High-performance liquid chromatographic determination of phenylephrine in human serum using column switching with fluorescence detection Yamaguchi, M.; Monji, H.; Aoki, I.; Yashiki, T. Journal of Chromatography. B Biomedical Applications 661(1): 93-99 1994 1572-6495 10.1016/0378-4347(94)00330-0 https://eurekamag.com/research/008/774/008774794.php