Infrared spectroscopic analysis of the structure of xylans

Buslov, D. K.; Kaputski, F. N.; Sushko, N. I.; Torgashev, V. I.; Solov’eva, L. V.; Tsarenkov, V. M.; Zubets, O. V.; Larchenko, L. V.

doi:10.1007/s10812-010-9282-z

Cited by 37 publications

(22 citation statements)

References 3 publications

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“…In contrast to the high degree of spectral similarities in the wavenumber range from 3700 to 2800 cm -1 , great differences occurred in the fingerprint region (1800 to 650 Kačuráková et al 1999). COO − groups were detected in untreated xylan (Buslov et al 2009). After torrefaction at 220 °C for 5 h, asymmetric and symmetric stretching and deformation vibrations of COO − absorptions shifted and the pronounced peaks at 1589, 1400, 843, and 780 cm -1 demonstrated the formation of new carboxylic acid salts (Shevchenko 1963).…”

Section: Xylanmentioning

confidence: 78%

TGA-FTIR Analysis of Torrefaction of Lignocellulosic Components (cellulose, xylan, lignin) in Isothermal Conditions over a Wide Range of Time Durations

Lv¹,

Perré²,

Perré³

2015

BioResources

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This study investigated chemical decomposition of lignocellulosic components in the course of torrefaction under isothermal conditions for durations up to 5 hours. The goal was a better understanding of the behaviour of biomass, at both short and long residence times, which is important for innovation in the chemical and bioenergy industries. Gaseous and solid-phase decomposition products of cellulose, xylan, and two lignins, were studied following torrefaction at three temperatures (220, 250, and 280 °C) for a continuous recording of mass loss and emission of volatiles over 5 hours. Two decomposition stages were revealed for xylan, with a notable release of CO that increased with treatment temperature. 4-O-methyl glucurono-units on the side chains of xylan degraded first, and acetyl groups and macromolecule fragments accounted for the second degradation, starting at 250 °C. The primary production of acetic acid occurred at 280 °C. For the two lignins, decomposition reactions predominated at lower temperatures, while rearrangement prevailed at 280 °C. The emission of phenol was a clear distinction between the two. Cellulose was thermally stable at short times under all treatments, but it decomposed dramatically afterwards, especially at 280 °C.

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Section: Xylanmentioning

confidence: 78%

TGA-FTIR Analysis of Torrefaction of Lignocellulosic Components (cellulose, xylan, lignin) in Isothermal Conditions over a Wide Range of Time Durations

Lv¹,

Perré²,

Perré³

2015

BioResources

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“…The spectrum of neat RAX ( Figure 6) shows a strong absorption band at 1042 cm −1 , which is due to C-OH bending. 35,36 A weak absorption band at 900 cm −1 is characteristic of β-(1→4) glycosidic linkages between the xylose units in the RAX structure. A low intensity amide I absorption band appears at approximately 1651 cm −1 , which is consistent with a low level of protein contamination.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Composite Films of Arabinoxylan and Fibrous Sepiolite: Morphological, Mechanical, and Barrier Properties

Sárossy

Blomfeldt

Hedenqvist

et al. 2012

ACS Appl. Mater. Interfaces

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Hemicelluloses represent a largely unutilized resource for future bioderived films in packaging and other applications. However, improvement of film properties is needed in order to transfer this potential into reality. In this context, sepiolite, a fibrous clay, was investigated as an additive to enhance the properties of rye flour arabinoxylan. Composite films cast from arabinoxylan solutions and sepiolite suspensions in water were transparent or semitransparent at additive loadings in the 2.5−10 wt % range. Scanning electron microscopy showed that the sepiolite was well dispersed in the arabinoxylan films and sepiolite fiber aggregation was not found. FT-IR spectroscopy provided some evidence for hydrogen bonding between sepiolite and arabinoxylan. Consistent with these findings, mechanical testing showed increases in film stiffness and strength with sepiolite addition and the effect of poly(ethylene glycol) methyl ether (mPEG) plasticizer addition. Incorporation of sepiolite did not significantly influence the thermal degradation or the gas barrier properties of arabinoxylan films, which is likely a consequence of sepiolite fiber morphology. In summary, sepiolite was shown to have potential as an additive to obtain stronger hemicellulose films although other approaches, possibly in combination with the use of sepiolite, would be needed if enhanced film barrier properties are required for specific applications.

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“…In the 1500-1700 cm −1 region, bands at 1600 cm −1 and ca. 1645 cm −1 (shoulder) from ionized glucuronic acid groups and sorbed water, respectively, were also observed [33][34][35]. For CMX (Fig.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 74%

“…3400 cm −1 due to hydroxyl bond stretching [33,34]. In the 1500-1700 cm −1 region, bands at 1600 cm −1 and ca.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 99%

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

Sousa

Pedrosa

Ramos

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Xylan (the most common hemicellulose in wood and annual plants) and xylan derivatives have a very wide field of uses for which physico-chemical surface properties play an important role (e.g. in composites or barrier materials). In the present work, for the first time, inverse gas chromatography (at infinite dilution conditions) was used to assess the surface properties of xylan and xylan derivatives. Firstly, carboxymethyl xylan (CMX) and hydroxypropyl xylan (HPX) have been synthesized from commercial xylan (BX) and the presence of substituent groups confirmed by infrared spectroscopy and 1 H NMR. Then, the modified and original xylans were analysed for their dispersive component of the surface energy (γ s d ) and Lewis acid-base properties. It was found that carboxymethylation and hydroxypropylation decreased significantly the γ s d value of xylan: from 47.6 mJ m −2 in BX to 33.0 mJ m −2 and 23.5 mJ m −2 in CMX and HPX, respectively. As for the Lewis acid-base properties, HPX showed a perfectly amphoteric behaviour while the surfaces of unmodified xylan and CMX showed a prevalence of Lewis acidic character over the Lewis basic character, being, however, the surface of CMX less acidic than that of the original xylan. These results were interpreted in terms of the effect of the presence of the new substituent groups in the xylan backbone.

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Infrared spectroscopic analysis of the structure of xylans

Cited by 37 publications

References 3 publications

TGA-FTIR Analysis of Torrefaction of Lignocellulosic Components (cellulose, xylan, lignin) in Isothermal Conditions over a Wide Range of Time Durations

TGA-FTIR Analysis of Torrefaction of Lignocellulosic Components (cellulose, xylan, lignin) in Isothermal Conditions over a Wide Range of Time Durations

Composite Films of Arabinoxylan and Fibrous Sepiolite: Morphological, Mechanical, and Barrier Properties

Surface properties of xylan and xylan derivatives measured by inverse gas chromatography

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