Method for hydrolyzing straws by recoverable nanometer magnetic immobilized enzymes

The invention discloses a method for hydrolyzing straws by recoverable nanometer magnetic immobilized enzymes. The method includes adding a 0.1 mol/L buffer solution into pretreated straws for hydrolysis reaction to produce a solid-liquid mixture with a solid-liquid ratio of 1:3-1:20, wherein a pH value of the solid-liquid mixture ranges from 4 to 6; adding cellulase into the solid-liquid mixture, wherein the addition amount of the cellulase with the activity of 1-100 IU/g accounts for 0.1-0.5% of dry weight of the straws; conducting hydrolysis reaction for 24-72 hours at 40-60 DEG C so as to obtain a hydrolysis reaction solution. The method has the advantages that magnets are used for recovering the immobilized enzymes after hydrolysis, a recovery rate is between 80% and 100%, the enzymes can keep a certain activity after being recovered for more than 10 times, and the activity of the enzymes can be kept between 75% and 100%; a glucose solution obtained after hydrolysis reaction is used for fermenting ethyl