Rapid and sensitive in-situ detection of pesticide residues in real tea soup with optical fiber SERS probes

• 全文链接

光纤SERS探针快速灵敏地原位检测真茶汤中的农药残留

关键词：

来源：

Journal of Food Composition and Analysis

全文链接：

//agri.nais.net.cn/topic/downloadFile/43601ae8-1f7a-4ee2-bbe0-e1d1475209e2

来源地址：

https://www.sciencedirect.com/science/article/pii/S0889157524005544

资源所属：

茶学研究专题

类型：

学术文献

语种：

英语

原文发布日期：

2024-10-20

摘要：

The detection of pesticide residues in tea soup is an important issue in food safety. Surface-enhanced Raman scattering (SERS) spectroscopy has significant application prospects for rapid and highly sensitive detection of pesticide residues in tea, but it usually requires complex sample pre-treatment processes, and it is still a challenge to achieve highly sensitive detection of pesticide residues in complex liquid-phase system as tea soup. This article demonstrates a novel in-situ SERS detection of tea soup utilizing high-performance fiber SERS probes. Au-nanorod (AuNR) cluster-patterned fiber SERS probes are successfully prepared with a laboratory-developed laser-induced evaporation self-assembly method (LIESAM), and then the in-situ SERS detection is performed by simply immersing the fiber SERS probes into tea soup. It is demonstrated that due to the lots of SERS hotspots provided by AuNR clusters on fiber facet and the integrated collection of SERS signal in fiber SERS probes, the detection limits as low as 1.0 μg/kg for thiram and 10.0 μg/kg for paraquat in tea soup are achieved; and the relative standard deviations (RSDs) of the peak intensities are less than 10 %. The recovery rate experiments indicted the good detection accuracy of this in-situ SERS detection method in tea soup. Since no additional sample extraction is required, and the preparation of fiber SERS probes is simple and highly automated, this work provides a rapid method for highly sensitive detection of pesticide residues in tea soups, which can find important practical applications in the field of various liquid food.