Raman spectroscopy of ‘Bisphenol A’

Ullah, Ramzan; Zheng, Yuanzhou

doi:10.1016/j.molstruc.2015.12.060

Cited by 27 publications

(14 citation statements)

References 14 publications

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“…Our calculations agreed with the results published by Ullah and Zheng [ 32 , 33 ], but the assignment of particular bands was modified in view of the SERS results where in-plane vibrations of benzene-like derivatives played a main role. BPs have many vibrations with complex motions and some of them are calculated at very similar wavenumbers.…”

Section: Resultssupporting

confidence: 88%

“…The Raman spectra of the different BPs’ solid samples together with their chemical structures are shown in Figure 1 a. Some characteristic bands can be found common to all BPs, whose assignments were previously reported [ 32 , 33 ] ( Table S1 ) and were reassigned according to B3LYP/LanL2DZ force field results (see below, Table 1 and Table S2 ).…”

Section: Resultsmentioning

confidence: 82%

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Surface-Enhanced Raman Spectroscopy for Bisphenols Detection: Toward a Better Understanding of the Analyte–Nanosystem Interactions

et al. 2021

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Silver nanoparticles functionalized with thiolated β-cyclodextrin (CD-SH) were employed for the detection of bisphenols (BPs) A, B, and S by means of surface-enhanced Raman spectroscopy (SERS). The functionalization of Ag nanoparticles with CD-SH leads to an improvement of the sensitivity of the implemented SERS nanosensor. Using a multivariate analysis of the SERS data, the limit of detection of these compounds was estimated at about 10−7 M, in the range of the tens of ppb. Structural analysis of the CD-SH/BP complex was performed by density functional theory (DFT) calculations. Theoretical results allowed the assignment of key structural vibrational bands related to ring breathing motions and the inter-ring vibrations and pointed out an external interaction due to four hydrogen bonds between the hydroxyl groups of BP and CD located at the external top of the CD cone. DFT calculations allowed also checking the interaction energies of the different molecular species on the Ag surface and testing the effect of the presence of CD-SH on the BPs’ affinity. These findings were in agreement with the experimental evidences that there is not an actual inclusion of BP inside the CD cavity. The SERS sensor and the analysis procedure of data based on partial least square regression proposed here were tested in a real sample consisting of the detection of BPs in milk extracts to validate the detection performance of the SERS sensor.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 82%

Surface-Enhanced Raman Spectroscopy for Bisphenols Detection: Toward a Better Understanding of the Analyte–Nanosystem Interactions

et al. 2021

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“…BPA has also been studied by THz spectroscopy where one of its vibrational modes was observed but in FTIR spectroscopy, main focus was on CH and OH stretching [7]. Various molecular vibrations of BPA have been identified through Raman spectroscopy by our research group [8]. However, Raman spectroscopy and FTIR spectroscopy are complementary to each other.…”

Section: Introductionmentioning

confidence: 99%

Fourier Transform Infrared Spectroscopy of “Bisphenol A”

Ullah

Ahmad

Zheng

2016

Journal of Spectroscopy

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“…The resulting Raman measurements, shown in Figure 4b–d, clearly demonstrate characteristic spectra of the three types of molecules—BPA, tetracycline, and diclofenac for concentrations down to 10 −12 m , showing characteristic peaks of each target molecule (Table S1, Supporting Information). [ 36 ] The absence of Raman signals from DNA base molecules, which was measured with a 633 nm laser source, can be attributed to a small Raman cross‐section of DNA base molecules at the wavelength. Observation of DNA signals is best optimized for an excitation laser wavelength of 785 nm (Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Selective, Quantitative, and Multiplexed Surface‐Enhanced Raman Spectroscopy Using Aptamer‐Functionalized Monolithic Plasmonic Nanogrids Derived from Cross‐Point Nano‐Welding

Kyung

Baek

Han

et al. 2020

Adv Funct Materials

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Recent advances in surface-enhanced Raman spectroscopy (SERS) have resulted in multiplexing with unprecedented levels of sensitivity and selectivity in trace-amount detection. However, quantification of multiple trace-amount molecules with ng-level accuracy has yet to be demonstrated due to nonuniform distribution of SERS enhancement and random adsorption of molecules at low concentrations. While Raman reporter-free SERS is favorable for quantification in that the unique fingerprint spectra of molecules enable specific molecular identification, it has yet to be demonstrated due to poor reproducibility and insufficient SERS enhancement. Raman reporter-free multiplex SERS with highly accurate quantification is successfully realized by versatile aptamer-functionalized plasmonic Au nanogrids with uniform SERS enhancement. By cross-point nano-welding, monolithic Au nanogrids with excellent uniformity and high stability in aqueous media are produced. Raman reporter-free multiplex detection and highly accurate quantification of concentration and composition is realized at picomolar levels. As a demonstration, Au nanogrids functionalized with bisphenol A-specific aptamers successfully detect and quantify trace-amounts of bisphenol A (8.49 ng) from thermal receipt paper. Moreover, principal component analysis is applied to multiplex SERS spectra to establish a ternary composition map, which can potentially serve as a practical reference for future Raman reporterfree SERS.

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Raman spectroscopy of ‘Bisphenol A’

Cited by 27 publications

References 14 publications

Surface-Enhanced Raman Spectroscopy for Bisphenols Detection: Toward a Better Understanding of the Analyte–Nanosystem Interactions

Surface-Enhanced Raman Spectroscopy for Bisphenols Detection: Toward a Better Understanding of the Analyte–Nanosystem Interactions

Fourier Transform Infrared Spectroscopy of “Bisphenol A”

Selective, Quantitative, and Multiplexed Surface‐Enhanced Raman Spectroscopy Using Aptamer‐Functionalized Monolithic Plasmonic Nanogrids Derived from Cross‐Point Nano‐Welding

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