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Ordóñez-Chávez GDC, Rodríguez-Fuentes N, Peñaloza-Cuevas R, Cervantes-Uc JM, Alcántara-Quintana LE, Maya-García IA, Herrera-Valencia VA, Mendiburu-Zavala CE. In vitro evaluation of crosslinked bovine pericardium as potential scaffold for the oral cavity. Biomed Mater Eng 2023; 34:561-575. [PMID: 37545206 PMCID: PMC10657658 DOI: 10.3233/bme-230027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 07/27/2023] [Indexed: 08/08/2023]
Abstract
BACKGROUND Bovine pericardium (BP) is a scaffold widely used in soft tissues regeneration; however, its calcification in contact with glutaraldehyde, represent an opportunity for its application in hard tissues, such as bone in the oral cavity. OBJECTIVE To develop and to characterize decellularized and glutaraldehyde-crosslinked bovine pericardium (GC-BP) as a potential scaffold for guided bone regeneration GBR. METHODS BP samples from healthy animals of the bovine zebu breed were decellularized and crosslinked by digestion with detergents and glutaraldehyde respectively. The resulting cell-free scaffold was physical, chemical, mechanical, and biologically characterized thought hematoxylin and eosin staining, DNA quantification, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), uniaxial tensile test, cell viability and live and dead assay in cultures of dental pulp stem cells (DPSCs). RESULTS The decellularization and crosslinking of BP appeared to induce conformational changes of the CLG molecules, which led to lower mechanical properties at the GC-BP scaffold, at the same time that promoted cell adhesion and viability of DPSCs. CONCLUSION This study suggests that the decellularized and GC-BP is a scaffold with the potential to be used promoting DPSCs recruitment, which has a great impact on the dental area.
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Affiliation(s)
| | - Nayeli Rodríguez-Fuentes
- CONACYT-Centro de Investigación Científica de Yucatán, Yucatan, Mexico
- Centro de Investigación Científica de Yucatán, Yucatan, Mexico
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2
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Kruk D, Masiewicz E, Wojciechowski M, Florek-Wojciechowska M, Broche LM, Lurie DJ. Slow dynamics of solid proteins - Nuclear magnetic resonance relaxometry versus dielectric spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2020; 314:106721. [PMID: 32276108 DOI: 10.1016/j.jmr.2020.106721] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 03/17/2020] [Accepted: 03/18/2020] [Indexed: 06/11/2023]
Abstract
1H Nuclear Magnetic Resonance (NMR) relaxometry and Dielectric Spectroscopy (DS) have been exploited to investigate the dynamics of solid proteins. The experiments have been carried out in the frequency range of about 10 kHz-40 MHz for NMR relaxometry and 10-2Hz-20 MHz for DS. The data sets have been analyzed in terms of theoretical models allowing for a comparison of the correlation times revealed by NMR relaxometry and DS. The 1H spin-lattice relaxation profiles have been decomposed into relaxation contributions associated with 1H-1H and 1H-14N dipole - dipole interactions. The 1H-1H relaxation contribution has been interpreted in terms of three dynamical processes of time scales of 10-6s, 10-7s and 10-8s. It has turned out that the correlation times do not differ much among proteins and they are only weakly dependent on temperature. The analysis of DS relaxation spectra has also revealed three motional processes characterized by correlation times that considerably depend on temperature in contrast to those obtained from the 1H relaxation. This finding suggest that for solid proteins there is a contribution to the 1H spin-lattice relaxation associated with a kind of motion that is not probed in DS as it does not lead to a reorientation of the electric dipole moment.
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Affiliation(s)
- Danuta Kruk
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Słoneczna 54, 10-710 Olsztyn, Poland.
