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Abstract

Narrow-banded UVB affects the stability of secondary plant metabolites in kale (Brassica oleracea var. sabellica) and pea (Pisum sativum) leaves being added to lentil flour fortified bread: A novel approach for producing functional foods.

Young kale and pea leaves are rich in secondary plant metabolites (SPMs) whose profile can be affected by ultraviolet B (UVB) radiation. Carotenoids and flavonoids in kale and pea exposed to narrow-banded UVB, produced by innovative light-emitting diodes (LEDs), and subsequently used for breadmaking were investigated for the first time, thus combining two important strategies to increase the SPMs intake. Breads were also fortified with protein-rich lentil flour. Antioxidant activity in the ‘vegetable breads’ indicated health-promoting effects. Lentil flour increased the antioxidant activity in all of the ‘vegetable breads’. While carotenoids and chlorophylls showed a minor response to UVB treatment, kaempferol glycosides decreased in favor of increasing quercetin glycosides, especially in kale. Additionally, breadmaking caused major decreases in carotenoids and a conversion of chlorophyll to bioactive degradation products. In ‘kale breads’ and ‘pea breads’, 20% and 84% of flavonoid glycosides were recovered. Thus, kale and pea leaves seem to be suitable natural ingredients for producing innovative Functional Foods.



Klopsch, R.; Baldermann, S.; Voss, A., Rohn, S.; Schreiner, M.; Neugart, S. 2019. Narrow-banded UVB affects the stability of secondary plant metabolites in kale (Brassica oleracea var. sabellica) and pea (Pisum sativum) leaves being added to lentil flour fortified bread: A novel approach for producing functional foods. Foods 8, 427

DOI: 10.3390/foods8100427