A combined sodium phosphate and sodium sulfide pretreatment for enhanced enzymatic digestibility and delignification of corn stover. (October 2016)

• Record Type: Journal Article
• Authors: Qing, Qing; Zhou, Linlin; Guo, Qi; Huang, Meizi; He, Yucai; Wang, Liqun; Zhang, Yue
• Is Part Of: Bioresource technology. Volume 218(2016)
• Page Start: 209
• Page End: 216
• Publication Date: 2016-10
• Subjects: Corn stover -- Na3PO4-Na2S pretreatment -- Enzymatic hydrolysis -- Structural characterization -- Delignification; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.06.063
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: A combined Na3 PO4 and Na2 S pretreatment on the digestibility of CS were evaluated. Under the optimal conditions, most carbohydrates were kept in the solids with a high delignification. 91.11% of the original polysaccharides can be converted into fermentable sugars. A strong correlation between lignin removal and the reducing sugar yield was observed. Abstract: Na3 PO4 and Na2 S were employed as efficient alkaline catalysts for the pretreatment of corn stover. To systematically obtain optimal conditions, the effects of critical pretreatment parameters including sodium phosphate concentration (1–4%), sulfidity (0–20%), pretreatment temperature (100–120 °C), and reaction time (20–60 min) on the reducing sugar yield of pretreated substrates were evaluated in a lab-scale using the response surface methodology. Pretreated under the sodium phosphate concentration of 4%, sulfidity of 10%, temperature of 120 °C, and reaction time of 40 min, the reducing sugar yield and glucose yield of the pretreated corn stover achieved 91.11% and 64.01%, respectively, with a moderate enzyme loading of 30 FPU/g substrate. Additionally, a strong correlation (R 2 = 0.971 and R 2 = 0.954) between the delignification and the reducing sugar yield (or glucose yield) was observed by this pretreatment method. These results evidently support that the combined Na3 PO4 -Na2 S pretreatment is an effective and feasible method for processing lignocellulosic biomass.