A review on alkaline pretreatment technology for bioconversion of lignocellulosic biomass

Kim, Jun Seok; Lee, Y.Y.; Kim, Tae Hyun

doi:10.1016/j.biortech.2015.08.085

Cited by 1,235 publications

(573 citation statements)

References 46 publications

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“…Figure 2 shows the FTIR spectra of raw and pretreated cassava pulp at optimized pretreatment condition and the difference in the absorbance spectra of differently treated samples can be observed. The absorption bands at 3390-3420 cm 21 was observed to be more intense in microwave assisted chemical pretreatment. It was assigned to Hbonded OH groups stretching [23,24].…”

Section: Ftir Analysismentioning

confidence: 98%

“…Alkali pretreatment was conducted under mild conditions using mostly non-corrosive and non polluting chemicals. Alkali reagents can effectively solubilise lignin and hemicelluloses [21]. Sodium hydroxide (NaOH), which shows increasing dielectric loss tangents with increasing concentration and temperature, is an efficient reagent to interact with microwave [12].…”

Section: Effect Of Microwave Assisted Alkali Pretreatmentmentioning

confidence: 99%

“…The changes in the functional groups of raw materials before and after pretreatment were analyzed by Fourier-transform infrared spectroscopy (FTIR) (Bruker ALPHA, Germany). The spectra were recorded between 4000 and 600 cm 21 .…”

Section: Physical Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Physicochemical treatment for improving bioconversion of cassava industrial residues

Sudha¹,

Sivakumar

Sangeetha³

et al. 2017

Env Prog and Sustain Energy

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In the present study, a comparison of two types of microwave pretreatment such as microwave assisted alkali and microwave assisted acid were studied using cassava pulp as the substrate. The effect of pretreatment agent concentration, microwave power and pretreatment time on enzymatic saccharification was studied using a response surface method according to Central Composite design. Under optimized conditions, microwave assisted alkali pretreatment of cassava pulp with 2.27% NaOH at 125 W for 18 min followed by enzymatic hydrolysis gave reducing sugar yield of 0.472 g g 21 dry biomass, while microwave assisted acid treatment with 1.95% H 2 SO 4 at 135 W for 25 min showed reducing sugar yield of 0.306 g g 21 dry biomass. The yield from microwave assisted alkali was higher and was 2.7 times higher than that obtained with raw cassava pulp. Microwave assisted liquefaction of pretreated cassava pulp at 100 W for 30 min using amylase lowered the process time.

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Section: Ftir Analysismentioning

confidence: 98%

Section: Effect Of Microwave Assisted Alkali Pretreatmentmentioning

confidence: 99%

See 1 more Smart Citation

Physicochemical treatment for improving bioconversion of cassava industrial residues

Sudha¹,

Sivakumar

Sangeetha³

et al. 2017

Env Prog and Sustain Energy

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“…A variety of physical, chemical, and physicochemical pretreatment methods have been tested to overcome the recalcitrance of lignocellulose, improve enzyme efficiency, and increase the yield of sugars as described in several recent reviews (Kim et al 2016;Silveira et al 2015;Singh et al 2015;Zhang et al 2016). These pretreatments include dilute acid (Lloyd and Wyman 2005;Saha et al 2005;Schell et al 2003), hot water (Liu and Wyman 2004;Ruiz et al 2013), ammonia fiber expansion (Hoover et al 2014;Lau et al 2008;Murnen et al 2007), steam explosion (Grous et al 1986;Kaar et al 1998), lime (Chang et al 1997;Kim and Holtzapple 2005), organic solvent (Zhang et al 2007;Zhao et al 2009b), and pyrolysis and mechanical disruption (Mosier et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-tolerant microorganisms and microbial communities for lignocellulose conversion to bioproducts

Simmons

Singer

et al. 2016

Appl Microbiol Biotechnol

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Chemical and physical pretreatment of biomass is a critical step in the conversion of lignocellulose to biofuels and bioproducts. Ionic liquid (IL) pretreatment has attracted significant attention due to the unique ability of certain ILs to solubilize some or all components of the plant cell wall. However, these ILs not only inhibit enzyme activities, but also the growth and productivity of microorganisms used in downstream hydrolysis and fermentation processes.While pretreated biomass can be washed to remove residual IL and reduce inhibition, extensive washing is costly and not feasible in large-scale processes. IL tolerant microorganisms and microbial communities have been discovered from environmental samples and studies begun to elucidate mechanisms of IL tolerance. The discovery of IL tolerance in environmental microbial communities and individual microbes has lead to the proposal of molecular mechanisms of resistance. In this article, we review recent progress on discovering IL tolerant microorganisms, identifying metabolic pathways and mechanisms of tolerance, and engineering microorganisms for IL tolerance. Research in these areas will yield new approaches to overcome inhibition in lignocellulosic biomass bioconversion processes and increase opportunities for the use of ILs in biomass pretreatment.

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“…Like other vegetal bioresources, they are composed of cellulose, hemicellulose and lignin. However, fall leaves emerge as waste that must be collected especially in urban areas due to the inadequate industrial processing methods (Kim et al, 2016). Alkaline peroxide treatment was applied on many vegetal resources such as corncob (Su et al, 2015), sugarcane bagasse (Rabelo et al, 2014) and ray straw (Fang et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Isolation of cellulose and hemicellulose by using alkaline peroxide

Tezcan¹,

Atici²

2017

Natural and Engineering Sciences

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Fall leaves are biodegraded and composted naturally in forests but they are wastes for urban areas. Moreover, they are widely available cellulose sources but have limited applications. Alkaline peroxide treatment of bioresources is one of the most widely studied clean methods for both delignification and hemicellulose removal but there is no study about application of that method on fall leaves at room temperature. In this study, the effect of alkaline peroxide treatment of fall leaves at room temperature on hemicellulose recovery and cellulose delignification were investigated. Fall leaves (FL) were treated with 0.3-3.0 M NaOH + 0-3 M H2O2 at room temperature. Hemicellulose recovery and cellulose delignification values were analyzed. Hemicellulose recovery and cellulose delignification increased and yield decreased by increasing NaOH and H2O2 concentrations. Hemicellulose recovery and cellulose delignification reached to the maximum levels, 99.5% and 81.6% respectively, at 3M NaOH + 3M H2O2 treatment condition. The end products were confirmed by analytically, spectrally and morphologically. Wasted fall leaves were turned into useful hemicellulose and cellulose products by using clean alkaline peroxide treatment at room temperature. The products can be further processed by known methods into other industrial products.

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A review on alkaline pretreatment technology for bioconversion of lignocellulosic biomass

Cited by 1,235 publications

References 46 publications

Physicochemical treatment for improving bioconversion of cassava industrial residues

Physicochemical treatment for improving bioconversion of cassava industrial residues

Ionic liquid-tolerant microorganisms and microbial communities for lignocellulose conversion to bioproducts

Isolation of cellulose and hemicellulose by using alkaline peroxide

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