A comparison of chemical pretreatment methods for improving saccharification of cotton stalks

Silverstein, Rebecca Anne; Chen, Ye; Sharma-Shivappa, Ratna R.; Boyette, Michael D.; Osborne, Jason A.

doi:10.1016/j.biortech.2006.10.022

Cited by 751 publications

(394 citation statements)

References 25 publications

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“…Different thermochemical pretreatments will cause removal of the hemicellulose fraction to different extents. Various reports on the extent of this removal have been published and show that this varies between the species of biomass and conditions used [1,2]. The insoluble polysaccharide fraction left after efficient separation of hemicelluloses is enriched in glucose, which on saccharification provides substrates similar to those used in Leonardo D. Gómez and Ruben Vanholme contributed equally in this work.…”

Section: Introductionmentioning

confidence: 99%

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

et al. 2014

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In order to examine the potential for coproduct generation, we have characterised chemical compounds released by a range of alkaline and acidic aqueous pretreatments as well as the effect of these pretreatments on the saccharification ability of the lignocellulosic material. Comparative experiments were performed using three biomass types chosen for their potential as second-generation biofuel feedstocks: maize stover, miscanthus and sugarcane bagasse. The release of lignin from the feedstock correlated with the residual biomass saccharification potential, which was consistently higher after alkaline pretreament for all three feedstock types.Alkaline pretreatment released more complex mixtures of pentose and hexose sugars into the pretreatment liquor than did acid pretreatment. In addition, complex mixtures of aromatic and aliphatic compounds were released into pretreatment liquors under alkaline conditions, in a temperaturedependent manner, but far less so under acidic conditions. We show that the three feedstocks characterised interact with the pretreatment conditions in a specific manner to generate different ranges of products, highlighting the need to tailor pretreatments to both the starting feedstock and desired outcomes.

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Section: Introductionmentioning

confidence: 99%

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

et al. 2014

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“…This method is efficient if agricultural waste being used rather than the wood materials [12]. The critical parameters for alkaline pretreatment are reaction temperature, pretreatment time and alkali loading [13]. Apart from that, the accessibility of surface area, the presence of lignin and hemicelluloses would be the key factors affecting the rate of enzymatic hydrolysis of cellulose [14], [15].…”

Section: Introductionmentioning

confidence: 99%

Sodium Hydroxide Pretreatment and Enzymatic Hydrolysis of Oil Palm Mesocarp Fiber

Iberahim¹,

Jahim²,

Harun³

et al. 2013

IJCEA

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Abstract-Sodium hydroxide pretreatment of oil palm mesocarp fiber (OPMF) was carried out with NaOH from 2% to 10% (w/v) at temperature 50 0 C and 70 0 C. The performances of pretreatments were evaluated based on total carbohydrate and reducing sugar including glucose, xylose and arabinose after enzymatic hydrolysis on the pretreated biomass. It was found that the enzymatic hydrolysis had significantly improved when 6% NaOH in 70 0 C applied in the pretreatment process. The highest total reducing sugars produced by means of commercial enzymes was achieved with the overall conversions of glucan and xylan of 87% and 60.73% respectively. The compositions of OPMF in this study are as follows (% g/g dry biomass): glucan, 28.8, xylan, 25.3, arabinan, 1.91, ethanol extractive, 6.32 and ash, 2.60.Index Terms-Enzymatic hydrolysis, glucose, NaOH pretreatment, oil palm mesocarp fiber.

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“…However, at a residence time of 120 min with all concentrations (0.5, 1, 1.5, and 2%), more than 70% (70.13-73.23%) delignification was observed, but at the same time loss of holocellulose content was also found. In an investigation, 65.63% of delignification was found at 2% NaOH concentration for 90 min (Silverstein et al, 2007). …”

Section: Study Of Naoh Pretreatmentmentioning

confidence: 99%

“…NaOH pretreatment is estimated to be one of the most effective chemicals for pretreatment of different lignocellulosic feedstocks, including sunflower hull, corn stover, cotton stalk, and sunflower stalk (Fox et al, 1989;MacDonald et al, 1983;Sharmas et al, 2002;Silverstein et al, 2007;Soto et al, 1994). The total solid residue recovery after pretreatment decreased as the residence time increased, which may be due to solubilization of lignin and sugars (that mainly composed of xylose).…”

Section: Study Of Naoh Pretreatmentmentioning

confidence: 99%

NaOH Pretreatment and Enzymatic Hydrolysis ofSaccharum spontaneumfor Reducing Sugars Production

Kataria

Ghosh

2014

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Ethanol from lignocellulosic material is the second generation biofuel production, which includes different initial steps of pretreatment and hydrolysis to form fermentable sugars. The aim of this study was to utilize Saccharum spontaneum (Kans grass, a perennial grass) for NaOH pretreatment and further hydrolysis with on-site produced cellulase enzyme that minimizes the cost of the overall process of bioethanol synthesis. Five percent (w/v) Kans grass was first pretreated with different concentrations of NaOH (0.5, 1. 1.5, and 2% w/v) at variable durations of time period (30, 60, 90, and 120 min) at 121 ı C. The pretreated biomass was further supplied with a crude mixture of cellulase enzyme (20 units/g biomass) obtained from Trichoderma reesei for saccharification. The crude mixture of enzyme is composed with CMCase, FPAse, and xylanase activities 1.41, 1.12, and 6.23, respectively. The best condition for total reducing sugars (350 mg/g) was found to be at 0.5% NaOH with 120 ı C where 70.75% of lignin removal was obtained and holocellulose (total carbohydrate) content was increased from 64.7 to 79.61%.

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A comparison of chemical pretreatment methods for improving saccharification of cotton stalks

Cited by 751 publications

References 25 publications

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

Side by Side Comparison of Chemical Compounds Generated by Aqueous Pretreatments of Maize Stover, Miscanthus and Sugarcane Bagasse

Sodium Hydroxide Pretreatment and Enzymatic Hydrolysis of Oil Palm Mesocarp Fiber

NaOH Pretreatment and Enzymatic Hydrolysis ofSaccharum spontaneumfor Reducing Sugars Production

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