Kinetic models for growth and product formation on multiple substrates |
| |
Authors: | Yun Joong Kwon Cady R Engler |
| |
Institution: | (1) Department of Food Science and Biotechnology, Kyonggi University, 442-760 Suwon, Korea;(2) Department of Biological and Agricultural Engineering, Texas A&M University, 77843-2117 College Station, TX, USA |
| |
Abstract: | Hydrolyzates from lignocellulosic biomass contain a mixture of simple sugars; the predominant ones being glucose, cellobiose
and xylose. The fermentation of such mixtures to ethanol or other chemicals requires an understanding of how each of these
substrates is utilized.Candida lusitaniae can efficiently produce ethanol from both glucose and cellobiose and is an attractive organism for ethanol production. Experiments
were performed to obtain kinetic data for ethanol production from glucose, cellobiose and xylose. Various combinations were
tested in order to determine kinetic behavior with multiple carbon sources. Glucose was shown to repress the utilization of
cellobiose and xylose. However, cellobiose and xylose were simultaneously utilized after glucose depletion. Maximum volumetric
ethanol production rates were 0.56, 0.33, and 0.003 g/L-h from glucose, cellobiose and xylose, respectively. A kinetic model
based on cAMP mediated catabolite repression was developed. This model adequately described the growth and ethanol production
from a mixture of sugars in a batch culture. |
| |
Keywords: | kinetic model ethanol fermentation multiple substrates |
本文献已被 SpringerLink 等数据库收录! |
|