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Highly selective localized surface plasmon resonance sensor for selenium diagnosis in selenium-rich soybeans
Suyan Qiu1, Yifan Dong1, Xiren Yu1
1MARA Key Laboratory for Quality and Safety Control of Poultry Products, Institute for Quality & Safety and Standards of Agricultural Products Research, Jiangxi Academy of Agricultural Sciences, Nanchang, Jiangxi 330200, China.
Journal of Hazardous Materials
|August 25, 2024
Summary
A new localized surface plasmon resonance (LSPR) sensor detects selenium (Se(IV)) by monitoring gold nanorod etching in acidic solutions. This method offers a selective and efficient approach for environmental and agricultural selenium analysis.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Accurate selenium determination is crucial for environmental monitoring and agricultural soil analysis.
- Existing methods for detecting selenium ions (Se(IV)) in acidic aqueous environments face challenges in selectivity and sample preparation.
- Gold nanorods (AuNRs) offer potential for sensing applications due to their tunable optical properties.
Purpose of the Study:
- To develop a novel localized surface plasmon resonance (LSPR) sensor for sensitive and selective detection of Se(IV) ions.
- To utilize the unique etching behavior of AuNRs in response to varying Se(IV) concentrations.
- To enable direct selenium detection in acidic solutions, simplifying sample pretreatment for environmental and agricultural samples.
Main Methods:
- Development of an LSPR sensor based on the etching of gold nanorods (AuNRs).
- Monitoring the longitudinal plasmon band (LPB) shift of AuNRs as an indicator of Se(IV) concentration.
- Utilizing the red shift change (Δλ) of the LPB for quantitative analysis.
- Testing the sensor's performance in 0.1 mol/L HCl solution.
Main Results:
- The sensor exhibited selective Se(IV) detection based on the differential etching of AuNRs (lateral vs. tip etching).
- A high selectivity was achieved by quantifying the red shift change (Δλ) of the LPB.
- The sensor successfully operated in 0.1 mol/L HCl, facilitating direct analysis of complex samples.
- Demonstrated successful selenium detection in soybean samples from selenium-rich agriculture.
Conclusions:
- The developed LSPR sensor provides a highly selective and efficient method for Se(IV) ion detection.
- The sensor's ability to function in acidic media simplifies sample preparation for environmental and agricultural applications.
- This approach offers a promising tool for monitoring selenium levels in complex environmental and crop samples.
