An undoped and two silver-doped (0, 3 and 5 mol% Ag) phosphate glass compositions were investigated for their structure and properties. These compositions had in a previous study been investigated for their antimicrobial properties, and were found to be extremely potent at inhibiting the micro-organisms tested. Thermal, X-ray diffraction (XRD), nuclear magnetic resonance (NMR) and X-ray absorption Near Edge Structure (XANES) studies were used to elucidate the structure of the compositions investigated, whilst degradation and ion release studies were conducted to investigate their properties. No significant differences were found between the Tg values of the silver containing glasses, while XRD analysis revealed the presence of a NaCa(PO3)3 phase. NMR showed the dominance of Q2 species, and XANES studies revealed the oxidation state of silver to be in the +1 form. No correlation was seen between the degradation and cation release profiles observed, and the P3O93− anion was the highest released anionic species, which correlated well with the XRD and NMR studies. Overall, it was ascertained that using Ag2SO4 as a precursor, and producing compositions containing 3 and 5 mol% Ag, the levels of silver ions released were within the acceptable cyto/biocompatible range.
Ag2O Nuclear Magnetic Resonance Study Ag3PO4 Ag2SO4 Silver Sulphate
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EPSRC is thanked for funding the UCL-Kent-Warwick collaboration on phosphate biomaterials through grants GR/T21080, EP/C000714 and EP/C000633. M.E. Smith also thanks EPSRC and the University of Warwick for partial funding of the NMR infrastructure.
Clement J, Manero JM, Planell JA, Avila G, Martinez S (1999) J Mater Sci: Mater Med 10:729CrossRefGoogle Scholar