The structure of Enzymatic Lignin (EL) was elucidated and compared to conventional milled wood lignin (MWL) using wet chemical analysis, quantitative 13CNMR, GC/MS and degradative techniques. The results indicate the less degradation during EL degradation compared to MWL. Comparing to conventional ...
Chemical structure characteristics of wood/lignin composites during mold pressingTo reuse lignin polymers from bioethanol biorefinery plants, wood/ lignin composites (WLC) were modified by mold pressing, processed, and analyzed using Xray diffractometry, Fourier transform-infrared spectroscopy, thermogravimetric...
Chapter4ChemicalComponentsofWood木材的化学组成 Ⅰ.Polysaccharidefractionsofthecellwall木材细胞壁上的多糖Ⅱ.Lignin木素Ⅲ.Secondarycellwallcomponents细胞壁上的次要成份Ⅳ.Analyticaldata分析数据 1 Allpropertiesofwoodarisefromthenatureandorganizationofthechemicalcompounds.SchematicClassificationoftheChemicalComponentsofCell...
Softwood kraft lignin was hydrocracked at temperatures of 380 °C and 440 °C using a mixture of ferne oxide and sulfur as catalyst. The products obtained were characterized by gel permeation chromatography, functional group analysis, elemental analysis and I3C-NMR spectroscopy. The products were ...
Interestingly, this lignin presented large amounts of hydroxystilbene glucosides that are integrally incorporated into the lignin structure. This study indicates that lignins from tree barks can be seen as an interesting source to obtain valuable phenolic compounds. Moreover, this study is useful for ...
Chemical modification of lignin has driven numerous efforts and researches with significant studies during the last decades. After an overview with some generalities concerning the main extraction techniques along with the structure and the properties of lignins, this review describes in details the ...
To further investigate changes in the chemical structure of lignin in thecad2mutant rice, we performed 2D HSQC NMR analysis49,50on lignin-enriched cell wall samples which were prepared via enzymatic removal of cell wall polysaccharides from CWRs50,51and also on dioxane-soluble lignin samples which...
Lignin, which is present in approximately 15–40% of woody biomass, is an attractive biobased source for polymers given its aromatic nature. However, the use of lignin in polymers is complicated by its own reactivity and heterogeneous structure, factors that also create difficulties for designing ...
The residual wood meal left after extraction of milled wood lignin (MWL) was extracted with lithium chloride/N,N-dimethylacetamide, which is a well-known cellulose solvent, to afford a soluble fraction (cellulose-lignin fraction; CL) in 36.7% yield. The UV elution curve of CL acetate has the...
2. Structure Elucidation (Part A) (Atta-Ur- Rahman, ed.), p. 277. Amsterdam: Elsevier, 1988. Google Scholar Asakawa, Y.: Chemical Evolution of Mono- and Sesquiterpenoids of Liverworts. J. Hattori Bot. Lab. 64, 97 (1988). CAS Google Scholar Asakawa, Y.: Secondary Metabolites of ...