Ethanol effects on the kinetics of a continuous fermentation with saccharomyces cerevisiae

Conference · Sat Nov 01 04:00:00 EST 1975

OSTI ID:7354053

Bazua, C D; Wilke, C R

Alcoholic fermentation by Saccharomyces cerevisiae ATCC 4126 was studied. The aim of this work was to find the effect of the product concentration (ethanol) on the specific rates of cell growth and alcohol production. The experiments were conducted in a continuous culture chemostat where glucose was a limiting substrate, and the data were always obtained at steady state. Some preliminary batch experiments were also done. A Monod type kinetic model was applicable. A noncompetitive type of product inhibition was found. The data showed that at an ethanol concentration above 93 g/l the cells neither grow nor produce ethanol. Empirical equations are proposed to represent the inhibitory effect studied. A comparison with previous research work is also presented. It is shown that the differences found are not only due to the various microorganisms used but also to the conditions of the experiments and the manner of analyzing the data obtained. (auth)

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7354053
• Report Number(s): LBL-4423; CONF-751150-5
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
090222* -- Alcohol Fuels-- Preparation from Wastes or Biomass-- (1976-1989)
550700 -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ALCOHOLS
BIOCHEMICAL REACTION KINETICS
BIOCONVERSION
BIOMASS
BIOSYNTHESIS
ENERGY SOURCES
ETHANOL
FERMENTATION
FUNGI
GROWTH
HYDROXY COMPOUNDS
INHIBITION
KINETICS
MICROORGANISMS
ORGANIC COMPOUNDS
PLANTS
REACTION KINETICS
RENEWABLE ENERGY SOURCES
SACCHAROMYCES
SACCHAROMYCES CEREVISIAE
SYNTHESIS
YEASTS