ABSTRACT
ABSTRACT: The eect of three kinds of carboxylates on formation of dierent crystal phases of calcium oxalate (CaOx) was comparatively studied in physiological saline and in artificial urine. These carboxylates were sodium glycinate (NaGlu, monocarboxylate), sodium tartrate (Na2Tart, dicarboxylate), sodium citrate (Na3Cit, tricarboxylate), respectively. In artificial urine, the percentage of the formed Calcium Oxalate Dehydrate (COD) increased with the increase of the number of carboxyl groups (–COOH) of carboxylate, and calcium phosphate and CaHPO4·2H2O were also formed. However, only Na2Tart could induce the formation of Calcium Oxalate Trihydrate (COT) and COD in saline. The causes of formation of dierent crystal phases were discussed from the structures of carboxylates and the components of the system.
