Solution properties of D-xylans from corn cobs

Garcia, Rosangela B.; Ganter, J.L.M.S; Carvalho, Rosiane R.

doi:10.1016/s0014-3057(99)00133-0

Cited by 24 publications

(9 citation statements)

References 17 publications

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“…A quantidade de xilana no sabugo de milho pode ser considerada a maior dentre todos os subprodutos agrícolas podendo chegar a até 40% [11] . Do ponto de vista estrutural, a xilana de plantas superiores possui como cadeia principal unidades de xilopiranoses unidas por ligações β-(1→4) [12,13] . A maioria das xilanas tem outros açúcares nas cadeias laterais, tais como ácido…”

Section: Introductionunclassified

“…A quantidade destes açúcares e o tipo de ligação glicosídica, entre eles, e a cadeia principal podem variar muito com a fonte botânica [13] . Existem vários estudos relacionados a filmes biodegradáveis com biopolímeros como a celulose, quitosana e o glúten, mas a literatura relacionada a filmes constituídos de xilana associada a outro polímero ainda é limitada [14] .…”

Section: Introductionunclassified

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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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Section: Introductionunclassified

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

et al. 2017

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“…Reports have been published concerning elucidation of the structural details of d -xylans from corn cobs [ 13 , 14 ]. Nevertheless, few papers are dedicated to systematically studying the biological properties of these polymers [ 11 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

In Vitro Antioxidant, Anticoagulant and Antimicrobial Activity and in Inhibition of Cancer Cell Proliferation by Xylan Extracted from Corn Cobs

Melo-Silveira

Fidelis

Costa

et al. 2011

IJMS

101

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Xylan is one of most abundant polymer after cellulose. However, its potential has yet to be completely recognized. Corn cobs contain a considerable reservoir of xylan. The aim of this work was to study some of the biological activities of xylan obtained from corn cobs after alkaline extraction enhanced by ultrasonication. Physical chemistry and infrared analyses showed 130 kDa heteroxylan containing mainly xylose:arabinose: galactose:glucose (5.0:1.5:2.0:1.2). Xylan obtained exhibited total antioxidant activity corresponding to 48.5 mg of ascorbic acid equivalent/g of xylan. Furthermore, xylan displayed high ferric chelating activity (70%) at 2 mg/mL. Xylan also showed anticoagulant activity in aPTT test. In antimicrobial assay, the polysaccharide significantly inhibited bacterial growth of Klebsiella pneumoniae. In a test with normal and tumor human cells, after 72 h, only HeLa tumor cell proliferation was inhibited (p < 0.05) in a dose-dependent manner by xylan, reaching saturation at around 2 mg/mL, whereas 3T3 normal cell proliferation was not affected. The results suggest that it has potential clinical applications as antioxidant, anticoagulant, antimicrobial and antiproliferative compounds.

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“…It is then kept in shaker for 1 hour at 37°C for complete mixing of alkali with the sample. The alkali treated extract was neutralized with acetic acid until the pH becomes 5 (Garcia et al,2000).…”

Section: Alkali Treatmentmentioning

confidence: 99%

Bioengineering of Xylan Production

2019

IJRTE

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Xylan has a wide application in different types of fields specifically in coating of pipelines and drug delivery systems. Xylan was extracted from cheap agricultural wastes such as sugarcane bagasse, corncobs, ricehulls, wheat husks by alkaline method. The presence of xylan was confirmed by identifying the functional groups by Fourier Transform Infrared Spectroscopy. The concentration of glucose was analyzed quantitatively by phenol sulphuric acid assay. It was found tha tminimum concentration of glucose was observed as present in the commercial xylan. The extracted xylan was characterized using Scanning Electron Microscopy to determine the morphology. The aim of the study is to compare the efficiency of extraction among various agro- wastes. This study reveals that maximum production of xylan was obtained in sugarcane bagasse when compared with corncobs, rice hulls and wheat husks. The maximum xylan recovery of 67.5% was found from sugarcane bagasse

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Solution properties of D-xylans from corn cobs

Cited by 24 publications

References 17 publications

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

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

In Vitro Antioxidant, Anticoagulant and Antimicrobial Activity and in Inhibition of Cancer Cell Proliferation by Xylan Extracted from Corn Cobs

Bioengineering of Xylan Production

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