| | - Elzbieta Masiewicz
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Słoneczna 54, 10-710 Olsztyn, Poland
| | - Milosz Wojciechowski
- Faculty of Mathematics and Computer Science, University of Warmia & Mazury in Olsztyn, Słoneczna 54, 10-710 Olsztyn, Poland
| | | | - Lionel M Broche
- Bio-Medical Physics, School of Medicine, Medical Sciences & Nutrition, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, United Kingdom
| | - David J Lurie
- Bio-Medical Physics, School of Medicine, Medical Sciences & Nutrition, University of Aberdeen, Foresterhill, Aberdeen AB25 2ZD, Scotland, United Kingdom
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Samouillan V, Tang R, Dandurand J, Lacabanne C, Lacoste-Ferré MH, Villaret A, Nadal-Wollbold F, Schmitt AM. Chain dynamics of human dermis by Thermostimulated currents: A tool for new markers of aging. Skin Res Technol 2018; 25:12-19. [PMID: 29797593 DOI: 10.1111/srt.12588] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2018] [Indexed: 11/28/2022]
Abstract
BACKGROUND/PURPOSE The purpose of this clinical study was to identify dielectric markers to complete a previous thermal and vibrational study on the molecular and organizational changes in human dermis during intrinsic and extrinsic aging. METHODS Sun-exposed and non-exposed skin biopsies were collected from 28 women devised in two groups (20-30 and ≥60 years old). The dielectric relaxation modes associated with localized and delocalized dynamics in the fresh and dehydrated state were determined by the Thermostimulated currents technique (TSC). RESULTS Intrinsic and extrinsic aging induced significant evolution of some of the dielectric parameters of localized and delocalized dynamics of human skin. With photo-aging, freezable water forms a segregated phase in dermis and its dynamics is close to free water, what evidences the major role of extrinsic aging on water organization in human skin. Moreover, TSC indicators highlight the restriction of localized mobility with intrinsic aging due to glycation, and the cumulative effect of chronological aging and photo-exposition on the molecular mobility of the main structural proteins of the dermis at the mesoscopic scale. CONCLUSION TSC is a well-suited technique to scan the molecular mobility of human skin. It can be uses as a relevant complement of vibrational and thermal characterization to follow human skin modifications with intrinsic and extrinsic aging.
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Affiliation(s)
- V Samouillan
- CIRIMAT UMR 5085, Université de Toulouse, Université Paul Sabatier, Toulouse, Cedex, France
| | - R Tang
- CIRIMAT UMR 5085, Université de Toulouse, Université Paul Sabatier, Toulouse, Cedex, France
| | - J Dandurand
- CIRIMAT UMR 5085, Université de Toulouse, Université Paul Sabatier, Toulouse, Cedex, France
| | - C Lacabanne
- CIRIMAT UMR 5085, Université de Toulouse, Université Paul Sabatier, Toulouse, Cedex, France
| | - M-H Lacoste-Ferré
- CIRIMAT UMR 5085, Université de Toulouse, Université Paul Sabatier, Toulouse, Cedex, France
| | - A Villaret
- Pierre Fabre Dermo-Cosmetique, Toulouse, Cedex, France
| | | | - A-M Schmitt
- Pierre Fabre Dermo-Cosmetique, Toulouse, Cedex, France
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4
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Ferraro V, Gaillard-Martinie B, Sayd T, Chambon C, Anton M, Santé-Lhoutellier V. Collagen type I from bovine bone. Effect of animal age, bone anatomy and drying methodology on extraction yield, self-assembly, thermal behaviour and electrokinetic potential. Int J Biol Macromol 2017; 97:55-66. [DOI: 10.1016/j.ijbiomac.2016.12.068] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Revised: 12/10/2016] [Accepted: 12/21/2016] [Indexed: 02/04/2023]
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5
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Pore structure and dielectric behaviour of the 3D collagen-DAC scaffolds designed for nerve tissue repair. Int J Biol Macromol 2016; 92:1298-1306. [DOI: 10.1016/j.ijbiomac.2016.08.029] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 08/03/2016] [Accepted: 08/08/2016] [Indexed: 12/21/2022]
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6
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Papaioannou A, Louis M, Dhital B, Ho HP, Chang EJ, Boutis GS. Quantitative comparison of structure and dynamics of elastin following three isolation schemes by 13C solid state NMR and MALDI mass spectrometry. BIOCHIMICA ET BIOPHYSICA ACTA 2015; 1854:391-401. [PMID: 25592991 PMCID: PMC4380551 DOI: 10.1016/j.bbapap.2014.12.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Revised: 12/23/2014] [Accepted: 12/29/2014] [Indexed: 10/24/2022]
Abstract
Methods for isolating elastin from fat, collagen, and muscle, commonly used in the design of artificial elastin based biomaterials, rely on exposing tissue to harsh pH levels and temperatures that usually denature many proteins. At present, a quantitative measurement of the modifications to elastin following isolation from other extracellular matrix constituents has not been reported. Using magic angle spinning (13)C NMR spectroscopy and relaxation methodologies, we have measured the modification in structure and dynamics following three known purification protocols. Our experimental data reveal that the (13)C spectra of the hydrated samples appear remarkably similar across the various purification methods. Subtle differences in the half maximum widths were observed in the backbone carbonyl suggesting possible structural heterogeneity across the different methods of purification. Additionally, small differences in the relative signal intensities were observed between purified samples. Lyophilizing the samples results in a reduction of backbone motion and reveals additional differences across the purification methods studied. These differences were most notable in the alanine motifs indicating possible changes in cross-linking or structural rigidity. The measured correlation times of glycine and proline moieties are observed to also vary considerably across the different purification methods, which may be related to peptide bond cleavage. Lastly, the relative concentration of desmosine cross-links in the samples quantified by MALDI mass spectrometry is reported.
