1992 Volume 39 Issue 7 Pages 625-628
Extraction of hemicellulose from corn bran under alkaline conditions using a twin screw extruder was examined. Extruding pressure was adjusted by a volume of NaOH solution added to the corn bran. Samples were supplied into the extruder by gravity feed. The pressure increased from l to 16 kg/cm2 with decreasing water content in corn bran. In the case that the amount of NaOH was fixed, extraction rates of hemicellulose did not increase against increasing pressure. The best extraction rate was attained when 0.5 or 1.0N NaOH was added at 2-2.5 times weights of corn bran. These results suggest that mixing and dispersion effects with viscosity fall inner the twin screw extruder are more important factors for extraction of hemicellulose than high pressure.
