Development, Validation, and Application of a Portable SPR Biosensor for the Direct Detection of Insecticide Residues

This Study was carried out to develop a small-sized biosensor based on Surface plasmon resonance (SPR) for the rapid identification of insecticide residues for food safety. The SPR biosensor module Consists of a single 770 rim-fight emitting diodes (LED) light source, several optical lenses for transferring light, a hemisphere sensor chip, photo detector, A/D converter, power Source, and software for signal processing using a computer. Except for the computer, the size and weight of the sensor module are 150 (L)x70 (W)x120 (H) mm and 828 g, respectively. Validation and application procedures were designed to assess refractive index analysis, affinity properties, sensitivity, linearity, limits of detection, and robustness which includes an analysis of baseline stability and reproducibility of ligand immobilization using carbamate (carbofuran and carbaryl) and organophosphate (cadusafos, ethoprofos, and chlorpyrifos) insecticide residues. With direct binding analysis, insecticide residues were detected at less than the minimum 0.01 ppm and analyzed in less than 100 sec with a good linear relationship. Based on these results, we find that the binding interaction with active target groups in enzymes using the miniaturized SPR biosensor could detect low concentrations which satisfy, the maximum residue limits for pesticide tolerance in Korea, Japan, and the USA.