effect of polyoxyethylene (80) sorbitan monooleate (tween 80) addition in alkaline pre-extraction of wheat straw on its extracted compounds

optimization of the isolation methods and utilization of the sugars present in the hydrolysates obtained from pre-hydrolyses of various lignocellulosic materials for production of new chemicals and energy is currently accounted for novel methods of biorefinery all over the world. in this study, effect of temperature (90 and 100 oc), koh concentration (2, 4 and 6 %) and polyoxyethylene (80) sorbitan monooleate (tween 80) (0.3 and 0.5 %) was investigated in alkaline pre-extraction of wheat straw on its extracted compounds. to hydrolyze the oligomers in the extracted liquor into monomeric sugars, a vial containing 1 ml of the extracted liquor and 20 ml 4% sulfuric acid was kept in an autoclave at 121◦c for one hour. results indicated that both weight loss of wheat straw chips and dissolved solids content in the extracted liquor increased by increasing temperature and koh concentration, meaning that sugars removal from wheat straw and total sugars in hydrolysate increased by increasing temperature and koh concentration. also, the sugars removal from wheat straw chips increased by addition of tween 80, in a manner that in equal concentration of koh, addition of tween 80 led to an increase in total sugars content. it is therefore concluded that addition of tween 80 can improve yield of sugars derived from hemicelluloses extraction without increasing alkali concentration, whereby environmental pollution may decline.