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Affiliation(s)
- A Papaioannou
- The Graduate Center of the City University of New York, Department of Physics, New York, NY, USA
| | - M Louis
- York College of The City University of New York, Department of Chemistry, Jamaica, New York, USA
| | - B Dhital
- The Graduate Center of the City University of New York, Department of Physics, New York, NY, USA
| | - H P Ho
- York College of The City University of New York, Department of Chemistry, Jamaica, New York, USA; The Graduate Center of the City University of New York, Department of Chemistry, New York, NY, USA
| | - E J Chang
- York College of The City University of New York, Department of Chemistry, Jamaica, New York, USA; The Graduate Center of the City University of New York, Department of Chemistry, New York, NY, USA
| | - G S Boutis
- The Graduate Center of the City University of New York, Department of Physics, New York, NY, USA; The Graduate Center of the City University of New York, Department of Chemistry, New York, NY, USA; Brooklyn College, Physics Department, Brooklyn, New York, USA.
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7
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Pamfil D, Schick C, Vasile C. New Hydrogels Based on Substituted Anhydride Modified Collagen and 2-Hydroxyethyl Methacrylate. Synthesis and Characterization. Ind Eng Chem Res 2014. [DOI: 10.1021/ie5016848] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniela Pamfil
- Department
of Physical Chemistry of Polymers, “Petru Poni” Institute
of Macromolecular Chemistry, Romanian Academy, , 41 A, Grigore Ghica Vodă
Alley, 700487, Iaşi, Romania
| | - Christoph Schick
- Institute
of Physics, University of Rostock, Wismarsche Strasse 43-45, 18051, Rostock, Germany
| | - Cornelia Vasile
- Department
of Physical Chemistry of Polymers, “Petru Poni” Institute
of Macromolecular Chemistry, Romanian Academy, , 41 A, Grigore Ghica Vodă
Alley, 700487, Iaşi, Romania
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8
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Kanungo I, Fathima NN, Jonnalagadda RR, Unni Nair B. Elucidation of hydration dynamics of locust bean gum–collagen composites by impedance and thermoporometry. Carbohydr Polym 2014; 103:250-60. [DOI: 10.1016/j.carbpol.2013.12.051] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 12/09/2013] [Accepted: 12/14/2013] [Indexed: 10/25/2022]
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9
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Panagopoulou A, Kyritsis A, Vodina M, Pissis P. Dynamics of uncrystallized water and protein in hydrated elastin studied by thermal and dielectric techniques. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2013; 1834:977-88. [DOI: 10.1016/j.bbapap.2013.03.015] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2013] [Revised: 03/15/2013] [Accepted: 03/16/2013] [Indexed: 11/24/2022]
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10
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Kandamchira A, Kanungo I, Fathima NN. Dielectric behaviour and conformational stability of collagen on interaction with DNA. Int J Biol Macromol 2012; 51:635-9. [DOI: 10.1016/j.ijbiomac.2012.06.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 06/25/2012] [Accepted: 06/26/2012] [Indexed: 11/29/2022]
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11
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Manikoth R, Kanungo I, Fathima NN, Rao JR. Dielectric behaviour and pore size distribution of collagen–guar gum composites: Effect of guar gum. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2012.01.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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12
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Bozec L, Odlyha M. Thermal denaturation studies of collagen by microthermal analysis and atomic force microscopy. Biophys J 2011; 101:228-36. [PMID: 21723833 PMCID: PMC3127184 DOI: 10.1016/j.bpj.2011.04.033] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 03/30/2011] [Accepted: 04/14/2011] [Indexed: 10/18/2022] Open
