an aldehyde + O2 + H2O <=> a carboxylate + H2O2 + H(+)
an aldehyde + o2 + h2o <=> a carboxylate + h2o2 + h(+)
an aldehyde + O2 + H2O <=> a carboxylate + H2O2 + H(+)
an aldehyde + o2 + h2o <=> a carboxylate + h2o2 + h(+)