Kale: An excellent source of vitamin C, pro-vitamin A, lutein and glucosinolates

Kale (Brassica oleracea Acephala group) is a green leafy vegetable with high content of nutraceuticals. However, the content of bioactive compounds of kale is affected by the cultivar, and thus it is necessary to identify kale cultivars that have the highest nutritional content, to promote their consumption. The present project's objective was to characterize the bioactive compounds (phenolic compounds, vitamin C, glucosinolates and individual carotenoids) and the antioxidant capacity of two kale cultivars (Winterbor and Maribor). The Winterbor cultivar presented higher content of phenolic compounds, carotenoids and higher antioxidant capacity than the Maribor, whereas the Maribor cultivar showed higher levels of vitamin C and glucosinolates. One serving size of kale provides more than 100% of the recommended daily intake (RDI) of vitamin A and more than 40% of the RDI of vitamin C. Therefore, kale can be considered an excellent source of antioxidants.