Strategy for dual production of bioethanol and D-psicose as value-added products from cruciferous vegetable residue

In this study, fermentable sugars and D-fructose were produced from cruciferous vegetable residue by enzymatic method without the use of either chemical or mechanical mechanisms. Production of D-psicose was effectively converted from hydrolyzed D-fructose in cabbage residue by D-psicose-3 epimerase; the presence of the borate increased the conversion rate by about two fold, and ethanol production yield was 85.7% of the theoretical yield. Both products, bioethanol and D-psicose, were successfully separated and purified by pervaporation and cation exchange chromatography, and their recovery yields were approximately 87% and 86.2%, respectively. (C) 2016 Elsevier Ltd. All rights reserved.