Rapid qualitative and quantitative determination of food colorants by both Raman spectra and Surface-enhanced Raman Scattering (SERS)

Ai, Yujie; Liang, Pei; Wu, Yuqi; Dong, Qin; Li, Jing-bin; Yang, Bai; Xu, Bi-Jie; Yu, Zhi; Ni, Dejiang

doi:10.1016/j.foodchem.2017.09.019

Cited by 140 publications

(64 citation statements)

References 23 publications

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“…The substrate was calibrated with different concentrations of R6G (Figure a). The R6G characteristic peaks can all be detected by the substrate, which is consistent with the literature . The main characteristic peaks were still obvious at 10 nM.…”

Section: Resultssupporting

confidence: 90%

A silver self‐assembled monolayer‐decorated polydimethylsiloxane flexible substrate for in situ SERS detection of low‐abundance molecules

Zhao

Hasi

Bao

et al. 2018

J Raman Spectroscopy

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The preparation of highly sensitive and low cost substrate remains challenging in surface‐enhanced Raman spectroscopy (SERS). Here, a simple silver nanoparticle‐modified thin polydimethylsiloxane (PDMS) sheet was prepared as a SERS substrate via silicon‐assisted interfacial self‐assembly transfer and Langmuir–Schaefer deposition technique. The influence of the surface coverage on PDMS was investigated and optimized to achieve the maximal signal enhancement. Through the test of rhodamine 6G and 4‐mercaptobenzoic acid probe, the substrate showed good uniformity of nanoparticles, high‐enhanced factor, homogeneity of batch, time stability, and other properties. We, then, measured thiram and tricyclazole pesticides on the surface of apples, and the results demonstrate that SERS substrates can measure pesticide residues in situ.

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Section: Resultssupporting

confidence: 90%

A silver self‐assembled monolayer‐decorated polydimethylsiloxane flexible substrate for in situ SERS detection of low‐abundance molecules

Zhao

Hasi

Bao

et al. 2018

J Raman Spectroscopy

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“…For this reason, Surface Enhanced Raman Scattering (SERS) is a powerful vibrational spectroscopic technique that can extend the sensitivity of conventional Raman spectroscopy to the single molecule level [2][3][4]. The power of SERS can be exploited for its versatility and feasibility in a wide variety of fields including polymers, materials science, biochemistry and bio-sensing, catalyst, electrochemistry, pesticides, and food additives [5][6][7][8][9]. SERS technique increases drastically the Raman signals of an analyte molecule by the presence of roughened metal noble-metals (Ag and Au) near or in proximity of the analyzed samples [10,11].…”

Section: Introductionmentioning

confidence: 99%

SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology

2020

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In this work, we prepared different morphologies of silver nanoparticles: nanosphere, triangular nanoplates, hexagonal nanoplates, and quasi-spherical shapes, through one-step synthesis. Hydrogen peroxide was used as the oxidizing agent during the reduction of silver nitrate by sodium borohydride, in the presence of tri-sodium citrate and poly-vinyl-pyrrolidone. The obtained silver nanoparticles were fully characterized by UV-Vis spectroscopy, Dynamic Light Scattering and Scanning Electron Microscopy, and successfully used as Surface Enhanced Raman Scattering (SERS) substrates. The effect of shape and morphology on the Raman scattering enhancement was evaluated by using methylene blue as target molecules. The Raman measurements demonstrated that the prepared substrates are reliable and sensitive with analytical enhancement factors, estimated to be around 105 with a concentration of methylene blue 1 μM. When triangular and hexagonal nanoplates were tested with different concentrations of analyte, they demonstrated a good linearity in Raman intensity with a good detection of methylene blue 0.1 μM.

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“…Silver nanoflowers were prepared referring to the reported method [3]. Firstly, 10 mL ultrapure water, 2 mL aqueous solution of PVP (1 %) and 0.2 mL aqueous solution of silver nitrate (1 mol L À1 ) were added into a clean beaker with magnetic stirring.…”

Section: Preparation Of Silver Nanoflowersmentioning

confidence: 99%

“…Since the Raman activity corresponds to the change in the polarizability rather than the dipole moment when the molecule vibrates, some information that cannot be detected by infrared spectroscopy can be well represented in the Raman spectrum [1]. Compared with conventional analytical methods, Raman spectroscopy has the advantages of non-destructive, rapid, no special requirements for sample preparation, and can be used for trace analysis [2,3]. Therefore, it has important application prospects in the analysis of food [4] and medicine [5], detection of microbial metabolic processes [7], diagnosis of basic microorganisms and DNA bases [9], and biomedical research [6].…”

Section: Introductionmentioning

confidence: 99%

A Rapid and Sensitive Quantitative Analysis Method for TNT using Raman Spectroscopy

Gao

Liu

Meng

et al. 2019

Propellants Explo Pyrotec

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Raman spectroscopy as a rapid and sensitive qualitative detection method has been applied in many fields; however, it is rarely used for the quantitative purpose due to poor reproducibility of peak area. Here, 2,4,6‐trinitrotoluene (TNT) and its two byproducts, 2,4‐dinitrotoluence (DNT) and 2,6‐DNT, were firstly qualitatively analyzed by Raman spectroscopy and the characteristic parameters were extracted. Then, in the range of 2 %–9 % and 10 %–90 %, the standard curves were established between the area ratio of the characteristic peaks and the content of 2,4‐DNT or 2,6‐DNT using silver nanoflowers as the enhancing substrate. The fitting correlation for TNT/2,4‐DNT or TNT/2,6‐DNT system is around 0.99. The peak area ratio of the components exhibits much better dada reproducibility than peak area, and the relative error does not exceed 9.3 % for at least six groups of parallel experiments.

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Rapid qualitative and quantitative determination of food colorants by both Raman spectra and Surface-enhanced Raman Scattering (SERS)

Cited by 140 publications

References 23 publications

A silver self‐assembled monolayer‐decorated polydimethylsiloxane flexible substrate for in situ SERS detection of low‐abundance molecules

A silver self‐assembled monolayer‐decorated polydimethylsiloxane flexible substrate for in situ SERS detection of low‐abundance molecules

SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology

A Rapid and Sensitive Quantitative Analysis Method for TNT using Raman Spectroscopy

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