Integrated chemical and multi-scale structural analyses for the processes of acid pretreatment and enzymatic hydrolysis of corn stover

Chen, Longjian; Li, Junbao; Lu, Minsheng; Guo, Xiaomiao; Zhang, Haiyan; Han, Lujia

doi:10.1016/j.carbpol.2015.12.079

Cited by 66 publications

(34 citation statements)

References 47 publications

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“…The crystallinity index (CrI) is an important indicator closely related to enzymatic digestibility because it could reflect biomass crystallinity. It could also indirectly indicate the amorphous phase signal of the biomass such as lignin, hemicellulose, and cellulose domains 38 , 46 , 47 . The CrI of raw, pretreated, and enzyme-hydrolyzed WS is shown in Figure 2 .…”

Section: Resultsmentioning

confidence: 99%

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Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Zheng

Zhou

Wang

et al. 2018

Sci Rep

157

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Wheat straw (WS) is a potential biomass for production of monomeric sugars. However, the enzymatic hydrolysis ratio of cellulose in WS is relatively low due to the presence of lignin and hemicellulose. To enhance the enzymatic conversion of WS, we tested the impact of three different pretreatments, e.g. sulfuric acid (H2SO4), sodium hydroxide (NaOH), and hot water pretreatments to the enzymatic digestions. Among the three pretreatments, the highest cellulose conversion rate was obtained with the 4% NaOH pretreatment at 121 °C (87.2%). In addition, NaOH pretreatment was mainly effective in removing lignin, whereas the H2SO4 pretreatment efficiently removed hemicellulose. To investigate results of pretreated process for enhancement of enzyme-hydolysis to the WS, we used scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy to analyze structural changes of raw and treated materials. The structural analysis indicated that after H2SO4 and NaOH pretreatments, most of the amorphous cellulose and partial crystalline cellulose were hydrolyzed during enzymatic hydrolysis. The findings of the present study indicate that WS could be ideal materials for production of monomeric sugars with proper pretreatments and effective enzymatic base hydrolysis.

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Section: Resultsmentioning

confidence: 99%

“…FTIR analysis was performed to reveal the changes in the functional groups in raw, 121 °C pretreated and enzyme-hydrolyzed WS 47 . The FTIR spectra of different samples were obtained with a FTIR spectrometer (Nicolet 8700, Bruker AXS, Karlsruhe, Germany).…”

Section: Methodsmentioning

confidence: 99%

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Zheng

Zhou

Wang

et al. 2018

Sci Rep

157

View full text Add to dashboard Cite

show abstract

“…The crystallinity index (CrI) value calculated from X‐ray diffraction reflected the sample's crystallinity and sensitivity to other components, including amorphous cellulose, hemicellulose and lignin, which together contribute to the amorphous portion of the corn stover . Table displays the CrI data, calculated from the corresponding XRD patterns for sterilized and white rot fungus‐treated corn stover at different stages.…”

Section: Resultsmentioning

confidence: 99%

Effect of Irpex lacteus, Pleurotus ostreatus and Pleurotus cystidiosus pretreatment of corn stover on its improvement of the in vitro rumen fermentation

et al. 2018

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“…The reason of AAP may be the combination of solvent and the acidity of acetic acid. In the pretreatment stage, the acidity of acetic acid degraded the hemicellulose in the fiber, which increased the fiber pores and accelerated the lignin dissolution [46][47][48]. While the fiber surface of CAP, MAP and OAP showed less lignin droplets than AAP, the disruption on the fiber surface could be clearly observed.…”

Section: Sem Analysismentioning

confidence: 99%

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

et al. 2020

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Pretreatment is an essential process for the extensive utilization of lignocellulose materials. The effect of four common organic acid pretreatments for Kraft dissolving pulp production was comparatively investigated. It was found that under acidic conditions, hemicellulose can be effectively removed and more reducing sugars can be recovered. During acetic acid pretreatment, lignin that was dissolved in acetic acid could form a lignin-related film which would alleviate cellulose hydrolysis, while other organic acids caused severe cellulose degradation. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometry (XRD) were used to characterize the pretreated chips in the process. Lignin droplets were attached to the surface of the treated wood chips according to the SEM results. The FTIR spectrum showed that the lignin peak signal becomes stronger, and the hemicellulose peak signal becomes weaker with acid pretreatment. The XRD spectrum demonstrated that the crystallinity index of the wood chips increased. The acetic acid pretreatment process-assisted Kraft process achieved higher yield (31.66%) and higher α-cellulose (98.28%) than any other organic acid pretreatment. Furthermore, extensive utilization of biomass was evaluated with the acetic acid pretreatment-assisted Kraft process. 43.8% polysaccharide (12.14% reducing sugar and 31.66% dissolving pulp) and 22.24% lignin (0.29% acetic acid lignin and 21.95% sulfate lignin) were recovered during the process. Biomass utilization could reach 66.04%. Acetic acid pretreatment is a promising process for extensive biomass utilization.

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Integrated chemical and multi-scale structural analyses for the processes of acid pretreatment and enzymatic hydrolysis of corn stover

Cited by 66 publications

References 47 publications

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Pretreatment of wheat straw leads to structural changes and improved enzymatic hydrolysis

Effect of Irpex lacteus, Pleurotus ostreatus and Pleurotus cystidiosus pretreatment of corn stover on its improvement of the in vitro rumen fermentation

Comparative Evaluation of Organic Acid Pretreatment of Eucalyptus for Kraft Dissolving Pulp Production

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