Surface-Enhanced Raman Scattering Liquid Sensor for Quantitative Detection of Trace Melamine in Dairy Products

Zou, Mingqiang; Zhang, Xiaofang; Qi, Xiaohua; Liu, Feng

doi:10.5772/52485

Cited by 2 publications

(3 citation statements)

References 58 publications

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“…These studies achieved limits of detection (LOD) of 1,000 mg/L for the compounds. In other studies, surface-enhanced Raman spectroscopy (SERS) was employed to improve the sensitivity of detection levels of melamine and lowered the LOD to a range from 1 × 10 −4 to 2 mg/L (Kim et al, 2012;Mecker et al, 2012;Zhao et al, 2013;Zou et al, 2013;Giovannozzi et al, 2014;Guo et al, 2014;Yang et al, 2014). However, the reliability of SERS for quantitative analysis was hampered by its low reproducibility, partly due to the stochastic nature of the "hotspots" of intense electromagnetic field between adjacent gold nanostructures (Moskovits, 2013).…”

Section: Introductionmentioning

confidence: 99%

Rapid, sensitive, and reproducible screening of liquid milk for adulterants using a portable Raman spectrometer and a simple, optimized sample well

Nieuwoudt

Holroyd

McGoverin

et al. 2016

Journal of Dairy Science

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We have developed a powerful general spectroscopic method for rapidly screening liquid milk for adulterants by combining reflective focusing wells simply fabricated in aluminum with a small, portable Raman spectrometer with a focusing fiber optic probe. Hemispherical aluminum sample wells were specially designed to optimize internal reflection and sampling volume by matching the focal length of the mirror to the depth of focus of the laser probe. The technique was tested on milk adulterated with 4 different nitrogen-rich compounds (melamine, urea, dicyandiamide, and ammonium sulfate) and sucrose. No sample preparation of the milk was needed, and the total analysis time was 4min. Reliable sample presentation enabled average reproducibility of 8% residual standard deviation. The limit of detection interval measured from partial least squares calibrations ranged between 140 and 520mg/L for the 4 N-rich compounds and between 7,000 and 36,000mg/L (0.7-3.6%) for sucrose. The portability of the system and the reliability and reproducibility of this technique open opportunities for general, reagentless screening of milk for adulterants at the point of collection.

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Section: Introductionmentioning

confidence: 99%

Rapid, sensitive, and reproducible screening of liquid milk for adulterants using a portable Raman spectrometer and a simple, optimized sample well

Nieuwoudt

Holroyd

McGoverin

et al. 2016

Journal of Dairy Science

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“…Methods used to determine residual deltamethrin pesticides include gas chromatography [6,7], high-performance liquid chromatography (HPLC) [8,9], capillary electrophoresis [10,11] and fluorescence quantification [12,13]. However, these techniques are time-consuming and necessitate access to complex and expensive laboratory facilities, particularly for sample preparation and clean-up [14,15]. Therefore, creating a simple, cost-effective, quick and sensitive approach for the detection of deltamethrin pesticides in food is critical.…”

Section: Introductionmentioning

confidence: 99%

“…Several previous investigations have reported that the process of detecting an analyte using liquid SERS is not straightforward. The Rhodamine 6 G analyte solution is dissolved and centrifuged into ethanol [37], and liquid milk containing melamine is diluted, centrifuged and delaminated before being mixed with the colloidal nanoparticles, which are measured using a Raman Spectrometer [14]. In this experiment, we developed the liquid SERS method in a more straightforward and easier manner than previous experiments.…”

Section: Introductionmentioning

confidence: 99%

Liquid Surface-Enhanced Raman Spectroscopy (SERS) Sensor-Based Au-Ag Colloidal Nanoparticles for Easy and Rapid Detection of Deltamethrin Pesticide in Brewed Tea

Hidayah

Triyono

Herbani³

et al. 2021

Crystals

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Deltamethrin pesticides can cause inflammation, nephrotoxicity and hepatotoxicity as well as affect the activity of antioxidant enzymes in tissues. As a result of this concern, there is a rising focus on the development of fast and reliable pesticide residue testing to minimise potential risks to humans. The goal of this study is to use Au-Ag colloid nanoparticles as liquid surface-enhanced Raman spectroscopy (SERS) to improve the Raman signal in the detection of deltamethrin pesticide in a brewed tea. The liquid SERS system is fascinating to study due to its ease of use and its unlikeliness to cause several phenomena, such as photo-bleaching, combustion, sublimation and even photo-catalysis, which can interfere with the Raman signal, as shown in the SERS substrate. Our liquid SERS system is simpler than previous liquid SERS systems that have been reported. We performed the detection of pesticide analyte directly on brewed tea, without diluting it with ethanol or centrifuging it. Femtosecond laser-induced photo-reduction was employed to synthesise the liquid SERS of Au, Au-Ag, and Ag colloidal nanoparticles. The SERS was utilised to detect deltamethrin pesticide in brewed tea. The result showed that liquid SERS-based Ag NPs significantly enhance the Raman signal of pesticides compared with liquid SERS-based Au NPs and Au-Ag Nanoalloys. The maximum residue limits (MRLs) in tea in Indonesia are set at 10 ppm. Therefore, this method was also utilised to detect and improve, to 0.01 ppm, the deltamethrin pesticide Limit of Detection (LOD).

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Surface-Enhanced Raman Scattering Liquid Sensor for Quantitative Detection of Trace Melamine in Dairy Products

Cited by 2 publications

References 58 publications

Rapid, sensitive, and reproducible screening of liquid milk for adulterants using a portable Raman spectrometer and a simple, optimized sample well

Rapid, sensitive, and reproducible screening of liquid milk for adulterants using a portable Raman spectrometer and a simple, optimized sample well

Liquid Surface-Enhanced Raman Spectroscopy (SERS) Sensor-Based Au-Ag Colloidal Nanoparticles for Easy and Rapid Detection of Deltamethrin Pesticide in Brewed Tea

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