Abstract
Nutritional value and disease-preventive effects of cabbage are well-known. Levels of the antioxidant compounds ascorbic acid (AA) and glucosinolates (GSL) in new Czech cabbage cultivars were determined in the context of different production systems. The contents of AA and GSLs in cabbage biomass were determined by HPLC. Individual GSLs were identified according to their exact masses with sinigrin used as the external standard. Artificial infection with A. brassicicola generally raised the AA levels. The major GSLs (≥10 mg kg−1) were glucobrassicin, sinigrin, and glucoiberin. Indole and aliphatic GSLs were present, but no aromatic ones were detected. Ecological growth conditions and the artificial fungal infection increased the total content of GSLs and, also, of the methoxylated indole GSLs. Sulforaphane, iberin, indole-3-carbinol, and ascorbigen resulting from the hydrolysis of GSLs were found in both cultivars. The amounts and profiles of GSLs present in the two Czech cultivars demonstrated their good nutritional value. The decomposition products sulforaphane, iberin, indole-3-carbinol, and ascorbigen detected improve its health-promoting qualities and represent a suitable component of the human diet.
Highlights
Head cabbage belongs to vegetables with a high nutrient-to-price ratio and contain phytochemicals associated with potential human health benefits
The beneficial effects have been attributed to the antioxidant-activity compounds such as ascorbic acid (AA) and glucosinolates (GSLs) [1,2]
Cabbage is an important source of AA and GSLs in the human diet
Summary
Head cabbage belongs to vegetables with a high nutrient-to-price ratio and contain phytochemicals associated with potential human health benefits. Cabbage is an important source of AA and GSLs in the human diet. Various cabbage cultivars have been shown to contain concentrations of AA ranging from 316 to 676 mg kg−1 [1,3,4]. They are influenced by the year, vegetation period, fertilization and geographical conditions [5,6]. The effect of fertilization on AA content is ambiguous; the use of green manure raised the amount of AA in cabbage whereas no effect was found when an NPK fertilizer [containing as macronutrients nitrogen (N), phosphorus (P) and potassium (K)] or compost were used [7,8,9]
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