The effect of Leucine on the crystal growth of calcium phosphate |
| |
Authors: | E Dalas P Malkaj Z Vasileiou D G Kanellopoulou |
| |
Affiliation: | (1) Department of Chemistry, University of Patras, Patras, 26504, Greece;(2) Department of Chemical Engineering, University of Patras, Patras, 26504, Greece |
| |
Abstract: | Crystallization kinetics of hydroxyapatite, HAP, in the presence of Leucine, a natural aminoacid with hydrophobic side groups,
were investigated at conditions of sustained supersaturation, 37 °C, pH 7.40, ionic strength 0.15 M. In the presence of Leucine,
the crystal growth rates of HAP decreased markedly. Τhis action is due to adsorption and subsequent blocking of the active
growth sites onto the surface of the HAP crystals. The kinetic results revealed that a Langmuir-type adsorption isotherm is
followed and an affinity constants of k
aff
= 20.26 × 102 L/mol for HAP crystal surface were calculated. The apparent order of the crystal growth reaction was found to be equal to
two, suggesting a surface diffusion controlled mechanism. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|