Article

Impact of surfactants on pretreatment of corn stover. Bioresour Technol

Center for Environmental Research and Technology, Chemical and Environmental Engineering Department, Bourns College of Engineering, University of California, 1084 Columbia Avenue, Riverside, CA 92507, USA.
Bioresource Technology (Impact Factor: 4.49). 03/2010; 101(15):5941-51. DOI: 10.1016/j.biortech.2010.03.003
Source: PubMed

ABSTRACT

Lignin in pretreated cellulosic biomass can non-productively adsorb cellulase, resulting in loss of a significant portion of this expensive protein. In addition, lignin interferes with the path for cellulase action, slowing down hydrolysis. Thus, the effectiveness of enzymatic hydrolysis of pretreated lignocellulosic biomass can be significantly enhanced if lignin is removed or effectively modified before adding enzymes. In this study, the enzymatic digestibilities of solids resulting from using the surfactants Tween-80, dodecylbenzene sulfonic acid, and polyethylene glycol 4000 during water-only or dilute acid pretreatment of corn stover at 140-220 degrees C were evaluated. All of these surfactants increased lignin removal during pretreatment and reduced non-productive binding of enzymes on the biomass surface, but Tween-80 increased enzymatic hydrolysis yields and enhanced total sugar recovery more than the other two. Surfactant pretreatment was found to improve lignin solubility, which could improve cellulose digestibility by reducing unproductive binding to enzyme, and also appeared to enhance performance by modifying the biomass surface.

Download full-text

Full-text

Available from: Charles E Wyman
    • "enzymatic saccharification of cellulose. One of the most important advantage of using surfactant as a pretreatment agent is that it will form emulsions that reduce lignin re-deposition back to biomass surface through interaction of surfactant with hydrophobic lignin during pretreatment so that less lignin is left on the biomass surface to non-productively adsorb or block enzyme during enzymatic hydrolysis.[5] The objective of the present study was to develop a novel integrated pretreatment strategy using biodiesel industry generated waste glycerol and surfactant for the effective removal of hemicelluloses and lignin from chili post-harvest residue as well as optimization of various process parameters affecting pretreatment and bioethanol production from the biomass hydrolyzate. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A novel crude glycerol assisted surfactant pretreatment was evaluated for bioethanol production from chili post-harvest residue. Among the various surfactants screened crude glycerol assisted polyethylene glycol (PEG) pretreatment was found to be more effective. Various process parameters affecting pretreatment were optimized. The optimum conditions of pretreatment were crude glycerol concentration of 0.55% w/w, PEG concentration of 4.5% w/w, biomass loading of 25% w/w and incubation time of 60 min. Under optimized conditions 0.459 g of reducing sugar per g of dry biomass (g/g) was observed. The hydrolyzate is devoid of major fermentation inhibitors like furfurals, 5-hydroxymethylfurfural and organic acids like citric acid, succinic acid and propionic acid. Fermentation of the non-detoxified hydrolyzate yielded 8.60 g of bioethanol per 100 g of dry biomass with a fermentation efficiency of 36.68%.
    No preview · Article · Nov 2015 · Biofuels
  • Source
    • "Surfactant molecules may cover the separated lignin in the aqueous solution and prevent its re-deposition on the surface of biomass[38]. In fact, amphiphilic molecules of surfactant could enhance its solubility through the formation of micelles around lignin cores[19]. Moreover, surfactant molecules can facilitate the separation of lignin from the biomass structure through reducing the interfacial tension between the lignin and water[39]. "

    Full-text · Article · Sep 2015 · Biochemical Engineering Journal
  • Source
    • "Acid, alkaline, thermal, and ultra-sonication are the most familiar pretreatment methods for food waste [20] [21] [22] [23]. A promising approach for using surfactants, especially nonionic ones, to improve enzymatic hydrolysis of particulate organic matter is needed to achieve a high hydrogen production [24]. A surfactant has the ability to modify substrate structure and make it more accessible to enzymes [25]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The influence of surfactant addition on the hydrogen fermentative of the organic fraction of municipal solid waste was extensively investigated under thermophilic conditions (55 ± 2 °C) in batch cultures. The addition of Tween 80® (T80) and polyethylene glycol (PEG 6000®) substantially improved hydrogen yields (HYs) resulting in 109.9 ± 7.1 and 113.8 ± 7.7 mlH2/gCarb.initial at T80 and PEG 6000® concentrations not exceeding 2.8% and 16.7 g/L, respectively. A combination of 2.8% T80 with 1.7 g/L PEG 6000® achieved slightly higher HYs of 116.7 ± 5.2 mlH2/gCarb.initial. An artificial neural network model reliably represented the relationship between the surfactant concentration and hydrogen production with a correlation coefficient (R2) of 0.980. Microbial community analysis of the batches supplemented with 2.8% T80 and 1.7 g/L PEG 6000® showed the dominance of the hydrogen-producing bacteria Enterobacter, Escherichia, Buttiauxella, and Pantoea. The study confirms the potential of surfactant addition for H2 production from wastes containing organics in a particulate form.
    Full-text · Article · Jul 2015 · Applied Energy
Show more