Abstract
The structural properties of collagen have been the subject of numerous studies over past decades, but with the arrival of new technologies, such as the atomic force microscope and related techniques, a new era of research has emerged. Using microthermal analysis, it is now possible to image samples as well as performing localized thermal measurements without damaging or destroying the sample itself. This technique was successfully applied to characterize the thermal response between native collagen fibrils and their denatured form, gelatin. Thermal transitions identified at (150 ± 10)°C and (220 ± 10)°C can be related to the process of gelatinization of the collagen fibrils, whereas at higher temperatures, both the gelatin and collagen samples underwent two-stage transitions with a common initial degradation temperature at (300 ± 10)°C and a secondary degradation temperature of (340 ± 10)°C for the collagen and of (420 ± 10)°C for the gelatin, respectively. The broadening and shift in the secondary degradation temperature was linked to the spread of thermal degradation within the gelatin and collagen fibrils matrix further away from the point of contact between probe and sample. Finally, similar measurements were performed inside a bone resorption lacuna, suggesting that microthermal analysis is a viable technique for investigating the thermomechanical response of collagen for in situ samples that would be, otherwise, too challenging or not possible using bulk techniques.
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Affiliation(s)
- Laurent Bozec
- Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London, United Kingdom.
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13
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Samouillan V, Tintar D, Lacabanne C. Hydrated elastin: Dynamics of water and protein followed by dielectric spectroscopies. Chem Phys 2011. [DOI: 10.1016/j.chemphys.2011.04.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Samouillan V, Dandurand J, Lacabanne C, Stella A, Gargiulo M, Degani A, Gandaglia A, Spina M. Characterization of aneurysmal aortas by biochemical, thermal, and dielectric techniques. J Biomed Mater Res A 2010; 95:611-9. [DOI: 10.1002/jbm.a.32835] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Marzec E, Pietrucha K. The effect of different methods of cross-linking of collagen on its dielectric properties. Biophys Chem 2007; 132:89-96. [PMID: 17997010 DOI: 10.1016/j.bpc.2007.10.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2007] [Revised: 10/20/2007] [Accepted: 10/22/2007] [Indexed: 02/02/2023]
Abstract
This paper reports on the effect of different methods of collagen cross-linking on its dielectric properties. In order to obtain collagen-hyaluronic acid (HA) scaffolds, collagen was first dehydrated by a combination of thermal and vacuum drying (DHT) and then treated with the chemical reagent carbodiimide (EDC/NHS) for final cross-linking. The measurements of the relative permittivity epsilon' and the dielectric loss epsilon'' for all materials were carried over the frequency range of 10 Hz-100 kHz and at temperatures from 22 to 260 degrees C. The results for these samples reveal distinct relaxation processes at low temperatures, below 140 degrees C and at higher temperatures as broad peak around 230 degrees C. The first and second relaxation are associated with changes in the secondary structure of collagen accompanied by the release of water and with the denaturation of dry collagen, respectively. The influence of cross-linking on the permittivity of collagen is significant over the entire temperature range.
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Affiliation(s)
- E Marzec
- Department of Biophysics, Poznań University of Medical Sciences, Poznań, Poland.
