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Immobilized laccase on magnetic nanoparticles for enhanced lignin model compounds degradation

Chinese Journal of Chemical Engineering 2020年第8期28卷 2152-2159页

作者： Xinyan Chen Bin He Mi Feng Dingwei Zhao Jian Sun Key Laboratory of Molecular Medicine and Biotherapy School of Life ScienceBeijing Institute of TechnologyBeijing 100081China Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijing 100081China

As a natural aromatic polymer,lignin has great potential but limited industrial application due to its complex chemical *** strategies for lignin conversion,biodegradation has attracted promising interest recently in term of efficiency,selectivity and mild *** order to overcome the issues of poor stability and non-reusability of enzyme in the biodegradation of lignin,this work explored a protocol of immobilized laccase on magnetic nanoparticles(MNPs)with rough surfaces for enhanced lignin model compounds *** electron microscope with energy dispersive spectrometer(SEM-EDS),flourier transformation infrared spectroscopy(FTIR)and thermal gravimetric analysis(TGA)were utilized to characterize the immobilization of *** results showed a maximum activity recovery of 64.7%towards laccase when it was incubated with MNPs and glutaraldehyde(GA)with concentrations of 6 mg·ml^-1and 7.5 mg·ml^-1for 5 h,*** immobilized laccase showed improved thermal stability and pH tolerance compared with free laccase,and remained more than 80%of its initial activity after 20 days of storage at 4℃.In addition,about 40%residual activity of the laccase remained after 8 times *** chromatography–mass spectrometry(GC–MS)was utilized to characterize the products of lignin model compound degradation and activation,and the efficiency of immobilized laccase was calculated to be 1–5 times that of free *** was proposed that the synergistic effect between MNPs and laccase displays an important role in the enhancement of stability and activity in lignin model compound biodegradation.

关键词： Laccase Immobilization Magnetic nanoparticles lignin model compounds Degradation

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Role of methoxy and C_(α)-based substituents in electrochemical oxidation mechanisms and bond cleavage selectivity of β-O-4 lignin model compounds

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Green Energy & Environment 2024年第1期9卷 114-125页

作者： Yang Zhou Qiang Zeng Hongyan He Kejia Wu Fuqiao Liu Xuehui Li School of Chemistry and Chemical Engineering The Guangdong Provincial Key Laboratory of Green Chemical Product TechnologyState Key Laboratory of Pulp and Paper EngineeringSouth China University of TechnologyGuangzhouGuangdong510640China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China

In order to better understand the specific substituent effects on the electrochemical oxidation process of β-O-4 bond, a series of methoxyphenyl type β-O-4 dimer model compounds with different localized methoxyl groups, including 2-(2-methoxyphenoxy)-1-phenylethanone, 2-(2-methoxyphenoxy)-1-phenylethanol, 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl)ethanone, 2-(2-methoxyphenoxy)-1-(4-methoxyphenyl)ethanol, 2-(2,6-dimethoxyphenoxy)-1-(4-methoxyphenyl)ethanone, 2-(2,6-dimethoxyphenoxy)-1-(4-methoxyphenyl)ethanol have been selected and their electrochemical properties have been studied experimentally by cyclic voltammetry, and FT-IR spectroelectrochemistry. Combining with electrolysis products distribution analysis and density functional theory calculations, oxidation mechanisms of all six model dimers have been explored. In particular, a total effect from substituents of both para-methoxy(on the aryl ring closing to Cα) and Cα-OH on the oxidation mechanisms has been clearly observed, showing a significant selectivity on the Cα-Cβbond cleavage induced by electrochemical oxidations.

关键词： lignin model compounds β-O-4 dimers Electrochemical oxidation Oxidation mechanisms Substituent effect

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Crystalline porous materials for catalytic conversion of lignin-related substances

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Aggregate 2024年第3期5卷 142-163页

作者： Qing Huang Pengfei Wu Xiu-Fen Li Yi-Rong Wang Dan Tian Ya-Qian Lan College of Materials Science and Engineering Nanjing Forestry UniversityNanjingJiangsuP.R.China School of Chemistry South China Normal UniversityGuangzhouP.R.China Co-Innovation Center for Sustainable Forestry in Southern China Nanjing Forestry UniversityNanjingJiangsuP.R.China

The conversion of the biomass into eco-friendly fuels and chemicals has been exten-sively recognized as the essential pathway to achieve the sustainable economy and carbon neutral ***,as a kind of promising biomass energy,has been certified to produce the high-valued chemicals and *** efforts have been made to develop various catalysts for lignin catalytic *** metal-organic frameworks(MOFs)and covalent organic frameworks(COFs)belong to very important heterogeneous porous catalysts due to their regular porous struc-tures,high specific surface area,and precisely tailored *** the review,thefirst part focused on the catalytic conversion of lignin,lignin model compounds,and lignin derivatives using the pristine MOFs,functional MOF composites,and MOF-derived *** second part summarized the catalytic conversion of lignin model compounds using pristine COFs and functional COF *** review here mainly concentrated on the design of the materials,screening of catalytic conditions,and explorations of the corresponded ***,(1)we summarized the MOF-and COF-based materials for the effects on the catalytic trans-formation of lignin-related substances;(2)we emphasized the catalytic mechanism of C–C and C–O bonds cleavage together with the structure–activity relationships;(3)we in-depth realized the relationship between the chemical/electronic/structural properties of the MOF-and COF-based catalysts and their catalytic performance for lignin-related ***,the challenges and future perspectives were also discussed on the catalytic conversion of lignin-related substances by MOF-and COF-based catalysts.

关键词： catalytic conversion covalent organic frameworks lignin lignin derivatives lignin model compounds metal-organic frameworks

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