Increased erythritol production in fed-batch cultures of Torula sp by controlling glucose concentration

The effect of glucose concentration on erythritol production by Torula sp, was investigated, The maximum volumetric productivity of erythritol was obt ained at an initial glucose concentration of 300 g l(-1) in batch culture. The volumetric productivity was maximal at a controlled glucose concentrati on of 225 g l(-1), reducing the lag time of the erythritol production. A fe d-batch culture was established with an initial glucose concentration of 30 0 g l(-1) and with a controlled glucose concentration of 225 g l(-1) in med ium containing phytic acid as a phosphate source, In this fed-batch culture , a final erythritol production of 192 g l(-1) was obtained from 400 g l(-1 ) glucose in 88 h. This corresponded to a volumetric productivity of 2.26 g l(-1) h(-1) and a 48% yield.