Table 1 31P and 19F chemical shift (ppm) before and at 7 days of immersion in Tris buffer solution (see MAS NMR spectra in Fig. 3).

From: Nano-imaging confirms improved apatite precipitation for high phosphate/silicate ratio bioactive glasses

Glass

δ(31P) before immersion

δ(31P) at 7 days of immersion

δ(19F) before immersion

δ(19F) at 7 (14) days of immersion

P0

n/a

n/a

− 93.8

− 94.8 (− 94.8)

− 108.4 (− 108.8)

P2

2.50

2.24

− 96.5

− 101.0

− 108.6

P3

2.63

2.23

− 93.2

− 102.0

− 108.6

P5

2.80

2.21

− 96.4

− 102.0

− 108.1

  1. Values at 14 days of immersion are also shown for P0 glass. For phosphate containing glasses, no analysis was carried out at 14 days as fluorapatite was already detected at 7 days of immersion.
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