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An Alternative Application to the Portuguese Agro-Industrial Residue: Wheat Straw

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Abstract

The effects of alkaline treatments of the wheat straw with sodium hydroxide were investigated. The optimal condition for extraction of hemicelluloses was found to be with 0.50 mol/l sodium hydroxide at 55 °C for 2 h. This resulted in the release of 17.3% of hemicellulose (% dry starting material), corresponding to the dissolution of 49.3% of the original hemicellulose. The yields were determined by gravimetric analysis and expressed as a proportion of the starting material. Chemical composition and physico-chemical properties of the samples of hemicelluloses were elucidated by a combination of sugar analyses, Fourier transform infrared (FTIR), and thermal analysis. The results showed that the treatments were very effective on the extraction of hemicelluloses from wheat straw and that the extraction intensity (expressed in terms of alkali concentration) had a great influence on the yield and chemical features of the hemicelluloses. The FTIR analysis revealed typical signal pattern for the hemicellulosic fraction in the 1,200–1,000 cm−1 region. Bands between 1,166 and 1,000 cm−1 are typical of xylans.

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Acknowledgements

The authors acknowledge the financial support from FCT (Fundação para a Ciência e Tecnologia/Portugal, SFRH/BPD/26156/2005 and SFRH/BPD/26108/2005), as well as from FAPESP (Fundação de Amparo a Pesquisa do Estado de São Paulo/Brazil) and CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico).

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Authors and Affiliations

  1. Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057, Braga, Portugal

    Denise S. Ruzene, Daniel P. Silva, António A. Vicente & José A. Teixeira

  2. Biotechnology Department, Engineering School of Lorena, University of São Paulo, P.O. Box 116, 12602-810, Lorena, São Paulo, Brazil

    Adilson R. Gonçalves

Authors
  1. Denise S. Ruzene
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  2. Daniel P. Silva
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  3. António A. Vicente
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  4. Adilson R. Gonçalves
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  5. José A. Teixeira
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Correspondence to Denise S. Ruzene.

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Ruzene, D.S., Silva, D.P., Vicente, A.A. et al. An Alternative Application to the Portuguese Agro-Industrial Residue: Wheat Straw. Appl Biochem Biotechnol 147, 85–96 (2008). https://doi.org/10.1007/s12010-007-8066-2

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  • DOI: https://doi.org/10.1007/s12010-007-8066-2

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