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Crystallization of calcium carbonate were performed by adding aspartic acid and lysine into solution for understanding biomineralization in gas-liquid reaction of and . Proportion between calcite and vaterite of calcium carbonate crystals was identified by changing conditions such as reaction time, addition amount of aspartic acid, lysine, , and . FT-IR(Fourier Transform Infrared spectroscopy) instrument was used to perform analysis of vaterite ratio. Under the condition of 10 g and no additive, an increase of vaterite crystal changed to a decrease around 0.15 M . Then it largely increased at 0.25 M , after vaterite proportion was rising again at 0.20 M . In contrast to that, vaterite crystal continuously decreased to 0.2 M , and increased from 0.25 M with 20 g . Vaterite crystals were observed to be a maximum after 2days with lysine addition, but vaterite crystals showed minimum with aspartic acid.

Effect of Aspartic Acid and Lysine on Polymorphism of Calcium Carbonate Crystal Formed by Gas-Liquid Reaction