Broad-spectrum bactericidal activity of a new bioactive grafting material (F18) against clinically important bacterial strains

• Published in: International journal of antimicrobial agents 2017-12, Vol.50 (6), p.730-733
• Main Authors: Souza, M.T., Campanini, L.A., Chinaglia, C.R., Peitl, O., Zanotto, E.D., Souza, C.W.O.
• Format: Article
• Language: English
• Subjects: Antibacterial activity; Bactericidal; Bioactive glass; Biocompatible Materials - chemistry; Biocompatible Materials - pharmacology; Disinfectants - pharmacology; Glass fibres; Gram-Negative Bacteria - drug effects; Gram-Positive Bacteria - drug effects; Microbial Viability - drug effects; Silver - pharmacology; Staphylococcus aureus; Time Factors; Tissue engineering
• ISSN: 0924-8579; 1872-7913
• DOI: 10.1016/j.ijantimicag.2017.08.015

•A systematic investigation of F18 in powder and fibre forms was performed according to JIS Z 2801:2010.•F18 presented efficient broad-spectrum bactericidal activity against all tested strains (eliminating nearly 100% of CFU).•Silver-doped F18 showed increased bactericidal effect against S. aureus, with eradication occurring in only 30 min.•F18 may be a promising infection-preventing alternative for wound healing and bone grafting. Infection is the most relevant surgical complication in implant or grafting procedures. Osteomyelitis and other chronic conditions pose a constant challenge in current medical practice. In this context, a grafting biomaterial that possesses antibacterial properties combined with bioactivity could have great clinical impact. Researchers at the Vitreous Materials Laboratory (LaMaV–UFSCar) recently developed a glass composition, named F18, that presents an improved workability range combined with high bioactivity. With F18, one can easily manufacture complex shapes, such as scaffolds, continuous fibres and coat implants. This biomaterial has proven to be a viable alternative for bone and skin regeneration in in vivo tests, however its antimicrobial properties have not been explored. Hence, the purpose of this study was to systematically investigate the antibacterial activity of F18 in powder and fibre forms according to the JIS Z 2801:2010 standard. Whether incorporation of silver into F18 glass could impact its antimicrobial activity was also evaluated. Four clinically relevant Gram-positive and Gram-negative pathogenic bacterial strains (Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli and Pseudomonas aeruginosa) were used in this study. In both powder and fibre forms, F18 presented extremely efficient bactericidal activity against all strains tested, eliminating virtually 100% of the bacterial cells after 24 h. Kinetic tests showed that silver doping further increased the bactericidal activity, leading to S. aureus eradication in only 30 min after incubation. Both doped and non-doped glasses demonstrated very high bactericidal activity, making F18 a promising infection-preventing alternative for bone and wound regeneration in clinical practice.