Assessing melatonin and its oxidative metabolites amounts in biological fluid and culture medium by liquid chromatography electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) - Coelho, Mirela Batista; Cunha, Maria Carolina Rodrigues Valerino da; Ferreira, Christina Ramires; Cabral, Elaine Cristina; Nogueira, Guilherme de Paula; Eberlin, Marcos Nogueira; Leal, Claudia Lima Verde; Simas, Rosineide Costa (Analytical Methods, 2013)