Chitin, a polymer of 2-acetamido-2-D-glucose, and calcium phosphate composite was prepared by the process of phosphorylation of chitin substrate, Ca(OH)
2 treatment and immersion in SBF solution. The C-6 chemical shift positions of
13C MAS NMR in the chitin fibres phosphorylated using urea and H
3PO
4 obviously indicate that phosphorylation takes place not in the C-1 but in the C-6 region. Chitin samples were phosphorylated using urea and H
3PO
4 and then soaked in saturated Ca(OH)
2 solution at ambient temperature. This leads to the formation of thin coatings by particalhydrolysis of the PO
4 functionalities, and stimulated growth of calcium phosphate coating on their surfaces after soaking in SBF solution was observed. The procedure can be applied to chitosan samples. This study demonstrates a useful method for creating faborable lacal conditions that lead to nucleation and growth of calcium phosphate over chitin or chitosan substrates.
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