Detection of Organophosphate Pesticides in Olive Oil with Metrohm Instant SERS Analyzer (Misa) скачать в хорошем качестве

Detection of Organophosphate Pesticides in Olive Oil with Metrohm Instant SERS Analyzer (Misa)

Presented at the 2021 AOCS Annual Meeting & Expo Industry Updates annualmeeting.aocs.org Presenting Author: Wei Yu, PhD Product Manager Metrohm Riverview, FL Organophosphate pesticides are widely used in olive cultivation for the control of insect pests. Due to the high solubility of these pesticides in oils and the minimal processing of virgin oils, these harmful chemicals may accumulate in the end product. Detection of pesticide residues typically require the use of analytical techniques such as GC-MS and HPLC, but technical complexity and cost requirements limits their usage to the confines of well-equipped laboratories. The Metrohm Instant SERS Analyzer (Misa) from Metrohm is a portable Raman spectrometer for performing Surface Enhanced Raman Scattering (SERS) measurements. SERS is an extension of Raman spectroscopy which allow detection and identification of analytes in concentrations as low as parts per billion. Misa was developed with the focus for a simple, rapid and green testing solution to address food safety threats. In this study, we demonstrate the use of Misa in detecting Fenthion in extra virgin olive oil (EVOO). Fenthion is an organophosphate that has been classified as a restricted-use insecticide by the US EPA. However, the use of this pesticide in olive orchards in Mediterranean countries results in EVOO that occasionally exceed the maximum residue limits (1mg/kg) established for virgin olive oil. Misa easily achieves sensitive trace detection of Fenthion in spiked EVOO after a simple organic solvent extraction in ~15 minutes. The assay is based on the acquisition of SERS-specific spectra for Fenthion in the extract using Misa with a gold colloid solution. Misa features simple one-touch operation and guided workflows for many common pesticides and contaminants in a variety of food matrices, making it a valuable tool for the rapid detection and identification of trace food contaminants.