Development of a new molecularly imprinted spr sensor for fenpicoxamide detection

This research attempt involved the development and utilization of a newly designed surface plasmon resonance (SPR) sensor which incorporated sulfur-doped graphitic carbon nitride (S- g-C3N4) as the molecular imprinting material. The objective of the study was to employ this sensor for the quantitative analysis of Fenpicoxamid (FEN) in rice samples. The synthesis of S-g-C3N4 was achieved using the thermal polycondensation approach, which adheres to the principles of green chemistry. Afterwards, UV polymerization was utilized to fabricate a surface plasmon resonance (SPR) chip imprinted with FEN, employing S-g-C3N4 as the substrate material. This process involved the inclusion of N,N′-azobisisobutyronitrile (AIBN) as the initiator, ethylene glycol dimethacrylate (EGDMA) as the cross-linker, methacryloylamidoglutamic acid (MAGA) as the monomer, and FEN as the analyte. After successful structural analysis investigations on a surface plasmon resonance (SPR) chip utilizing S-g-C3N4, which was imprinted with FEN, a compre- hensive investigation was conducted using spectroscopic, microscopic, and electrochemical techniques. The kinetic analysis applications, namely the determination of the limit of quantification (LOQ) and the limit of detection (LOD), were carried out. For analytical results, the linearity of the FEN-imprinted SPR chip based on S-g-C3N4 was determined as 1.0–10.0 ng L−1 FEN, and LOQ and LOD values were obtained as 1.0 ng L−1 and 0.30 ng L−1, respectively. Finally, the prepared SPR sensor's high selectivity, repeatability, reproducibility, and stability will help to ensure safe food consumption worldwide. Keywords: fenpicoxamid; surface plasmon resonance; molecularly imprinting; food analysis