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Sassi P, Comez L, D'Amico F, Rossi B, Bartolini G, Fioretto D, Paolantoni M. Ultraviolet Resonant Raman Scattering of Electrolyte Solutions. APPLIED SPECTROSCOPY 2024:37028241245443. [PMID: 38632936 DOI: 10.1177/00037028241245443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
Saltwater stands as the most prevalent liquid on Earth. Consequently, substantial interest has been directed toward its characterization, both as an independent system and as a solvent for complex structures such as biomacromolecules. In the last few decades, special emphasis was placed on the investigation of the hydration properties of ions for the fundamental role they play in numerous chemical processes. In this study, we employed multi-wavelength Raman spectroscopy to examine the hydration shell surrounding bromide ions in solutions of simple electrolytes, specifically lithium bromide, potassium bromide, and cesium bromide, at two different concentrations. Cation-induced differences among electrolytes were observed in connection to their tendency to form ion pairs. An increased sensitivity to reveal the structure of the first hydration shell was evidenced when employing ultraviolet excitation in the 228-266 nm range, under resonance conditions with the charge transfer transition to the solvent peaked at about 200 nm. Other than a significant increase in the Raman cross-section for the OH stretching band when shifting from pure water to the solution, a larger enhancement for the Raman signal of the H-O-H bending mode over the stretching vibration was observed. Thus, the bending band plays a crucial role in monitoring the H-bond structure of water around the anions related to the charge distribution within the first hydration shell of anions, being an effective probe of hydration phenomena.
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Affiliation(s)
- Paola Sassi
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Perugia, Italy
| | - Lucia Comez
- CNR-Istituto Officina dei Materiali (IOM), Perugia, Italy
| | - Francesco D'Amico
- Elettra-Sincrotrone Trieste S.C.p.A. di interesse nazionale, Trieste, Italy
| | - Barbara Rossi
- Elettra-Sincrotrone Trieste S.C.p.A. di interesse nazionale, Trieste, Italy
| | - Gabriele Bartolini
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Perugia, Italy
| | - Daniele Fioretto
- Dipartimento di Fisica e Geologia, Università di Perugia, Perugia, Italy
| | - Marco Paolantoni
- Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, Perugia, Italy
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Besemer M, Bloemenkamp R, Ariese F, Manen HJV. Identification of Multiple Water–Iodide Species in Concentrated NaI Solutions Based on the Raman Bending Vibration of Water. J Phys Chem A 2016; 120:709-14. [DOI: 10.1021/acs.jpca.5b10102] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthieu Besemer
- LaserLaB VU University, De Boelelaan
1081, 1081 HV Amsterdam, The Netherlands
- Supply Chain, Research & Development, Strategic Research Group Measurement & Analytical Science, AkzoNobel, Zutphenseweg 10, 7418 AJ Deventer, The Netherlands
- TI-COAST, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Rob Bloemenkamp
- Supply Chain, Research & Development, Strategic Research Group Measurement & Analytical Science, AkzoNobel, Zutphenseweg 10, 7418 AJ Deventer, The Netherlands
| | - Freek Ariese
- LaserLaB VU University, De Boelelaan
1081, 1081 HV Amsterdam, The Netherlands
| | - Henk-Jan van Manen
- Supply Chain, Research & Development, Strategic Research Group Measurement & Analytical Science, AkzoNobel, Zutphenseweg 10, 7418 AJ Deventer, The Netherlands
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Burova TG, Ermolenkov VV, Ten GN, Kadrov DM, Nurlygaianova MN, Baranov VI, Lednev IK. Ionic and Tautomeric Composition of Cytosine in Aqueous Solution: Resonance and Non-Resonance Raman Spectroscopy Study. J Phys Chem A 2013; 117:12734-48. [DOI: 10.1021/jp406228t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatiana G. Burova
- Saratov State University, 155
Moskovskaya Street, Saratov 410026, Russia
| | - Vladimir V. Ermolenkov
- University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
| | - Galina N. Ten
- Saratov State University, 155
Moskovskaya Street, Saratov 410026, Russia
| | - Dmitriy M. Kadrov
- Saratov State University, 155
Moskovskaya Street, Saratov 410026, Russia
| | | | - Victor I. Baranov
- Vernadsky
Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin Street, Moscow 119991, Russia
| | - Igor K. Lednev
