reference signal was available for reproducible and sensitive monitoring of DON. The prepared immunosensor showed excellent performance in the range from 0.5 to 5000 pg mL −1 , and the detection limit was 0.0166 pg mL −1 . The immunosensor achieved satisfactory detection toward DON in spiked and actual samples and has a promising application in the control of DON in grain products. Graphical Abstract