Abstract
Hydroxyapatite (HAp, Ca10(PO4)6(OH)2) is the most stable form of calcium phosphate and widely used in various medical applications, mainly in orthopedics and dentistry due to its close similarities with the inorganic mineral component of bone and teeth. This study aims to synthesize hydroxyapatite from duck eggshell using the precipitation method. The duck eggshell was calcined, hydrated (slaking) and underwent carbonation to form Precipitated Calcium Carbonate (PCC). Afterwards, (NH4)2HPO4 was added to produce HAp by varying the molar ratio of Ca/P by 1.67, 1.77 and 1.87 and stirring speed by 200, 250, 300rpm under basic condition (pH 10 – 11). The best results were obtained at a molar ratio of 1.77 with 200rpm stirring speed. Furthermore, the X-ray Diffraction (XRD) analysis showed that its crystals were hexagonal with sizes of 23.062nm, in the absence of other crystalline phases. Therefore, the hydroxyapatite was obtained in the agglomerates form with a specific surface area of ??55.929m2/g.
Highlights
Hydroxyapatite, Ca10(PO4)6(OH)2, is the main inorganic compound present in hard tissues such as human bone
It was synthesized from duck egg shells using precipitation method. e selection of duck egg shells as a source of calcium was due to its abundance in Indonesia
Precipitated Calcium Carbonate (PCC) is the main material used in synthesizing hydroxyapatite via precipitation method. e reaction for the formation of PCC using modi ed carbonation method is represented by the following equations [13]
Summary
Hydroxyapatite, Ca10(PO4)6(OH), is the main inorganic compound present in hard tissues such as human bone It is readily considered as a bioactive material for arti cial bone and teeth substitution because of its biocompatibility, osteoconductivity, chemical and biological affinity with human bone tissues and teeth. Hydroxyapatite is derived from natural resources rich in calcium carbonate (CaCO3) like limestone [1], cockle shells [2], egg shells [3,4], animal bone [5] or coral [6,7]. In this study, it was synthesized from duck egg shells using precipitation method. Buasri et al (2013) reported that the content of calcium in the form of calcium oxide (CaO) in duck egg shells was 98,925%
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