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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants
Published on: February 19, 2016
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A disordered silver nanowires membrane for extraction and surface-enhanced Raman spectroscopy detection
1Key Laboratory for Colloid & Interface Chemistry of Ministry of Education, Department of Chemistry, Shandong University, Jinan Shandong 250100, P. R. China. jhzhan@sdu.edu.cn.
The Analyst
|March 27, 2014
Summary
A novel silver nanowire membrane rapidly collects and detects food contaminants using solid-phase extraction (SPE) and surface-enhanced Raman spectroscopy (SERS). This SERS-active membrane simplifies analysis by eliminating elution, ensuring food safety.
Area of Science:
- Materials Science
- Analytical Chemistry
- Food Science
Background:
- Food safety relies on rapid and accurate detection of contaminants.
- Traditional methods for contaminant analysis can be time-consuming and complex.
- Developing integrated extraction and detection systems is crucial for efficient food safety monitoring.
Purpose of the Study:
- To develop a novel silver nanowire membrane for simultaneous solid-phase extraction (SPE) and surface-enhanced Raman spectroscopy (SERS) detection of food contaminants.
- To evaluate the efficiency, stability, and applicability of the SERS-active membrane for rapid food contaminant analysis.
- To demonstrate the potential of this integrated approach for qualitative and quantitative detection of specific contaminants like phorate and melamine.
Main Methods:
- Fabrication of a disordered silver nanowires membrane via filtration of a silver nanowire colloid solution prepared by a solvothermal polyol process.
- Utilizing the membrane for rapid (less than 10 s) analyte concentration from liquid samples.
- Performing qualitative and quantitative analysis of phorate and melamine using a flow-through method with SERS detection.
- Assessing membrane uniformity and temporal stability under laser irradiation.
Main Results:
- The silver nanowire membrane effectively concentrated analytes from 5 mL of liquid phase in under 10 seconds.
- The integrated SPE-SERS approach eliminated the need for an elution step, significantly shortening analysis time.
- The membrane exhibited good uniformity and high temporal stability during continuous laser irradiation.
- A good linear relationship was observed between SERS intensity and the concentrations of phorate (2.5–10 μg mL⁻¹) and melamine (2.5–100 μg mL⁻¹).
Conclusions:
- The developed silver nanowire membrane serves as an efficient SERS-active material for rapid food contaminant analysis.
- The integrated SPE-SERS system offers a simplified and time-saving alternative to conventional methods for food safety testing.
- This technology shows promise for the sensitive and quantitative detection of various food contaminants, enhancing overall food safety protocols.
