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• W4302293934 abstract "Cystinuria is a rare disorder resulting in development of recurrent kidney stones, adversely affecting patient quality of life. The goal of cystinuria management is to reduce stone formation by increasing cystine solubility in urine, which includes lowering the urinary cystine level below its solubility limit. Treatment usually involves alkalinization of the urine and often requires initiating pharmacotherapy with a cystine-binding thiol drug (CBTD) such as tiopronin; however, proper dose adjustment requires accurate measurement of urinary cystine. The goal of this study was to validate a novel high-performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS) method for quantification of cystine in the urine of patients with cystinuria receiving a CBTD. Urine samples were collected over 24 h from 24 patients and separated into 2 aliquots. Chromatographic separation of samples was conducted and separation of cystine from the cysteine-tiopronin drug complex was complete in < 3 min. The method was validated for accuracy, precision, linearity, limit of detection (LOD), and limit of quantification (LOQ). Mean accuracy range was 97.7-102.3%; intermediate precision was high with relative percent difference values calculated at 1.2-9.3%; the calibration curve resulted in a linear response throughout the concentration range (R2 = 0.998); and the LOD and LOQ were 0.002 and 0.005 mg/mL, respectively. Mean (range) cystine concentrations measured were 111.10 (51.31-179.46) and 242.21 (61.14-741.80) g/L in Aliquots A and B, respectively. The HPLC-MS/MS method presented here indicates that urine cystine can be reliably quantified in patients receiving a CBTD." @default.
• W4302293934 created "2022-10-06" @default.
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• W4302293934 date "2022-10-06" @default.
• W4302293934 modified "2023-10-18" @default.
• W4302293934 title "Accurate 24-h urine cystine quantification for patients on cystine-binding thiol drugs" @default.
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• W4302293934 doi "https://doi.org/10.1007/s00240-022-01364-9" @default.
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