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  • Title: [Rapid method for the determination of urinary oxalic acid by gas liquid chromatography (author's transl)].
    Author: Decoux G, Boujet C, Rual M, Drouet C, Lafond JL, Favier A, Agnius-Delord C.
    Journal: Clin Chim Acta; 1982 Apr 08; 120(2):207-17. PubMed ID: 7067145.
    Abstract:
    A rapid method for the determination of urinary oxalic acid by gas-liquid chromatography is described. The procedure involves extraction of oxalate from urine by tetrahydrofuran followed by evaporation to dryness and subsequent with diesterification with the boron-trifluoride propanol. The derivative is extracted with hexane and is detected by FID gas chromatography. Malonic acid is used as internal standard. Analytical recovery ranged from 94 to 105%. The coefficient of variation in replicate aliquots over the entire range is less than 6%. The expected range for our method is calculated to be 44 to 577 mumol of oxalate per 24-h urine.
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