The lycopene isomers were identified, in both the columns, by comparison of the spectra features and elution order with data from literature (Hengartner et al.; 1992; Mercadante et al., 1999; Nunes and Mercadante, 2004) and with authentic standards of all-trans-, 5-cis-, 9-cis- and 13-cis lycopene from DSM Nutritional Products
(Switzerland).