(PDF) Enzymatic Depolymerization of Chitins and Chitosans

PDF | The enzymatic depolymerization of chitin has been explored in consideration of the disadvantages of the chemical hydrolysis, namely partial deacetylation of the resulting oligomers ...

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Applications of Thermal Depolymerization

Thermal depolymerization is an industrial process of breaking down various waste materials into crude oil products. The materials are subjected to high temperatures and pressure in the presence of water, thereby initiating hydrous pyrolysis. As a result, the long chain polymers of the materials are ...

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Membrane Separation of the Base-Catalyzed Depolymerization ...

One way of valorizing the lignin waste stream from the pulp and paper industries is depolymerizing it into low-molecular-mass compounds (LMMC). However, a common problem in the depolymerization of Kraft lignin is the low yields of small aromatic molecules obtained. In the present work, the combination of the repeated depolymerization of lignin and the separation of LMMC from depolymerized ...

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Depolymerization of β-1,6-N-Acetyl-d-Glucosamine Disrupts ...

However, the biochemical reaction responsible for this activity had not been previously established. Analyses of E. coli PGA depolymerization now reveal that DspB specifically hydrolyzes the glycosidic linkages of poly-β-1,6-GlcNAc. It does not cleave the related β-1,4 linkages of some chitin derivatives or catalyze N deacetylation of PGA.

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Complete Depolymerization and Repolymerization of a Sugar ...

View Enhanced PDF Access article on Wiley Online Library (HTML view) Download PDF for offline viewing. Logged in as READCUBE_USER. ... Interestingly, instead of the original monomer, the depolymerization gave a stable cyclic product (1,6‐anhydro glucopyranose) in most cases, which was kinetically and thermodynamically favored. However, this ...

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Thermal depolymerization - Wikipedia

Thermal depolymerization (TDP) is a depolymerization process using hydrous pyrolysis for the reduction of complex organic materials (usually waste products of various sorts, often biomass and plastic) into light crude oil. It mimics the natural geological processes thought to be involved in the production of fossil fuels.

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(PDF) Depolymerization and Activation of Lignin: Current ...

PDF | On Mar 21, 2018, Łukasz Klapiszewski and others published Depolymerization and Activation of Lignin: Current State of Knowledge and Perspectives. ... Download full-text PDF.

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Catalytic Depolymerization of Native and Technical Lignin ...

However, the efficient utilization of biomass has been significantly hindered by its recalcitrant nature. Herein, we have investigated the use of Ni/C for the catalytic depolymerization of native lignin in Miscanthus, a grassy biomass. Under optimized conditions, over 69% yield of select aromatic products were obtained from lignin.

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Phenolics production through catalytic depolymerization of ...

Phenolics Production through Catalytic Depolymerization of Alkali Lignin with Metal Chlorides. Xinghua Zhang, Qi Zhang, Jinxing Long, Ying Xu, Tiejun Wang,* Longlong Ma,* and Yuping Li. Lignin is an important renewable source of phenolic products. In this study, alkali lignin was depolymerized to produce phenolic compounds.

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Polymers | Free Full-Text - mdpi.com

1 · In an application study, enzymatic depolymerization of ramie was performed for fiber degumming, and the result showed that the PN32 had a 28% higher depolymerization compared to the commercial pectinase. Overall, based on the results, PN32 has high potential for industrial applications. ... View Full-Text Download PDF. Browse Figures. Abstract ...

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Depolymerisation - an overview | ScienceDirect Topics

Feb 06, 2011· Download as PDF. Set alert. About this page. ... 2019. 5.3 Depolymerization Kinetics of Polyethylene Terephthalate. Depolymerization of PET can be thought as a transition process from long polyester chain in solid state to solid oligomers, from solid oligomers to liquid oligomers, and then from liquid oligomers to monomers. ...

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(PDF) Kinetics and Thermodynamics of Ultrasound-Assisted ...

The ultrasound-assisted depolymerization of κ-carrageenan has been studied at various temperatures and times. The κ-carrageenan with initial molecular weight of 545 kDa was dispersed in water to form a 5 g/L solution, which was then depolymerized in ... Download with Google Download with Facebook or download with email. ... Download pdf ...

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Google Patents - patents.google.com

The depolymerization takes place at a pressure of between 0.2 and 2.0 MPa, so that high conversions are achieved and the depolymerization reaction proceeds faster, even in the presence of a high content of cyclic oligomers. ... Download PDF Info Publication number US6087494A.

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(PDF) Glycolytic depolymerization of PET waste in a ...

Chemical recycling, defined as the process and EG. Hydrolytic depolymerization of PET in leading to total depolymerization of PET to its closed system under microwave irradiation and monomers, or partial depolymerization to oligomers 2 MPa pressure (220 C) for 90–120 min led …

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Cytochalasin D inhibits actin polymerization and induces ...

Recently, Morris and Tannenbaum reported that there was no net depolymerization of actin in spreading fibroblasts treated with cytochalasin D, despite the well known morpho-logical effects of the ...

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Review Article Recent Development in Chemical ...

