Effect of different nitrogen sources on activities of UDPG-pyrophosphorylase involved in pullulan synthesis and pullulan production by Aureobasidium pullulans

► NaNO2 is a new nitrogen source for pullulan production. ► The relationship of nitrogen source and UDPG-pyrophosphorylase activity was investigated. ► Pullulan yield is high using NaNO2 as a new nitrogen source.