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Slavkova Z, Yancheva D, Genova J. Phase behaviour and structural properties of SOPC model lipid system in a sucrose solution. Spectrochim Acta A Mol Biomol Spectrosc 2024; 304:123287. [PMID: 37633099 DOI: 10.1016/j.saa.2023.123287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 08/17/2023] [Accepted: 08/19/2023] [Indexed: 08/28/2023]
Abstract
Lipid membranes are an important component of the biological cell. The profound understanding of their structure and functionality, as well as, the influence of various biologically relevant admixtures on their main characteristics is of great importance for research and development in medicine and pharmacology. The effect of sugars on the behaviour of the membrane cell enjoys an ever-increasing interest as they are biologically significant substances. We have studied the influence of the disaccharide sucrose on the physicochemical properties of SOPC (1-stearoyl-2-oleoyl-sn- glycero-3-phosphocholine) lipid system aiming to gain better understanding of the mechanisms of the interaction between both substances. For that purpose, we have used differential scanning calorimetry and Fourier-transform infrared spectroscopy. Our results show that adding sugar up to 300 mM concentration substantially alters the thermodynamic and structural properties of SOPC. The DSC thermograms at heating reveal a general lowering of the SOPC transition temperature Tm from gel to liquid crystalline phase (main phase transition, ordered-disordered phase transition) in the presence of sugar. The corresponding peaks are smeared and harder to trace. In agreement with this, a gradual decrease of the enthalpy values up to 300 mM was measured. The IR spectroscopy study provided spectral evidence for two states of hydration of the phosphate groups in the sugar-SOPC model systems suggesting a mechanism of interaction where only part of the phospholipid headgroups are hydrogen bonded to the sugar molecules. The obtained results are in good agreement with various earlier data including results about the bending elasticity moduli, as well as, some theoretical simulations on the sugar-lipid interactions. The current results also reinforce the potential of sucrose to be used as a cell protector against drought at, both, high and low temperatures.
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Affiliation(s)
- Zdravka Slavkova
- G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussée blvd., 1784 Sofia, Bulgaria; Joint Institute for Nuclear Research, 6 Joliot-Curie St., Dubna, Moscow Region 141980, Russia
| | - Denitsa Yancheva
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Build. 9, 1113 Sofia, Bulgaria.
| | - Julia Genova
- G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussée blvd., 1784 Sofia, Bulgaria
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Mirzayev MN, Parau AC, Slavov L, Dinu M, Neov D, Slavkova Z, Popov EP, Belova M, Hasanov K, Aliyev FA, Vladescu (Dragomir) A. TiSiCN as Coatings Resistant to Corrosion and Neutron Activation. Materials (Basel) 2023; 16:1835. [PMID: 36902950 PMCID: PMC10003883 DOI: 10.3390/ma16051835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/15/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
The aim of the present paper was to evaluate the effect of neutron activation on TiSiCN carbonitrides coatings prepared at different C/N ratios (0.4 for under stoichiometric and 1.6 for over stoichiometric). The coatings were prepared by cathodic arc deposition using one cathode constructed of Ti88 at.%-Si12 at.% (99.99% purity). The coatings were comparatively examined for elemental and phase composition, morphology, and anticorrosive properties in 3.5% NaCl solution. All the coatings exhibited f.c.c. solid solution structures and had a (111) preferred orientation. Under stoichiometric structure, they proved to be resistant to corrosive attack in 3.5% NaCl and of these coatings the TiSiCN was found to have the best corrosion resistance. From all tested coatings, TiSiCN have proven to be the most suitable candidates for operation under severe conditions that are present in nuclear applications (high temperature, corrosion, etc.).
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Affiliation(s)
- Matlab N. Mirzayev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Institute of Radiation Problems, Azerbaijan National Academy of Sciences, AZ1143 Baku, Azerbaijan
- Scientific-Research Institute Geotecnological Problems of Oil, Gas and Chemistry, Azerbaijan State Oil and Industry University, AZ1010 Baku, Azerbaijan
- Innovation & Research Center, Western Caspian University, AZ1001 Baku, Azerbaijan
| | - Anca C. Parau
- National Institute of Research and Development for Optoelectronics INOE 2000, 409 Atomistilor St., 77125 Magurele, Romania
| | - Lyubomir Slavov
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
| | - Mihaela Dinu
- National Institute of Research and Development for Optoelectronics INOE 2000, 409 Atomistilor St., 77125 Magurele, Romania
| | - Dimitar Neov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Institute of Solid-State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
| | - Zdravka Slavkova
- Institute of Solid-State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
| | - Evgeni P. Popov
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Institute of Solid-State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
- Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
| | - Maria Belova
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
| | - Kanan Hasanov
- Institute of Radiation Problems, Azerbaijan National Academy of Sciences, AZ1143 Baku, Azerbaijan
| | - Fuad A. Aliyev
- Joint Institute for Nuclear Research, 141980 Dubna, Russia
- Institute of Geology and Geophysics of Azerbaijan, National Academy of Sciences, AZ1143 Baku, Azerbaijan
| | - Alina Vladescu (Dragomir)
- National Institute of Research and Development for Optoelectronics INOE 2000, 409 Atomistilor St., 77125 Magurele, Romania
- Physical Materials Science and Composite Materials Centre, Research School of Chemistry & Applied Biomedical Sciences, National Research Tomsk Polytechnic University, 30 Lenina Avenue, 634050 Tomsk, Russia
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Santhosh PB, Genova J, Slavkova Z, Chamati H. Influence of melatonin on the structural and thermal properties of SOPC lipid membranes. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Genova J, Chamati H, Slavkova Z, Petrov M. Differential Scanning Calorimetric Study of the Effect of Cholesterol on the Thermotropic Phase Behavior of the Phospholipid 1‐Stearoyl‐2‐Oleoyl‐sn‐Glycero‐3‐Phosphocholine. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12289] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Julia Genova
- Acad. G. Nadjakov Institute of Solid State PhysicsBulgarian Academy of Sciences Sofia Bulgaria
| | - Hassan Chamati
- Acad. G. Nadjakov Institute of Solid State PhysicsBulgarian Academy of Sciences Sofia Bulgaria
| | - Zdravka Slavkova
- Acad. G. Nadjakov Institute of Solid State PhysicsBulgarian Academy of Sciences Sofia Bulgaria
| | - Minko Petrov
- Acad. G. Nadjakov Institute of Solid State PhysicsBulgarian Academy of Sciences Sofia Bulgaria
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