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Mejri MZ, Aschi A. Evaluation of properties and structural transitions of Poly (2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylonitrile) / β-Galactosidase complex coacervates: effects of pH and aging. Colloids Surf B Biointerfaces 2022; 217:112627. [PMID: 35724598 DOI: 10.1016/j.colsurfb.2022.112627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 05/17/2022] [Accepted: 06/10/2022] [Indexed: 11/29/2022]
Abstract
The coacervates of the Poly (2-acrylamido-2-methyl-1-propanesulfonic acid-co-acrylonitrile) / β-Galactosidase complex are characterized using several techniques (Turbidimetry, dynamic and static light scattering (DLS / SLS), optical microscopy, image dynamic light scattering (IDLS), and ultra-small angles light scattering (USALS)). Turbidity and SLS were used to accurately determine the critical pHs of complex formation (pHc, pHϕ1, pHopt, and pHϕ2), DLS was used to probe the microscopic structure of coacervate droplets rich in proteins and polyelectrolytes in liquid-liquid phase separation, and IDLS and USALS have been introduced to better understand, during aging, the topology of the network formed of materials based on fractals in the dense phase. Observations of the architecture, the spatial inhomogeneity, and the size distributions of liquid complex coacervate droplets and fractal solid precipitates, were performed by optical microscopy. The pair-distance distribution function, P(r), presented in this review, is a new methodology of calculus for determining with precision the radius of gyration Rg of droplets coacervates. These techniques show that aging improves the stability of swollen condensates, the growth of the coacervate droplets is due to the attractive electrostatic interactions within the complex and does not undergo Ostwald ripening, except for the case of pHopt and having fractal dimensions Df generated by diffusion-limited cluster aggregation (DLCA).
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Affiliation(s)
- Mohamed Zied Mejri
- Université de Tunis El Manar, Faculté des Sciences de Tunis, LR99ES16 Laboratoire Physique de la Matière Molle et de la Modélisation Électromagnétique, 2092 Tunis, Tunisia
| | - Adel Aschi
- Université de Tunis El Manar, Faculté des Sciences de Tunis, LR99ES16 Laboratoire Physique de la Matière Molle et de la Modélisation Électromagnétique, 2092 Tunis, Tunisia.
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Hergli E, Aschi A. Polycation-globular protein complex: Ionic strength and chain length effects on the structure and properties. E-POLYMERS 2019. [DOI: 10.1515/epoly-2019-0014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThe effect of high salt concentration and pH on the binding of globular protein to polycation at different molar masses has been investigated by dynamic light scattering (DLS), turbidimetry and electrostatic modeling for the protein. In dilute concentration regime, DLS and pH titrations showed three remarkable pH transitions: pHc, the pH where soluble complexes of bovine serum albumin (BSA) and linear synthetic Polyethylenemine (PEI) are formed, pHc’ presents the end of primary soluble complex and pHφ presents the first appearance of microcoacervate droplets. All pH transitions increase with increasing NaCl concentration. The Adaptive Poisson-Boltzmann Solver (APBS) identify with precision the functional sites at the surface of BSA and shows that the strength of electrostatic interactions depends hugely on the variation of pH and ionic strength. At a very high concentration of salt, no remarkable effect on a mixture formed of a long chain of polycation and globular protein.
