Use of dry extrusion coolers for gelatinizing grain starch. Final report. [Use of dry extrusion coolers for gelatinizing grain starch]
The use of dry extrusion cookers for gelatinizing grain starch has been investigated. It is possible to consistently achieve better conversion with extrusion than with standard batch methods. Best performance was achieved at high temperatures and low moisture content. The effect of temperature gradient along the barrel was also important and appeared to be related to the nature of starch being processed. The effect of substrate concentration, dextrose equivalence, and agitation on the conversion of starch to sugar by a commercially available glucoamylase has been investigated. The effect of alcohol and a typical fungicide is also reported. Rate was independent of the fungicide but considerably affected by starch concentration, dextrose equivalent, and alcohol percentage. Velocity was unaffected by agitation or background glucose level. Enzyme kinetics are defined and discussed. The traditional Michaelis-Menten equation describing enzyme conversion as a function of substrate concentration appears to be a satisfactory for substrate concentrations of 5% solids or less. An equation describing velocity over a substrate range from 0 to 27.5% by weight was determined and presented.
- Research Organization:
- Oklahoma State Univ., Stillwater (USA). Dept. of Agricultural Engineering
- DOE Contract Number:
- FG46-81R612032
- OSTI ID:
- 5567732
- Report Number(s):
- DOE/R6/12032-T1; ON: DE84003128
- Country of Publication:
- United States
- Language:
- English
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BIOCHEMICAL REACTION KINETICS
CARBOHYDRATES
CHEMICAL REACTIONS
DECOMPOSITION
ENZYMATIC HYDROLYSIS
ENZYMES
GLUCOSIDASE
GLYCOSYL HYDROLASES
HYDROLASES
HYDROLYSIS
KINETICS
LYSIS
O-GLYCOSYL HYDROLASES
ORGANIC COMPOUNDS
POLYSACCHARIDES
REACTION KINETICS
REAGENTS
SACCHARIDES
SOLVOLYSIS
STARCH
SUBSTRATES