Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/10412
Título: | An alternative application to the portuguese agro-industrial residue : wheat straw |
Autor(es): | Ruzene, Denise S. Silva, Daniel Pereira da Vicente, A. A. Gonçalves, Adilson Roberto Teixeira, J. A. |
Palavras-chave: | Agro-industrial residue Lignocellulosic materials Wheat straw Extraction Hemicellulose Papermaking |
Data: | Mar-2008 |
Editora: | Humana Press |
Revista: | Applied Biochemistry and Biotechnology |
Citação: | "Applied Biochemistry and Biotechnology". ISSN 0273-2289. 147:1-3 (2008) 85-96. |
Resumo(s): | 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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/10412 |
DOI: | 10.1007/s12010-007-8066-2 |
ISSN: | 0273-2289 1559-0291 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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2008-080.pdf | 223,42 kB | Adobe PDF | Ver/Abrir |