Wheat bran biorefinery – A detailed investigation on hydrothermal and enzymatic treatment

Extraction of arabinoxylans from wheat bran using hydrothermal processes assisted by heterogeneous catalysts

“…below 100 ºC) is not able to break the cross-links between the WUAXs and the wall matrix (Izydorczyk & Biliaderis, 2007). In order to improve the AXs extraction yield from different biomass, several techniques, such as hydrothermal treatments (Bobleter, 1994;Buranov & Mazza, 2010;Carvalheiro, Garrote, Parajó, Pereira, & Gírio, 2005;Dien et al, 2006;Garrote, Domínguez, & Parajó, 1999;Garrote, Domínguez, & Parajó, 2001;Garrote, Domínguez, & Parajó, 2002;Kim, Hendrickson, Mosier, & Ladisch, 2009;Lavarack, Griffin, & Rodman, 2000;Li, Converse, & Wyman, 2003;Maes & Delcour, 2002;Mok & Antal, 1992;Nabarlatz, Farriol, & Montané, 2004;Negahdar, Delidovich, & Palkovits, 2016;Reisinger et al, 2013;Shen & Wyman, 2011;Tekin et al, 2014), chemical-solvent extractions (Adams et al, 1955;Aguedo, Fougnies, Dermience, & Richel, 2014;Bataillon, Mathaly, Nunes Cardinali, & Duchiron, 1998;Buranov & Mazza, 2010;Choteborská et al, 2004;Doner, Chau, Fishman, & Hicks, 1998;Höije, Gröndahl, TØmmeraas, & Gatenholm, 2005;Hollmann & Lindhauer, 2005;Kim, Kreke, & Ladisch, 2013;Kusema et al, 2011;Lavarack, Griffin, & Rodman, 2002;Maes & Delcour, 2002;Shen & Wyman, 2011;Swennen, Courtin, Lindemans, & Delcour, 2006;Xu et al, 2006;Yao, Nie, Yuan, Wang, & Qin, 2015;…”

“…Hydrothermal treatments are performed in water under relatively high experimental conditions (150-230 ºC) (Garrote et al, 1999). These treatments are green processes and the yields achieved with them are relatively high (58-71%) (Dien et al, 2006;Garrote et al, 2001;Reisinger et al, 2013;Nabarlatz et al, 2004). Chemical methods using bases or acids are not environmentally-friendly and the separation process at the end of the extraction raises sharply the operating costs.…”

Processing, Valorization and Application of Bio-Waste Derived Compounds from Potato, Tomato, Olive and Cereals: A Review

“…It was demonstrated that different ethanol/water ratios were more effective in combination with enzymatic treatment [311]. The performance of the ethanol/water-enzyme process was similar to the hydrothermal-enzyme one, with about 85% of the feedstock dissolved into the liquid phase [273,311].…”

“…Based on previous data wheat is of great importance to the EU economy and wheat-derived by-products can be considered as a feedstock for biorefinery development. Current worldwide wheat global production is more than 700 million tons per year [271,273] and about one-fifth of the cultivated wheat is converted into bran (90 to 150 million tons/year) [273,274]. Currently, the bran is mainly used as a feed supplement, while minor amounts are applied in food [275].…”

“…The use of amylase and/or xylanase, cellulase and hemicellulase for monomeric sugars or oligosaccharides isolation, and of protease for peptides and proteins, has been largely reported [273,305,306,311]. Feruloyl-esterase was tested for FA and other phenolic acids release, but due to the extremely complicated structure of the cell wall, its combination with an array of enzymes having different digestion activities (e.g., xylanase) can be more effective [304].…”