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Zykova VA, Surovtsev NV. Brillouin Spectroscopy of Binary Phospholipid-Cholesterol Bilayers. APPLIED SPECTROSCOPY 2022; 76:1206-1215. [PMID: 35712869 DOI: 10.1177/00037028221111147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Multicomponent lipid bilayers are used as models for searching the origin of spatial heterogeneities in biomembranes called lipid rafts, implying the coexistence of domains of different phases and compositions within the lipid bilayer. The spatial organization of multicomponent lipid bilayers on a scale of a hundred nanometers remains unknown. Brillouin spectroscopy providing information about the acoustic phonons with the wavelength of several hundred nanometers has an unexplored potential for this problem. Here, we applied Brillouin spectroscopy for three binary bilayers composed of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), 1,2-palmitoyl-sn-glycero-3-phosphocholine (DPPC), and cholesterol. The Brillouin experiment for the oriented planar multibilayers was realized for two scattering geometries involving phonons for the lateral and normal directions of the propagation. The DPPC-DOPC mixtures known for the coexistence of the solid-ordered and liquid-disordered phases had bimodal Brillouin peaks, revealing the phase domains with sizes more than a hundred nanometers. Analysis of the Brillouin data for the binary mixtures concluded that the lateral phonons are preferable for testing the lateral homogeneity of the bilayers, while the phonons spreading across the bilayers are sensitive to the layered packing at the mesoscopic scale.
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Affiliation(s)
- Valeria A Zykova
- 104673Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, Russia
| | - Nikolay V Surovtsev
- 104673Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, Russia
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Alunni Cardinali M, Di Michele A, Mattarelli M, Caponi S, Govoni M, Dallari D, Brogini S, Masia F, Borri P, Langbein W, Palombo F, Morresi A, Fioretto D. Brillouin-Raman microspectroscopy for the morpho-mechanical imaging of human lamellar bone. J R Soc Interface 2022; 19:20210642. [PMID: 35104431 PMCID: PMC8807060 DOI: 10.1098/rsif.2021.0642] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 12/21/2021] [Indexed: 12/12/2022] Open
Abstract
Bone has a sophisticated architecture characterized by a hierarchical organization, starting at the sub-micrometre level. Thus, the analysis of the mechanical and structural properties of bone at this scale is essential to understand the relationship between its physiology, physical properties and chemical composition. Here, we unveil the potential of Brillouin-Raman microspectroscopy (BRaMS), an emerging correlative optical approach that can simultaneously assess bone mechanics and chemistry with micrometric resolution. Correlative hyperspectral imaging, performed on a human diaphyseal ring, reveals a complex microarchitecture that is reflected in extremely rich and informative spectra. An innovative method for mechanical properties analysis is proposed, mapping the intermixing of soft and hard tissue areas and revealing the coexistence of regions involved in remodelling processes, nutrient transportation and structural support. The mineralized regions appear elastically inhomogeneous, resembling the pattern of the osteons' lamellae, while Raman and energy-dispersive X-ray images through scanning electron microscopy show an overall uniform distribution of the mineral content, suggesting that other structural factors are responsible for lamellar micromechanical heterogeneity. These results, besides giving an important insight into cortical bone tissue properties, highlight the potential of BRaMS to access the origin of anisotropic mechanical properties, which are almost ubiquitous in other biological tissues.
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Affiliation(s)
- M. Alunni Cardinali
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, Perugia 06123, Italy
| | - A. Di Michele
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, Perugia 06123, Italy
| | - M. Mattarelli
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, Perugia 06123, Italy
| | - S. Caponi
- Istituto Officina Dei Materiali, National Research Council (IOM-CNR), Unit of Perugia, c/o Department of Physics and Geology, University of Perugia, Via A. Pascoli, Perugia 06123, Italy
| | - M. Govoni
- Reconstructive Orthopaedic Surgery and Innovative Techniques – Musculoskeletal Tissue Bank, IRCCS Istituto Ortopedico Rizzoli, Via G.C. Pupilli 1, Bologna 40136, Italy
| | - D. Dallari
- Reconstructive Orthopaedic Surgery and Innovative Techniques – Musculoskeletal Tissue Bank, IRCCS Istituto Ortopedico Rizzoli, Via G.C. Pupilli 1, Bologna 40136, Italy
| | - S. Brogini
- Complex Structure of Surgical Sciences and Technologies, IRCCS Istituto Ortopedico Rizzoli, Via Di Barbiano 1/10, Bologna 40136, Italy
| | - F. Masia
- School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK
| | - P. Borri
- School of Biosciences, Cardiff University, Museum Avenue, Cardiff CF10 3AX, UK
| | - W. Langbein
- School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK
| | - F. Palombo
- School of Physics and Astronomy, University of Exeter, Exeter EX4 4QL, UK
| | - A. Morresi
- Department of Chemistry, Biology and Biotechnology, University of Perugia, Via Elce di Sotto 8, Perugia 06123, Italy
| | - D. Fioretto
- Department of Physics and Geology, University of Perugia, Via A. Pascoli, Perugia 06123, Italy
- CEMIN - Center of Excellence for Innovative Nanostructured Material, Via Elce di Sotto 8, Perugia 06123, Italy
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