Antibacterial characteristics of carboncoated CaCO3/Mg0 powder led by the pyrolysis of poly (vinyl alcohol)-dolomite mixture

Abstract

In order to reduce oral diseases with bacterial growth, carbon-coated CaCO3/MgO powder possessing antibacterial activity was obtained by the pyrolysis of poly (vinyl alcohol)-dolomite mixture at 700°C r in an argon gas. Evaluation of the antibacterial activity was performed by colony count method, using Escherichia coli and Staphylococcus aureus. CaCO3 and MgO were formed at the temperature range from 400 to 700°C. At 800°C, CaO was produced by the calcination of CaCO3. The powders after PVA pyrolysis turned into black, i.e., the formation of carbon on its surface. In the case without PVA, the formation temperature of CaCO3/MgO exceeded 100°C than the mixture of dolomite and PVA. Antibacterial activity of the carbon-coated CaCO3/MgO powder against Staphylococcus aureus was found to be stronger than against Escherichia coli. Comparing with CaCO3/MgO powder without carbon, it was found that the antibacterial action was reduced by forming carbon on its surface.