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16
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Fernandes RMT, Couto Neto RG, Paschoal CWA, Rohling JH, Bezerra CWB. Collagen films from swim bladders: preparation method and properties. Colloids Surf B Biointerfaces 2007; 62:17-21. [PMID: 17959363 DOI: 10.1016/j.colsurfb.2007.09.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2007] [Revised: 09/05/2007] [Accepted: 09/07/2007] [Indexed: 10/22/2022]
Abstract
This paper describes the preparation and characterization of collagen films extracted from swim bladders of three species of tropical fishes: Arius parkeri (Gurijuba), Cynoscion acoupa (Pescada Amarela) and Cynoscion leiarchus (Pescada Branca). Collagen was extracted under acidic conditions (CH(3)COOH, 2.5 pH) and precipitated by the addition of NaCl up to 3.0 mol L(-1). The films were prepared in acrylic containers and dried in a vacuum atmosphere. The collagen films were characterized by hydroxyproline contents, thermal analysis, scanning electron microscopy and impedance spectroscopy. The determined values of 4-hydroxiproline and collagens in the films were: 105.23+/-4.48 and 873.2; 102.94+/-4.42 and 854.1; 100.65+/-4.80 and 835.8 mg g(-1) for A. parkeri, C. acoupa and C. leiarchus, respectively. Differential scanning calorimetry revealed high denaturation temperature peaks at temperatures ranging from 65.9 to 74.8 degrees C. The micrographs showed no fibrillar organization along the material, but spongy structure, with cavity diameters relatively uniform, at around 2 microm. The impedance spectroscopy presented a distributed relaxation process. A. parkeri's films showed piezoelectricity.
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Affiliation(s)
- R M T Fernandes
- Departamento de Química, CCET, Universidade Federal do Maranhão, Avenida dos Portuguese s/n, Campus do Bacanga, São Luís, Maranhão, Brazil
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17
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Gun'ko VM, Zarko VI, Goncharuk EV, Andriyko LS, Turov VV, Nychiporuk YM, Leboda R, Skubiszewska-Zieba J, Gabchak AL, Osovskii VD, Ptushinskii YG, Yurchenko GR, Mishchuk OA, Gorbik PP, Pissis P, Blitz JP. TSDC spectroscopy of relaxational and interfacial phenomena. Adv Colloid Interface Sci 2007; 131:1-89. [PMID: 17188637 DOI: 10.1016/j.cis.2006.11.001] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 11/03/2006] [Accepted: 11/03/2006] [Indexed: 10/23/2022]
Abstract
Applications of thermally stimulated depolarisation current (TSDC) technique to a variety of systems with different dispersion phases such as disperse and porous metal oxides, polymers, liquid crystals, amorphous and crystalline solids, composites, solid solutions, biomacromolecules, cells, tissues, etc. in gaseous or liquid dispersion media are analysed. The effects of dipolar, direct current (dc) and space charge relaxations are linked to the temperature dependent mobility of molecules, their fragments, protons, anions, and electrons and depend on thermal treatment, temperature and field intensity of polarisation, heating rate on depolarisation or cooling rate on polarisation. Features of the relaxation mechanisms are affected not only by the mentioned factors but also by morphological, structural and chemical characteristics of materials. The interfacial phenomena, especially the role of interfacial water, received significant attention on analysis of the TSDC data. Comparison of the data of TSDC and dielectric relaxation spectroscopy (DRS), differential scanning calorimetry (DSC), 1H NMR spectroscopy with layer-by-layer freezing-out of bulk and interfacial water, adsorption/desorption of nitrogen, water and dissolved organics demonstrates high sensitivity and information content of the TSDC technique, allowing a deeper understanding of interfacial phenomena.
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Affiliation(s)
- V M Gun'ko
- Institute of Surface Chemistry, Kiev, Ukraine.
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18
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Yemini M, Xu P, Kaplan D, Rishpon J. Collagen-Like Peptide as a Matrix for Enzyme Immobilization in Electrochemical Biosensors. ELECTROANAL 2006. [DOI: 10.1002/elan.200603597] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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19
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Figueiró SD, Macêdo AAM, Melo MRS, Freitas ALP, Moreira RA, de Oliveira RS, Góes JC, Sombra ASB. On the dielectric behaviour of collagen–algal sulfated polysaccharide blends: Effect of glutaraldehyde crosslinking. Biophys Chem 2006; 120:154-9. [PMID: 16337076 DOI: 10.1016/j.bpc.2005.11.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Revised: 11/01/2005] [Accepted: 11/02/2005] [Indexed: 10/25/2022]
Abstract
In this paper, impedance measurements in the frequency range from 10(-2) to 10(6) Hz are presented for collagen and algal sulfated polysaccharide crosslinked films. We are considering the development of new biomaterials which have potential applications in coating of cardiovascular prostheses, support for cellular growth and in systems for controlled drug delivery. The effect of crosslink sulfated polysaccharide on the physical chemical properties of collagen was studied using FT-infrared spectroscopy, differential scanning calorimetry (DSC), dielectric spectroscopy. The resulting films crosslinked with glutaraldehyde (GA) in concentrations of 0.001% and 0.05% when analysed by DSC, showed that the GA treatment not only left the thermal stability of the collagen unaffected, but it also decreased the thermal transition energy. Dielectric spectroscopy shows that the effect of the crosslink on the blend film was associated to the decrease and stabilization of the dielectric permittivity at low frequencies and decreased its conductivity.
