Changes in the content of minerals, B-group vitamins and tocopherols in processed kale leaves

Anna Korus


The human body cannot produce minerals, B-group vitamins or tocopherols, so these must be supplied in food. Kale and other Brassica vegetables are good sources of these substances, but food processing can affect their content. Therefore, the aim of this study was to determine the effect of the type of pre-treatment (blanching or cooking), the method of preservation (freezing or canning) and 12-month storage on the content of minerals, vitamins B1 and B2, and tocopherols in kale leaves (Brassica oleracea L. var acephala). Pre-processing of kale leaves prior to preservation led to a significant reduction in minerals and vitamins of 26–52 % (blanching) and 29–75 % (cooking). The most abundant macroelements in the products were potassium and calcium, whereas the microelements with the highest values were iron and copper. The highest content of minerals, B group vitamins and tocopherols was observed in frozen products from blanched raw kale leaves. After 12 months storage, the frozen products retained 24–74 % macroelements, 40–71 % microelements, 45–71 % vitamin B1, 27–47 % vitamin B2 and 69–85 % total tocopherols, while the canned products (leaves without brine) retained 41–70 %, 31–56 %, 21–23 %, 6–9 % and 44–48 %, respectively.
Author Anna Korus (FoFT / Department of Plant Product Technology and Nutrition Hygiene)
Anna Korus,,
- Department of Plant Product Technology and Nutrition Hygiene
Journal seriesJournal of Food Composition and Analysis, ISSN 0889-1575, e-ISSN 1096-0481, (N/A 100 pkt)
Issue year2020
Publication size in sheets0.5
Keywords in EnglishKale, Preliminary treatment, Food processing, Freezing, Minerals, Vitamins, Food analysis, Food composition
ASJC Classification1106 Food Science
Languageen angielski
Score (nominal)100
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 1.46; WoS Impact Factor: 2018 = 2.994 (2) - 2018=3.44 (5)
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FinansowanieThis research wasfinanced by the Ministry of Science and HigherEducation of the Republic of Poland
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