earticle

영어

The seashell that is composed of calcium carbonate crystals and proteins is a typical example of such the biominerals. Biomineralization of CaCO3 and protehins play an important role for the formation of the shell. Crystal structures of CaCO3 become three polymorphic modificatins,
namely calcite, aragonite and vaterite. Polymorphic modifications are mediated by adding additives such as aspartic(Asp) acid and lysozyme. Lysozyme, which is a major component of egg white proteins, has influenced the calcification of avian eggshells. In this work, the influence of Asp and lysozyme on the precipitation was performed from calcium chloride solution into sodium carbonate solution using a mixing vessel. CaCO3 crystals were analyzed by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM) and Fourier
Transform Infrared Spectrometry (FT-IR). XRD was used to select the intensities and crystal structure of specific calcium carbonate. SEM was employed for the analysis of the morphology of the precipitation and particle size. Two kinds of crystals were identified by FT-IR spectrum.
Hexagonal crystals of vaterite were affected by the Asp in the crystallization solution. However, rhombohedral crystals of calcite were formed without any sign of vaterite.