Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 50, Issue 23, Pages 6704-6709Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf020575a
Keywords
quinone reductase; phase II enzyme; antioxidant; chemopreventive; Hepa 1c1c7 cells; beetroot; betalains
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Free-radical scavenging, reducing, and phase 11 enzyme-inducing activities of aqueous and 5% aqueous ethanol extracts of freeze-dried root tissue of four beet (Beta vulgaris L.) strains (red, white, orange, and high-pigment (red) phenotypes) were determined. Aqueous and ethanolic tissue extracts of the regular and high-pigment red phenotypes were most capable of inhibiting metmyoglobin/H2O2-mediated oxidation of 2-2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) and 2,2'-azobis(2-amidinopropane) dihydrochloride (AAPH)-mediated bleaching of beta-carotene. These same extracts were also most efficient at reducing ABTS radical cation and inducing quinone reductase in murine hepatoma (Hepa 1c1c7) cells in vitro.
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