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Title: Enhancing liquid hot water (LHW) pretreatment of sugarcane bagasseby high pressure carbon dioxide (HP-CO2).
Authors: Gurgel, Leandro Vinícius Alves
Pimenta, Maria Teresa Borges
Curvelo, Antonio Aprigio da Silva
Keywords: Hemicelluloses extraction
Sugarcane bagasse
Enzymatic hydrolysisa
Issue Date: 2014
Citation: GURGEL, L. V. A.; PIMENTA, M. T. B.; CURVELO, A. A. da S. Enhancing liquid hot water (LHW) pretreatment of sugarcane bagasseby high pressure carbon dioxide (HP-CO2). Industrial Crops and Products, v. 57, p. 141-149, 2014. Disponível em: <>. Acesso em: 02 fev. 2015.
Abstract: Liquid hot water (LHW) pretreatment associated with high pressure carbon dioxide (HP-CO2) was eval-uated as a potential green pretreatment technology for extraction of hemicelluloses from depithedsugarcane bagasse to produce fermentable sugars. Developing a technology based on the use of lowcost, non-corrosive, and recoverable chemicals as CO2can result in a more efficient and economic pro-cess. In this study, depithed sugarcane bagasse was treated with LHW and HP-CO2at milder temperaturesin comparison with LHW pretreatment alone. To assess the effects of varying pretreatment operationalconditions on extraction of xylo-oligosaccharides and xylose release with cellulose preservation a centralcomposite design (CCD) of experiments was used. The pretreatments were carried out at temperaturesranging from 93.8◦C (8.62 MPa) to 136.2◦C (12.96 MPa) and times from 17.6 to 102.4 min with a liquid-to-solid ratio of 12:1. The maximum xylan and xylose concentrations were achieved by treating depithedbagasse at 100◦C for 30 min and 115◦C for 60 min, respectively. At these conditions the amount of xylanequivalent ranged 10–12 g/L. At 115◦C for 60 min, the cellulose preservation achieved 97.2%. The obtainedresults showed that HP-CO2proved to be an efficient hydrolysis agent. Samples of LHW-HP-CO2pre-treated bagasse were tested for enzymatic digestibility. Depithed bagasse pretreated at 115◦C for 60 minafter enzymatic hydrolysis had a glucose yield of 30.43 g/L and a cellulose conversion of 41.17%.
ISSN: 0926-6690
metadata.dc.rights.license: O periódico Industrial Crops and Products concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3581981489176.
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