SIMION ANDREI IONUŢ 1, GRIGORAŞ CRISTINA – GABRIELA 2 1,2 “Vasile Alecsandri” University of Bacău, Department of Chemical and Food Engineering, 157 Calea Mărăşeşti, 600115 Bacău, Romania,
e-mail: cristina.grigoras@ub.ro
Fodder yeasts are successfully utilized to feed animals since they are considered a rich source of well digested protein and vitamins. The study aimed to find new carbon sources for fodder yeast development with viable economic effects while reducing the pollution to the environment by capitalisation of wastewaters with high monosaccharides content from pulp and paper industry and by employing a hydrolytic product obtained from sugar beet pulp. Candida utilis yeast strain was used as inoculum. The fabrication recipe was established with the help of Response Surface Methodology by optimising the amount of ingredients and having as response functions protein, biomass and residual sugar. The found optimized values were: 24 g/L zinc reducing sugar, 1038 mg/L nitrogen and 420 mg/L phosphorous. In these conditions the final product had 50.98% protein content, w/w and 6.49 g/L biomass, w/w with a consumption of reducing sugar of 92.66%.
