Randi Seljåsen
Research Station Manager
(+47) 406 22 915
randi.seljaasen@nibio.no
Place
Landvik
Visiting address
Reddalsveien 215, 4886 Grimstad
Authors
Mette Thomsen Randi Seljåsen Reidun Pommeresche Till Seehusen Belachew Asalf Tadesse Tatiana Francischinelli Rittl Anne-Kristin LøesAbstract
No abstract has been registered
Abstract
No abstract has been registered
Authors
Randi Seljåsen Barbara Kusznierewicz Agnieszka Bartoszek Jørgen A.B. Mølmann Ingunn M. VågenAbstract
Biosynthesis of phytochemicals in leaves of Brassica can be initiated by abiotic factors. The aim of the study was to investigate elicitor treatments to add value to waste of cabbage. A leaf waste fraction from industrial trimming of head cabbage was exposed to UV radiation (250–400 nm, 59 and 99 kJ∙m−2, respectively), photosynthetic active radiation (PAR, 400–700 nm, 497 kJ∙m−2), and ultrasound in water bath (35 kHz, at 15, 30 and 61 kJ∙l−1 water), in order to improve nutraceutical concentration. UV was more effective than PAR to increase the level of flavonols (2 to 3-fold higher) and hydroxycinnamate monosaccharides (1 to 10-fold higher). PAR was three times as effective as UV to increase anthocyanins. Interaction of PAR + UV increased antioxidant activity (30%), the content of five phenolics (1.4 to 10-fold higher), and hydroxycinnamic monosaccharides (compared with PAR or UV alone). Indoles were reduced (40–52%) by UV, but the other glucosinolates (GLS) were unaffected. Ultrasound did not influence any parameters. The results are important for white cabbage by-products by demonstrating that UV + PAR can be successfully used as an effectual tool to increase important phenolics and antioxidant activity of waste fraction leaves without an adverse effect on the main GLS.