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Secchi V, Franchi S, Dettin M, Zamuner A, Beranová K, Vladescu A, Battocchio C, Graziani V, Tortora L, Iucci G. Hydroxyapatite Surfaces Functionalized with a Self-Assembling Peptide: XPS, RAIRS and NEXAFS Study. NANOMATERIALS 2020; 10:nano10061151. [PMID: 32545421 PMCID: PMC7353169 DOI: 10.3390/nano10061151] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 06/07/2020] [Accepted: 06/09/2020] [Indexed: 11/16/2022]
Abstract
Hydroxyapatite (HAP) coatings can improve the biocompatibility and bioactivity of titanium alloys, such as Ti6Al4V, commonly used as material for orthopedic prostheses. In this framework, we have studied the surface of HAP coatings enriched with Mg and either Si or Ti deposited by RF magnetron sputtering on Ti6Al4V. HAP coatings have been furtherly functionalized by adsorption of a self-assembling peptide (SAP) on the HAP surface, with the aim of increasing the material bioactivity. The selected SAP (peptide sequence AbuEAbuEAbuKAbuKAbuEAbuEAbuKAbuK) is a self-complementary oligopeptide able to generate extended ordered structures by self-assembling in watery solutions. Samples were prepared by incubation of the HAP coatings in SAP solutions and subsequently analyzed by X-Ray Photoelectron Spectroscopy (XPS), Fourier Transform Infrared (FTIR) and Near Edge X-Ray Absorption Fine Structure (NEXAFS) spectroscopies, in order to determine the amount of adsorbed peptide, the peptide stability and the structure of the peptide overlayer on the HAP coatings as a function of the HAP substrate and of the pH of the mother SAP solution. Experimental data yielded evidence of SAP adsorption on the HAP surface, and peptide overlayers showed ordered structure and molecular orientation. The thickness of the SAP overlayer depends on the composition of the HAP coating.
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Affiliation(s)
- Valeria Secchi
- Department of Science, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy; (V.S.); (C.B.); (L.T.)
- Department of Materials Science, University of Milano-Bicocca, Via Cozzi 55, 20125 Milan, Italy
| | - Stefano Franchi
- Department of Science, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy; (V.S.); (C.B.); (L.T.)
- Institute of Structure of Matter (ISM), National Research Council (CNR), Via Fosso del Cavaliere 100, 00133 Rome, Italy
- Correspondence: (S.F.); (G.I.)
| | - Monica Dettin
- Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padua, Italy; (M.D.); (A.Z.)
| | - Annj Zamuner
- Department of Industrial Engineering, University of Padua, Via Marzolo 9, 35131 Padua, Italy; (M.D.); (A.Z.)
| | - Klára Beranová
- Materials Science Beamline, Elettra Sincrotrone Trieste SCpA, Strada Statale 14, km 163.5, 34149 Basovizza-Trieste, Italy;
| | - Alina Vladescu
- Department for Advanced Surface Processing and Analysis by Vacuum Technologies, National Institute of Research and Development for Optoelectronics, 409 Atomistilor St., 077125 Magurele, Romania;
- Physical Materials Science and Composite Materials Centre, National Research Tomsk Polytechnic University, Lenin Avenue 43, 634050 Tomsk, Russia
| | - Chiara Battocchio
- Department of Science, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy; (V.S.); (C.B.); (L.T.)
| | - Valerio Graziani
- Surface Analysis Laboratory, INFN University Roma Tre, via della Vasca Navale 84, 00146 Rome, Italy;
| | - Luca Tortora
- Department of Science, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy; (V.S.); (C.B.); (L.T.)
- Surface Analysis Laboratory, INFN University Roma Tre, via della Vasca Navale 84, 00146 Rome, Italy;
| | - Giovanna Iucci
- Department of Science, Roma Tre University, Via della Vasca Navale 79, 00146 Rome, Italy; (V.S.); (C.B.); (L.T.)
- Correspondence: (S.F.); (G.I.)
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