Aqueous two-phase extraction using thermoseparating copolymer: a new system for phenolic compounds removal from hemicelullosic hydrolysate
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/10/2012
18/10/2012
2008
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Resumo |
BACKGROUND: The hydrolysis of hemicellulosic material can provide liquor with high xylose concentration (which can be used as a fermentation medium) and phenolic compounds (Phs), potentially immunostimulating compounds. However, these hydrolysates must be detoxified in order to remove the Phs that can act as inhibitors in bioconversions. RESULTS: Aqueous two-phase systems composed of thermoseparating copolymers were used for rice straw hydrolysate detoxification. The hydrolysis process was able to promote chemical breakdown of 85% of the total hemicellulose content, 14% of the cellulose, and 2% of the lignin. The hydrolysate obtained contained 19.7 g L-1 of xylose and several phenolic compounds, such as vanillin, vanillic acid, ferullic acid, etc. The phenolics extraction was studied as a function of copolymer molar mass (1100 g mol(-1), 2000 g mol(-1) and 2800 g mol(-1)), their percentages (from 5% to 50%) and Phs initial concentration. Phenolic compounds extraction of around 80% was obtained under the following conditions: 20% (w/w) and 35% (w/w) copolymer 1100 g mol-1, 35% (w/w) copolymer 2000 g mol(-1) and 35% (w/w) copolymer 2800 g mol(-1) at 25 degrees C. CONCLUSIONS: The results demonstrated the viability of this method for the removal of Phs from rice straw hydrolysate, which has potential uses in bioconversion processes. (c) 2007 Society of Chemical Industry. |
Identificador |
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, v.83, n.2, p.167-173, 2008 0268-2575 http://producao.usp.br/handle/BDPI/17643 10.1002/jctb.1779 |
Idioma(s) |
eng |
Publicador |
JOHN WILEY & SONS LTD |
Relação |
Journal of Chemical Technology and Biotechnology |
Direitos |
restrictedAccess Copyright JOHN WILEY & SONS LTD |
Palavras-Chave | #aqueous two-phase systems #recovery #thermoseparating #triblock copolymer #residues #phenolics compounds #XYLITOL PRODUCTION #PURIFICATION #FERMENTATION #TEMPERATURE #ACID #DETOXIFICATION #PROTEIN #XYLOSE #Biotechnology & Applied Microbiology #Chemistry, Multidisciplinary #Engineering, Chemical |
Tipo |
article original article publishedVersion |