Abstract. The antimutagenic activity of Sesbania javanica Miq. or Sano, an edible vegetable flower
DMSO extract against aflatoxin B1 (AFB1) benzo (a) pyrene [B(a)P], was evaluated by means of the
Ames’ test. The Sesbania javanica Miq. flower DMSO extract showed a strong inhibitory effect against
AFB
1 and B(a)P mutagens. A search to isolate the major flavonoid in Sesbania javanica Miq. flower
extract found the flavonol glycoside, Quercetin 3-2G-rhamnosylrutinoside, which was confirmed by
its physicochemical properties as a major constituent of the flower. Quercetin 3-2Grhamnosylrutinoside (207 µg/plate) also showed a strong inhibitory effect against AFB1 and B(a)P
with a more than 70% inhibition rate.