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Evaluation of Microstructure and Mechanical Properties of a Ti10Mo8Nb Alloy for Biomedical Applications. METALS 2022. [DOI: 10.3390/met12071065] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The growth of the elderly population is urging for more suitable biomaterials to allow the performance of better surgical and implant procedures and accelerate the patient’s healing because the elderly are more vulnerable to orthopedic and dental problems. β-phase Ti alloys can improve the mechanical properties of implants by reducing their elastic modulus and, consequently, the effects of stress shielding within bones. Therefore, the objective of this article is to study a novel ternary β-phase alloy of Ti10Mo8Nb produced by an electric arc furnace and rotary forge. The microstructure and mechanical properties of the Ti10Mo8Nb alloy were investigated in order to evaluate its suitability for biomedical applications and compare its characteristics with those present in Ti-alloys commerced or widely researched for prosthetic purposes. A tensile test, Vickers microhardness test, use of microstructure of optical microscopy for examination of microstructure, X-ray diffraction and hemolysis analysis were carried out. Thus, the Ti10Mo8Nb alloy showed suitable properties for biomedical applications, as well as having the potential to reduce the possibility to occur stress shielding after prosthetic implantations, especially for orthopedics and dentistry.
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Demirci S, Sahiner M, Suner SS, Sahiner N. Improved Biomedical Properties of Polydopamine-Coated Carbon Nanotubes. MICROMACHINES 2021; 12:1280. [PMID: 34832691 PMCID: PMC8623995 DOI: 10.3390/mi12111280] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 10/17/2021] [Accepted: 10/19/2021] [Indexed: 11/21/2022]
Abstract
Carbon nanotubes (CNTs) due to their outstanding mechanical, thermal, chemical, and optical properties were utilized as a base material and were coated with polydopamine (PDA) (PDA@CNT) via the simple self-polymerization of dopamine (DA). Then, PDA@CNT coatings of up to five layers were examined for potential biomedical applications. The success of multiple coating of CNTs with PDA was confirmed via increased weight loss values with the increased number of PDA coatings of CNTs at 500 °C by thermogravimetric analysis. The surface area of bare CNTs was measured as 263.9 m2/g and decreased to 197.0 m2/g after a 5th coating with PDA. Furthermore, the antioxidant activities of CNT and PDA@CNTs were determined via total flavonoid content (TFC), total phenol content (TPC), and Fe(III)-reducing antioxidant power (FRAP) tests, revealing the increased antioxidant ability of PDA@CNTs with the increasing numbers of PDA coatings. Moreover, a higher inhibition percentage of the activity of the alpha-glucosidase enzyme with 95.1 ± 2.9% inhibition at 6 mg/mL PDA-1st@CNTs concentration was found. The CNT and PDA@CNTs exhibited blood compatibility, less than a 2.5% hemolysis ratio, and more than 85% blood clotting indexes. The minimum inhibition concentration (MIC) of PDA-5th@CNTs against E. coli and S. aureus bacteria was determined as 10 mg/mL.
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Affiliation(s)
- Sahin Demirci
- Department of Chemistry, Faculty of Sciences and Arts, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey; (S.D.); (S.S.S.)
- Nanoscience and Technology Research and Application Center, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey
| | - Mehtap Sahiner
- Faculty of Canakkale School of Applied Science, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey;
| | - Selin Sagbas Suner
- Department of Chemistry, Faculty of Sciences and Arts, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey; (S.D.); (S.S.S.)
| | - Nurettin Sahiner
- Department of Chemistry, Faculty of Sciences and Arts, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey; (S.D.); (S.S.S.)
- Faculty of Canakkale School of Applied Science, Canakkale Onsekiz Mart University, Terzioglu Campus, Canakkale 17100, Turkey;
- Department of Chemical and Biomolecular Engineering, University of South Florida, Tampa, FL 33620, USA
- Department of Ophthalmology, Morsani College of Medicine, University of South Florida, 12901 Bruce B Downs B. Downs Blv., MDC 21, Tampa, FL 33612, USA
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Ansari I, Singh P, Mittal A, Mahato RI, Chitkara D. 2,2-Bis(hydroxymethyl) propionic acid based cyclic carbonate monomers and their (co)polymers as advanced materials for biomedical applications. Biomaterials 2021; 275:120953. [PMID: 34218051 DOI: 10.1016/j.biomaterials.2021.120953] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 05/26/2021] [Accepted: 05/29/2021] [Indexed: 12/15/2022]
Abstract
Designing grafted biodegradable polymers with tailored multi-functional properties is one of the most researched fields with extensive biomedical applications. Among many biodegradable polymers, polycarbonates have gained much attention due to their ease of synthesis, high drug loading, and excellent biocompatibility profiles. Among various monomers, 2,2-bis(hydroxymethyl) propionic acid (bis-MPA) derived cyclic carbonate monomers have been extensively explored in terms of their synthesis as well as their polymerization. Since the late 90s, significant advancements have been made in the design of bis-MPA derived cyclic carbonate monomers as well as in their reaction schemes. Currently, bis-MPA derived polycarbonates have taken a form of an entire platform with a multitude of applications, the latest being in the field of nanotechnology, targeted drug, and nucleic acid delivery. The present review outlines an up to date developments that have taken place in the last two decades in the design, synthesis, and biomedical applications of bis-MPA derived cyclic carbonates and their (co)polymers.
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Affiliation(s)
- Imran Ansari
- Department of Pharmacy, Birla Institute of Technology and Science, Pilani (BITS Pilani), Vidya Vihar Campus, Pilani, 333 031, Rajasthan, India
| | - Prabhjeet Singh
- Department of Pharmacy, Birla Institute of Technology and Science, Pilani (BITS Pilani), Vidya Vihar Campus, Pilani, 333 031, Rajasthan, India
| | - Anupama Mittal
- Department of Pharmacy, Birla Institute of Technology and Science, Pilani (BITS Pilani), Vidya Vihar Campus, Pilani, 333 031, Rajasthan, India
| | - Ram I Mahato
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Deepak Chitkara
- Department of Pharmacy, Birla Institute of Technology and Science, Pilani (BITS Pilani), Vidya Vihar Campus, Pilani, 333 031, Rajasthan, India.
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