Oleuropein/ligstroside isomers and their derivatives in Portuguese olive mill wastewaters
Keywords: OMW; olive mill wastewaters; MS; mass spectrometry; ESI; electrospray ionization; HPLC; high-performance liquid chromatography; ESI-MSn; electrospray ionization-tandem mass spectrometry; CID; collision-induced dissociation; PME; purified methanol extract;