HPLC elution profile of the supernatant of growing C. orbiscindens cultures incubated under anoxic conditions for 22 h with 1 mM taxifolin and Ta1 (alphitonin) (a); for 3 h with 0.5 mM apigenin, Ap1 (phloretin), and Ap2 (naringenin) (b); and for 6 h with 0.5 mM luteolin, Lu1 (eriodictyol), and Lu2 [3-(3,4-dihydroxyphenyl)propionic acid] (c). mAU, milli-absorbance units.