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Affiliation(s)
- S D Figueiró
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil
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Pietrucha K. Changes in denaturation and rheological properties of collagen-hyaluronic acid scaffolds as a result of temperature dependencies. Int J Biol Macromol 2006; 36:299-304. [PMID: 16102806 DOI: 10.1016/j.ijbiomac.2005.07.004] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2005] [Revised: 07/11/2005] [Accepted: 07/12/2005] [Indexed: 11/17/2022]
Abstract
This report describes the effect of temperature on the mechanical viscoelastic properties such as: storage modulus (E'), loss modulus (E''), and loss tangent (tandelta) of the collagen sponges modified with hyaluronic acid (HA). In order to detect collagen-HA copolymer denaturation and to assess its thermal stability, the differential scanning calorimetry (DSC) supplemented by thermogravimetric (TG) measurements was used. The denaturation temperature (T(d)) of unmodified collagen samples increased from 69 to 86 degrees C for cross-linked samples, respectively. These temperature dependencies show remarkable changes in E' and E'' at selected temperature up to 226 degrees C for all samples due to the release of loosely and strongly bound water. The influence of HA on the viscoelastic behavior of collagen is manifested by a shift of the tandelta peak associated with the process of decomposition towards higher temperatures resulting in a higher thermo-stability of the modified scaffolds.
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Affiliation(s)
- Krystyna Pietrucha
- Institute of Polymer & Dye Technology, Technical University of Łódź, Chemistry Department, Stefanowskiego 12/16, 90-924 Łódź, Poland.
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21
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Mijović J, Bian Y, Gross RA, Chen B. Dynamics of Proteins in Hydrated State and in Solution As Studied by Dielectric Relaxation Spectroscopy. Macromolecules 2005. [DOI: 10.1021/ma051854c] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jovan Mijović
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201
| | - Yu Bian
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201
| | - Richard A. Gross
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201
| | - Bo Chen
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six Metrotech Center, Brooklyn, New York 11201
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22
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Sun M, Pejanović S, Mijović J. Dynamics of Deoxyribonucleic Acid Solutions As Studied by Dielectric Relaxation Spectroscopy and Dynamic Mechanical Spectroscopy. Macromolecules 2005. [DOI: 10.1021/ma051596j] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mingyun Sun
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
| | - Srdjan Pejanović
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
| | - Jovan Mijović
- Othmer Department of Chemical and Biological Sciences and Engineering, Polytechnic University, Six MetroTech Center, Brooklyn New York 11201, and Department of Chemical Engineering, Faculty of Technology, University of Belgrade, Belgrade 11000, Serbia & Montenegro
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23
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Pietrucha K, Marzec E. Dielectric properties of the collagen–glycosaminoglycans scaffolds in the temperature range of thermal decomposition. Biophys Chem 2005; 118:51-6. [PMID: 16099587 DOI: 10.1016/j.bpc.2005.07.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2005] [Revised: 07/14/2005] [Accepted: 07/19/2005] [Indexed: 10/25/2022]
Abstract
Dielectric spectroscopy has been applied to study the decomposition process of unmodified collagen and chondroitin sulfate (CS)- and hyaluronic acid (HA)-modified collagen. Measurements were performed over the frequency range from 10 Hz to 100 kHz and at temperatures from 22 to 260 degrees C. According to the Kramers-Kronig relationship a dispersion is apparent in both epsilon' and epsilon'' for the three materials below 140 degrees C and at higher temperatures as a broad peak around 220-230 degrees C, respectively. The values of epsilon' and epsilon'' at the same temperature for constant frequency are higher in HA-modified collagen than in the unmodified collagen. However, small differences are shown in these parameters between CS-modified collagen and unmodified collagen. The observed dispersion around 220-230 degrees C corresponds to the decomposition of unmodified and CS- and HA-modified collagen. Power-low responses are observed for the frequency dependence of ac conductivity for unmodified and modified collagen. The behaviour observed for temperature dependencies of the exponent n for the three materials is considered to be related to the proton polarization and conduction processes.
