Octacalcium phosphate, effect

M.J. Mura-Galelli, FI. Narusawa, T. Simada, M. lijima, T. Aoba, Effect of fluoride on precipitation and hydrolysis of octacalcium phosphate in an experimental model simulating enamel mineralization during amelogenesis. Cells Mater. 2 (1992) 221-230. 

M. lizima and Y. Moriwaki, In vitro study of the formation mechanism of tooth enamel apatite crystals - Effects of organic matrices on crystal growth of octacalcium phosphate(OCP),/.Japan. Assoc. Crystal Growth, 26,1999,175-83 (in Japanese with English abstract)... 

It has been shown that the finite pulse RFDR sequence can be used effectively for DQ NMR spectroscopy at a spinning frequency of 10 kHz. The P NMR data measured for hydroxyapatite and octacalcium phosphate showed that sizable DQ excitation efficiency can be obtained with the ratio of the recoupling field to spirming frequency set equal to 1.67. 

Fluoride ions have an important effect on the formation of the inorganic phase in enamel since they act as a catalyst for the conversion of octacalcium phosphate to hydroxyapatite. This has been demonstrated for extremely low levels of fluoride in vitro and it has also been shown that the presence of fluoride during hydroxyapatite formation improves the perfection of the crystals. 

Lee, W.K., J.S. Ko, and H.M. Kim. 2002. Effect of electrostatic interaction on the adsorption of globular proteins on octacalcium phosphate crystal film. Journal of Colloid and Interface Science 246 (1) 70-77. Norde, W. and T. Zoungrana. 1998. Surface-induced changes in the stracture and activity of enzymes physically immobilized at sohd/hquid interfaces. Biotechnology and Applied Biochemistry 28 133-143. 

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