Detection of a Sudan dye at low concentrations by surface-enhanced Raman spectroscopy using silver nanoparticles

Đào, Trần Cao; Lương, Trúc Quỳnh Ngân; Cao, Tuấn Anh; Kieu, Ngoc Minh

doi:10.15625/0868-3166/29/4/14178

Cited by 5 publications

(6 citation statements)

References 16 publications

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“…The first target of detection is organic dyes, because the SERS technique is extremely sensitive to them. For example with AgNFs/Si SERS substrate we have detected crystal violet down to a concentration of 0.01 ppm [27], while with AgNPs/Si substrate, sudan I with concentrations as low as 1 ppb has been detected [18]. The next detection target is pesticides and other toxic substances.…”

Section: Resultsmentioning

confidence: 97%

“…In order to fabricate AgNDs on Si (AgNDs/Si), the most important thing is to change the ratio of HF/AgNO 3 accordingly. Both chemical and electrochemical deposition can yield Ag-NDs/Si, however electrochemical deposition will give AgNDs with better branching [18]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The fabrication of arrays of silver nanoparticles, nanodendrites or nanoflowers on silicon surface has been described in detail in our works [11,15,18,19]. In brief, to produce an array of silver nanoparticles (AgNPs) on silicon, both chemical and electrochemical deposition can be used.…”

Section: Methodsmentioning

confidence: 99%

“…In brief, to produce an array of silver nanoparticles (AgNPs) on silicon, both chemical and electrochemical deposition can be used. More specifically, to chemically deposit AgNPs on Si surface, Si wafer was immersed in an aqueous solution containing 0.14 M HF and 5 mM AgNO 3 for 15 minutes at room temperature [18]. To electrochemically deposit AgNPs on Si surface, an electrochemical system has been established in which Si wafer acts as the cathode, while platinum grid serves as the anode.…”

Section: Methodsmentioning

confidence: 99%

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Fabrication of Silver Nanostructures in the Form of Particles, Dendrites and Flowers on Silicon for Use in SERS Substrates

Tran

Quynh

Cao³

et al. 2022

Comm. in Phys.

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Surface Enhanced Raman Scattering (SERS) is a technique that is increasingly being used to detect trace amounts of various types of molecules, especially organic and biological molecules. The SERS effect is available mainly due to the SERS substrate - a noble metal surface that is rough at the nano level or a set of noble metal nanoparticles in a certain arrangement. Such a SERS substrate acts as an analyte Raman signal amplifier and can provide amplification up to millions of times and even more. The amplification coefficient of the SERS substrate is determined mainly by the number of ‘hot spots’ it contains as well as the ‘hotness’ of these spots. In turn, a ‘hot spot’ is a certain space around the tips or a nanogap between particles, where the local electromagnetic field is intensely enhanced, while the ‘hotness’ is determined by the sharpness of the tips (the sharper the hotter) and tightness of the gaps (the narrower the hotter). This report presents an overview of the research results of fabricating a type of SERS substrate with a high enhancement factor, which is the SERS substrate made from silver nanostructures coated on the silicon surface. With the aim of increasing the number of ‘hot spots’ and their quality, as well as ensuring uniformity and reproducibility of the SERS substrate, silver nanostructures have been fabricated in various forms, such as nanoparticles, nanodendrites and nanoflowers. In addition, the report also mentions the use of the above silver nanostructures as SERS substrates to detect trace amounts of some pesticides and other toxic agents such as paraquat, pyridaben, thiram, cyanide...

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Fabrication of Silver Nanostructures in the Form of Particles, Dendrites and Flowers on Silicon for Use in SERS Substrates

Tran

Quynh

Cao³

et al. 2022

Comm. in Phys.

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“…Previous studies have shown that Sudan dyes at low concentration can be identified by surface-enhanced Raman scattering (SERS) [ 20 ]. However, most studies using SERS to analyze Sudan dyes have only focused on Sudan I, or have evaluated the enhancement effects of a substrate on standard Sudan dye solutions [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Multiplexed Quantification of Banned Sudan Dyes Using Surface Enhanced Raman Scattering and Chemometrics

Alomar

AlMasoud

et al. 2022

Sensors

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Azo compounds such as the Sudan dyes I–IV are frequently used illegally as colorants and added to a wide range of foods. These compounds have been linked to a number of food safety hazards. Several methods have been proposed to detect food contamination by azo compounds and most of these are laboratory based; however, the development of reliable and portable methods for the detection and quantification of food contaminated by these chemicals in low concentration is still needed due to their potentially carcinogenic properties. In this study, we investigated the ability of surface enhanced Raman scattering (SERS) combined with chemometrics to quantify Sudan I–IV dyes. SERS spectra were acquired using a portable Raman device and gold nanoparticles were employed as the SERS substrate. As these dyes are hydrophobic, they were first dissolved in water: acetonitrile (1:10, v/v) as single Sudan dyes (I–IV) at varying concentrations. SERS was performed at 785 nm and the spectra were analyzed by using partial least squares regression (PLS-R) with double cross-validations. The coefficient of determination (Q2) were 0.9286, 0.9206, 0.8676 and 0.9705 for Sudan I to IV, respectively; the corresponding limits of detection (LOD) for these dyes were estimated to be 6.27 × 10−6, 5.35 × 10−5, 9.40 × 10−6 and 1.84 × 10−6 M. Next, quadruplex mixtures were made containing all four Sudan dyes. As the number of possible combinations needed to cover the full concentration range at 5% intervals would have meant collecting SERS spectra from 194,481 samples (214 combinations) we used a sustainable solution based on Latin hypercubic sampling and reduced the number of mixtures to be analyzed to just 90. After collecting SERS spectra from these mixture PLS-R models with bootstrapping validations were employed. The results were slightly worse in which the Q2 for Sudan I to IV were 0.8593, 0.7255, 0.5207 and 0.5940 when PLS1 models (i.e., one model for one dye) was employed and they changed to 0.8329, 0.7288, 0.5032 and 0.5459 when PLS2 models were employed (i.e., four dyes were modelled simultaneously). These results showed the potential of SERS to be used as a high-throughput, low-cost, and reliable methods for detecting and quantifying multiple Sudan dyes in low concentration from illegally adulterated samples.

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Utilization of surfactant-based electrode for the study of food dyes

Murali,

Sreelekshmi,

Saraswathyamma

2024

Surfactant Based Electrochemical Sensors and Biosensors

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Detection of a Sudan dye at low concentrations by surface-enhanced Raman spectroscopy using silver nanoparticles

Cited by 5 publications

References 16 publications

Fabrication of Silver Nanostructures in the Form of Particles, Dendrites and Flowers on Silicon for Use in SERS Substrates

Fabrication of Silver Nanostructures in the Form of Particles, Dendrites and Flowers on Silicon for Use in SERS Substrates

Simultaneous Multiplexed Quantification of Banned Sudan Dyes Using Surface Enhanced Raman Scattering and Chemometrics

Utilization of surfactant-based electrode for the study of food dyes

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