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Table 2 Properties of the major CaPs obtained from aqueous solutions [21]

From: Biomineralization of bone tissue: calcium phosphate-based inorganics in collagen fibrillar organic matrices

Name

Chemical formula

Ca/P ratio

Solubility at 25ºC, -log(Ks)

Solubility at 25ºC (g L−1)

pH stability range at 25ºC

MCPM

Ca(H2PO4)2·H2O

0.5

1.14

 ~ 18

0.0–2.0

DCPD

CaHPO4·2H2O

1.0

6.59

 ~ 0.088

2.0–6.0

OCP

Ca8(HPO4)2(PO4)4·5H2O

1.33

96.6

 ~ 0.0081

5.5–7.0

ACP

CaxHy(PO4)z·nH2O, n = 3–4.5; 15–20% H2O

1.2–2.2

a

a

 ~ 5–12

CDHA

Ca10-x(HPO4)x(PO4)6-x(OH)2 (0 < x < 1)

1.5–1.67

 ~ 85

 ~ 0.0094

6.5–9.5

HAp

Ca10(PO4)6(OH)2

1.67

116.8

 ~ 0.0003

9.5–12

FAp

Ca10(PO4)F2

1.67

120.0

 ~ 0.0002

7–12

  1. MCPM monocalcium phosphate monohydrate, DCPD (brushite) dicalcium phosphate dehydrate, OCP octacalcium phosphate, FAp fluorapatite
  2. aMetastable, no exact value due to various variables