In this research, the ATCC 9950 Candida utilis yeast strain capacity to bind the Mg²⁺ ions was studied. The yeast was cultivated in dynamic conditions (with aeration) in the YPD medium enriched with the MgSO₄·7H₂O or MgCl₂·6H₂O magnesium salts. The salts were being added in such an amount, that the Mg²⁺ content in the medium was 0.25 g/dm³; 0.5 g/dm³ or 1.25 g/dm³. The YPD medium was enriched with magnesium ions at the beginning of the cultivation or in the end of the logarithmic phase of yeast growth. In order to evaluate the stability of bonds of Mg²⁺ ions with yeast cells, the magnesium content was evaluated in the centrifuged yeast biomass that had and had not been washed with deionized water. The studied strain proved its capacity of permanent bonds with magnesium ions originating from the experimental mediums. MgCl₂·6H₂O added to the cultivation, favoured the binding of magnesium form the YPD medium by the yeast, but MgSO₄·H₂O added to the cultivation allowed obtaining higher biomass yield. The largest number of magnesium binding by biomass yeast cells (9,09 mg Mg²⁺/g d.w.) was obtained from YPD medium after 48-hour cultivation with chloric salt added in the amount of 1.25 g Mg²⁺/dm³ in the end of the logarithmic phase of yeast growth.

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