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Affiliation(s)
- Eya Hergli
- Université de Tunis El Manar, Faculté des Sciences de Tunis, LR99ES16 Laboratoire Physique de la Matière Molle et de la Modélisation Électromagnétique, Tunis, 2092, Tunisia
| | - Adel Aschi
- Université de Tunis El Manar, Faculté des Sciences de Tunis, LR99ES16 Laboratoire Physique de la Matière Molle et de la Modélisation Électromagnétique, Tunis, 2092, Tunisia
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Othman M, Aschi A, Gharbi A. Polyacrylic acids–bovine serum albumin complexation: Structure and dynamics. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 58:316-23. [DOI: 10.1016/j.msec.2015.08.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 08/23/2015] [Accepted: 08/25/2015] [Indexed: 11/28/2022]
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A high-performance glucose biosensor using covalently immobilised glucose oxidase on a poly(2,6-diaminopyridine)/carbon nanotube electrode. Talanta 2013; 116:801-8. [DOI: 10.1016/j.talanta.2013.07.068] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 07/25/2013] [Accepted: 07/26/2013] [Indexed: 11/19/2022]
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Teles F, Fonseca L. Applications of polymers for biomolecule immobilization in electrochemical biosensors. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2008.04.010] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Libertino S, Giannazzo F, Aiello V, Scandurra A, Sinatra F, Renis M, Fichera M. XPS and AFM characterization of the enzyme glucose oxidase immobilized on SiO(2) surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:1965-1972. [PMID: 18205419 DOI: 10.1021/la7029664] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
A process to immobilize the enzyme glucose oxidase on SiO2 surfaces for the realization of integrated microbiosensors was developed. The sample characterization was performed by monitoring, step by step, oxide activation, silanization, linker molecule (glutaraldehyde) deposition, and enzyme immobilization by means of XPS, AFM, and contact angle measurements. The control of the environment during the procedure, to prevent silane polymerization, and the use of oxide activation to obtain a uniform enzyme layer are issues of crucial importance. The correct protocol application gives a uniform layer of the linker molecule and the maximum sample surface coverage. This result is fundamental for maximizing the enzyme bonding sites on the sample surface and achieving the maximum surface coverage. Thin SiO2 layers thermally grown on a Si substrate were used. The XPS Si 2p signal of the substrate was monitored during immobilization. Such a signal is not completely shielded by the thin oxide layer and it is fully suppressed after the completion of the whole protocol. A power spectral density analysis on the AFM measurements showed the crucial role of both the oxide activation and the intermediate steps (silanization and linker molecule deposition) to obtain uniform immobilized enzyme coverage. Finally, enzymatic activity measurements confirmed the suitability of the optimized protocol.
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Iucci G, Rossi L, Rosato N, Savini I, Duranti G, Polzonetti G. The interaction of the polyphenylacetylene surface with biological environments studied by XPS, RAIRS and biological tests. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2006; 17:779-87. [PMID: 16932858 DOI: 10.1007/s10856-006-9835-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2005] [Accepted: 10/21/2005] [Indexed: 05/11/2023]
Abstract
A pi-conjugated polymer, polyphenylacetylene or PPA, has been tested for its possible applications as biosensor or biomaterial. Protein adsorption was investigated by incubating PPA films in solutions of bovine serum albumin (BSA) dissolved in phosphate buffer (PBS) having increasing protein concentration. Investigations on the PPA films were carried out by means of two surface analysis techniques, X-ray photoelectron spectroscopy (XPS) and reflection-absorption infrared spectroscopy (RAIRS). Desorption of BSA from the PPA surface was also investigated. Finally, the cytototoxicity of the PPA surface was checked by measuring viability and proliferation of lymphoma macrophages and SAOS osteoblasts grown in the presence of the polymer.
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Affiliation(s)
- G Iucci
- Dipartimento di Fisica E. Amaldi, Universit à Roma Tre, Unità INFM, INSTM, and CISDiC, Via della Vasca Navale 84, 00146, Roma.
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Longo L, Vasapollo G, Guascito MR, Malitesta C. New insights from X-ray photoelectron spectroscopy into the chemistry of covalent enzyme immobilization, with glutamate dehydrogenase (GDH) on silicon dioxide as an example. Anal Bioanal Chem 2006; 385:146-52. [PMID: 16583206 DOI: 10.1007/s00216-006-0398-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2006] [Revised: 02/22/2006] [Accepted: 02/24/2006] [Indexed: 11/24/2022]
Abstract
A three-step process for immobilization of glutamate dehydrogenase (GDH) on the surface of silicon dioxide has been studied by X-ray photoelectron spectroscopy (XPS). The enzyme layer was deposited on the silicon dioxide surface after first exposing the surface to 3-aminopropyltriethoxysilane (3-APTS) and reacting the silylated surface with glutaraldehyde (GA). Fine XPS analysis, performed after each step of the chemical procedure, revealed unknown details of the step-by-step construction of the enzyme layer under different experimental conditions.
