Simultaneous pyrolysis and trimethylsilylation with N-methyl-(trimethylsilyl) trifluoroacetamide for the characterisation of lignocellulosic materials from kraft pulping

AbstractSimultaneous pyrolysis and trimethylsilylation (SPyT) withN-methyl-(trimethylsilyl)trifluoroacetamide (MSTFA) was used to characterise lignocellulosic materials from pine and eucalyptus obtained by kraft pulping. This approach protects the carboxyl groups and helps preserve the original structure of phenolic products during analytical pyrolysis, and so that pyrolysis and derivatisation occur simultaneously and the fragments of underivatised compounds are also silylatated. The SPyT products are representative for the structures present in carbohydrates and lignin of the investigated materials. The method is also suited to semi-quantitative evaluation also in terms of detection of condensed lignin structures in pulps and kraft lignins.

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QUICK NON-DESTRUCTIVE ANALYSIS OF CONDENSED LIGNIN BY FTIR. PART 2. PULP SAMPLES FROM ACID SULFITE COOKING

Cellulose Chemistry and Technology ◽

10.35812/cellulosechemtechnol.2021.55.26 ◽

2021 ◽

Vol 55 (3-4) ◽

pp. 263-270

Author(s):

JUHA FISKARI ◽

OLGA DERKACHEVA ◽

TUOMAS KULOMAA

Keyword(s):

Ftir Spectroscopy ◽

Kraft Pulping ◽

The Novel ◽

Pulp Mills ◽

Lignin Condensation ◽

Softwood Pulp ◽

Kraft Cooking ◽

Novel Method ◽

Sulfite Pulp ◽

Condensed Lignin

"In our previous work, we demonstrated how lignin condensation and precipitation taking place in kraft pulping can be detected and even quantified by Fourier Transform Infrared (FTIR) spectroscopy. Because lignin reactions in acid sulfite pulping are very different from those occurring during kraft cooking, a new analysis method is proposed to rapidly analyze the condensed lignin in acid sulfite pulp. This kind of analysis is useful for sulfite pulp mills to detect the elevated risk of black cook. This paper presents and discusses the novel method using FTIR spectroscopy to rapidly analyze lignin condensation in softwood pulp samples from acid sulfite processes. Several softwood pulp samples from acid sulfite pulping at varying levels of condensation were included in this research. According to the results, FTIR spectroscopy allows indirect quantification of lignin condensation in a difficult matrix of wood constituents, such as in incompletely delignified acid sulfite pulp."

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Chemical Characterization of Lignocellulosic Materials by Analytical Pyrolysis

Analytical Pyrolysis ◽

10.5772/intechopen.80556 ◽

2019 ◽

Cited By ~ 3

Author(s):

Ana Lourenço ◽

Jorge Gominho ◽

Helena Pereira

Keyword(s):

Chemical Characterization ◽

Lignocellulosic Materials ◽

Analytical Pyrolysis

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Cheminformatics Applied to Analytical Pyrolysis of Lignocellulosic Materials

10.5772/intechopen.100147 ◽

2021 ◽

Author(s):

Jorge Reyes-Rivera

Keyword(s):

Chemical Composition ◽

Plant Biomass ◽

Polymeric Materials ◽

Gas Chromatography Mass Spectrometry ◽

Lignocellulosic Materials ◽

Compound Identification ◽

Analytical Pyrolysis ◽

Pyrolysis Gas ◽

Pyrolysis Gas Chromatography

Pyrolysis-Gas Chromatography/Mass Spectrometry has been used to characterize a wide variety of polymers. The main objective is to infer the attributes of materials in relation to their chemical composition. Applications of this technique include the development of new improved materials in the industry. Furthermore, due to the growing interest in biorefinery, it has been used to study plant biomass (lignocellulose) as a renewable energy source. This chapter describes a procedure for characterization and classification of polymeric materials using analytical pyrolysis and cheminformatics. Application of omics tools for spectral deconvolution/alignment and compound identification/annotation on the Py-GC/MS chromatograms is also described. Statistical noise is generated by production of numerous small uninformative compounds during pyrolysis. Such noise is reduced by cheminformatics here detailed and this facilitate the interpretation of results. Furthermore, some inferences made by comparison of the identified compounds to those annotated with a biological role in specialized databases are exemplified. This cheminformatic procedure has allowed to characterize in detail, and classify congruently, different lignocellulosic samples, even using different Py-GC/MS equipment. This method can also be applied to characterize other polymers, as well as to make inferences about their structure, function, resistance and health risk based on their chemical composition.

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Influence of Calcium Ions on the Plant Cell Surface: Membrane Fusions and Conformational Changes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100050780 ◽

1974 ◽

Vol 32 ◽

pp. 154-155

Author(s):

D. James Morré ◽

Charles E. Bracker ◽

William J. VanDerWoude

Keyword(s):

Cell Wall ◽

Cell Surface ◽

Conformational Changes ◽

Calcium Ions ◽

Surface Membrane ◽

Carboxyl Groups ◽

Cross Linking ◽

Ultrastructural Evidence ◽

Glycine Max L ◽

Wall Extensibility

Calcium ions in the concentration range 5-100 mM inhibit auxin-induced cell elongation and wall extensibility of plant stems. Inhibition of wall extensibility requires that the tissue be living; growth inhibition cannot be explained on the basis of cross-linking of carboxyl groups of cell wall uronides by calcium ions. In this study, ultrastructural evidence was sought for an interaction of calcium ions with some component other than the wall at the cell surface of soybean (Glycine max (L.) Merr.) hypocotyls.

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