Reproducibility of Retention Times of Cortisol and Internal Standard ( n = 10 ) Retention time

@inproceedings{Levine2004ReproducibilityOR,
  title={Reproducibility of Retention Times of Cortisol and Internal Standard ( n = 10 ) Retention time},
  author={Allen Stuart Levine},
  year={2004}
}
When the free cortisol in urine was analyzed by liquid chomatography after pretreatment with the usual organic extraction, interfering substances having chromatographic behavior similar to that of cortisol and the internal standard precluded accurate measurement. To remove these materials, we processed the organic extract by liquid chromatography with a… CONTINUE READING