Significantly enhancing SERS sensitivity to distinguish pesticide concentrations at ppm levels in juices through inherent and added internal standards

IF 5.5 3区 工程技术 Q1 ENGINEERING, CHEMICAL
Chih-Yi Liu , Jhih-Yan Guo , Jin-Yi Lin , Sarat Aeimwiratchai , Kasimayan Uma , Wen-Yu Li , Jhe-Ruei Lin , Shun-Wei Liu
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引用次数: 0

Abstract

Background

Surface-enhanced Raman scattering (SERS) aids in pesticide detection, including thiram. The U.S. Environmental Protection Agency has set a 7 ppm residue standard specifically for thiram. Nonetheless, conventional SERS methods often lack sensitivity at ppm levels. We introduce internal standards to overcome this limitation.

Methods

Initially, we assessed thiram concentrations in apple and orange juices using the SERS peak at 1383 cm-1, denoted by its intensity as S1383. However, S1383 alone lacked sensitivity to ppm level variation. Apple juice exhibited a SERS peak at 732 cm-1 (intensity denoted as S732), serving as an inherent internal standard. The ratio of S1383 to S732 could differentiate thiram concentrations by ∼1 ppm within the range of 1 × 10-5 to 3 × 10-5 M. Pure orange juice lacked a discernible SERS peak, necessitating an added internal standard. Adenine, with SERS intensity at 731 cm-1 (S731) and 1322 cm-1 (S1322), was employed for this purpose. The combined use of S1383 and the ratios of S1383 to S731 and S1383 to S1322 could distinguish thiram concentration differences by ∼1 ppm within the range of 1 × 10-5 to 5 × 10-5 M.

Significant findings

Our approach facilitates exceptional differentiation at the ppm level, enhancing pesticide detection for improved food safety and environmental health.

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来源期刊
CiteScore
9.10
自引率
14.00%
发文量
362
审稿时长
35 days
期刊介绍: Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.
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