FERMENTATIVE TECHNOLOGICAL RESEARCH FOR OBTAINING ZINC ENRICHED YEASTS
The influence of inorganic zinc solution at different time of cultivation on zinc accumulated in yeast biomass was tested. It has been noticed that there are yeasts which ferment glucose and sucrose as carbon source. A yeast (wine and beer) consortium can be the solution for fermentation of glucose and sucrose in order to develop a high content in biomass weight. It has been observed that the total zinc in yeast biomass obtained at pilot level was 1100-1760 mg/kg and the organic zinc 420-720 mg/kg. For control samples (spent brewing yeast) was found 68 mg/kg yeast total Zn and 48-68 mg/kg yeast organic zinc.
The wet yeast biomass enriched with zinc was used to be mixed with wet spent brewing yeast biomass. After the mixture was obtained, the samples were dried using a drum dryer and were analyzed for the content in total and organic zinc. For mixture, the content of total zinc was 90 mg/kg yeast and 70-90 mg/kg/yeast organic zinc.