Jongrungruangchok et
al. (2004) found a crude CH2Cl2 extract of M.
kaoliang KB20M10.2 grown on rice that was
sequentially subjected to Sephadex LH-20 and Si
gel chromatography, to yield two new azaphilone
yellow pigments, monascusone A and
monascusone B, together with two known
compounds, monascin and FK17-P2b2. However,
either crude ethanol yellow extract or its key
purified yellow pigment (monascusone A) could
serve as a strong antioxidant analyzed by FRAP
or DPPH assay (Harntrikanon, 2006).