Author’s reply

Kumar, Suresh; Mahanta, Sunayan

doi:10.4103/0019-5413.139894

Cited by 4 publications

(5 citation statements)

References 6 publications

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“…Characteristic bonding modes are revealed also in the FTIR spectra of the obtained complexes (see Table and Figures S1 to S6 in the Supporting Information for compounds 1 – 6 , respectively). All of them contain the typical pattern of M=O and M–O–M stretching bands representative of the Keggin phosphometalate anion together with a set of bands originating from vibrations in the protonated molecules of GlyGly dipeptide and Arg amino acid …”

Section: Resultssupporting

confidence: 79%

“…All of them contain the typical pattern of M=O and M-O-M stretching bands representative of the Keggin phosphometalate anion [21][22][23] together with a set of bands originating from vibrations in the protonated molecules of GlyGly dipeptide [24] and Arg amino acid. [25] The more water-rich structures demonstrate stronger and more sophisticated pattern in the part of the spectrum related to hydrogen bonding between NH-and O(H)-terminated bonds.…”

Section: Vibrational Spectramentioning

confidence: 99%

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Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

et al. 2019

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Metal oxide nanoparticles are potentially attractive tools for biomedical applications such as bioimaging and drug delivery. This urges experimental studies of their surface interaction with biomolecules, in the first hand, amino acids and proteins. Especially intriguing is the effect of not only shape and size but of chemical nature of the particles on the nature of bonds emerging between them and biomolecules. In present study we isolated, structurally characterized and compared complexes with model molecules glycylglycine and arginine of spherically shaped Keggin POMs [PM 12 O 40 ] 3-, M = Mo, W as models for individual nanoparticles ca. 1 nm in size. Surpris- [a]

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Section: Resultssupporting

confidence: 79%

Section: Vibrational Spectramentioning

confidence: 99%

Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

et al. 2019

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“…Hence, a correct vibrational assignment is required in this respect. Consulting the previously published allocation to the normal mode motions for free or metal‐bound BK, piperidine, tiophene, L‐phenylalanine, L‐arginine, and L‐proline, in Table , we propose and summarize the appropriate assignments along with the band positions observed in the FT‐Raman and SERS spectra in the silver sol.…”

Section: Resultsmentioning

confidence: 99%

Characterization of adsorption mode of new B₂ bradykinin receptor antagonists onto colloidal Ag substrate

Sobolewski

Proniewicz

Skołuba

et al. 2013

J Raman Spectroscopy

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In this paper, the surface‐enhanced Raman scattering (SERS) spectra of the potent B2 bradykinin receptor antagonists, [D‐Arg0,Hyp3,Thi5,8,L‐Pip7]BK, Aaa[D‐Arg0,Hyp3,Thi5,8,L‐Pip7]BK, [D‐Arg0,Hyp3,Thi5,D‐Phe7,L‐Pip8]BK, and Aaa[D‐Arg0,Hyp3,Thi5,D‐Phe7,L‐Pip8]BK, were measured when immobilized onto a colloidal assembly of apparently randomly adhering Ag spheres with diameters of approximately 20 – 25 nm. The observed SERS bands corresponding to different vibrational modes of the molecule, attached to or near Ag, and the variations in these bands resulting from competitive interactions of the functional groups of the peptides with the SERS‐active Ag surfaces were analyzed in this study. Briefly, it was shown that Pip, in generally in vertical orientation, and Thi, in the edge‐on position, relative to the colloidal Ag surface interacted with this surface through their lone electron pairs on the nitrogen and sulfur atoms, respectively. The imide bond of the X‐Pro peptide linkage and the guanidine group of Arg were involved in the adsorption process. In addition, it was demonstrated that the specific differences in the amino acid sequences slightly influenced the mode of adsorption. For example, Aaa in Aaa[D‐Arg0,Hyp3,Thi5,8,L‐Pip7]BK and Aaa[D‐Arg0,Hyp3,Thi5,D‐Phe7,L‐Pip8]BK and D‐Phe (vertical with respect to the colloidal Ag surface) in [D‐Arg0,Hyp3,Thi5,D‐Phe7,L‐Pip8]BK, and Aaa[D‐Arg0,Hyp3,Thi5,D‐Phe7,L‐Pip8]BK assisted in the adsorption of these peptides onto the colloidal Ag particles. To discuss these spectral alterations due to the different surface adsorption mechanisms of these peptides, the spectral changes were analyzed according to the adsorption process and Fourier‐transform‐Raman spectra. Copyright © 2013 John Wiley & Sons, Ltd.

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“…The band assignment is proposed for Arg at controlled pH of 6.7. Kumar et al recorded and analyzed the IR and Raman spectra for Arg. These authors also recorded the UV–visible spectrum for aqueous solutions of Arg at different pH values.…”

Section: Introductionmentioning

confidence: 99%

The effect of the pH on the interaction of L‐arginine with colloidal silver nanoparticles. A Raman and SERS study

Garrido

Aguayo

Clavijo

et al. 2013

J Raman Spectroscopy

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Artículo de publicación ISIRaman and surface enhanced Raman scattering (SERS) spectroscopies were used to study the pH effect (7 to 9) on the interaction of arginine (Arg) with colloidal Ag nanoparticles (AgNps). A new methodology was implemented in order to obtain reproducible SERS spectra in solution. The dependence of the Arg concentration on the stability of the AgNps is discussed. A pH increasing of the colloidal solution to the limits of the Arg pKa2 value induces a preferential and stable Arg–metal interaction. j potential measurements of the Arg–AgNps system at different pH conditions studied provide information about the Arg–AgNps interaction; the pH increasing favors the interaction. SERS spectra at pH 7 indicate that the molecule interacts with the Ag surface only through the guanidinium fragment. By increasing the pH to 9, the molecule adopts a new conformation on the surface; the metal–analyte interaction is verified through the guanidinium, carboxylate and the aliphatic moieties. In addition, theoretical calculations performed by using the extended Hückel method for a model of Arg interacting with an Ag surface support the observed SERS results

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Author’s reply

Cited by 4 publications

References 6 publications

Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Characterization of adsorption mode of new B₂ bradykinin receptor antagonists onto colloidal Ag substrate

The effect of the pH on the interaction of L‐arginine with colloidal silver nanoparticles. A Raman and SERS study

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Author’s reply

Cited by 4 publications

References 6 publications

Complexes of Keggin POMs [PM12O40]3– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Complexes of Keggin POMs [PM12O40]3– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Characterization of adsorption mode of new B2 bradykinin receptor antagonists onto colloidal Ag substrate

The effect of the pH on the interaction of L‐arginine with colloidal silver nanoparticles. A Raman and SERS study

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Product

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Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Complexes of Keggin POMs [PM₁₂O₄₀]³^– (M = Mo, W) with GlyGly Peptide and Arginine – Crystal Structures and Solution Reactivity

Characterization of adsorption mode of new B₂ bradykinin receptor antagonists onto colloidal Ag substrate