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


RESULTS
The amounts of vitamins (C and E) and carotenoids (α-carotene, β-carotene, β-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 β-carotene as the main carotenoid (rind, 2537-3225 µg; and core, 960-994 µg 100 g(-1) DW). Pineapple rind also contained lutein (288-297 µg 100 g(-1) DW) and α-carotene (89-126 µg 100 g(-1) DW).


CONCLUSIONS
The 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.
Department of Food and Nutrition, National Institute of Health Dr. Ricardo Jorge, Av. Padre Cruz, 1649-016, Lisbon, Portugal; CEER - Biosystems Engineering, ISA, University of Lisbon, Tapada da Ajuda, 1349-017, Lisboa, Portugal.
Ana
A
Freitas
Margarida
M
Moldão-Martins
Helena S
HS
Costa
Tânia G
TG
Albuquerque
Ana
A
Valente
Ana
A
Sanches-Silva
D031230:Ananas / Q000737:chemistry*; D000975:Antioxidants / Q000032:analysis; D001205:Ascorbic Acid / Q000032:analysis; D002338:Carotenoids / Q000032:analysis; D005511:Food Handling / Q000379:methods*; D005514:Food Irradiation; D005638:Fruit / Q000737:chemistry* / Q000528:radiation effects*; D014975:Lutein / Q000032:analysis; D014466:Ultraviolet Rays; D014801:Vitamin A / Q000032:analysis; D014810:Vitamin E / Q000032:analysis; D019207:beta Carotene / Q000032:analysis
D000975:Antioxidants; D019207:beta Carotene; D014801:Vitamin A; D014810:Vitamin E; D002338:Carotenoids; C041635:alpha-carotene; D001205:Ascorbic Acid; D014975:Lutein
UV-C radiation; bioactive compounds; by-products; pineapple; ultra-high performance liquid chromatography