{'fraction_non_alphanumeric': 0.03217821782178218, 'fraction_numerical': 0.019801980198019802, 'mean_word_length': 5.175572519083969, '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}}
Spectrophotometric assay of antipyrine in plasma: a reevaluation.

The linearity, sensitivity, and replicability of the spectrophotometric antipyrine assay were reevaluated. Standard curves are always linear through concentrations of at least 50 microgram/ml, whether prepared in water, dilute acid, or plasma. Sensitivity limits are 1 to 2 microgram of antipyrine per ml of plasma in healthy individuals. Within-day coefficients of variation for identical samples ranged from 12.3% at 2 microgram/ml to 1.2% at 50 microgram/ml. Identical samples assayed two years apart deviated by a mean of 3.8%, indicating high between-day replicability as well as stability during prolonged storage at -20 degrees C. Thus the spectrophotometric assay for antipyrine is suitable for most clinical pharmacokinetic studies.