Coating of bioactive glasses with chitosan: The effects of the glass composition and coating method on the surface properties, including preliminary in vitro results

Author(s)

Spriano, S. ; Riccucci, G. ; Orlygsson, G. ; Ng, C. H. ; Verne, E. ; Sehn, F. P. ; de Oliveira, P. T. ; Ferraris, S.

• Document type: Journal article
• Source: SURFACE & COATINGS TECHNOLOGY; v. 470, p. 11-pg., 2023-10-15.

Abstract

Two bioactive glasses were coated with chitosan: SCNB belongs to the SiO2-CaO-Na2O system, and SCNA has the addition of Al2O3 to enhance chemical stability. Different coating methods were compared: direct physical attachment, surface activation through tresyl chloride, and polydopamine as a linker. The samples were char-acterized through SEM-EDS, contact angle measurements, FTIR, zeta potential titrations, tape tests, in vitro precipitation of hydroxylapatite (bioactivity), and cell cultures (RAW 264.7 and UMR-106) on some selected samples. Direct physical attachment (in acetic acid) or use of polydopamine allowed complete surface coverage, while it dropped to one-quarter on both glasses by using tresyl chloride. The coating had a contact angle of about 80 degrees and it well showed typical functional groups (FTIR). The coatings on SCNA were chemically and mechan-ically stable (classified as 4-5B by the tape tests, partially maintained after soaking for 14 days), and showed an isoelectric point around 8. On SCNB, the coatings were unstable (classified as 0-3B, dissolved during soaking) but bioactivity was preserved. The coating affected the biological outcome of SCNA with M0/M1 polarization (1 day) and reduced viability of macrophages (3 days), while osteoblastic cells showed poor adhesion but maintained cell viability and osteogenic potential (3-7 days). (AU)

• FAPESP's process: 16/50298-4 - Natural molecules on the surface of bioactive materials for modulating the host response to implants (NAT4MORE)
• Grantee: Paulo Tambasco de Oliveira
• Support Opportunities: Regular Research Grants