Label-free SERS strategy for rapid detection of capsaicin for identification of waste oils

Sheng-Hong Liu; Xiu-Mei Lin; Zhi-Lan Yang; Bao-Ying Wen; Fan-Li Zhang; Yue-Jiao Zhang; Jian-Feng Li

doi:10.1016/j.talanta.2022.123488

Label-free SERS strategy for rapid detection of capsaicin for identification of waste oils

Talanta. 2022 Aug 1:245:123488. doi: 10.1016/j.talanta.2022.123488. Epub 2022 Apr 18.

Authors

Sheng-Hong Liu¹, Xiu-Mei Lin², Zhi-Lan Yang¹, Bao-Ying Wen¹, Fan-Li Zhang³, Yue-Jiao Zhang⁴, Jian-Feng Li⁵

Affiliations

¹ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, College of Energy, Xiamen University, Xiamen, 361005, China.
² Department of Chemistry and Environment Science, Fujian Province University Key Laboratory of Analytical Science, Minnan Normal University, Zhangzhou, 363000, China.
³ College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China. Electronic address: zhangli_fan@126.com.
⁴ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, College of Energy, Xiamen University, Xiamen, 361005, China; Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China. Electronic address: zhangyuejiao@xmu.edu.cn.
⁵ State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, College of Energy, Xiamen University, Xiamen, 361005, China; Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen, 361005, China. Electronic address: li@xmu.edu.cn.

PMID: 35453096
DOI: 10.1016/j.talanta.2022.123488

Abstract

Identification of waste oils is challenging in the field of food safety due to the lack of common markers and straightforward analytical methods. Herein, we developed a novel label-free surface-enhanced Raman spectroscopy (SERS) strategy to identify waste oils using Ag nanoparticles solution (Ag NPs sol.) as a SERS substrate to significantly enhance the Raman signal of capsaicin marker molecule usually contained in the waste oils. The enhanced signal was directly detected by a portable Raman spectrometer with the limit of detection (LOD) of 2.9 μg L^-1 within 10 min. Concentration-dependent SERS investigation showed the linear relationship between the SERS signal intensity of the characteristic peaks and the concentrations of capsaicin in the range of 10-2500 μg L^-1 and the correlation coefficient was 0.9895. Our findings show the sensitivity, accessibility, and reliability of this method for the rapid identification of waste oils and furthermore for the practical applications in the field of food safety.

Keywords: Capsaicin; Detection; Quantitative; SERS; Waste oils.

MeSH terms

Capsaicin
Metal Nanoparticles* / chemistry
Plant Oils
Reproducibility of Results
Silver* / chemistry
Spectrum Analysis, Raman / methods

Substances

Plant Oils
Silver
Capsaicin