Method for preparing xylooligosaccharide from black corncob

The invention provides a method for preparing xylooligosaccharide by using black corncobs, the method for efficiently preparing the xylooligosaccharide is established by using the black corncobs as raw materials, all the steps supplement one another, glucosidic bonds between hemicellulose and cellulose are broken firstly, then lignin is removed and degraded, and the xylooligosaccharide is obtained. The method comprises the following steps: hydrolyzing hemicellulose by using a compound enzyme, then mixing with a citric acid chelated zinc aqueous solution, removing free hemicellulose after hydrolysis under high-temperature spray explosion, carrying out selective enzyme digestion on the remaining hemicellulose under the action of the compound enzyme, and effectively degrading the hemicellulose into xylooligosaccharide, so that the yield of the obtained xylooligosaccharide is relatively high, and the conversion and removal rate of the hemicellulose and the removal rate of lignin are relatively high. 本发明提供一种利用黑玉米芯