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Affiliation(s)
- Luigia Longo
- Dipartimento di Ingegneria dell'Innovazione, Università di Lecce, via Arnesano, 73100 Lecce, Italy
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Jeon J, Dobrynin AV. Molecular Dynamics Simulations of Polyampholyte−Polyelectrolyte Complexes in Solutions. Macromolecules 2005. [DOI: 10.1021/ma050303j] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Yuqing M, Jianrong C, Xiaohua W. Using electropolymerized non-conducting polymers to develop enzyme amperometric biosensors. Trends Biotechnol 2004; 22:227-31. [PMID: 15109808 DOI: 10.1016/j.tibtech.2004.03.004] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Miao Yuqing
- College of Chemistry and Life Science, Zhejiang Normal University, Jinhua 321004, China.
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Seyrek E, Dubin PL, Tribet C, Gamble EA. Ionic strength dependence of protein-polyelectrolyte interactions. Biomacromolecules 2003; 4:273-82. [PMID: 12625722 DOI: 10.1021/bm025664a] [Citation(s) in RCA: 327] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of univalent electrolyte concentration on protein-polyelectrolyte complex formation has been measured by frontal analysis continuous capillary electrophoresis (FACCE) and turbidimetry for the interaction of bovine serum albumin (BSA) with a synthetic hydrophobically modified polyacid, for BSA with (porcine mucosal) heparin (Hp), a highly charged polyanion, and for Hp and insulin. All three highly diverse systems display maxima or plateaus in complex formation in the range of ionic strength 5 < I < 30 mM, confirmed in the case of BSA-Hp by multiple techniques. Similar maxima are reported in the literature, but with little discussion, for BSA-poly(dimethyldiallylammonium chloride), lysozyme-hyaluronic acid, and lysozyme-chondroitin sulfate, always in the I range 5-30 mM. While inversion of salt effect has been discussed specifically for the interaction of gelatin and sodium polystyrenesulfonate with gelatin(28) and with beta-lactoglobulin,(10) the general nature of this phenomenon, regardless of polyelectrolyte origin, molecular weight, and charge sign has not been recognized. The position of the maxima and their occurrence when protein and polyelectrolyte have the same net charge imply that they arise when Debye lengths extend, at low I, beyond half the protein diameter so that addition of salt screens repulsions, as well as attractions. This appears to be a general effect caused by electrostatic repulsions that can coexist simultaneously with hydrophobic interactions. Modeling of protein electrostatics via Delphi is used to visualize this effect for BSA, lysozyme, insulin, and beta-lactoglobulin.
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Affiliation(s)
- Emek Seyrek
- Department of Chemistry, Indiana University-Purdue University at Indianapolis, 402 N. Blackford Street, Indiana 46202, USA
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Li XG, Huang MR, Duan W, Yang YL. Novel multifunctional polymers from aromatic diamines by oxidative polymerizations. Chem Rev 2002; 102:2925-3030. [PMID: 12222980 DOI: 10.1021/cr010423z] [Citation(s) in RCA: 393] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xin-Gui Li
- Department of Polymer Materials Science and Engineering, State Key Laboratory of Concrete Materials Research, College of Materials Science and Engineering, Tongji University, Shanghai, PR China.
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A molecular resolution AFM study of gold-adsorbed glucose oxidase as influenced by enzyme concentration. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(98)00036-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Characterising the formation of a bioelectrochemical interface at a self-assembled monolayer using X-ray photoelectron spectroscopy. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0302-4598(96)05173-2] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Griffith A, Glidle A, Beamson G, Cooper JM. Determination of the Biomolecular Composition of an Enzyme−Polymer Biosensor. J Phys Chem B 1997. [DOI: 10.1021/jp9633456] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alun Griffith
- Bioelectronics Research Centre, Department of Electronics, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Andrew Glidle
- Bioelectronics Research Centre, Department of Electronics, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Graham Beamson
- Bioelectronics Research Centre, Department of Electronics, University of Glasgow, Glasgow G12 8QQ, U.K
| | - Jonathan M. Cooper
- Bioelectronics Research Centre, Department of Electronics, University of Glasgow, Glasgow G12 8QQ, U.K
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