Fabrication of flexible SERS substrate based on Au nanostars and PDMS for sensitive detection of Thiram residue in apple juice

Yusheng Zhang; Yong Wang; Anran Liu; Songqin Liu

doi:10.1016/j.saa.2023.122721

Fabrication of flexible SERS substrate based on Au nanostars and PDMS for sensitive detection of Thiram residue in apple juice

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Sep 5:297:122721. doi: 10.1016/j.saa.2023.122721. Epub 2023 Apr 8.

Authors

Yusheng Zhang¹, Yong Wang², Anran Liu³, Songqin Liu¹

Affiliations

¹ Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device (CMD), Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China.
² Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device (CMD), Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China; Institute of Forensic Science and Technology of Nanjing Public Security Bureau, Nanjing 210012, PR China.
³ Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device (CMD), Jiangsu Province Hi-Tech Key Laboratory for Bio-medical Research, School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, PR China. Electronic address: liuar@seu.edu.cn.

PMID: 37054572
DOI: 10.1016/j.saa.2023.122721

Abstract

We developed a novel fabrication of flexible surface-enhanced Raman scattering (SERS) substrate to perform selective and sensitive determination of thiram residue in fruits and juices. Au nanostars (Au NSs) with multi-branching structure were self-assembled on aminated Polydimethylsiloxane (PDMS) slides by electrostatic interaction. By measuring the Thiram's characteristic peak intensity at 1371 cm^-1, the SERS method could distinguish Thiram from other pesticide residues. A good linear relationship between the peak intensity at 1371 cm^-1 and thiram's concentration was established at the range from 0.01 ppm to 100 ppm and the Limit of detection is 0.0048 ppm. We directly used this SERS substrate to detect Thiram in apple juice. By standard addition method, recoveries varied in the range of 97.05% to 106.00% and the RSD were from 3.26% to 9.35%. The SERS substrate exhibited a good sensitivity, stability and selectively for the detection of Thiram in food samples, which can be spread as a common method for the detection of pesticides in food samples.

Keywords: Au NSs; PDMS; Pesticide residues; SERS; Thiram.

MeSH terms

Dimethylpolysiloxanes
Fruit / chemistry
Gold / chemistry
Malus* / chemistry
Metal Nanoparticles* / chemistry
Pesticides* / analysis
Spectrum Analysis, Raman / methods
Thiram / analysis

Substances

Thiram
Pesticides
baysilon
Dimethylpolysiloxanes
Gold