Production of biomass of yeast cell R1 and R2 using sweet potato and cassava extract substrates in fermentor type air-lift scale 18 liters

Abstract

Abstract. Undari W, Susilowati A, Sugoro I. 2008. Production of yeast cells R1 and R2 biomass using sweet potato and cassava extract substrates in fermentor type air-lift scale 18 liters. Biofarmasi 6: 8-15. Increasing production and quality of meat and milk can be done by attention to nutrition, reproduction health, and livestock management. This research was conducted with the following objectives: (i) to determine the difference of production of biomass of yeast cell R1 by using sweet potato and cassava extract substrates in fermentor type air-lift scales 18 liters with R2; (ii) to determine the difference of production rate of biomass of yeast cell R1 by using sweet potato and cassava extract in fermentor type air-lift scales 18 liters and the consumption of glucose with R2; (iii) to determine the difference of yield x/s of yeast cell R1 by using sweet potato and cassava extract substrates in fermentor type air-lift scales 18 liters with R2; and (iv) to determine the difference of production efficiency of biomass of yeast cell R1 by using sweet potato and cassava extract substances in fermentor type air-lift scales 18 liters with R2. The research was conducted in July-September 2006 at the Nutrition, Reproduction and Wellness Laboratory of the Center for Applications of Isotope and Radiation Technology - National Nuclear Energy Agency (PATIR-BATAN), South Jakarta. Based on the research results, it can be determined that the production of yeast cells R1 and R2 biomass on sweet potato and cassava extract substrate were 0.65 g/L, 0.83g/L, 0.63 g/L, and 0.88 g/L, respectively. There was no significant difference in biomass production between yeast R1 and R2, either sweet potato or cassava extract. The production rate of biomass of yeast cell R1 and R2 and the consumption of glucose on sweet potato and cassava extract substrates were 0.04 g/L/day and 0.86 g/L/day, respectively; 0.06 g/L/day and 0.51 g/L/day, respectively; 0.05 g/L/day and 0.19 g/L/day, respectively; 0.08 g/L/day and 0.28 g/L/day, respectively. The biomass production and glucose consumption rate between yeast R1 and R2 showed no significant difference on sweet potato and cassava extract substrates. The yield x/s of yeast R1 and R2 on sweet potato and cassava extract substrates were 0.43 g/g, 0.61 g/g, 0.29 g/g, and 0.31 g/g, respectively. The yield x/s between yeast R1 and R2 showed no significant difference on sweet potato and cassava extract substrates. The production efficiency of biomass of yeast cells R1 and R2 on sweet potato and cassava extract substrates were 86.23%, 122.34%, 57.46%, and 61.18%, respectively. The biomass production efficiency between yeast R1 and R2 showed no significant difference, both on sweet potato and cassava extract substrates.