Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 68, Issue 1, Pages 193-199Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.68.193
Keywords
selenium; Se-methylselenocysteine; cancer prevention; plant sprout; high-performance liquid chromatography-inductively coupled plasma mass spectrometry
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Sprouts of several plants (10 families and 28 species) were cultivated in a high selenium environment, and the chemical species of selenium in these selenium-enriched sprouts were identified by using high-performance liquid chromatography-inductively coupled plasma mass spectrometry (HPLC-ICPMS). Cultivation of sprouts of kaiware daikon (type of radish) with 5.0 mug/ml or 10.0 mug/ml of selenium as selenite inhibited the growth. However, no abnormalities in the shape or color were apparent even in the sprouts exposed to 10.0 mug/ml of selenium. The selenium concentration in the sprouts of most plants examined was higher than that from environmental exposure. Among the types of selenium that were accumulated, a large part (69-98%) was extractable in 0.2 M HCl. Chemical analysis of selenium in the HCl extract showed that the main selenium species in all the sprouts examined was Semethylselenocysteine. In addition to Se-methylselenocysteine, selenomethionine, non-metabolized selenite, gamma-glutamyl-Se-methylselenocysteine and an unknown selenium compound were also detected in several high-selenium sprouts. Since higher anticarcinogenic activities of these monomethylated selenoamino acids have been observed, it is anticipated that such selenium-enriched sprouts will be used as a foodstuff for cancer prevention.
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