Biomimetic fabrication of antibacterial calcium phosphates mediated by polydopamine

Lucia Forte, Paola Torricelli, Francesca Bonvicini, Elisa Boanini, Giovanna Angela Gentilomi, Gigliola Lusvardi, Elena Della Bella, Milena Fini, Edoardo Vecchio Nepita, Adriana Bigi

Research output: Contribution to journalArticle

Abstract

In this work we developed new antibacterial composite materials using polydopamine (PDA) to trigger the deposition of silver nanoparticles (AgNPs) onto calcium phosphates, namely octacalcium phosphate (OCP) and α-tricalcium phosphate (αTCP). Functionalization of OCP and αTCP with a self-polymerized polydopamine layer was obtained by soaking the calcium phosphates in dopamine solution. The PDA surface of functionalized calcium phosphates (OCPd and αTCPd) promoted the deposition of AgNPs by reducing silver ions when soaked in a silver nitrate solution. The amount of deposited AgNPs can be modulated by varying the concentration of silver nitrate solution and the type of substrate. The results of in vitro tests carried out with osteoblast-like MG63 cells indicate that the combination of AgNPs with OCP provides more biocompatible materials than those obtained using αTCP as substrate. In particular, the study of osteoblast activity and differentiation was focused on the samples OCPdAg5 (silver content=8.2wt%) and αTCPdAg5 (silver content=4.7wt%), which did not show any cytotoxicity, and compared with those obtained on pure OCP and αTCP. The results demonstrate that the AgNPs loaded materials support osteoblast viability and differentiation, whereas they significantly inhibit the growth of relevant antibiotic-resistant pathogenic bacteria.
Original languageEnglish
Pages (from-to)43-53
Number of pages11
JournalJournal of Inorganic Biochemistry
Volume178
DOIs
Publication statusPublished - Jan 2018

Keywords

  • Multi-drug resistant bacteria
  • Octacalcium phosphate
  • Osteoblast
  • Polydopamine
  • Silver nanoparticles
  • α-Tricalcium phosphate

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    Forte, L., Torricelli, P., Bonvicini, F., Boanini, E., Gentilomi, G. A., Lusvardi, G., Bella, E. D., Fini, M., Vecchio Nepita, E., & Bigi, A. (2018). Biomimetic fabrication of antibacterial calcium phosphates mediated by polydopamine. Journal of Inorganic Biochemistry, 178, 43-53. https://doi.org/10.1016/j.jinorgbio.2017.10.004