A tailored dual core-shell magnetic SERS substrate with precise shell-thickness control for trace organophosphorus pesticides residues detection

Mingchun Lv; Hongbin Pu; Da-Wen Sun

doi:10.1016/j.saa.2024.124336

A tailored dual core-shell magnetic SERS substrate with precise shell-thickness control for trace organophosphorus pesticides residues detection

Spectrochim Acta A Mol Biomol Spectrosc. 2024 Aug 5:316:124336. doi: 10.1016/j.saa.2024.124336. Epub 2024 Apr 23.

Authors

Mingchun Lv¹, Hongbin Pu², Da-Wen Sun³

Affiliations

¹ School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
² School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China.
³ School of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou 510642, China; Academy of Contemporary Food Engineering, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain Foods, & Guangdong Province Engineering Laboratory for Intelligent Cold Chain Logistics Equipment for Agricultural Products, Guangzhou Higher Education Mega Centre, Guangzhou 510006, China; Food Refrigeration and Computerized Food Technology (FRCFT), Agriculture and Food Science Centre, University College Dublin, National University of Ireland, Belfield, Dublin 4, Ireland. Electronic address: dawen.sun@ucd.ie.

PMID: 38678838
DOI: 10.1016/j.saa.2024.124336

Abstract

For addressing the challenges of strong affinity SERS substrate to organophosphorus pesticides (OPs), herein, a rapid water-assisted layer-by-layer heteronuclear growth method was investigated to grow uniform UiO-66 shell with controllable thickness outside the magnetic core and provide abundant defect sites for OPs adsorption. By further assembling the tailored Au@Ag, a highly sensitive SERS substrate Fe₃O₄-COOH@UiO-66/Au@Ag (FCUAA) was synthesized with a SERS enhancement factor of 2.11 × 10⁷. The substrate's suitability for the actual vegetable samples (cowpeas and peppers) was confirmed under both destructive and non-destructive detection conditions, showing a strong SERS response to fenthion and triazophos, with limits of detection of 1.21 × 10^-5 and 2.96 × 10^-3 mg/kg in the vegetables under destructive conditions, and 0.13 and 1.39 ng/cm² for non-destructive detection, respectively. The FCUAA substrate had high SERS performance, effective adsorption capability for OPs, and demonstrated good applicability, thus exhibiting great potential for rapid detection of trace OPs residues in the food industry.

Keywords: Controllable thickness; Organophosphorus pesticides; SERS substrate Fe(3)O(4)-COOH@UiO-66/Au@Ag; Tailored Au@Ag; UiO-66 shell.

MeSH terms

Adsorption
Fenthion / analysis
Food Contamination / analysis
Gold / chemistry
Limit of Detection
Organophosphorus Compounds / analysis
Organophosphorus Compounds / chemistry
Organothiophosphates / analysis
Pesticide Residues* / analysis
Silver / chemistry
Spectrum Analysis, Raman* / methods
Triazoles / analysis
Triazoles / chemistry
Vegetables / chemistry

Substances

Pesticide Residues
triazophos
Gold
Organophosphorus Compounds
Silver
Fenthion
Triazoles
Organothiophosphates