Recent Development in Chemical Depolymerization of Lignin: A Review HaiWang, 1 MelvinTucker, 2 andYunJi 1 Department of Chemical Engineering, University of North Dakota, Grand Forks, ND, USA National Renewable Energy Laboratory, Golden, CO, USA Correspondence should be addressed to Yun Ji; [email protected]

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Convergent reductive depolymerization of wood lignin to ...

Convergent reductive depolymerization of wood lignin to isolated phenol derivatives by metal-free catalytic hydrosilylation† Elias Feghali, Ge´raldine Carrot, Pierre Thue´ry, Caroline Genre and Thibault Cantat* The first examples of reductive depolymerization of lignin are reported under metal-free conditions. Using hydrosilanes as ...

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Microbial System for Polysaccharide Depolymerization ...

An enzymatic route for the depolymerization of a heteropolysaccharide (xanthan) in Bacillus sp. strain GL1, which was closely related to Brevibacillus thermoruber, was determined by analyzing the structures of xanthan depolymerization products. The bacterium produces extracellular xanthan lyase catalyzing the cleavage of the glycosidic bond between pyruvylated mannosyl and glucuronyl residues ...

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Depolymerization - an overview | ScienceDirect Topics

Download as PDF. Set alert. About this page. ... Depolymerization of lignins all the way down to phenilics can be carried out in a variety of ways: catalytic oxidation or hydrogenation and pyrolysis. 68 Little has been done to exploit these processes in the direction of monomers, ...

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Catalytic hydrothermal depolymerization of nylon 6 ...

Nov 25, 2010· Depolymerization of nylon 6 to produce ε-caprolactam using an environmentally friendly heteropoly acid catalyst was studied at temperatures between 553 and 603 K in water. The products of depolymerization were analyzed qualitatively and quantitatively by means of mass spectrometry and high-performance liquid chromatography.

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Selective chemical oxidation and depolymerization of ...

maximal xylan depolymerization or displacement. Xylan consists of a long chain of β‐1,4‐linked xylose units substituted with arabinose (typically α‐1,3‐linked in grasses) and glucuronic acid (α‐1,2‐linked). Xylan has been proposed to have a structural function in plants and therefore may play a role in determining biomass ...

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Membrane reactor for enzymatic depolymerization – a case ...

Abstract. The efficiency of enzymatic depolymerization in a membrane reactor was investigated. The model analysis was performed on bovine serum albumin hydrolysis reaction led by three different enzymes, for which kinetic equations have different forms.

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Catalytic depolymerization of alkali lignin in sub- and ...

Full Article. Catalytic Depolymerization of Alkali Lignin in Sub- and Super-critical Ethanol. Daliang Guo, a,b,c,d Bei Liu, e,f Yanjun Tang, a Junhua Zhang, a XinXing Xia, a,g, * and Shuhua Tong g, * The effects of reaction parameters on catalytic depolymerization of alkali lignin in sub- and super-critical ethanol were investigated using a high pressure autoclave, and the liquid oil and solid ...

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Bloom

Download pdf Questell-Santiago et al., Nature Chemistry, 10, 12, 1222-1228, 2018 Carbohydrate stabilization extends the kinetic limits of chemical polysaccharide depolymerization. Download pdf Amiri et al., Nature Protocols, 14, 921-954, 2019 Fractionation of lignocellulosic biomass to produce uncondensed aldehyde-stabilized lignin. Download pdf

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Membranes | Free Full-Text - mdpi.com

One way of valorizing the lignin waste stream from the pulp and paper industries is depolymerizing it into low-molecular-mass compounds (LMMC). However, a common problem in the depolymerization of Kraft lignin is the low yields of small aromatic molecules obtained. In the present work, the combination of the repeated depolymerization of lignin and the separation of LMMC from depolymerized ...

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Depolymerization and Activation of Lignin: Current State ...

PDF | On Mar 21, 2018, Łukasz Klapiszewski and others published Depolymerization and Activation of Lignin: Current State of Knowledge and Perspectives. ... Download full-text PDF.

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Thermal depolymerization of plastics - PDU testing. Task ...

The process development unit (PDU) test program is part of an ongoing effort at the Energy & Environmental Research Center (EERC) to expand the base of knowledge for the thermal depolymerization of plastics process. This phase of the development effort, initiated after successful completion of a bench-scale program, has concentrated on maximizing liquid yield.

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Bright Side of Lignin Depolymerization: Toward New ...

Lignin, a major component of lignocellulose, is the largest source of aromatic building blocks on the planet and harbors great potential to serve as starting material for the production of biobased products. Despite the initial challenges associated with the robust and irregular structure of lignin, the valorization of this intriguing aromatic biopolymer has come a long way: recently, many ...

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US5233037A - Production of caprolactam by thermal ...

The invention relates to a process for the production of caprolactam by thermal depolymerization of polyamide in the presence of small quantities of potassium carbonate at 250° to 320° C. and to a process for purifying the resulting caprolactam. ... Download PDF Info

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depolymerization (D01600) - goldbook.iupac.org

Note: Unzipping is depolymerization occurring by a @[email protected] of reactions, progressing along a @[email protected] and yielding products, usually @[email protected] at each @[email protected], from which macromolecules similar to the original can be regenerated.

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