Extracellular Hydroxyl Radical-scavenging Ability of White Rot Fungion Lignocellulose Substance

The extracellular hydroxyl radical (·OH)-scavenging ability of three white-rot fungi of different species (K1:Ganoderma lucidum, B2: Pleurots sp., A3: Lentinula edodes) on two different lignocellulose substance (cornstalk powder, straw powder) was studied, and the main scavengers were searched. The results showed that: (1)white-rot fungi have the extracellular ·OH-scavenging ability during the whole course of lignocellulose degradation, and the scavenging ability was popular in white-rot fungi. In all three strains, L.edodes A3 has the superior extracellular ·OH-scavenging ability, and the cornstalk powder was more favorable than straw powder for ·OH-scavenger production. (2) submerged culture of L.edodes A3 on cornstalk substance got the maximum scavenging efficiency of 42.53% at the 8th day, and the crude exopolysaccharide (EPS) which accounted for 75.4% of the total ·OH removal, was the main extracellular scavenger.