M. G. Kurbanova1, K. A. Shevyakova2
1Kemerovo State Agricultural Institute, ul. Markovtseva, 5, Kemerovo, 650056, Russian Federation
2Kemerovo State University, ul. Krasnaya, 6, Kemerovo, 650000, Russian Federation
Abstract. Optimal parameters of vacuum dehydration were selected to achieve the greatest efficiency of the drying process of hydrolysates of serum proteins. The maximum permissible heating temperature and the residual pressure were determined on the example of 12 samples of hydrolysates. Samples were preliminarily subjected to condensation in an ultrafiltration unit to the content of dry matter of 60%. The heating temperature was 40, 50, 60 and 70 C; there were three samples in each variant. Based on the results of the observations, the curves of the dependences of the change in the relative mass of the hydrolysates, the temperature in the chamber and of the product, and the density of the heat flux on the heating temperature were plotted. The temperature in the chamber reached the set value, respectively, in 30, 50, 70 and 90 minutes, the product temperature – in 50, 80, 90 and 100 minutes. The deepest removal of moisture from the hydrolysate was observed at a temperature of 50 C, with the final moisture content in the product of 4.7%, the duration of the process was (220 ± 15) min. With increasing temperature, due to the high drying rate, a burnt layer formed, which prevented free migration of moisture from the deep layers to the surface. Based on the results of an organoleptic evaluation of the quality of the hydrolysate, the product that was dried at the temperature of 50 C received the highest score (37 points). With a decrease and increase in temperature, the taste and smell worsened. The lowest specific energy consumption was observed at a pressure of 9–10 kPa. When the residual pressure was increased, the rate of moisture removal from the product decreased. Dehydration of hydrolysate of serum proteins is advisable at a temperature in the chamber of 50 C and a residual pressure of 9–10 kPa, which provides the most rational ratio of the quality of the product obtained, the drying time and the specific energy consumption.
Keywords: hydrolysate of serum proteins; amino acids; protein-containing additives; vacuum drying.
Author Details: M. G. Kurbanova, D. Sc. (Tech.), assoc. prof. (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); K. A. Shevyakova, post graduate student.
For citation: Kurbanova M. G., Shevyakova K. A. Investigation of Parameters of Vacuum Drying for Hydrolysates of Serum Proteins. Dostizheniya nauki i tekhniki APK. 2018. Vol. 32. No. 7. Pp. 86–90 (in Russ.). DOI: 10.24411/0235-2451-2018-10721.