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. Epiprogoitrin; glucoraphanin; glucoerucin; and 4-methoxyglucobrassicin were present in a few varieties and no statistical differences in concentrations among varieties were found (Padilla et al. 2007)