Effect of pH on the Dehydrogenative Polymerization of Monolignols by Laccases from and .

Dehydrogenative polymerization of coniferyl alcohol (CA) and sinapyl alcohol (SA) was conducted using commercial laccases, fungal laccase from () and plant laccase from (), at pH 4-7 to investigate how the enzymatic polymerization of monolignols differs between these two laccase systems. The enzyme activity of was the highest at pH 4, whereas that of was the highest at pH 7. A dehydrogenation polymer (DHP) was obtained only from CA in both laccase systems, although the consumption rate of SA was higher than that of CA.