Influence of media components concentration was carried out for the evaluation of biosynthesis of citrate and invertase by Y. lipolytica strain A-101-B56-5 from sucrose as a cheap substrate. The concentration of components was designed in the Design Expert 8 software. All experiments were performer as batch cultures using microtiter plates in Bioscreen C apparatus. Amoung 37 media of different composition (1) the highest amount of biomass (OD_420-580nm = 1.9) was obtained in the medium with high amount of yeast xtract, (2) the highest extracellular invertase activity (63.9 U/l) in the medium with the highest sucrose concentration, (3) the highest concentration of citrate (0.288 g/l) in medium where low concentration of both ammonium chloride and yeast extract were used (the highest carbon to nitrogen ratio – C/N). No common medium was selected for simultaneous biosynthesis of all analyzed products. However, the optimum compositions of media for separate processes were obtained and may be used during biosynthesis of the compounds of interest in the bioreactor cultures using Y. lipolytica A-101-B56-5 strain and sucrose as a cheap substrate.

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