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Combination of water extraction with dilute-sulphuric acid pretreatment for enhancing the enzymatic hydrolysis of jatropha curcas shells
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2015 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 64, 233-241 p.Article in journal (Refereed) Published
Abstract [en]

Jatropha curcas shells were extracted with water in a pilot-scale reactor and then pretreated with dilute sulphuric acid. The pretreatment was initially investigated with a Box-Behnken experimental design in the range of 110-180 degrees C, 0.1-1.5% H2SO4 and 20-60 min, and then with complementary experiments at 190 degrees C. The glucan recovery was above 87% in all the experimental runs. Xylan solubilisation was 13-20% in the milder pretreatments and up to 45% in the most severe runs. Around 70% cellulose enzymatic conversion, evaluated with commercial cellulases during 72-h hydrolysis, was achieved for the pretreatments at 180 degrees C, and a region with maximal conversion was predicted for around 190 degrees C. For confirming that estimation, a 2(2)-experiment augmented by one central point and parallel pretreatments of pre-extracted and non-extracted shells were performed. The highest cellulose conversion, reached at the central point, was 16.5% higher for the pre-extracted and pretreated material than for the directly pretreated one. The low cellulose crystallinity index (0.79) of the pre-extracted and pretreated shells correlated well with their better enzymatic convertibility.

Place, publisher, year, edition, pages
2015. Vol. 64, 233-241 p.
Keyword [en]
Jatropha curcas shells, Dilute-acid pretreatment, Water extraction, Enzymatic hydrolysis, gnocellulosic materials
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:umu:diva-100962DOI: 10.1016/j.indcrop.2014.09.040ISI: 000348746700029OAI: oai:DiVA.org:umu-100962DiVA: diva2:796221
Available from: 2015-03-18 Created: 2015-03-16 Last updated: 2017-12-04Bibliographically approved

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Martin, Carlos

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