Comparison of the substrate enzymatic digestibility and lignin structure of wheat straw stems and leaves pretreated by green liquor

Jiang, Bo; Wang, Wang‐Xia; Gu, Feng; Cao, Tingyue; Jin, Yongcan

doi:10.1016/j.biortech.2015.08.104

Cited by 38 publications

(24 citation statements)

References 28 publications

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“…The tetraploid showed decreased lignin and ash content, changes of lignin structure, and increased cellulose content (Figure 3, Table 1). As previously published, these changes can significantly affect the enzymatic hydrolysis process [20][21][22][23][24], which is consistent with our results in the tetraploid straw.…”

Section: Optimum Enzymatic Hydrolysis Ability Of Tetraploid Strawsupporting

confidence: 94%

Profiling of Chemical and Structural Composition of Lignocellulosic Biomasses in Tetraploid Rice Straw

Chen

et al. 2020

Polymers

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The improvement of the saccharification of rice straw is one of the strategies to reduce the sophisticated pretreatment that results in high cost and is unfriendly to the environment. We explored the cell wall features in tetraploid rice and highlighted the enhanced saccharification of tetraploid with large biomass. Results showed that lignin content and S/G ratio reduced to 17.09% and 0.37, respectively, in tetraploid straw by the determination of the pyGC-MS method. After the pretreatment, the cellulose crystallinity index decreased from 63.22% to 57.65% in tetraploid straw, which is lower than that of pretreated diploid straw. Surface topological analysis of SEM images indicated that tetraploid straw was more susceptible to the pretreatment. Tetraploid straw showed a strong advantage in the process of enzymatic hydrolysis. The enzyme efficiency reached the highest value of 77.60%, and the rate of enzyme reaction was improved to make the reaction saturated earlier than conventional rice. We concluded that the high saccharification has resulted from the alteration of lignin and cellulose in tetraploid rice. Our research provides an improved green feedstock for bioenergy, and the tetraploid rice straw shows the potential utilization value in bioethanol production.

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Section: Optimum Enzymatic Hydrolysis Ability Of Tetraploid Strawsupporting

confidence: 94%

Profiling of Chemical and Structural Composition of Lignocellulosic Biomasses in Tetraploid Rice Straw

Chen

et al. 2020

Polymers

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“…For example, Herbaut et al and Yu et al showed a positive correlation between the S/G ratio and the hydrolysis yields for miscanthus and woody chips (Yu et al, 2014;Herbaut et al, 2018) because of the higher binding capacity of G (with branched structure) over S (with linear structure and low degree of polymerisation) to cellulase (Guo et al, 2014;Yoo et al, 2017b). By contrast, others found a negative correlation between S/G ratio and the enzymatic hydrolysis in woody chips (Papa et al, 2012), in pretreated miscanthus (Xu et al, 2012;, in pre-treated wheat straw (Jiang et al, 2016) and in genetically engineering poplar (Escamez et al, 2017). On the other hand, previous studies showed that changes in S/G ratio of untreated LB did not influence the enzymatic hydrolysis: for untreated poplar with S/G ratio between 1.0 and 3.0 (Studer et al, 2011), for Arabidopsis stems containing G-and S-rich lignin (Li et al, 2010) and for transgenic alfalfa (Chen and Dixon, 2007).…”

Section: Ligninmentioning

confidence: 97%

Lignocellulosic Biomass: Understanding Recalcitrance and Predicting Hydrolysis

2019

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Lignocellulosic biomass (LB) is an abundant and renewable resource from plants mainly composed of polysaccharides (cellulose and hemicelluloses) and an aromatic polymer (lignin). LB has a high potential as an alternative to fossil resources to produce second-generation biofuels and biosourced chemicals and materials without compromising global food security. One of the major limitations to LB valorisation is its recalcitrance to enzymatic hydrolysis caused by the heterogeneous multi-scale structure of plant cell walls. Factors affecting LB recalcitrance are strongly interconnected and difficult to dissociate. They can be divided into structural factors (cellulose specific surface area, cellulose crystallinity, degree of polymerization, pore size and volume) and chemical factors (composition and content in lignin, hemicelluloses, acetyl groups). Goal of this review is to propose an up-to-date survey of the relative impact of chemical and structural factors on biomass recalcitrance and of the most advanced techniques to evaluate these factors. Also, recent spectral and water-related measurements accurately predicting hydrolysis are presented. Overall, combination of relevant factors and specific measurements gathering simultaneously structural and chemical information should help to develop robust and efficient LB conversion processes into bioproducts.

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“…According to these authors, high S/G ratio benefits pretreatment mainly due to (i) lignin depolymerization: S-lignin features higher level of labile β- O -4′ linkages which are readily cleavable during pretreatment; and (ii) delignification: S-lignin with relatively higher occurrence of β-β′ bonds leads to lower molecular weight which could facilitate lignin migration and removal. However, inconsistent results have also been reported on the correlation of S/G ratio with saccharification efficiency, e.g., high S/G ratio was negatively associated with the saccharification of both NaOH and H 2 SO 4 pretreated Miscanthus (Xu et al, 2012; Li M. et al, 2014) and green liquor pretreated wheat straw (Xu et al, 2012; Li M. et al, 2014; Jiang et al, 2016). An unclear correlation has also been reported, such as green liquor and Kraft pretreated Eucalyptus (Papa et al, 2012; Santos et al, 2012), NaOH and H 2 SO 4 pretreated wheat and rice samples (Wu et al, 2013), and mild acid treated maize cell wall (Zhang et al, 2011).…”

Section: Lignin Monolignol Compositional Unitsmentioning

confidence: 99%

Current Understanding of the Correlation of Lignin Structure with Biomass Recalcitrance

2016

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Lignin, a complex aromatic polymer in terrestrial plants, contributes significantly to biomass recalcitrance to microbial and/or enzymatic deconstruction. To reduce biomass recalcitrance, substantial endeavors have been exerted on pretreatment and lignin engineering in the past few decades. Lignin removal and/or alteration of lignin structure have been shown to result in reduced biomass recalcitrance with improved cell wall digestibility. While high lignin content is usually a barrier to a cost-efficient application of bioresources to biofuels, the direct correlation of lignin structure and its concomitant properties with biomass remains unclear due to the complexity of cell wall and lignin structure. Advancement in application of biorefinery to production of biofuels, chemicals, and bio-derived materials necessitates a fundamental understanding of the relationship of lignin structure and biomass recalcitrance. In this mini-review, we focus on recent investigations on the influence of lignin chemical properties on bioprocessability—pretreatment and enzymatic hydrolysis of biomass. Specifically, lignin-enzyme interactions and the effects of lignin compositional units, hydroxycinnamates, and lignin functional groups on biomass recalcitrance have been highlighted, which will be useful not only in addressing biomass recalcitrance but also in deploying renewable lignocelluloses efficiently.

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Comparison of the substrate enzymatic digestibility and lignin structure of wheat straw stems and leaves pretreated by green liquor

Cited by 38 publications

References 28 publications

Profiling of Chemical and Structural Composition of Lignocellulosic Biomasses in Tetraploid Rice Straw

Profiling of Chemical and Structural Composition of Lignocellulosic Biomasses in Tetraploid Rice Straw

Lignocellulosic Biomass: Understanding Recalcitrance and Predicting Hydrolysis

Current Understanding of the Correlation of Lignin Structure with Biomass Recalcitrance

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