Alkaline and alkaline peroxide pretreatments at mild temperature to enhance enzymatic hydrolysis of rice hulls and straw

Cabrera, Emir; Muñoz, Marı́a; Martín, Ricardo Isaac Pérez; Caro, Ildefonso; Curbelo, Caridad; Díaz, Ana Belén

doi:10.1016/j.biortech.2014.05.103

Cited by 108 publications

(49 citation statements)

References 29 publications

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“…New technologies have been developed to enhance the process of biomass accessibility. Among them, there are processes involving supercritical fluids (Okajima and Sako, 2014), acid or alkaline treatments (Cabrera et al, 2014;Moe et al, 2012), steam explosion (Liu et al, 2013) and high-intensity ultrasound (Villa-Vélez et al, 2015b).…”

Section: Introductionmentioning

confidence: 99%

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Polachini

Carvalho

Telis‐Romero

2017

Braz. J. Chem. Eng.

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-The benefits of high-intensity ultrasound in diverse processes have stimulated many studies based on biomass pretreatment. In order to improve processes involving ultrasound, a calorimetric method has been widely used to measure the real power absorbed by the material as well as the cavitation effects. Peanut shells, a byproduct of peanut processing, were immersed in acidified aqueous solutions and submitted to an ultrasonic field. Acoustic power absorbed, acoustic intensity and power yield were obtained through specific heat determination and experimental data were modeled in different conditions. Specific heat values ranged from 3537.0 to 4190.6 J·kg -1 ·K -1 , with lower values encountered for more concentrated biomass suspensions. The acoustic power transmitted and acoustic intensity varied linearly with the applied power and quadratically with solids concentration, reaching maximum values at higher applied nominal power and for less concentrated suspensions. A power yield of 82.7% was reached for dilute suspensions at 320 W, while 6.4% efficiency was observed for a concentrated suspension at low input energy (80 W).

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Section: Introductionmentioning

confidence: 99%

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Polachini

Carvalho

Telis‐Romero

2017

Braz. J. Chem. Eng.

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“…Although this has been required to reach a satisfactory biodegradation of other materials as lignocellulosic structure got opened up and the available surface area increase (Subhedar and Gogate, 2014;Singh et al, 2015). These results might be attributed to the influence of other factors such as the easy biodegradability of native straw and the high carbohydrate removal during acid pretreatment as well (Cabrera et al, 2014). As can be seen in Fig.…”

Section: Acid Pretreatmentmentioning

confidence: 91%

“…It is well known that high lignin removal enhances enzyme action by increasing the disruption of biomass structure (Limayema and Ricke, 2012) and reducing the irreversible adsorption of hydrolytic enzymes on lignin surface (Wang et al, 2011). Moreover, high hemicelluloses retention increases polysaccharide availability for the following enzymatic hydrolysis (Cabrera et al, 2014).…”

Section: Alkaline Pretreatment At 121°cmentioning

confidence: 99%

“…Furthermore, alkaline pretreatment can operate in some cases at mild temperature and atmospheric pressure, not being necessary expensive specialized reactors (Cabrera et al, 2014). The mechanism by which this pretreatment enhances enzymatic saccharification appears to involve a release or redistribution of lignin due to the degradation of ester bonds and cleavage of glycosidic linkages in the cell wall matrix.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of industrially viable pretreatments to enhance soybean straw biodegradability

Cabrera

Muñoz

Martín

et al. 2015

Bioresource Technology

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“…Increasing H 2 O 2 concentration (2.5-5.0% H 2 O 2 concentration) led to higher sugar yield after enzymatic hydrolysis of the pretreated solid (Fig. 1b) [23]. However, excessive usage of peroxide concentration could also lead to the low recovery of cellulose [24].…”

Section: Influences Of H2o2 Concentration On Sugar Releases In Liquidmentioning

confidence: 99%

Effect of Combination of Liquid Hot Water System and Hydrogen Peroxide Pretreatment on Enzymatic Saccharification of Corn Cob

Upajak¹

2018

GEOMATE

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Alkaline hydrogen peroxide pretreatment is an effectively enhance the increasing enzymatic digestibility of lignocellulosic biomass for conversion to fuels and chemicals in the biorefinery processes. In this study, effects of H 2 O 2 on monomeric sugar in the liquid fraction during hydrogen peroxide pretreatment and sugar after enzymatic hydrolysis from corncobs were studied under varying reaction conditions. The temperature (30-120 o C) and H 2 O 2 concentration (2.5-10%) efficiently promoted sugar yield in the piqued fraction and improved enzymatic hydrolysis of pretreated solids. The optimal condition for H 2 O 2 pretreatment of corncob (H 2 O 2 concentration of 5% using 60 o C for 2 h) increased hemicellulose solubilization into the aqueous phase, resulting into the maximized pentose yield of 61.88% (xylose + arabinose) in the aqueous phase. H 2 O 2 pretreatment under the optimal conditions at 60 o C for 2 h, leading to the enhance glucose yield from enzymatic hydrolysis of the pretreated biomass using 10 FPU/g CelluclastTM (85.66 %) and small amount of formation of inhibitory by-products. Combined with glucose in the aqueous phase, this resulted in the maxima 95.61% glucose recovery from the native corncob. This was related to changes in crystallinity and surface area of the pretreated biomass. Scanning electron microscopy (SEM) showed disruption of the intact biomass structure resulting increasing enzyme's accessibility to the cellulose microfibers which showed higher crystallinity index compared to the native biomass as shown by X-ray diffraction with a marked increase in surface area as revealed by BET measurement. The results provided efficiency of H2O2 pretreatment on increasing sugar recovery and an efficient approach for its processing in biorefinery industry.

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Alkaline and alkaline peroxide pretreatments at mild temperature to enhance enzymatic hydrolysis of rice hulls and straw

Cited by 108 publications

References 29 publications

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Comparison of industrially viable pretreatments to enhance soybean straw biodegradability

Effect of Combination of Liquid Hot Water System and Hydrogen Peroxide Pretreatment on Enzymatic Saccharification of Corn Cob

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