Comparative Investigation of Crystallization of Calcium Oxalate in Different Mimetic Systems

Abstract

Abstract: The nucleation, growth and aggregation of calcium oxalate(CaC₂O₄) crystals were comparatively investigated in five different mimetic systems: water, NaCl solution, artificial urine, healthy urine and lithogenic urine by using scanning electron microscopy(SEM). The effects of original concentration of calcium ion and oxalate ion and crystallization time on the morphology, density and the size of CaC₂O₄ crystals were discussed. In lithogenic urine, calcium oxalate monohydrate(COM) crystals were the dominant phase. However, a mixture of COM and calcium oxalate dihydrate(COD) with a molar ratio of about 3∶2 was obtained in the healthy urine. COD has a less affinity for renal tubule cell surface, so COD is easy to be expelled out from body and there is a less probability of stone-forming in the healthy urine. The fastest nucleation and growth of CaC₂O₄ crystals were obtained in water and NaCl solution, respectively. The size of CaC₂O₄ crystals decreases in the following order: NaCl solution>artificial urine>lithogenic urine>healthy urine>water.

Key words: Calcium oxalate, Urinary stones, SEM, Biomineralization

CLC Number:

O614.23

TrendMD:

OUYANG Jian-Ming, YAO Xiu-Qiong, ZHONG Jiu-Ping, XIE Yu-Shan, BAI Yu, KUANG Li, TANG Wen-Xia . Comparative Investigation of Crystallization of Calcium Oxalate in Different Mimetic Systems[J]. Chem. J. Chinese Universities, 2002, 23(12): 2237.

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Comparative Investigation of Crystallization of Calcium Oxalate in Different Mimetic Systems

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