Enzymic saccharification of pretreated wheat straw. [Trichoderma reesei]
Studies of pretreatment of wheat and its subsequent saccharification by Trichoderma reesei cellulases are reported. Steam explosion was found to be the most effective of the pretreatment methods tested. Data are presented describing the effect of enzyme and substrate concentration on the rate and degree of hydrolysis. Significant inhibition of the cellulases was observed when sugar concentrations were 6% or higher. This inhibition increased when glucose and ethanol were present simultaneously. Adsorption of enzymes to the substrate was followed during a 24-h hydrolysis period. An initial rapid and extensive adsorption occurred, followed by a short desorption period that was followed in turn by a further increased adsorption peaking after 3 h. Intermediate removal of hydrolysate, particularly in combination with a second addition of enzyme, clearly improved the yield of saccharification compared to an uninterrupted hydrolysis over a 24-h period. Thus, a 74% yield of reducing sugars was obtained. Furthermore, an increase in the amount of recoverable enzymes was observed under these conditions. Evidence is presented that suggests that a countercurrent technique, whereby free enzymes in recovered hydrolysate are adsorbed onto new substrate, may provide a means of recirculating dissolved enzymes.
- Research Organization:
- Swedish Forest Products Research Lab., Stockholm
- OSTI ID:
- 5659321
- Journal Information:
- Biotechnol. Bioeng.; (United States), Vol. 27:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ETHANOL
BIOSYNTHESIS
FUNGI
PRODUCTIVITY
WHEAT
ENZYMATIC HYDROLYSIS
CELLULASE
ENZYME ACTIVITY
GLUCOSE
INHIBITION
ALCOHOLS
ALDEHYDES
CARBOHYDRATES
CEREALS
CHEMICAL REACTIONS
DECOMPOSITION
ENZYMES
GLYCOSYL HYDROLASES
GRASS
HEXOSES
HYDROLASES
HYDROLYSIS
HYDROXY COMPOUNDS
LYSIS
MONOSACCHARIDES
O-GLYCOSYL HYDROLASES
ORGANIC COMPOUNDS
PLANTS
SACCHARIDES
SOLVOLYSIS
SYNTHESIS
090222* - Alcohol Fuels- Preparation from Wastes or Biomass- (1976-1989)
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)