High yield of fermentable sugar from paper mulberry woods using phosphoric acid plus hydrogen peroxide pretreatment: Multifactorial investigation and optimization

Bioethanol Production from Woody Biomass: Recent Advances on the Effect of Pretreatments on the Bioconversion Process and Energy Yield Aspects

“…The results demonstrated that under the chosen experimental conditions, an increase in enzyme loading (from 50 FPU/g to 70 FPU/g) for the same solid loading of 1.5% m/v improved the digestibility, as did an increase in solid loading (from 1.5% m/v to 5.2% m/v) for a fixed enzyme loading of 50 FPU/g. Moreover, a particularly high glucose yield of 443 mg glucose/g of pretreated wood was obtained in the study of Ajayo et al [115] after RSM optimization (H 3 PO 4 71.3% w/w + H 2 O2 4.84% w/w, 34.7 • C, 3.3 h). The study underlines that 100% hydrolysis could be achieved at a low H 3 PO 4 fraction (60%) and high temperature (50 • C), while a higher acid fraction (80%) and lower-level temperature (30 • C) decreased hydrolysis efficiency to 69%.…”

“…The PHP mixture showed more efficiency in the deconstruction of poplar rather than pine, successfully delignifying poplar at a rate of 83.59%. Similarly, studies carried out by Zhao et al [114] and Ajayo et al [115] employed PHP PT for the delignification of furniture boards and paper mulberry wood, respectively. In Zhao et al's study, 78.9-92.1% of the recovered cellulose was retrieved from the cellulose-rich fraction, which is a higher recovery rate than that reported by Wan et al (74.9% for poplar wood).…”

“…Chemically pretreated pine and poplar wood [53], sawdust mixture [126], hemp [126], spruce [133], olive wastes [131], and paper mulberry wood [115] were subjected to an enzymatic hydrolysis step separate from the fermentation phase, while chemically pretreated poplar wood, pine wood [50,68], and furniture boards [114] were subjected to SSF. In the study led by Bay et al [53], the structural analyses confirmed that amorphous parts are broken down by enzymes before the crystalline parts [180][181][182].…”