Glucosinolate levels in leaves were determined in a collection of 113 varieties of turnip greens (Brassica rapa L.) from northwestern Spain grown at two sites. Sixteen glucosinolates; belonging to the three chemical classes; were detected in the whole collection. Three glucosinolates were detected in all varieties: glucobrassicanapin; glucobrassicin; and gluconasturtiin and four more were detected in about 90% of the varieties: gluconapin; progoitrin; glucoiberin; and neoglucobrassicin (Padilla et al. 2007)