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An HPLC procedure has been developed for tocopherol determination with coulometric detection in human serum samples. Eluent optimization and foreign peak identification (bilirubin) by mass spectrometry are described. An extraction procedure gave yields around 98% with 1.3% coefficient of variation, and the calibration ranged from 0.1 to 200 mg/l with a correlation coefficient of 0.999. The detection limit achieved for vitamin E was 60 pg (3 ng/ml).
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