Synthesis of Calcium Phosphate Bioceramics Based on Snail Shells: Towards a Valorization of Snail Shells from Republic of Benin

摘要

In this study, we used Lanistes varicus and Achatina achatina snail shell powders as a calcium source for the synthesis of calcium phosphate bioceramics by using coprecipation method and microwave irradiation method. X-Rays Diffraction Analysis, Thermal Analysis (TGA), Acid-Base back titration method and FTIR analysis of the powders of the snail shells revealed that they contain more than 98% of calcium carbonate CaCO_3 with aragonite as the major phase. Structural characterization and elucidation of synthesized bioceramics were done using X-Rays diffraction analysis, Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR) analysis. The results have revealed that synthesized calcium phosphate bioceramics contain a mixture of Hydroxyapatite (HA: Ca_(10)(PO_4)_6(OH)_2) and apatitic Tricalcium Phosphate (TPa: Ca_9(HPO_4) (PO_4)_5(OH) whatever the method of synthesis. and the variety of snail shell used. The study of the antibacterial activity of synthesized bioceramics has shown that only those obtained with Lanistes varicus powder significantly inhibit the growth of Staphylococcus aureus with a lasting effect. On the other side, inhibition of growth of Klebsiella oxytoca is partial and a resistance to the antimicrobial activity of bioceramics was noticed. Thus bioceramics synthesized from Lanistes varicus snail shell powder has antibacterial property and should be used against the growth of pathogens causing dental cavities.