[1] I. Brondz and A. Brondz, “Supercritical Fluid Chromatography—Mass Spectrometry (SFC-MS) and MADI- TOF-MS of Heterocyclic Compounds with Trivalent and Pentavalent Nitrogen in Cough Relief Medical Forms Tuxi and Cosylan,” American Journal of Analytical Chemistry, Vol. 3, No. 12A, 2012, pp. 870-876. doi:10.4236/ajac.2012.312A115
[2] J. R?e, “Identification of Pholcodine Degradation Products/Determination of Chemical Structures,” The 13th Technical Conference, Wilmington, September 1997.
[3] O. M. Denk, G. G. Skellern and D. G. Watson, “Impurity Profiling of Pholcodine by Liquid Chromatography Electrospray Ionization Mass Spectrometry (LC-ESI-MS),” Journal of Pharmacy and Pharmacology, Vol. 54, 2002, pp. 87-98. doi:10.1211/0022357021771788
[4] J. W. Findlay, “Pholcodine,” Clinical Pharmacology & Therapeutics, Vol. 13, No. 1, 1988, pp. 5-17. doi:10.1111/j.1365-2710.1988.tb00502.x
[5] M. R. Fennessy and H. J. Fearn, “Some Observations on the Toxicology of Morphine-N-Oxide,” Journal of Pharmacy and Pharmacology, Vol. 21, No. 10, 1969, pp. 668- 673. doi:10.1111/j.2042-7158.1969.tb08143.x
[6] E. Florvaag, S. G. O. Johansson, H. ?man, T. Harboe and A. Nopp, “Pholcodine Stimulates a Dramatic Increase of IgE in IgE-Sensitized Individuals. A Pilot Study,” Allergy, Vol. 61, 2006, pp. 49-55. doi:10.1111/j.1398-9995.2005.00933.x
[7] T. Harboe, S. G. O. Johansson, E. Florvaag and H. ?man, “Pholcodine Exposure Raises Serum IgE in Patients with Previous Anaphylaxis to Neuromuscular Blocking Agents,” Allergy, Vol. 62, No. 12, 2007, pp. 1445-1450. doi:10.1111/j.1398-9995.2007.01554.x
[8] B. Proksa, “Separation of Morphine and Its Oxidation Products by Capillary Zone Electrophoresis,” Journal of Pharmaceutical and Biomedical Analysis, Vol. 20, No. 1-2, 1999, pp. 179-183. doi:10.1016/S0731-7085(99)00015-1