Karetkin B.A. 1
Kataeva T.S. 1
Baurin D.V. 1
Grosheva V.D. 1
Shakir I.V. 1
Panfi lov V.I. 1
1 D. Mendeleyev University of Chemical Technology of Russia
The assessment of efficiency of pretreatment (acid-based hydrolysis under soft conditions) and the subsequent biodestruction of renewable secondary vegetable raw materials on the example of oil-extracting meal of sunflower seeds after isolation of protein fraction and wheat bran was carried out with use of factorial and central composite design. The study of biochemical structure of these raw materials showed that concentration of reducing substances in a hydrolyzate is expedient to consider as response function at hydrolysis of wheat bran, and it should be the concentration of total carbohydrates for meal. The regression equations showing dependence of the substratum yield and yeast biomass production from key factors of hydrolysis such as solvent: solid ratio, рН, temperature, and time of hydrolysis were obtained. Optimum values of the factors specified were determined: the solvent: solid ratio – 8,7:1, рН 2,0, the temperature of hydrolysis – 130,1°C, time of hydrolysis – 30 minutes for meal; the solvent: solid ratio – 5,5:1, рН 3,0, the temperature of hydrolysis –112,0°C, time of hydrolysis – 30 minutes for bran.