Oxidation of four PAH (25 μM each) by laccase (4 U/ml) in presence of the natural compounds veratryl alcohol (VA), HBA, phenylacetic acid (PAA), benzaldehyde (BA), anisaldehyde (AA), 4-hydroxybenzaldehyde (HBAld), and 4-hydroxybenzyl alcohol (HBAlc) at 1 mM each. Dashed lines indicate reactions with laccase only. Results are means and standard deviations.