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Mussel-inspired PDA-based MIP-SERS sensor for the detection of trace MG in environmental water
Xiang Zhang1, Longlong Luan2, Ying Huang1
1The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230001, China. weipingx@ustc.edu.cn.
Abstract:
The abuse of antibiotics such as malachite green (MG) has caused its residues in foods and environmental water, and therefore, it is important to establish a rapid and reliable method for sensitive detection of antibiotics. In this work, a novel molecularly imprinted polymer surface-enhanced Raman spectroscopy (SERS) sensor integrating high sensitivity, selectivity, and reusability is fabricated for the detection of trace MG in environmental water. SiO2@Au, by adjusting the gap between nanoparticles, provides SERS activity, and then the template MG is molecularly imprinted and wrapped by oxidative self-polymerization properties of dopamine (SA-100@MIP). The prepared SA-100@MIP achieved sensitive and selective detection of MG in pond water (0.1 nM) and presented a good linear correlation in the range of 10-6-10-10 M. Moreover, the substrate still has excellent SERS performance after 12 times of repeated use. These properties indicate that this sensor may provide broad prospects for the practical application of SERS in food and environmental monitoring.
Insights
Researchers developed a novel sensor for detecting malachite green (MG) antibiotic residues in water. This reusable surface-enhanced Raman spectroscopy (SERS) sensor offers high sensitivity and selectivity for environmental monitoring.
Area of Science:
- Analytical Chemistry
- Materials Science
- Environmental Science
Background:
- Antibiotic residues, such as malachite green (MG), contaminate food and water due to overuse.
- Sensitive and reliable detection methods are crucial for monitoring these contaminants.
Purpose of the Study:
- To fabricate a novel molecularly imprinted polymer-based surface-enhanced Raman spectroscopy (SERS) sensor.
- To achieve sensitive, selective, and reusable detection of trace malachite green in environmental water.
Main Methods:
- Fabrication of SiO2@Au nanoparticles for SERS activity.
- Molecular imprinting of malachite green using dopamine polymerization (SA-100@MIP).
- Detection of MG in pond water samples using the developed sensor.
Main Results:
- The SA-100@MIP sensor demonstrated high sensitivity and selectivity for MG detection.
- A detection limit of 0.1 nM in pond water was achieved.
- The sensor showed a good linear correlation for MG concentrations between 10^-6 and 10^-10 M.
- Excellent SERS performance was maintained after 12 reuse cycles.
Conclusions:
- The developed SA-100@MIP SERS sensor is effective for trace MG detection in environmental water.
- The sensor's sensitivity, selectivity, and reusability show promise for practical applications in food and environmental monitoring.
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