beta-lactose + O2 <=> lactobiono-1,5-lactone + H2O2
beta-lactose + o2 <=> lactobiono-1,5-lactone + h2o2
beta-lactose + O2 <=> lactobiono-1,5-lactone + H2O2
beta-lactose + o2 <=> lactobiono-1,5-lactone + h2o2