Structural and solution properties of corn cob heteroxylans

Ebringerová, Anna; Hromàdková, Zdenka; Alföldi, Juraj; Berth, Gisela

doi:10.1016/0144-8617(92)90119-b

Cited by 124 publications

(52 citation statements)

References 18 publications

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“…A peculiarity of the water-soluble corn cob xylan (ws-AGX, Formula 5), corresponding to the hemicellulose B fractions 2) , is the presence of terminating b-D-xylopyranose residues and disaccharide side chains composed of 2-O-b-D-xylopyranosyl-a-L-arabinofuranose next to the single Araf and MeGA side chains 13,[32][33][34] . As recently published, this disaccharide, usually esterified by ferulic acid (FA) at position O-5 of the Araf unit, is a widespread component of grass cell walls 35,36) .…”

Section: Occurrence and Structural Diversitymentioning

confidence: 99%

“…The richest sources of xylans are represented by the woody tissues of dicots and non-graminaceous monocots (grasses), where heteroxylans of the GX and AGX types comprise 25 -35% of the biomass 67) , as well as seeds and cereal grains which contain 30 -50% of the AX, GAX, and HX types 13) . Several fiber crops of agricultural plants available in huge amounts have been reported as xylan sources such as bagasse 68) , wheat straw 69) , sunflower hulls 70) , (a by-product of the sunflower oil production), corn cobs 32,71) , sweet sorghum stalks 72) , and husks of guar seeds 17) and red gram 24) . Xylans have been isolated from steamed bamboo grass 73) , ramie fibers 74) , olive pulp 75) , fibers of kenaf 76) , sisal 77) and flax 47) , and jute bark 78) .…”

Section: Some Comments On Isolation Of Xylans From Natural Resourcesmentioning

confidence: 99%

See 1 more Smart Citation

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

Ebringerová¹,

Heinze

2000

Macromol. Rapid Commun.

782

373

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Section: Occurrence and Structural Diversitymentioning

confidence: 99%

Section: Some Comments On Isolation Of Xylans From Natural Resourcesmentioning

confidence: 99%

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

Ebringerová¹,

Heinze

2000

Macromol. Rapid Commun.

782

373

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“…Esse heteropolissacarídeo no sabugo de milho representa mais de 60% dos polissacarídeos da parede celular, compreendendo duas espécies estruturais β-(1→4)-D-xilopirananas que diferem nos tipos e proporção de unidades de D-glicose na cadeia lateral [9,10] . A quantidade de xilana no sabugo de milho pode ser considerada a maior dentre todos os subprodutos agrícolas podendo chegar a até 40% [11] .…”

Section: Introductionunclassified

Desenvolvimento de biofilmes à base de xilana e xilana/gelatina para produção de embalagens biodegradáveis

et al. 2017

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ResumoO objetivo deste trabalho foi desenvolver e caracterizar filmes biodegradáveis à base de xilana extraída de sabugo de milho com potencial uso como uma nova matéria-prima para embalagens biodegradáveis. Para tanto, os filmes foram produzidos através da secagem das dispersões filmogênicas com diferentes concentrações de xilana (150 mg, 300 mg, 600 mg), e glicerol (5%, 10%, 15%), com ou sem adição de gelatina (1000 mg). A caracterização avaliou a morfologia, espessura, solubilidade, biodegradabilidade e opacidade. Os filmes com melhores propriedades foram testados como biocobertura em uvas 'Itália' em duas condições de temperatura: ambiente (25 °C) e refrigerada (4 °C). Os parâmetros de perda de massa e acidez objetivaram avaliar sua eficácia. Os resultados mostraram que os filmes a base de xilana/gelatina apresentaram os melhores aspectos macroscópicos. Além disso, o aumento da concentração de xilana fez decrescer sua solubilidade. Conclui-se que a eficácia dos filmes como bioembalagem foi dependente da concentração de xilana na formulação e do período de avaliação. Palavras-chave: bioembalagens, filmes biodegradáveis, gelatina, xilana. AbstractThe aim of this work was to develop and characterize biodegradable films of xylan from corn cobs with potential use as biodegradable package. The films were produced by casting the film-forming dispersions with different amounts of xylan (150mg, 300mg, and 600mg), and glycerol (5%, 10%, and 15%), with or without gelatin (1000mg). The thickness, solubility, biodegradability, opacity, and morphology of the films were evaluated. The best films were selected to be used for covering grapes 'Italia' stored at two conditions, room temperature (25 °C) and under refrigeration (4 °C). We evaluated the water loss and acidity. The results showed that the xylan/gelatin films present the best macroscopic aspect. Furthermore, increase in the xylan concentration decreased the solubility of the films. We demonstrated that the efficiency of the films was dependent on the xylan content in the formulation and on the period of time used for evaluation.

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“…The presence of arabinosyl side chains is indicated by the signal at 1157 cm -1 . The lowintensity shoulder at 986 cm -1 also indicates the presence of arabinose attached at the xylopyransyl constituents (Ebringerova et al 1992). The bands at 1601 and 1416 cm -1 are indicative of the asymmetric and symmetric (C=O) stretching vibrations of the carboxylate group (Buslov et al 2009).…”

Section: Ft-ir Spectramentioning

confidence: 99%

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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Structural and solution properties of corn cob heteroxylans

Cited by 124 publications

References 18 publications

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

Xylan and xylan derivatives - biopolymers with valuable properties, 1. Naturally occurring xylans structures, isolation procedures and properties

Desenvolvimento de biofilmes à base de xilana e xilana/gelatina para produção de embalagens biodegradáveis

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

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