Seasonal variation in glucosinolate content in Brassica oleracea crops grown in northwestern Spain

Aliphatic, indolyl and aromatic glucosinolates were identified from leaves of kale, cabbage, and Tronchuda cabbage varieties (Brassica oleracea sp.) grown in northwestern Spain. Sinigrin makes the major contribution of glucosinolates to kales, while glucobrassicin or glucoiberin do so to cabbage leaves. The influence of sowing date on glucosinolate content and the nutritional effects of these compounds glucosinolates are discussed.