Infrared study of arabinoxylans

Kačuráková, Marta; Ebringerová, Anna; Hirsch, Ján; Hromàdková, Zdenka

doi:10.1002/jsfa.2740660323

Cited by 216 publications

(108 citation statements)

References 17 publications

(6 reference statements)

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“…Pioneering IR studies of polysaccharides were published in the 1950-1970s (e.g., Liang and Marchessault 1959aMarchessault 1962;Nieduszynski and Marchessault 1972) and for Raman in 1987 (Wiley and Atalla 1987). The plant polysaccharides group of the Slovak Academy of Sciences (Kačuráková et al 1994(Kačuráková et al , 1999(Kačuráková et al , 2000 contributed with investigations on the different hemicelluloses, whereas Faix (1991) carried out fundamental work on IR spectroscopy of lignins of different origin. Investigations on reference substances helped a lot in the understanding of Raman spectra of lignin and their resonant enhancement at different laser wavelengths (Larsen and Barsberg 2010;Saariaho et al 2003;Takayama et al 1997).…”

Section: Principles Of Infrared Raman and Uv Microspectroscopy With mentioning

confidence: 99%

Microspectroscopy as applied to the study of wood molecular structure

Fackler

Thygesen

2012

Wood Sci Technol

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Microspectroscopy gives access to spatially resolved information on the molecular structure and chemical composition of a material. For a highly heterogeneous and anisotropic material like wood, such information is essential when assessing structure/property relationships such as moisture-induced dimensional changes, decay resistance or mechanical properties. It is, however, important to choose the right technique for the purpose at hand and to apply it in a suitable way if any new insights are to be gained. This review presents and compares three different microspectroscopic techniques: infrared, Raman and ultraviolet. Issues such as sample preparation, spatial resolution, data acquisition and extraction of knowledge from the spectral data are discussed. Additionally, an overview of applications in wood science is given for each method. Lastly, current trends and challenges within microspectroscopy of wood are discussed.

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Section: Principles Of Infrared Raman and Uv Microspectroscopy With mentioning

confidence: 99%

Microspectroscopy as applied to the study of wood molecular structure

Fackler

Thygesen

2012

Wood Sci Technol

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“…As shown in Figure 2, broad absorption band at 3400 and 2400 cm -1 is due to the stretching vibrations of OH and CH respectively and absorption band at 1200 cm -1 refer to the stretching vibrations of C-O. The C-H bending vibration shows absoption bands at 1467 and 1427 cm -1 while the OH bending vibration shows absoption bands at 1340 cm -1 [14]. Figure 2.…”

Section: Monosaccharide Analysis By Hplcmentioning

confidence: 93%

Fractionation of Hemicellulose From Rice Straw by Alkaline Extraction and Ethanol Precipitation