- University at Albany, State University of New York, 1400 Washington Avenue, Albany, New York 12222, United States
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Ahmed M, Singh AK, Mondal JA, Sarkar SK. Water in the Hydration Shell of Halide Ions Has Significantly Reduced Fermi Resonance and Moderately Enhanced Raman Cross Section in the OH Stretch Regions. J Phys Chem B 2013; 117:9728-33. [DOI: 10.1021/jp403618x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mohammed Ahmed
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Ajay K. Singh
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Jahur A. Mondal
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
| | - Sisir K. Sarkar
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India
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Soniat M, Rick SW. The effects of charge transfer on the aqueous solvation of ions. J Chem Phys 2012; 137:044511. [DOI: 10.1063/1.4736851] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Xiong K, Punihaole D, Asher SA. UV resonance Raman spectroscopy monitors polyglutamine backbone and side chain hydrogen bonding and fibrillization. Biochemistry 2012; 51:5822-30. [PMID: 22746095 PMCID: PMC3415266 DOI: 10.1021/bi300551b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We utilize 198 and 204 nm excited UV resonance Raman spectroscopy (UVRR) and circular dichroism spectroscopy (CD) to monitor the backbone conformation and the Gln side chain hydrogen bonding (HB) of a short, mainly polyGln peptide with a D(2)Q(10)K(2) sequence (Q10). We measured the UVRR spectra of valeramide to determine the dependence of the primary amide vibrations on amide HB. We observe that a nondisaggregated Q10 (NDQ10) solution (prepared by directly dissolving the original synthesized peptide in pure water) exists in a β-sheet conformation, where the Gln side chains form hydrogen bonds to either the backbone or other Gln side chains. At 60 °C, these solutions readily form amyloid fibrils. We used the polyGln disaggregation protocol of Wetzel et al. [Wetzel, R., et al. (2006) Methods Enzymol.413, 34-74] to dissolve the Q10 β-sheet aggregates. We observe that the disaggregated Q10 (DQ10) solutions adopt PPII-like and 2.5(1)-helix conformations where the Gln side chains form hydrogen bonds with water. In contrast, these samples do not form fibrils. The NDQ10 β-sheet solution structure is essentially identical to that found in the NDQ10 solid formed upon evaporation of the solution. The DQ10 PPII and 2.5(1)-helix solution structure is essentially identical to that in the DQ10 solid. Although the NDQ10 solution readily forms fibrils when heated, the DQ10 solution does not form fibrils unless seeded with the NDQ10 solution. This result demonstrates very high activation barriers between these solution conformations. The NDQ10 fibril secondary structure is essentially identical to that of the NDQ10 solution, except that the NDQ10 fibril backbone conformational distribution is narrower than in the dissolved species. The NDQ10 fibril Gln side chain geometry is more constrained than when NDQ10 is in solution. The NDQ10 fibril structure is identical to that of the DQ10 fibril seeded by the NDQ10 solution.
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Affiliation(s)
| | - David Punihaole
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, Phone: (412)624-8570
| | - Sanford A Asher
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, Phone: (412)624-8570
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Collins KD. Why continuum electrostatics theories cannot explain biological structure, polyelectrolytes or ionic strength effects in ion–protein interactions. Biophys Chem 2012; 167:43-59. [DOI: 10.1016/j.bpc.2012.04.002] [Citation(s) in RCA: 169] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 04/10/2012] [Accepted: 04/10/2012] [Indexed: 01/13/2023]
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Conformation of poly-L-glutamate is independent of ionic strength. Biophys Chem 2011; 162:1-5. [PMID: 22236769 DOI: 10.1016/j.bpc.2011.11.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2011] [Revised: 11/08/2011] [Accepted: 11/12/2011] [Indexed: 11/23/2022]
Abstract
CD and UV resonance Raman measurements surprisingly find that the charge screening of even 2 M concentrations of NaCl and KCl does not alter the unfolded PPII and 2.5(1)-helix conformations of poly-L-glutamate. These salts appear to be excluded from the region between the side chain charges and the peptide backbone. Furthermore, no direct ion pairing occurs between these salts and the side chain carboxylates.
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