Clarification of a wheat straw-derived medium with ion-exchange resins for xylitol crystallization


Autoria(s): CANILHA, Larissa; CARVALHO, Walter; GIULIETTI, Marco; FELIPE, Maria Das Gracas Almeida; SILVA, Joao Batista Almeida E.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

18/10/2012

18/10/2012

2008

Resumo

BACKGROUND: Xylitol bioproduction from lignocellulosic residues comprises hydrolysis of the hemicellulose, detoxification of the hydrolysate, bioconversion of the xylose, and recovery of xylitol from the fermented hydrolysate. There are relatively few reports on xylitol recovery from fermented media. In the present study, ion-exchange resins were used to clarify a fermented wheat straw hemicellulosic hydrolysate, which was then vacuum-concentrated and submitted to cooling in the presence of ethanol for xylitol crystallization. RESULTS: Sequential adsorption into two anion-exchange resins (A-860S and A-500PS) promoted considerable reductions in the content of soluble by-products (up to 97.5%) and in medium coloration (99.5%). Vacuum concentration led to a dark-colored viscous solution that inhibited xylitol crystallization. This inhibition could be overcome by mixing the concentrated medium with a commercial xylitol solution. Such a strategy led to xylitol crystals with up to 95.9% purity. The crystallization yield (43.5%) was close to that observed when using commercial xylitol solution (51.4%). CONCLUSION: The experimental data demonstrate the feasibility of using ion-exchange resins followed by cooling in the presence of ethanol as a strategy to promote the fast recovery and purification of xylitol from hemicellulose-derived fermentation media. (c) 2008 Society of Chemical Industry.

Identificador

JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY, v.83, n.5, p.715-721, 2008

0268-2575

http://producao.usp.br/handle/BDPI/17500

10.1002/jctb.1861

http://dx.doi.org/10.1002/jctb.1861

Idioma(s)

eng

Publicador

JOHN WILEY & SONS LTD

Relação

Journal of Chemical Technology and Biotechnology

Direitos

restrictedAccess

Copyright JOHN WILEY & SONS LTD

Palavras-Chave #wheat straw #xylitol #hemicellulosic hydrolysate #ion-exchange resins #clarification #crystallization #HEMICELLULOSIC HYDROLYSATE #DETOXIFICATION #Biotechnology & Applied Microbiology #Chemistry, Multidisciplinary #Engineering, Chemical
Tipo

article

original article

publishedVersion