Comparison of Glucosinolate Profiles in Different Tissues of Nine Brassica Crops

Glucosinolate (GSL) profiles and concentrations in various tissues (seeds, sprouts, mature root, and shoot) were determined and compared across nine Brassica species, including cauliflower, cabbage, broccoli, radish, baemuchae, pakchoi, Chinese cabbage, leaf mustard, and kale. The compositions and concentrations of individual GSLs varied among crops, tissues, and growth stages. Seeds had highest total GSL concentrations in most of crops, whereas shoots had the lowest GSL concentrations. Aliphatic GSL concentrations were the highest in seeds, followed by that in sprouts, shoots, and roots. Indole GSL concentration was the highest in the root or shoot tissues in most of the crops. In contrast, aromatic GSL concentrations were highest in roots. Of the nine crops examined, broccoli exhibited the highest total GSL concentration in seeds (110.76 µmol·g(−1)) and sprouts (162.19 µmol·g(−1)), whereas leaf mustard exhibited the highest total GSL concentration in shoots (61.76 µmol·g(−1)) and roots (73.61 µmol·g(−1)). The lowest GSL concentrations were observed in radish across all tissues examined.