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Fourier transformed infrared spectroscopy (FTIR) spectra of (A) 0Sr-MBG, (B) 2.5Sr-MBG and (C) 5Sr-MBG disks soaked in simulated body fluid (SBF) between 0 and 72 h. The red circles highlight the bands of crystalline phosphate and the blue circles highlight the bands of carbonate groups, both indicative of the nanometric carbonate hydroxyapatite formation. (A–C).
