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Antioxidant Constituents of Radish
Sprout (Kaiware-daikon), Raphanus sativus L.
J Agric Food Chem. 2003 Dec 31;51(27):8061-6.
Takaya Y, Kondo Y, Furukawa T, Niwa M.
Faculty of Pharmacy, Meijo University, Tempaku, Nagoya, 468-8503, Japan.
Methanol extracts of 11 kinds of commonly available vegetables were examined for
hydroxyl radical scavenging potency using the bleomycin-Fe method. In this
method, the iron ion and bleomycin in water form hydroxyl radicals, and the
scavenging activity is monitored by the modified thiobarbituric acid method. All
extracts showed scavenging capacity, even though the activity of some of them
was lower than that of l-ascorbic acid. Those vegetables were classified into
three groups according to their activity, groups showing strong activity,
moderate activity, and weak activity, as compared to the activity of l-ascorbic
acid at the same concentration. Among them, the methanol extract of radish
sprout (Japanese name "kaiware-daikon") exhibited the highest potency (1.8 times
as l-ascorbic acid). Then, we investigated the constituents of the methanol
extract of radish sprout and the contribution to the overall activity of each
compound by examining their activity. As the result, several kinds of sinapinic
acid esters and flavonoids were isolated with high radical scavenging potency,
which must contribute substantially to the activity.
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