{'fraction_non_alphanumeric': 0.04606060606060606, 'fraction_numerical': 0.020606060606060607, 'mean_word_length': 4.816901408450704, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[The determination of urinary oxalate by gas-chromatography].

A new method has been developed for the measurement of urinary oxalate by gas-chromatography. 2ml of urine is derivatized by 10% HCl-n-butanol solution after lyophilization. The di-n-buthyl ester of oxalic acid formed is extracted with chloroform and is detected by flame ionization gas chromatography. The separation of chromatogram was remarkably increased comparing with that using 10% HClmethanol solution. Furthermore, it was confirmed by GC/MS that another compounds did not overlap the peak of di-n-buthyl ester of oxalic acid on chromatogram. The recovery rate of added oxalate in urine was 97% and the variation coefficient of urinary oxalate (n=8) was 2.3%. The oxalate concentration in urine in healthy volunteers was 34.7+9.3mg/day (mean+ SD) (n=35).