Contents of Pungent Principle in Roots of Japanese Radish (Raphanus sativus L.) Cultivars

OKANO Kunio, ASANO Jiro, ISHII Gensho

doi:10.2503/jjshs.59.551

The contents of 4-methylthio-3-butenyl isothiocyanate (MTB-ITC) in roots of Japanese radish (Raphanus sativus L. ) were determined by gas chromatography to evaluate the relative pungency of cultivars. The relationship between the content of MTB-ITC and the taste of grated radish was also examined. The contents of MTB-ITC in more than half of the commercial cultivars ranged from 200 to 300μmol/100ml juice. Among the cultivars examined, ‘Karami’ showed the highest content of MTB-ITC, reaching as much as 1735μmol/100ml, followed by ‘Shinshu-jidaikon’ group of 400-700μmol/100ml. ‘Ninengo’ and ‘Shiroagari’ groups also exhibited relatively high content averaging more than 300μmol/100ml. On the contrary, ‘Miyashige’ group or Chinese cultivars contained the lowest level of MTB-ITC ranging from 100 to 200μmol/100ml. Coefficients of variance in MTB-ITC content among individual roots were 32-43% in oldtype purebred cultivars, and 12-14% in recently-released F₁ hybrid. A significant negative correlation (r=-0.789) was observed between the content of MTB-ITC and the water content of the tissues among cultivars. The result of sensory evaluation on grated radish showed that a cultivar with higher content of MTB-ITC was proportionately more pungent, supporting the idea that this substance is the pungent principle in roots of Japanese radish.

Contents of Pungent Principle in Roots of Japanese Radish (<i>Raphanus sativus</i> L.) Cultivars

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