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D'Angelo G, Nibali VC, Wanderlingh U, Branca C, De Francesco A, Sacchetti F, Petrillo C, Paciaroni A. Multiple Interacting Collective Modes and Phonon Gap in Phospholipid Membranes. J Phys Chem Lett 2018; 9:4367-4372. [PMID: 30024172 DOI: 10.1021/acs.jpclett.8b01658] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We combine Brillouin neutron scattering measurements with recent inelastic X-ray scattering [ Zhernenkov et al. Nat. Commun. 2016 , 7 , 11575 ] to propose a model for the collective dynamics of phospholipid bilayers. Neutron and X-ray spectra were fitted by the model response function associated with the Hamiltonian of an interacting-phonon system. This approach allows for a comprehensive and unprecedented picture of the vibrational collective features of phospholipids. At low wavevectors Q, the dispersion relations can be interpreted in terms of two acoustic-like modes, one longitudinal and one transverse, plus a dispersionless optic-like mode. The transverse mode of the liquid phase shows a phonon gap that can be linked to a passive transport mechanism through membranes, an interpretation that was proposed in Zhernenkov et al. At higher Q values, the interaction of the longitudinal acoustic excitation with the dispersionless mode gives rise to a pattern that is consistent with avoided-crossing behavior. Evidence is found for a slow- to fast-sound transition, similar to bulk water and other biomolecules.
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Affiliation(s)
- Giovanna D'Angelo
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra , Universitá degli Studi di Messina , Viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Valeria Conti Nibali
- Lehrstuhl fur Physikalische Chemie II , Ruhr Universitat , 44801 Bochum , Germany
| | - Ulderico Wanderlingh
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra , Universitá degli Studi di Messina , Viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Caterina Branca
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra , Universitá degli Studi di Messina , Viale F. Stagno d'Alcontres 31 , 98166 Messina , Italy
| | - Alessio De Francesco
- Consiglio Nazionale delle Ricerche , Istituto Officina dei Materiali OGG, c/o Institut Laue Langevin , 71 Ave. des Martyrs , BP 156 F-38042 Grenoble Cedex , France
| | - Francesco Sacchetti
- Dipartimento di Fisica e Geologia , Universitá degli Studi di Perugia , Via Pascoli , 06123 Perugia , Italy
| | - Caterina Petrillo
- Dipartimento di Fisica e Geologia , Universitá degli Studi di Perugia , Via Pascoli , 06123 Perugia , Italy
| | - Alessandro Paciaroni
- Dipartimento di Fisica e Geologia , Universitá degli Studi di Perugia , Via Pascoli , 06123 Perugia , Italy
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Amann-Winkel K, Bellissent-Funel MC, Bove LE, Loerting T, Nilsson A, Paciaroni A, Schlesinger D, Skinner L. X-ray and Neutron Scattering of Water. Chem Rev 2016; 116:7570-89. [DOI: 10.1021/acs.chemrev.5b00663] [Citation(s) in RCA: 137] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katrin Amann-Winkel
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | | | - Livia E. Bove
- IMPMC, CNRS-UMR 7590, Université P&M Curie, 75252 Paris, France
- Institute
of Condensed Matter Physics, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Thomas Loerting
- Institute
of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria
| | - Anders Nilsson
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | - Alessandro Paciaroni
- Dipartimento
di Fisica e Geologia, Università di Perugia, Via Alessandro
Pascoli, I-06123 Perugia, Italy
| | - Daniel Schlesinger
- Department
of Physics, AlbaNova University Center, Stockholm University, SE-106
91, Stockholm, Sweden
| | - Lawrie Skinner
- Mineral
Physics Institute, Stony Brook University, Stony Brook, New York 11794-2100, United States
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