title: [Effect of urinary pH value on the composition of urinary nanocrystals].
abstract: The effect of urinary pH value on the composition of urinary nanocrystals was investigated by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. The differentiation of composition of urinary nanocrystals not only occurred between the people with different urinary pH, but also occurred in the same person when his or her urinary pH changed. At lower urinary pH (such as pH<5.8), most of the urinary components are uric acid, acidic phosphate, calcium oxalate etc. However, most of these components are urate, phosphate, magnesium ammonium phosphate, calcium oxalate etc at higher urinary pH (such as pH>6.2). Combining XRD and FTIR methods, t he compositions o f urinary nanocrystals can b edetermined accurately. It is helpful to exploring the cause of urinary stones.
authors.affiliation: Institute of Biomineralization and Lithiasis Research, Jinan University, Guangzhou 510632, China.
authors.forename: Xiao-Jing
authors.initials: XJ
authors.lastname: Xu
authors.forename: Mu-Hua
authors.initials: MH
authors.lastname: Wan
authors.forename: Jian-Ming
authors.initials: JM
authors.lastname: Ouyang
mesh_terms: D002118:Calcium / Q000652:urine; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D014527:Uric Acid / Q000737:chemistry*; D014545:Urinary Calculi / Q000737:chemistry*; D014961:X-Ray Diffraction / Q000379:methods*; D014965:X-Rays
chemical_list: D014527:Uric Acid; D002118:Calcium