Comparison of different strains of the yeastYarrowia lipolytica for citric acid production from glucose hydrol

Abstract
Four commercial strains and two mutants of the yeast speciesYarrowia lipolytica were screened using batch fermentation. StrainY.lipolytica A-101-1.14 (induced with UV irradiation) was found to be the most suitable for citric acid production from glucose hydrol (39.9% glucose and 2.1% other sugars), a byproduct of glucose production from potato starch. The specific rate of total citric and isocitric acid production was 0.138 g/g.h, the yield on consumed glucose 0.93 g/g, and the productivity achieved was as high as 1.25 g/L.h All of the tested yeast strains were able to utilize only the glucose from the glucose hydrol medium. Thus, some residual higher oligosaccharides remained in the process effluent.