Efficient Co-Production of Xylooligosaccharides and Glucose from Vinegar Residue by Biphasic Phenoxyethanol-Maleic Acid Pretreatment

A new biphasic organic solvent, phenoxyethanol-maleic acid, was carried out to pretreat and fractionate vinegar residue into glucan, xylan lignin under mild conditions. Additional effects of key factors, temperature phenoxyethanol concentration, on residue, were evaluated. Under the system (0.5% maleic 60% phenoxyethanol), 140 °C cooking for 1 h, 80.91% cellulose retention in solid 75.44% hemicellulose removal 69.28% obtained. Optimal identified conditions resulted maximum XOS 47.3%. Then, enzymatically digested with a glucose yield 82.67% at 72 h addition 2.5 g/L bovine serum albumin. Finally, characterized by SEM, FTIR, XRD BET analysis. This work demonstrated acid pretreatment yielded XOS, fermentable sugar, high processibility.