Effect of UV-C radiation on bioactive compounds of pineapple (Ananas comosus L. Merr.) by-products

BACKGROUNDThe industrial processing of pineapple generates a high quantity of by-products. To reduce the environmental impact of these by-products and the inherent cost of their treatment, it is important to characterise and valorise these products, converting them into high added value products. Ultra-violet radiation is one of the main sustainable sanitation techniques for fruits. Since this radiation can induce plant stress which can promote the biosynthesis of bioactive compounds, it is important to evaluate its effect in fruits. RESULTSThe amounts of vitamins (C and E) and carotenoids (-carotene, -carotene, -cryptoxanthin, lutein, lycopene, neoxanthin, violaxanthin and zeaxanthin) in pineapple by-products (core and rind) were analysed before and after treatment with UV radiation. All treated and untreated pineapple by-products contained -carotene as the main carotenoid (rind, 2537-3225 mu g; and core, 960-994 mu g 100 g(-1) DW). Pineapple rind also contained lutein (288-297 mu g 100 g(-1) DW) and -carotene (89-126 mu g 100 g(-1) DW). CONCLUSIONThe results provide evidence of the potential of pineapple by-products as a source of bioactive compounds with antioxidant activity, which can be used by pharmaceutical, cosmetics and food industries. In addition, UV-C was shown to be a treatment that can add nutritional value to pineapple by-products. (c) 2014 Society of Chemical Industry