High-solid ethylenediamine pretreatment to fractionate new lignin streams from lignocellulosic biomass

Xu, Li; Zhang, Jiayin; Zong, Qiu-Jin; Wang, Li; Xu, Tao; Gong, Junbo; Liu, Zhihua; Li, Bingzhi; Yuan, Ying‐Jin

doi:10.1016/j.cej.2021.130962

Cited by 52 publications

(36 citation statements)

References 69 publications

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“…Nevertheless, new multifunctional catalytic system will be designed to couple all elementary reactions, and particular attention will be paid to the depolymerization of lignin to ketone intermediates and the amination of aromatic ketones. Furthermore, amination of lignin [18] prior to depolymerization might be another approach to obtain benzylamines. Nevertheless, the above case offers a potential protocol for the conversion of native lignin to bio-based benzylamines.…”

Section: Methodsmentioning

confidence: 99%

Sustainable Production of Benzylamines from Lignin

et al. 2021

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Catalytic conversion of lignin into heteroatom functionalized chemicals is of great importance to bring the biorefinery concept into reality. Herein, a new strategy was designed for direct transformation of lignin β‐O‐4 model compounds into benzylamines and phenols in moderate to excellent yields in the presence of organic amines. The transformation involves dehydrogenation of Cα−OH, hydrogenolysis of the Cβ−O bond and reductive amination in the presence of Pd/C catalyst. Experimental data suggest that the dehydrogenation reaction proceeds over the other two reactions and secondary amines serve as both reducing agents and amine sources in the transformation. Moreover, the concept of “lignin to benzylamines” was demonstrated by a two‐step process. This work represents a first example of synthesis of benzylamines from lignin, thus providing a new opportunity for the sustainable synthesis of benzylamines from renewable biomass, and expanding the products pool of biomass conversion to meet future biorefinery demands.

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Section: Methodsmentioning

confidence: 99%

Sustainable Production of Benzylamines from Lignin

et al. 2021

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“…The linkages and hydroxyl groups of the fractionated lignin from corn stover biomass were analyzed using 2D NMR and 31 P NMR ( Liu et al, 2019a ; Meng et al, 2019 ; Xu et al, 2022 ). The lignin molecular weight distribution before and after fermentation was analyzed by gel permeation chromatography (GPC).…”

Section: Methodsmentioning

confidence: 99%

“…The analysis was carried out on a Waters e2695 system equipped with a variable 2489 UV/Vis detector at 280 and 254 nm and two tandem 30 cm × 7.8 mm TSKgel GMPWxl column (TOSOH, Tokyo). As alkaline solution can dissolve the lignin, 0.1 M NaOH was employed as a mobile phase with a flow rate of 1.0 ml/min ( Liu et al, 2017 ; Xu et al, 2022 ).…”

Section: Methodsmentioning

confidence: 99%

Microbial Valorization of Lignin to Bioplastic by Genome-Reduced Pseudomonas putida

Zong

et al. 2022

Front. Microbiol.

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As the most abundant natural aromatic resource, lignin valorization will contribute to a feasible biobased economy. Recently, biological lignin valorization has been advocated since ligninolytic microbes possess proficient funneling pathways of lignin to valuable products. In the present study, the potential to convert an actual lignin stream into polyhydroxyalkanoates (PHAs) had been evaluated using ligninolytic genome-reduced Pseudomonas putida. The results showed that the genome-reduced P. putida can grow well on an actual lignin stream to successfully yield a high PHA content and titer. The designed fermentation strategy almost eliminated the substrate effects of lignin on PHA accumulation. Employing a fed-batch strategy produced the comparable PHA contents and titers of 0.35 g/g dried cells and 1.4 g/L, respectively. The molecular mechanism analysis unveiled that P. putida consumed more small and hydrophilic lignin molecules to stimulate cell growth and PHA accumulation. Overall, the genome-reduced P. putida exhibited a superior capacity of lignin bioconversion and promote PHA accumulation, providing a promising route for sustainable lignin valorization.

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“…Due to formation of negligible amounts of pseudo-lignin at low severe dilute acid pretreatment of a xylan-Avicel mixture, enzymatic conversion of cellulose dropped significantly (> 25%) compared to that of the cellulose solely pretreated under the same reaction conditions. Xu et al [50] conducted ethylenediamine-based Table 1 Events of lignin redeposition on different types of biomasses and its impact on structural configuration and enzymatic hydrolysis process…”

Section: Acid Pretreatmentmentioning

confidence: 99%

A Critical Review on the Effect of Lignin Redeposition on Biomass in Controlling the Process of Enzymatic Hydrolysis

et al. 2022

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The key factor in lignocellulosic biorefinery is to extract maximum sugars from biomass as feedstock for the process of fermentation. The major barrier in extracting the sugars is the presence of lignin of biomass that primarily restricts the accessibility of cellulose to enzymes. Therefore, it is important to locate the presence and morphology of lignin to assess the reaction severity. In most of the severe pretreatment conditions, lignin is observed to condense and form spherical droplets on the surface of treated biomass. Such formation of pseudo-lignin differs in the action of cellulose hydrolysis from that of the initial or residual lignin content of biomass. In view of that, the present review is focused on the impact of various pretreatment techniques on the morphological changes in lignin and its subsequent redeposition or redistribution effect towards enzymatic hydrolysis process. Initially, the effect of different pretreatment methods is assessed which primarily resulted into the occurrence of lignin redeposition on the surface and interior of biomass. Thereafter, an in-depth insight is provided to understand the underlying mechanism of such formations of pseudo-lignin under severe reaction conditions. Finally, the study is concluded discussing the future recommendation to circumvent the interference of pseudo-lignin on enzymatic reactions. Hence, the present review article will not only help the readers to gain the knowledge on the formations and problems of pseudo-lignin obtained from biomass but also details the latest advancements that are involved to overcome the inhibitory effect of pseudo-lignin during the enzymatic hydrolysis of biomass. Highlights• The ultrastructural morphology of pseudo-lignin in the form of droplets are discussed.• The various pretreatment processes that are responsible for the formation of pseudo-lignin are described.• An insight on the reaction mechanisms is provided for the impact of pseudo-lignin towards enzymatic hydrolysis.• Advances processes to overcome the inhibitory effect are comprehensively summarized.• Associated challenges and future recommendations are demonstrated.

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High-solid ethylenediamine pretreatment to fractionate new lignin streams from lignocellulosic biomass

Cited by 52 publications

References 69 publications

Sustainable Production of Benzylamines from Lignin

Sustainable Production of Benzylamines from Lignin

Microbial Valorization of Lignin to Bioplastic by Genome-Reduced Pseudomonas putida

A Critical Review on the Effect of Lignin Redeposition on Biomass in Controlling the Process of Enzymatic Hydrolysis

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