Martins, Margarida MoldãoFreitas, Ana Cristina Nunes Filipe2011-04-292011-04-292010http://hdl.handle.net/10400.5/3077Mestrado em Engenharia Alimentar - Instituto Superior de AgronomiaThe aim of the current work was to characterize/quantify bioactive compounds of by-products of pineapple industries and to study the effect of UV-C radiation on those compounds. The bioactive compounds studied were eight carotenoids, vitamins A, C and E, eight minerals and pectins. Further characterization of pineapple by-products included moisture content, pH, total soluble solids (TSS), ash, and colour. The study of the effect of UV-C radiation on bioactive compounds focused on carotenoids and vitamins. Pineapple by-products studied had high levels of vitamin C and minerals (mainly K, Na, Mg and Ca). Both pineapple by-products presented b-carotene. In opposition to pineapple core, pineapple rind had detectable amounts of lutein and a- carotene. Pineapple rind presented higher levels of retinol activity equivalents (RAE), carotenoids, pH, ash, Zn, Ca, K and pectins and lower TSS, Mg and L-ascorbic acid than pineapple core. The UV-C treatment led to an increase of b-carotene, a-carotene, RAE and L-ascorbic acid in pineapple rind and to a decrease of pineapple core L-ascorbic acid. UV-C had no effect on lutein content of pineapple rind and on b-carotene and RAE of pineapple core. The results also showed that the type of pineapple by-product had a higher influence on bioactive compounds content than the applied UV-C treatmentengpineapplebioactive compoundsby-productsUV-C radiationmaster thesis