Zulyadi

Saleh

Sarijo

2016

MJAS

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Hemicelluloses were extracted from rice straw using alkaline extraction and ethanol precipitation. The effects of different extraction conditions; temperature (45 -65 °C), pH (4.5 -6.5), and concentrations of NaOH (0.25 -1 M) on the hemicellulose yield were investigated. Two hemicelllulosic fractions namely Ha 1 and Ha 2 were obtained by precipitation of alkaline soluble hemicellulose in 0.2 volumes and 4 volumes ethanol, respectively. The Ha 1 and Ha 2 were further characterized to obtain total sugar, monosaccharides and Klason Lignin content. The highest hemicellulose yield for Ha 1 was 4.00 % obtained at 55 °C and pH 5.5 with 0.25 M of NaOH, whereas the highest hemicellulose yield for Ha 2 was 19.88 % obtained at 55 °C and pH 5.5 with 0.5 M of NaOH. This study revealed that hemicellulose yield is dependent on the pH, temperature and concentration of NaOH in the alkaline extraction.Keywords: hemicelluloses, rice straw, alkaline extraction, ethanol precipitation Abstrak Hemiselulosa daripada hampas batang padi telah diekstrak melalui pengekstrakan beralkali dan pemendakan etanol. Kesan perbezaan kondisi pengekstrakan; suhu (45 -65 °C), pH (4.5 -6.5), dan kepekatan NaOH (0.25 -1 M) ke atas hasil hemiselulosa dikaji. Dua pecahan hemiselulosa, Ha 1 and Ha 2 telah diperolehi melalui pemendakan hemisellulosa larut alkali dalam isipadu etanol 0.2 dan 4 masing-masing. Ha 1 and Ha 2 dicirikan oleh jumlah gula, kandungan monosakarida dan Klason Lignin. Hasil hemiselulosa tertinggi untuk Ha 1 adalah 4.00 % yang diperolehi pada suhu 55 °C, pH 5.5 and 0.25 M NaOH, manakala untuk Ha 2 adalah 19.88 % diperolehi pada suhu 55 °C, pH 5.5 and kepekatan 0.5 M NaOH. Kajian ini membuktikan hasil hemisellulosa bergantung kepada pH, suhu dan kepekatan NaOH dalam pengekstrakan beralkali. Kata kunci: hemiselulosa, hampas batang padi, pengekstrakan beralkali, pemendakan etanol IntroductionThe main cereal crop in the whole wide world is rice, which is being produced in more than 148 million hectares with huge range of ecosystem. The scientific name of paddy is Oryza sativa. It is an important cereal crop that produce a lot of residues which is rice straw [1]. Rice straw is the rice plant stalk that is left as waste product on the field after harvesting of the rice grain [2]. A lot of rice straw are disposed by biomass burning that leads to air pollution.Therefore, a lot of research work has been performed to find ways of utilizing these agricultural waste. Hemicellulose is the second most abundant polysaccharide in nature, representing approximately 20-30% of

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“…The prominent absorption at 1045 cm -1 is originated from C-O, C-C stretching, and C-OH bending typical of xylans. This band showed variation of spectral shape depending on the branching at O-2 and O-3 positions (Kačuráková et al 1994). The presence of arabinosyl side chains is indicated by the signal at 1157 cm -1 .…”

Section: Ft-ir Spectramentioning

confidence: 94%

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Peng¹,

Bian²,

Li³

et al. 2013

BioResources

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Dewaxed Olea europaea L. was subjected to delignification followed by alkali extraction with 10% KOH containing 1% H 3 BO 3 . The released hemicelluloses were fractionated by precipitation through acidification and ethanol solutions with increasing concentrations from 20 to 30, 40, 50, 60, 70, and 90%. The structure of the subfractions obtained was comparatively characterized by sugar analysis, molecular weight, FT-IR, and NMR spectroscopy. Results indicated that 23.5% of hemicelluloses (% of the dewaxed material) were isolated by the alkaline extraction. An increase of ethanol concentration resulted in the precipitation of the more branched hemicelluloses as indicated by the increase of the ratios of arabinose to xylose and uronic acids to xylose. The hemicellulose subfractions Ha (precipitated by acidification to pH 5.5) and H30 (precipitated by 30% ethanol solution) had a similar structure, which was assumed to be glucuroxylan together with a small amount of α-glucan, whereas the hemicellulose subfraction H70 (precipitated by 70% ethanol solution) had a more complicated structure, which was mainly composed of a (1→4)-linked β-D-xylopyranosyl backbone with various side chains. The comprehensive structural characterization of the hemicelluloses of this species provides fundamental information for their potential applications in the fields of materials, chemicals, and energy production.

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Infrared study of arabinoxylans

Cited by 216 publications

References 17 publications

Microspectroscopy as applied to the study of wood molecular structure

Microspectroscopy as applied to the study of wood molecular structure

Fractionation of Hemicellulose From Rice Straw by Alkaline Extraction and Ethanol Precipitation

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

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