A study of the glucosinolate content of seven common cruciferous vegetables showed wide variation between crops and, in some cases, between cultivars. High progoitrin levels were found in rutabaga (Brassica napobrassica Mill.). Glucosinolates that hydrolyze to give ionic thiocyanate were present in all samples analyzed. Rapine broccoli (B. oleracea var. italica Plenck) had the highest content of thiourea derivative.
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Mullin et al. (1977) studied this question.