Physical property and water absorption capacity of paper coated with hydroxyapatite composite film

Paper packaging for food products is lightweight and low price but not moisture-proof. This makes it unusable for certain foods. Therefore, this research created the concept of synthesis of hydroxyapatite (HAp) from bovine bone, studying the optimum of HAp for composite material consisting of sodium alginate (SA) and cassava starch (CA) for physical and water absorption capacity properties. The HAp was synthesized from waste bovine bones by calcination at 900 °C. The synthesized HAp powders were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The results showed HAp with the surface functional group of hydroxyl and phosphate groups. The molar ratio of calcium to phosphorus was 1.53. After that, it was prepared as a composite film coating on brown paper with SA and CA at the concentration of 2 % wt using HAp at 0, 1, 3, and 5 % wt. The result found that coated paper with the HAp 1 % wt composite with CA showed water absorption capacity (p<0.05), 15.17 ± 0.30 %, the paper had a thickness of 0.21 ± 0.01 mm, moisture content 17.51 ± 1.30 %, tensile strength 31.50 ± 2.30 MPa, and elongation of paper 9.23 ± 1.63 %.