Defective LB Films Induced by Potassium Oxalate and Its Effect on Deposited Patterns of Calcium Oxalate

Chem. J. Chinese Universities

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Defective LB Films Induced by Potassium Oxalate and Its Effect on Deposited Patterns of Calcium Oxalate

DENG Sui-Ping, ZHANG Sheng, OUYANG Jian-Ming, CAI Ji-Ye

Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China

Received:2006-07-25 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
Contact: OUYANG Jian-Ming

Abstract

Abstract: The defective Langmuir-Blodgett(LB) film of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine(DPPC) induced by potassium oxalate(K₂C₂O₄) and its effect on nucleation and growth of calcium oxalate monohydrate(COM) were investigated with the aid of atomic force microscopy(AFM) and scanning electron microscopy(SEM). K₂C₂O₄ can destruct the molecules arrangement in the circular domains in LB film especially at the boundaries of liquid condensed(LC) and liquid expanded(LE) phases, which provides much more nucleating sites for COM crystals and promotes the nucleation and growth of COM crystals. It results in the formation of circular COM crystals patterns. As the concentration of potassium oxalate increases from 0.3 mmol/L to 5.0 mmol/L, the patterns of the COM crystals change from a solid circle to a ring-shape, the number of patterns increases and the average diameter of the patterns decreases. The results would shed light on the molecular mechanism of structure change in renal epitheial membrane injured by oxalate at the molecular and supramolecular level, and on the relationship between urolithiasis and the injury of renal epitheial membrane.

Key words: Defect, AFM, Calcium oxalate, DPPC, Langmuir-Blodgett film, Nephrolith

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DENG Sui-Ping, ZHANG Sheng, OUYANG Jian-Ming, CAI Ji-Ye. Defective LB Films Induced by Potassium Oxalate and Its Effect on Deposited Patterns of Calcium Oxalate[J]. Chem. J. Chinese Universities, doi: .

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Defective LB Films Induced by Potassium Oxalate and Its Effect on Deposited Patterns of Calcium Oxalate

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