SciELO - Scientific Electronic Library Online

 
vol.43 issue1Production of lytic enzymes by Trichoderma isolates during in vitro antagonism with Aspergillus niger, the causal agent of collar rot of peanutProduction of inulinase from Kluyveromyces marxianus using Dahlia tuber extract author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Brazilian Journal of Microbiology

Print version ISSN 1517-8382

Abstract

HAN, Lirong et al. Alkali pretreated of wheat straw and its enzymatic hydrolysis. Braz. J. Microbiol. [online]. 2012, vol.43, n.1, pp. 53-61. ISSN 1517-8382.  http://dx.doi.org/10.1590/S1517-83822012000100006.

The efficiency of enzymatic hydrolysis of cellulose can be improved by various pretreatments of the substrate. In order to increase the efficiency of enzymatic saccharification of the wheat straw, we determined the effect of different pretreatments on the physical structure, chemical components and enzymatic saccharification of wheat straw. Our results showed that combination of grinding and sodium hydroxide (NaOH) treatment had high effect on the enzymatic hydrolysis of wheat straws. The optimal pretreatment condition was to grind the wheat straws into the sizes of 120 meshes followed by treatment with 1.0% NaOH for 1.5 h (121°C/15psi). Under this condition, the cellulose content of wheat straw was increased by 44.52%, while the content of hemicellulose and lignin was decreased by 44.15% and 42.52%, respectively. Scanning Electronic Microscopy and infrared spectrum analyses showed that significant changes occurred in the structure of wheat straws after pretreatment, which is favorable for the hydrolysis and saccharification. Cellulase produced by Penicillium waksmanii F10-2 was used to hydrolyze the pretreated wheat straw and the optimal condition was determined to be 30 h of enzymatic reaction under the temperature of 55°C, pH 5.5 and substrate concentration of 3%.

Keywords : Cellulase; Cellulose; Fermentation; Hydrolysis; Lignocellulosic; Pretreatment.

        · text in English     · pdf in English