Abstract
The authors have previously demonstrated the fact that a large amount of (+)-S-methyl-L-cysteine sulfoxide is distributed in the whole Allium and Colza plants. In the present experiment the authors succeeded in isolating this compound from raddish, cabbage, cauliflower, turnip and Chinese cabbage among the Cruciferae and from scallion in the Allium. This substance had a melting point of 173-174℃, could be converted into NH_3,pyruvic acid and methyl allicin by alliinase and is converted to thiamine methyldisulfide by the addition of thiamine. This extract was regarded as the same compound as that reported by Synge et al. The authors designated it as "methiin".
