Enzymic saccharification of pretreated wheat straw. [Trichoderma reesei]

Journal Article · Tue Jan 01 04:00:00 EST 1985 · Biotechnol. Bioeng.; (United States)

DOI:https://doi.org/10.1002/bit.260270515· OSTI ID:5659321

Vallander, L; Eriksson, K E

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), Journal Name: Biotechnol. Bioeng.; (United States) Vol. 27:5; ISSN BIBIA
• Country of Publication: United States
• Language: English

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ALCOHOLS
ALDEHYDES
BIOSYNTHESIS
CARBOHYDRATES
CELLULASE
CEREALS
CHEMICAL REACTIONS
DECOMPOSITION
ENZYMATIC HYDROLYSIS
ENZYME ACTIVITY
ENZYMES
ETHANOL
FUNGI
GLUCOSE
GLYCOSYL HYDROLASES
GRASS
HEXOSES
HYDROLASES
HYDROLYSIS
HYDROXY COMPOUNDS
INHIBITION
LYSIS
MONOSACCHARIDES
O-GLYCOSYL HYDROLASES
ORGANIC COMPOUNDS
PLANTS
PRODUCTIVITY
SACCHARIDES
SOLVOLYSIS
SYNTHESIS
WHEAT