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Affiliation(s)
- K Pietrucha
- Institute of Polimer and Dye Technology, Technical University of Łódź, Stefanowskiego 12/16, 90-924 Łódź, Poland
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24
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Abstract
Dielectric spectroscopy has been applied to study aspects of the organization of water in selected animal tissues (tendon, bone and horn). The measurements of the relative permittivity epsilon' and the dielectric loss epsilon'' were carried over the frequency range of 10-100 kHz and at temperatures from 22 to 240 degrees C. The water content was 10% for bone and horn, and 22% for tendon by mass at room temperature at a relative humidity of 70%. The temperature dependencies of epsilon' and epsilon'' reveal distinctively the temperature ranges corresponding to the release of water in temperatures up to about 200 degrees C for all tissues and the melting of the crystalline structure only for tendon and horn, above this temperature. The frequency dependencies of epsilon' and epsilon'' show a remarkable dispersion in the low-frequency at selected temperatures up to 200 degrees C for all tissues due to the release of the loosely and strongly bound water. The results were discussed in terms of the interfacial (Maxwell-Wagner) polarization and polarization mechanism involving hopping charge carriers interacting with the bound water molecules. The information on the effect of temperature, water content and frequency of the electromagnetic field on the dielectric behaviour of the tissues studied is of importance in the design and construction of medical diagnostic or therapeutic instruments based on the use of electric signals.
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Affiliation(s)
- E Marzec
- Department of Biophysics, Poznań University of Medical Sciences, Fredry 10, 61-701 Poznań, Poland.
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25
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Samouillan V, Dandurand J, Lacabanne C, Hornebeck W. Molecular mobility of elastin: effect of molecular architecture. Biomacromolecules 2002; 3:531-7. [PMID: 12005525 DOI: 10.1021/bm015655m] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thermal and dielectric properties of elastin and two soluble derivatives (kappa-elastin and derived elastin peptides from enzymatic elastolysis) were investigated in the freeze-dried state in a wide temperature range (from -180 to +220 degrees C). The glass transition of these amorphous proteins was studied by differential scanning calorimetry (DSC). The dielectric relaxations of both proteins were followed by thermally stimulated currents (TSC), an isochronal dielectric spectrometry running at variable temperature, analogous to a low-frequency spectroscopy (10(-3)-10(-2) Hz) and by dynamic dielectric spectroscopy (DDS), performed isothermally with the frequency varying from 10(-2) to 3 x 10(6) Hz. The combination of TSC and DDS experiments and the determination of the activation parameters of the relaxation times inform about the molecular mobility of the proteins, both in the glassy state and in the liquid state. Major differences between the relaxation behavior of elastin and its soluble derivatives have been discussed and correlated with the molecular architecture of the proteins.
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Affiliation(s)
- Valerie Samouillan
- Laboratoire de Physique des Polymères, Université Paul Sabatier, 31062 Toulouse Cedex 4, France.
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26
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Abstract
The importance of amorphous pharmaceutical solids lies in their useful properties, common occurrence, and physicochemical instability relative to corresponding crystals. Some pharmaceuticals and excipients have a tendency to exist as amorphous solids, while others require deliberate prevention of crystallization to enter and remain in the amorphous state. Amorphous solids can be produced by common pharmaceutical processes, including melt quenching, freeze- and spray-drying, milling, wet granulation, and drying of solvated crystals. The characterization of amorphous solids reveals their structures, thermodynamic properties, and changes (crystallization and structural relaxation) in single- and multi-component systems. Current research in the stabilization of amorphous solids focuses on: (i) the stabilization of labile substances (e.g., proteins and peptides) during processing and storage using additives, (ii) the prevention of crystallization of the excipients that must remain amorphous for their intended functions, and (iii) the selection of appropriate storage conditions under which amorphous solids are stable.
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Affiliation(s)
- L Yu
- Eli Lilly and Company, Lilly Research Laboratories, Lilly Corporate Center, DC3811, Indianapolis, IN 46285, USA.
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