Food additives characterization by infrared, Raman, and surface‐enhanced Raman spectroscopies

Podstawka, Edyta; Światłowska, Małgorzata; Borowiec, Ewa; Proniewicz, Leonard M.

doi:10.1002/jrs.1653

Cited by 68 publications

(30 citation statements)

References 29 publications

(31 reference statements)

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“…Carnitine and acyl carnitines being chiral molecules, optical rotation (OR) and circular dichroism in the UV range (electronic circular dichroism, ECD) were measured; in the latter case, ECD has been used as a detector of enantiomeric separation, down the line of HPLC separation protocol, without the accuracy required in a dedicated ECD experiment. To the best of our knowledge, though, no one has ever measured vibrational circular dichroism (VCD); yet various forms of vibrational spectroscopy, including IR, Raman, and SERS (surface‐enhanced Raman spectroscopy) have been carried out and demonstrated to be useful . VCD has acquired increasing importance through the years in the chiroptical spectroscopies field and has permitted tackling several problems, including determination of the absolute configuration (AC), investigation of conformational properties, chiral recognition and conformation, and the role of biomolecules.…”

Section: Methodsmentioning

confidence: 99%

Vibrational Circular Dichroism (VCD) Reveals Subtle Conformational Aspects and Intermolecular Interactions in the Carnitine Family

et al. 2015

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Vibrational circular dichroism spectra (VCD) in the mid-IR region and electronic circular dichroism (ECD) spectra for three carnitine derivatives in the form of hydrochloride salts were recorded in deuterated methanol solutions. Density Functional Theory calculations help one to understand the significance of the observed VCD bands. VCD and ECD spectra are informative about the absolute configuration of the molecule, but VCD data reveal also some conformational aspects in the N,N,N-trimethyl moiety and inform us about intermolecular interactions gained from the carbonyl stretching region for the acyl substituted carnitines.

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Section: Methodsmentioning

confidence: 99%

Vibrational Circular Dichroism (VCD) Reveals Subtle Conformational Aspects and Intermolecular Interactions in the Carnitine Family

et al. 2015

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“…In the case of SERS spectrum of β-hydroxy-β-methylbutanoic acid, the bands at 1447, 880, 725, and 692 cm −1 due to CH 2 and CH 3 modes suggest that these moieties assist the molecule to bind to the silver surface. [80] In the SERS spectrum of 2-amino-5-nitropyridine, [81] the symmetric NO 2 stretching mode corresponds to the most intense band, which appears broad and significantly downshifted from 1344 to 1326 cm −1 suggesting binding to silver through the lone pairs of the oxygen atom. Carrasco et al [82] observed the NO 2 stretch in the SERS spectrum at ∼1500 cm −1 with medium intensity, which demonstrated the importance of the nitro group in regard to the interaction with the metal surface.…”

Section: Sers Spectrummentioning

confidence: 99%

FT‐IR, FT‐Raman, SERS spectra and computational calculations of 4‐ethyl‐N‐(2′‐hydroxy‐5′‐nitrophenyl)benzamide

Panicker¹,

Varghese

Ushakumari³

et al. 2009

J Raman Spectroscopy

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Fourier transform infrared (FT-IR) and FT-Raman spectra of 4-ethyl-N-(2 -hydroxy-5 -nitrophenyl)benzamide were recorded and analyzed. A surface-enhanced Raman scattering (SERS) spectrum was recorded in silver colloid. The vibrational wavenumbers and corresponding vibrational assignments were examined theoretically using the Gaussian03 set of quantum chemistry codes. The red shift of the NH stretching wavenumber in the infrared spectrum from the computational wavenumber indicates the weakening of the NH bond resulting in proton transfer to the neighboring oxygen atom. The simultaneous IR and Raman activation of the C O stretching mode gives the charge transfer interaction through a π -conjugated path. The presence of methyl modes in the SERS spectrum indicates the nearness of the methyl group to the metal surface, which affects the orientation and metal molecule interaction. The first hyperpolarizability and predicted infrared intensities are reported. The calculated first hyperpolarizability is comparable with the reported values of similar derivatives and is an attractive subject for future studies of nonlinear optics. Optimized geometrical parameters of the title compound are in agreement with reported structures.

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“…In SERS, Raman scattering signals of an analyte are greatly enhanced through adsorption of the analyte onto a roughened metal (typically Au, Ag, and Cu) surface [8,9]. Many studies have indicated the great potential of applying SERS as an analytical tool in various areas; yet SERS is still in its early development stage in food science and aquaculture [10][11][12][13][14]. The main factors impeding the successful application of SERS by the food science researchers are the high cost and lack of resource to make effective surface enhanced substrates.…”

Section: Introductionmentioning

confidence: 99%

Determination of chloramphenicol and crystal violet with surface enhanced Raman spectroscopy

Lai

Zhang

et al. 2011

Sens. & Instrumen. Food Qual.

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Residual chloramphenicol, crystal violet and other illegal drugs in fish pose potential health risks and adverse impact to the aquatic environment, and are important concerns of consumers and regulatory agencies. Surface enhanced Raman spectroscopy (SERS) with two different types of SERS-active substrates were used to collect the spectra of chloramphenicol and crystal violet over a concentration range of 10 ng/mL to10 lg/mL. Partial least squares regression and multiple linear regression models were developed for quantitative prediction of these drugs from their spectral data (n = 32). The limit of detection for chloramphenicol and crystal violet was 50 and 20 ng/mL, respectively, and R 2 values of chemometric models were from 0.82 to 0.87, indicating potential of applying SERS for determination of trace amounts of prohibited substances in food.

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Food additives characterization by infrared, Raman, and surface‐enhanced Raman spectroscopies

Cited by 68 publications

References 29 publications

Vibrational Circular Dichroism (VCD) Reveals Subtle Conformational Aspects and Intermolecular Interactions in the Carnitine Family

Vibrational Circular Dichroism (VCD) Reveals Subtle Conformational Aspects and Intermolecular Interactions in the Carnitine Family

FT‐IR, FT‐Raman, SERS spectra and computational calculations of 4‐ethyl‐N‐(2′‐hydroxy‐5′‐nitrophenyl)benzamide

Determination of chloramphenicol and crystal violet with surface enhanced Raman spectroscopy

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