Optimized core–shell Au@Ag nanoparticles for label-free Raman determination of trace Rhodamine B with cancer risk in food product

Wang, Hui; Guo, Xiaoyu; Fu, Shuyue; Yang, Tianxi; Wen, Ying; Yang, Haifeng

doi:10.1016/j.foodchem.2015.04.122

Cited by 51 publications

(29 citation statements)

References 28 publications

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“…The HRTEM images (Fig. 40 Nevertheless, the formation mechanism of the SrTiO 3 /NiFe 2 O 4 PITs is somewhat different and the schematic diagram is presented in Fig. 4(c)) and declares that SrTiO 3 nanoparticles stack along the interior axis of NiFe 2 O 4 nanotubes.…”

Section: Resultsmentioning

confidence: 98%

“…By counting more than 50 individuals, their average diameters are estimated to be about 81 nm and 96 nm, respectively. 40 Large amount of RhB dyes released in the industrial wastewater, which is a toxic pollution source, is very dangerous. 3(c)) prepared by the single-spinneret electrospinning, abundant of uniform pores regularly distribute on their surface (seeing the inset).…”

Section: Resultsmentioning

confidence: 99%

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Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Jing

Wang

et al. 2015

Nanoscale

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Being capable of gathering advanced optical, electrical and magnetic properties originating from different components, multifunctional composite nanomaterials have been of concern increasingly. Herein, we have successfully demonstrated the preparation of SrTiO3/NiFe2O4 porous nanotubes (PNTs) and SrTiO3/NiFe2O4 particle-in-tubes (PITs) via a single-spinneret electrospinning and a side-by-side-spinneret electrospinning, respectively. The products were characterized by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, UV-visible diffuse reflectance spectra and a vibrating sample magnetometer in detail. The results indicate that SrTiO3/NiFe2O4 PNTs are the heterojunction nanotubes by connecting perovskite SrTiO3 and spinel NiFe2O4 nanoparticles, but SrTiO3/NiFe2O4 PITs are the self-assembled core/shell structures by embedding SrTiO3 nanoparticles into NiFe2O4 nanotubes. Compared with pure SrTiO3 nanofibers, the two SrTiO3/NiFe2O4 composites exhibit a powerful light response and excellent room temperature ferromagnetism. The magnetic separations directly reveal that such amazing recycling efficiencies of about 95% for SrTiO3/NiFe2O4 PNTs and about 99.5% for SrTiO3/NiFe2O4 PITs are obtained. Furthermore, both the magnetic composites perform considerable photocatalytic activity in the degradation of rhodamine B. We propose that Kirkendall-diffusion and phase-separation are probably responsible for the formation of SrTiO3/NiFe2O4 PITs, and this work could provide a feasible way to assemble the core/shell structures of different materials.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Jing

Wang

et al. 2015

Nanoscale

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“…36 The Au@Ag core-shell NPs were prepared by coating the Ag shell on the Au NPs. 37,38 Briefly, 100 mL of as-prepared Au NPs solution was double diluted with deionized water, heated to boiling, and then vigorously stirred. Subsequently, 2 mL of trisodium citrate (1%, w/v) was added to the suspension and used as the reducing agent.…”

Section: Preparation Of the Secondary Enhanced Npsmentioning

confidence: 99%

Combined use of vancomycin-modified Ag-coated magnetic nanoparticles and secondary enhanced nanoparticles for rapid surface-enhanced Raman scattering detection of bacteria

Wang¹,

Liu³

et al. 2018

IJN

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Background Pathogenic bacteria have always been a significant threat to human health. The detection of pathogens needs to be rapid, accurate, and convenient. Methods We present a sensitive surface-enhanced Raman scattering (SERS) biosensor based on the combination of vancomycin-modified Ag-coated magnetic nanoparticles (Fe 3 O 4 @Ag-Van MNPs) and Au@Ag nanoparticles (NPs) that can effectively capture and discriminate bacterial pathogens from solution. The high-performance Fe 3 O 4 @Ag MNPs were modified with vancomycin and used as bacteria capturer for magnetic separation and enrichment. The modified MNPS were found to exhibit strong affinity with a broad range of Gram-positive and Gram-negative bacteria. After separating and rinsing bacteria, Fe 3 O 4 @Ag-Van MNPs and Au@Ag NPs were synergistically used to construct a very large number of hot spots on bacteria cells, leading to ultrasensitive SERS detection. Results The dominant merits of our dual enhanced strategy included high bacterial-capture efficiency (>65%) within a wide pH range (pH 3.0–11.0), a short assay time (<30 min), and a low detection limit (5×10 2 cells/mL). Moreover, the spiked tests show that this method is still valid in milk and blood samples. Owing to these capabilities, the combined system enabled the sensitive and specific discrimination of different pathogens in complex solution, as verified by its detection of Gram-positive bacterium Escherichia coli , Gram-positive bacterium Staphylococcus aureus , and methicillin-resistant S. aureus . Conclusion This method has great potential for field applications in food safety, environmental monitoring, and infectious disease diagnosis.

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“…Phospholipase activity was determined with phospholipid emulsion generally according to Yang et al (29). One unit of phospholipase (U) is the amount of enzyme which releases 1 μmol of titratable FFA per minute.…”

Section: Enzyme Activity Assaymentioning

confidence: 99%

Purification, Characterization and Application of a Cold- Adapted Phospholipase A1 fromBacillus Cereus Sp.AF-1

Zhan

Jiang

Pan

et al. 2013

Biotechnology & Biotechnological Equipment

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Optimized core–shell Au@Ag nanoparticles for label-free Raman determination of trace Rhodamine B with cancer risk in food product

Cited by 51 publications

References 28 publications

Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Combined use of vancomycin-modified Ag-coated magnetic nanoparticles and secondary enhanced nanoparticles for rapid surface-enhanced Raman scattering detection of bacteria

Purification, Characterization and Application of a Cold- Adapted Phospholipase A1 fromBacillus Cereus Sp.AF-1

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Optimized core–shell Au@Ag nanoparticles for label-free Raman determination of trace Rhodamine B with cancer risk in food product

Cited by 51 publications

References 28 publications

Hierarchical SrTiO3/NiFe2O4 composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Hierarchical SrTiO3/NiFe2O4 composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Combined use of vancomycin-modified Ag-coated magnetic nanoparticles and secondary enhanced nanoparticles for rapid surface-enhanced Raman scattering detection of bacteria

Purification, Characterization and Application of a Cold- Adapted Phospholipase A1 fromBacillus Cereus Sp.AF-1

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Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity

Hierarchical SrTiO₃/NiFe₂O₄ composite nanostructures with excellent light response and magnetic performance synthesized toward enhanced photocatalytic activity