On Biomimetics by Lilyana Pramatarova

Biomimetic Modifications of Calcium Orthophosphates
145

ZnCO 3 .H 2 O -5.10

Zn 2 (OH) 3 Cl -12.28

ZnSO 4 .H 2 O -13.98

ZnSO 4 .6H 2 O -12.88

ZnSO 4 .7H 2 O -12.64

Zn 2 (OH) 2 SO 4 -16.36

Zn 3 (PO 4 ) 2 .4H 2 O -9.49

Table 7. Saturation indices (SI) of solid phases in the studied systems.

conventional, SBFc, revised, SBFr, and conventional modified with glycine, SBFg (Table 3).
Before maturation the precipitated precursors were filtered, washed with water and with
acetone (solid-to-liquid ratio of 1:1) and lyophilized at -56oC. Then the freeze-dried samples
were matured for varying time periods (from 1 h to 6 months) at a solid-to-liquid ratio of
1:250, physiological temperature of 37oC, in a static regime.
The biomimetic modification of SBF-modified ACP in SBFc, SBFr and SBFg gave rise to
changes in the compositions of both solid and liquid phases during the maturation process
(Fig. 3) and revealed that dissolution/crystallization processes are strongly influenced by
the content of SBFs.

0 1020304050607080

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

PO

3- 4

, mmol/l

time, h

a.

0 1020304050607080

0.5

1.0

1.5

2.0

2.5

3.0

3.5

Ca

2+, mmol/l

time,h

b.

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