Comparison of Sodium Hydroxide and Potassium Hydroxide Followed by Heat Treatment on Rice Straw for Cellulase Production under Solid State Fermentation

Ong, Lisa Gaik Ai; Chuah, Cheng Hock; Chew, Ai Lan

doi:10.3923/jas.2010.2608.2612

Cited by 22 publications

(12 citation statements)

References 9 publications

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“…Alkaline pre‐treatment involves the processes with various alkalis or bases such as NaOH, KOH, aqueous ammonia (including Ammonia Recycle Percolation (ARP) and aqueous ammonia soaking), and lime to pre‐treat biomass. It is believed that during alkaline pre‐treatment the intermolecular ester bonds cross‐linking xylan hemicellulose and lignin are saponified, thus resulting in delignification of biomass .…”

Section: Mechanisms Of Different Pre‐treatments To Increase the Enzymmentioning

confidence: 99%

Biomass recalcitrance. Part II: Fundamentals of different pre‐treatments to increase the enzymatic digestibility of lignocellulose

Zhao

Zhang

Liu

2012

Biofuels Bioprod Bioref

251

158

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A number of pre-treatment methods have been developed during the last few decades to overcome biomass recalcitrance. Although the mechanisms of these pre-treatments are different, the fi nal objective is the sameincreasing cellulose accessibility to cellulase enzymes. Generally, pre-treatment is the process to disrupt the compact structure of lignocellulosic biomass and expose cellulose fi bers, which can be achieved by mechanical comminution, chemical modifi cations of biomass compositions, biological degradation, or a combination of these methods.After pre-treatment, the accessible surface area is increased resulting in the enhancement of cellulose digestibility.In this paper, we review the recent progress of the fundamental researches of various biomass pre-treatment processes, especially on how these pre-treatments alter chemical composition and physically change cell wall structure. Understanding these changes would be helpful to further optimize existing pre-treatments, and would aid in developing novel pre-treatment methods.

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Section: Mechanisms Of Different Pre‐treatments To Increase the Enzymmentioning

confidence: 99%

Biomass recalcitrance. Part II: Fundamentals of different pre‐treatments to increase the enzymatic digestibility of lignocellulose

Zhao

Zhang

Liu

2012

Biofuels Bioprod Bioref

251

158

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“…Numerous hydroxides have been studied for alkaline biomass pretreatment, but sodium hydroxide (Nlewem and Thrash Jr, 2010;Silverstein et al, 2007;Varga et al, 2002), potassium hydroxide (Bales et al, 1979;Ong et al, 2010;Sharma et al, 2013), and calcium hydroxide (Kaar and Holtzapple, 2000;Sirohi and Rai, 1998;Xu et al, 2010a) are the most common with sodium hydroxide being the most extensively studied. For the differing alkaline pretreatment options, the physical/chemical composition of the biomass and pretreatment conditions (chemical used, chemical concentration, moisture content, temperature, pH, and duration of pretreatment) are influential in determining the final yields of glucose available to be transformed into products (Chen et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

A molar basis comparison of calcium hydroxide, sodium hydroxide, and potassium hydroxide on the pretreatment of switchgrass and miscanthus under high solids conditions

Rodrigues

Jackson

Montross

2016

Industrial Crops and Products

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Pretreatment is an essential step in the formation of liquid biofuels. Switchgrass and miscanthus were pretreated using calcium hydroxide, potassium hydroxide, and sodium hydroxide at an equivalent hydroxyl concentration (0.46 g OH-/g dry biomass), at a solids content of 40%, and two temperatures (25 and 50 °C) for seven days. The cellulose, hemicellulose, and lignin composition before and after pretreatment were quantified according to the standard procedures developed by the National Renewable Energy Laboratory. After pretreatment, enzyme hydrolysis was performed at 50 °C in a shaking

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“…Alkaline pretreatment is believed to cause swelling of the lignocellulosic structure, leading to an increase in internal surface area, separation of structural linkage between lignin and carbohydrates, and the disruption of lignin structure (Ong et al 2010;Kashaninejad and Tabil 2011). As described in the literature, microwave treatment produces a rapid volumetric heating throughout the material, resulting in alteration of physio-chemical characteristics of the material, which enables and accelerates the breaking down of the lignin-hemicellulose complex and increases the exposure of cellulose surface to cellulase (Ma et al 2009;Jackowiak et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Comparison of Pretreatment Strategies for Conversion of Coconut Husk Fiber to Fermentable Sugars

Ding¹,

Hii²,

Ong³

2012

BioResources

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In the present study, coconut husk was employed as biomass feedstock for production of bioethanol, due to its abundance in Malaysia. Due to the complex structures of coconut husk, a pretreatment process is crucial in extracting fermentable sugars from the embedded cellulose matrix for subsequent ethanol fermentation process. The ground coconut husk was subjected to three different pretreatment processes inclusive of thermal, chemical, and microwave-assisted-alkaline techniques, prior to enzymatic hydrolysis and fermentation process. The composition profile of coconut husk was significantly altered upon the microwave-assistedalkaline treatment as compared to the untreated sample, with the cellulose content increasing from 18-21% to 38-39% while lignin content decreased from 46-53% to 31-33%. Among the pretreatment methods applied, enzymatic hydrolysis of coconut husk pretreated by microwaveassisted-alkaline method recorded the highest yield of fermentable sugars, 0.279 g sugar/g substrate. SEM imaging showed the obvious and significant disruption of coconut husks' structure after microwaveassisted-alkaline pretreatment. In conclusion, by employing suitable pretreatment technique in treating the lignocellulosic materials of coconut husk, the extracted fermentable sugar is a potential substrate for bioethanol production.

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Comparison of Sodium Hydroxide and Potassium Hydroxide Followed by Heat Treatment on Rice Straw for Cellulase Production under Solid State Fermentation

Cited by 22 publications

References 9 publications

Biomass recalcitrance. Part II: Fundamentals of different pre‐treatments to increase the enzymatic digestibility of lignocellulose

Biomass recalcitrance. Part II: Fundamentals of different pre‐treatments to increase the enzymatic digestibility of lignocellulose

A molar basis comparison of calcium hydroxide, sodium hydroxide, and potassium hydroxide on the pretreatment of switchgrass and miscanthus under high solids conditions

Comparison of Pretreatment Strategies for Conversion of Coconut Husk Fiber to Fermentable Sugars

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