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Benavides T, Guerra J, Garcia C. Dielectric Spectroscopy can Predict the Effect of External AC Fields on the Dynamic Adsorption of Lysozyme. Chemphyschem 2022; 23:e202100914. [PMID: 35226788 PMCID: PMC9311058 DOI: 10.1002/cphc.202100914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/25/2022] [Indexed: 11/08/2022]
Abstract
This report describes the application of dielectric spectroscopy as a simple and fast way to guide protein adsorption experiments. Specifically, the polarization behavior of a layer of adsorbed lysozyme was investigated using a triangular‐wave signal with frequencies varying from 0.5 to 2 Hz. The basic experiment, which can be performed in less than 5 min and with a single sample, not only allowed confirming the susceptibility of the selected protein towards the electric signal but also identified that this protein would respond more efficiently to signals with lower frequencies. To verify the validity of these observations, the adsorption behavior of lysozyme onto optically transparent carbon electrodes was also investigated under the influence of an applied alternating potential. In these experiments, the applied signal was defined by a sinusoidal wave with an amplitude of 100 mV and superimposed to +800 mV (applied as a working potential) and varying the frequency in the 0.1–10000 Hz range. The experimental data showed that the greatest adsorbed amounts of lysozyme were obtained at the lowest tested frequencies (0.1–1.0 Hz), results that are in line with the corresponding dielectric features of the protein.
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Affiliation(s)
- Tomas Benavides
- Universidad Nacional de Córdoba: Universidad Nacional de Cordoba, Physical-Chemistry, ARGENTINA
| | - Jose Guerra
- Federal University of Uberlandia: Universidade Federal de Uberlandia, physics, BRAZIL
| | - Carlos Garcia
- Clemson University, Chemistry, 211 S. Palmetto Blvd, 29634, Clemson, UNITED STATES
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Pettian MS, Plepis AMDG, Martins VDCA, dos Santos GR, Pinto CAL, Galdeano EA, Calegari ARA, de Moraes CA, da Cunha MR. Use of an anionic collagen matrix made from bovine intestinal serosa for in vivo repair of cranial defects. PLoS One 2018; 13:e0197806. [PMID: 30001321 PMCID: PMC6042682 DOI: 10.1371/journal.pone.0197806] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2018] [Accepted: 05/09/2018] [Indexed: 12/15/2022] Open
Abstract
Polymeric biomaterials composed of extracellular matrix components possess osteoconductive capacity that is essential for bone healing. The presence of collagen and the ability to undergo physicochemical modifications render these materials a suitable alternative in bone regenerative therapies. The objective of this study was to evaluate the osteogenic capacity of collagen-based matrices (native and anionic after alkaline hydrolysis) made from bovine intestinal serosa (MBIS). Twenty-five animals underwent surgery to create a cranial defect to be filled with native and anionic collagen matrixes, mmineralized and non mineralized. The animals were killed painlessly 6 weeks after surgery and samples of the wound area were submitted to routine histology and morphometric analysis. In the surgical area there was new bone formation projecting from the margins to the center of the defect. More marked bone neoformation occurred in the anionic matrices groups in such a way that permitted union of the opposite margins of the bone defect. The newly formed bone matrix exhibited good optical density of type I collagen fibers. Immunoexpression of osteocalcin by osteocytes was observed in the newly formed bone. Morphometric analysis showed a greater bone volume in the groups receiving the anionic matrices compared to the native membranes. Mineralization of the biomaterial did not increase its osteoregenerative capacity. In conclusion, the anionic matrix exhibits osteoregenerative capacity and is suitable for bone reconstruction therapies.
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Affiliation(s)
- Mariane Silva Pettian
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
| | - Ana Maria de Guzzi Plepis
- Interunit Postgraduate Program in Bioengineering, University of São Paulo, USP, São Carlos-SP, Brazil
- Institute of Chemistry of São Carlos, University of São Paulo, USP, São Carlos-SP, Brazil
| | | | - Geovane Ribeiro dos Santos
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
| | - Clovis Antônio Lopes Pinto
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
- Department of Anatomical Pathology, A.C. Camargo Cancer Center, São Paulo, SP, Brazil
| | - Ewerton Alexandre Galdeano
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
| | | | - Carlos Alberto de Moraes
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
| | - Marcelo Rodrigues da Cunha
- Department of Morphology and Pathology, Faculty of Medicine of Jundiaí, São Paulo, Brazil, Jundiaí –SP, Brazil
- Interunit Postgraduate Program in Bioengineering, University of São Paulo, USP, São Carlos-SP, Brazil
- * E-mail:
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