Nanohydroxyapatite effects on polyesters-based membranes for bone applications

Author(s)

Pereira Mendonca, Lucia Helena ; Najar Lopes, Eder Socrates ; Pereira Rodrigues, Isabella Caroline ; de Oliveira, Mateus Franco ; Gabriel, Lais Pellizzer

• Document type: Journal article
• Source: JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T; v. 20, p. 8-pg., 2022-09-08.

Abstract

Tissue-engineered scaffolds are considered a promising strategy for repairing damaged bone tissues. Further, rotary jet spinning (RJS) is an attractive technique for fabricating fibrous scaffolds. Polycaprolactone (PCL), poly L-lactic acid (PLLA), and polyurethane (PU) are bioabsorbable polyester polymers that are widely studied as bone scaffolds. Addi-tionally, hydroxyapatite (HA) is an osteoconductive ceramic that mimics inorganic bone. In this study, RJS fibrous scaffolds were produced based on PCL, PLLA, and PU, and the in-fluence of the addition of HA nanoparticles was evaluated. The scaffolds morphology was characterized using scanning electron microscopy (SEM), which showed a reduction in the fiber diameter for all polymers after the HA addition and a smaller diameter of fibers for PCL. Fourier-transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) confirmed the presence of HA in the composites. Moreover, thermogravimetric analysis (TGA) showed high thermal stability of HA in the composites, in which PCL-HA presented greater thermal stability than the other composites. The addition of HA increased the in vitro degradation rates of the scaffolds, in which PLLA and PU exhibited higher degradation rates than PCL. Thus, HA addition can produce bioactive fibers and modulate the thermal stability, wettability, and in vitro degradation of polymers for different bone applications.(c) 2022 Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). (AU)

• FAPESP's process: 20/07923-0 - Development of bioactive bioinks and production of bioabsorbable custom scaffolds by additive manufacturing and rotary jet spinning to bone tissue repair
• Grantee: Laís Pellizzer Gabriel
• Support Opportunities: Regular Research Grants