Py-GC/MS for characterization of non-hydrolyzed residues from bioethanol production from softwood

Dizhbite, Tatiana; Телышева, Галина; Dobele, Gaļina; Arshanitsa, Alexandr; Bikovens, Oskars; Andersone, Anna; Kampars, Valdis

doi:10.1016/j.jaap.2010.11.004

Cited by 37 publications

(11 citation statements)

References 19 publications

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“…So the composition of lignin component obviously changed by the steam explosion. Similar structural changes of the lignin component have been observed in the non-hydrolyzed softwood residues from bioethanol production by Dizhbite et al [55]. Table 3.…”

Section: Pyrolysis Resultssupporting

confidence: 77%

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Sebestyén

Jakab

May

et al. 2013

Journal of Analytical and Applied Pyrolysis

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The aim of this study was to evaluate the chemical changes in the main components (cellulose, hemicellulose and lignin) of various lignocellulosic biomass samples during the steam explosion pretreatment. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry/mass spectrometry (TG/MS) measurements have been performed on different native, washed and steam exploded woody (willow and spruce) and herbaceous (hemp, wheat straw and sweet sorghum bagasse) biomass samples. The main differences between the thermal decomposition of the samples are interpreted in terms of the altered structure of the biomass samples by the effective steam explosion treatment and the different alkali ion contents which have been determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES) method. In order to separate these two effects, the native biomass samples have been washed with hot water to remove the main parts of the potassium and sodium ions. The concentration of K + and Na + has been reduced in the treated biomass samples so the thermal decomposition mechanism has been altered due to the elimination of the catalytic effects. Principal Component Analysis (PCA) has been used to find statistical correlations between the data. The functional group compositions of the lignin molecules have been modified significantly as indicated by the pyrograms and the score plot of the PCA. The amount of hemicellulose has been reduced. On the other hand, the relative amount of the structurally modified cellulose has been increased in the samples by the steam explosion pretreatment step.

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Section: Pyrolysis Resultssupporting

confidence: 77%

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Sebestyén

Jakab

May

et al. 2013

Journal of Analytical and Applied Pyrolysis

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“…This type of degradation products amounted only to 6% in the case of eucalyptus. Similar results were reported by Dizhbite et al (2011). These results reflect the differences in the type of hemicelluloses impurities present in the lignin samples of different origin.…”

Section: Resultssupporting

confidence: 90%

COST Action FP1105: effect of raw materials and pulping conditions on the characteristics of dissolved kraft lignins

et al. 2016

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Abstract:The composition, molecular weight (MW), and chemical structure of technical lignins as byproducts of pulping influence their application in terms of physical and chemical properties, reactivity, and performance. It is important to know how the analytical data of technical lignins are influenced by the wood species and the parameters of pulping. The present study focuses on kraft pulping and how the wood species (eucalyptus, pine, and spruce) and variable cooking times influence the characteristics of dissolved lignins. The black liquor (BL) was recovered after three different cooking times and the precipitated lignin was characterized by total acid hydrolysis including the determination of the acid insoluble part (Klason lignin, KL) and the sugars in the hydrolysate, elemental analysis, 31 P NMR spectroscopy, analytical pyrolysis (Py-GC/MS), gel permeation chromatography (GPC), thermogravimetry (TG), and differential scanning calorimetry (DSC). The results indicate that the phenolic OH content, MW and glass transition temperature increased with longer cooking times for the softwood (SW) lignins. These lignins had also a higher MW (M w 5500-8000 g mol -1 ), than the eucalyptus lignin (M w 2200-2400 g mol -1 ). Eucalyptus lignin had higher sulfur content compared to SW.

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“…The size of the polyconjugation systems was calculated from the electron paramagnetic resonance (EPR) spectra as the number of CH fragments included in the region of unpaired electron delocalization, as described by Dizhbite et al (2011) . EPR-spectra were recorded at room temperature (RT) with a Bruker EMX spectrometer (Bruker, Rheinstetten, Germany) operating at 9.6 GHz and a 50-kHz magnetic fi eld modulation.…”

Section: Methodsmentioning

confidence: 99%

Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight

et al. 2015

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The antioxidant activities (AoAs) of 50 different technical lignins have been determined. The lignins of various botanical origins (annual plants, coniferous trees, and deciduous trees) were isolated and fractionated by different techniques (delignification by alkali, kraft process, fast pyrolysis, and hydrolysis). The structure and the functionality of lignins were characterized by functional group analyses (phenolic OH, carboxyl, and methoxyl groups), analytical pyrolysis pyrolysis/gas chromatography/mass spectrometry/flame ionization detector (Py-GC/ MS/FID), electron paramagnetic resonance, size exclusion chromatography, and titrimetric methods, and the AoAs were evaluated as the capacity to scavenge the DPPH • and ABTS • + free radicals. The relationship between the lignin structure and the AoA was characterized by pair correlation, partial correlation, and multivariate regression analyses, including correlated components regression. The results were compared with those of lignin model compounds and low molecular weight phenylpropanoids. It has been shown that molecular weight does not influence essentially the AoA of lignins. There is a relationship between the activities of low and high molecular weight polyphenols; their mechanisms of action are also similar. The structure-related AoA of lignins has been quantified for the first time.

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Py-GC/MS for characterization of non-hydrolyzed residues from bioethanol production from softwood

Cited by 37 publications

References 19 publications

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

COST Action FP1105: effect of raw materials and pulping conditions on the characteristics of dissolved kraft lignins

Antioxidant activity of various lignins and lignin-related phenylpropanoid units with high and low molecular weight

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