Antimutagenic activity against trp-P-1 of the edible Thai plant, Oroxylum indicum vent.
Nakahara K1, Onishi-Kameyama M, Ono H, Yoshida M, Trakoontivakorn G.
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Abstract
A methanolic extract of Oroxylum indicum strongly inhibited the mutagenicity of Trp-P-1 in an Ames test. The major antimutagenic constituent was identified as baicalein with an IC50 value of 2.78+/-0.15 microM. The potent antimutagenicity of the extract was correlated with the high content (3.95+/-0.43%, dry weight) of baicalein. Baicalein acted as a desmutagen since it inhibited the N-hydroxylation of Trp-P-2.