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On-line HPLC/electrospray ionization-tandem mass spectrometry (LC/ESI-MS/MS) in conjunction with NMR has been successfully employed to identify and structurally characterize seven contaminants found(More)
Three different commercially available melatonin preparations were analyzed by on-line HPLC-electrospray ionization-tandem mass spectrometry. All three samples contained the same impurities at the(More)
In 1981 a massive food-borne epidemic, termed the toxic oil syndrome (TOS), occurred in Spain. Eight years later a closely related disease, the eosinophilia myalgia syndrome (EMS), was reported in(More)