. Author manuscript; available in PMC: 2008 May 22.

Published in final edited form as: J Mater Sci Mater Med. 2007 Jul 10;19(2):507–515. doi: 10.1007/s10856-007-3178-3

Table 2.

The ion activity product (IAP; mean ± SD) and the thermodynamic stability* (ΔG^o, mean ± SD) of the solutions containing the maximum levels of Ca and PO₄ released from ACP/UDMA, UDMA/PEG-U and PEG-U composites (calculated from the experimental kinetic data presented in Fig. 8). Negative ΔG^o value indicates solution supersaturated with respect to stoichiometric hydroxyapatite. Standard deviation of values is indicated in parentheses.

Matrix	IAP	ΔG^o (kJ/mol)
UDMA	108.15 (1.09)	-2.96 (0.43)
UDMA/PEG-U	103.11 (1.19)	-4.49 (0.36)
PEG-U	104.45 (1.43)	-4.08 (0.43)