Transketolase can be used for synthesis of chiral intermediates and ca
rbohydrates. However the enzyme is strongly deactivated by the educts.
This deactivation depends on the reactor employed. An enzyme membrane
reactor allows the continuous production of L-erythrulose with high c
onversion and stable operational points. A productivity (space-time yi
eld) of 45 g L(-1) d(-1) was reached.