Effect of Amino Acids on the Crystallization Kinetics of Calcium Oxalate Monohydrate
O. A. GOLOVANOVA1, V. V. KOROLKOV1, YU. O. PUNIN2 and A. S. VYSOTSKIY1
1Omsk State University, Prospekt Mira, 55A, Omsk 644077 (Russia)
2Saint Petersburg State University, Universitetskaya Naberezhnaya 7/9, Saint Petersburg 199034 (Russia)
Keywords: calcium monohydrate oxalate, growth, adsorption, amino acids, inhibition, crystallization
Pages: 381–388
Abstract
An integrated set of problems connected with the features of calcium oxalate crystallization in the presence of amino acids is considered. It is established with the help of X-ray phase analysis that the formed precipitates are represented by calcium oxalate monohydrate (wavellite). The kinetic parameters of crystallization were determined. It was shown that the growth of crystals follows the mechanism of two-dimensional nucleation. It was established that amino acids have different effects on crystallization: glutamic acid, arginine, glycine, and lysine inhibit the process, while proline, serine, asparagine serve as the catalysts of the process; some amino acids (alanine, phenylalanine etc.) have insignificant effect on the kinetics of crystal growth. With an increase in supersaturation, the promoting action of amino acid weakens, while the inhibiting action enhances, which is connected with the competition of these effects.
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