Compositional and structural changes in Phoenix canariensis and Opuntia ficus-indica with pretreatment: Effects on enzymatic hydrolysis and second generation ethanol production

Udeh, Benard Anayo; Erkurt, Emrah A.

doi:10.1016/j.biortech.2016.11.015

Cited by 22 publications

(9 citation statements)

References 28 publications

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“…The CrI increased as the concentration of NaOH was increased from 1% to 4%, however, it decreased with an increase in the autoclave temperature, from 110 °C to 130 °C, but not less than that of the raw biomass. The remarkable rise in CrI after pretreatment is in accordance with several earlier researches [2,16,19,21,30]. The rise in CrI is largely due to the decrease in amorphous fractions (mainly lignin and hemicellulose) during pretreatment, exposing the reactive cellulose [35].…”

Section: Resultssupporting

confidence: 89%

“…The glucan content of C. barbata in this study is in agreement with that of other previously studied invasive weed species, such as; Chromolaena odorata (36.2%), Pennisetum purpureum (32.0%) [29], A. aspera (45.9%), and S. acuta (46.9%) [7]. However, the lignin content is an indication for an effective pretreatment process to enhance accessibility to cellulose by cellulase enzymes [30]. Besides enhancing the enzymatic hydrolysis process, the amount of glucose that is recovered is very important and it should be considered in the selection of an effective pretreatment condition(s).…”

Section: Resultssupporting

confidence: 88%

“…Maximum glucose recovery of 30.7% was observed at this condition. The highest hydrolysis efficiency of 90.0% was also obtained at this condition, which is higher than that of other lignocellulosic biomass that was pretreated with NaOH, including rice straw (78.7%) [40], Phoenix canariensis (87.0%), Opuntia ficus-indic (84.5%) [30], and S. acuta (82.8%) [41]. It is also obvious from this study that a threshold lignin removal of 71% (Figure 2) in C. barbata at the optimum pretreatment condition, among other factors, is enough to allow for cellulolytic enzymes to infiltrate the cell wall.…”

Section: Resultsmentioning

confidence: 99%

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Combining Autoclaving with Mild Alkaline Solution as a Pretreatment Technique to Enhance Glucose Recovery from the Invasive Weed Chloris barbata

Obeng

Premjet

2019

Biomolecules

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Developing an optimum pretreatment condition to enhance glucose recovery assessed the potential of Chloris barbata, which is a common invasive weed in Thailand, as a feedstock for bioethanol production. Chloris barbata was exposed to autoclave-assisted alkaline pretreatment by using different sodium hydroxide (NaOH) concentrations (1% to 4%) and heat intensities (110 °C to 130 °C) that were dissipated from autoclaving. The optimum condition for pretreatment was determined to be 2% NaOH at 110 °C for 60 min. At this condition, maximum hydrolysis efficiency (90.0%) and glucose recovery (30.7%), as compared to those of raw C. barbata (15.15% and 6.20%, respectively), were observed. Evaluation of glucose production from 1000 g of C. barbata based on material balance analysis revealed an estimated yield of 304 g after pretreatment at the optimum condition when compared to that of raw C. barbata (61 g), an increase of five-fold. Structural analysis by the scanning electron microscopy (SEM) and X-ray diffraction (XRD) revealed the disruption of the intact structure of C. barbata and an increase in the cellulose crystallinity index (CrI), respectively. The results from this study demonstrate the efficiency of using C. barbata as a potential feedstock for bioethanol production.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Combining Autoclaving with Mild Alkaline Solution as a Pretreatment Technique to Enhance Glucose Recovery from the Invasive Weed Chloris barbata

Obeng

Premjet

2019

Biomolecules

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“…The overall XRD profile of biotreated and controlled rice straw samples is given in Table 3. The previous studies on rice straw and corn stover pretreatment of lignin removal showed higher crystallinity value after pretreatment (Wang et al 2016;Udeh and Erkurt 2017;Yao et al 2018;Zhang et al 2018). These results confirm again depolymerization of rice straw lignin by Ochrobactrum oryzae BMP03 bacterial strain isolated from wood feeding termite gut.…”

Section: Xrd Analysissupporting

confidence: 81%

“…The crystalline index value increased from 0.324 to 0.488 due to biotreatment. The partial degradation of lignin during biotreatment contributed to the increment leading to higher sugar proportion in biotreated rice straw samples (He et al 2008;Udeh and Erkurt 2017). Cellulose and hemicellulose are interlinked with lignin in raw rice straw biomass.…”

Section: Xrd Analysismentioning

confidence: 99%

Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

2018

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In this study, two bacterial strains capable of degrading lignin, cellulose, and hemicellulose were isolated from wood feeding termite. The isolates were identified by 16S rRNA gene sequencing. A bacterium Ochrobactrum oryzae BMP03 capable of degrading lignin was isolated on alkali lignin medium and Bacillus sp. BMP01 strain capable of degrading cellulose and hemicellulose were isolated on carboxymethyl cellulose and xylan media. The efficiency of bacterial degradation was studied by evaluating the composition of rice straw both before and after degradation. The appearance of new cellulose bands at 1382, 1276, 1200, and 871 cm −1 , and the absence of former lignin bands at 1726, 1307, and 1246 cm −1 was observed after biodelignification. This was further confirmed by the formation of channeling and layering of the microstructure of biodelignified rice straw observed under electron microscope. Maximum lignin removal was achieved in separate biodelignification and hydrolysis process after the 14th day of treatment by Ochrobactrum oryzae BMP03 (53.74% lignin removal). Hydrolysis of the biodelignified rice straw released 69.96% of total reducing sugars after the 14th day hydrolysis by Bacillus sp. BMP01. In simultaneous delignification and hydrolysis process, about 58.67% of total reducing sugars were obtained after the 13th day of biotreatment. Separate delignification and hydrolysis process were found to be effective in lignin removal and sugar released than the simultaneous process. The bacteria, Bacillus sp. BMP01, has the ability to degrade hemicellulose and cellulose simultaneously. Overall, these results demonstrate that the possibility of rice straw bioconversion into reducing sugars by bacteria from termite gut.

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Opuntia spp. as a Source of Sugars for the Ethanol Production

Téllez‐Jurado

Pérez-Cadena

Texco-López

et al. 2021

Opuntia Spp.: Chemistry, Bioactivity and Industrial Applications

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Compositional and structural changes in Phoenix canariensis and Opuntia ficus-indica with pretreatment: Effects on enzymatic hydrolysis and second generation ethanol production

Cited by 22 publications

References 28 publications

Combining Autoclaving with Mild Alkaline Solution as a Pretreatment Technique to Enhance Glucose Recovery from the Invasive Weed Chloris barbata

Combining Autoclaving with Mild Alkaline Solution as a Pretreatment Technique to Enhance Glucose Recovery from the Invasive Weed Chloris barbata

Biodelignification and hydrolysis of rice straw by novel bacteria isolated from wood feeding termite

Opuntia spp. as a Source of Sugars for the Ethanol Production

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