Browsing by Autor "Christian Roslander"

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    Fermentation of the Straw Material Paja Brava by the Yeast <i>Pichia stipitis</i> in a Simultaneous Saccharification and Fermentation Process
    (Scientific Research Publishing, 2013) Cristhian Carrasco; Henrique Macedo Baudel; Christian Roslander; Mats Galbe; Gunnar Lidén
    Paja Brava is a native South American grass with a high carbohydrate content. In the current work, the potential of using this feedstock for ethanol production using a simultaneous saccharification and fermentation (SSF) process with the xylose-fermenting yeast Pichia stipitis (Scheffersomyces stipitis) CBS6054 was investigated. The straw material was subjected to SO2 catalyzed steam pretreatment at 200°C and 5 min residence time, which resulted in a solubilization of pentose sugars (mainly xylose) of 64% with only minor amounts of degradation products. The obtained material, including the pretreatment liquid, was subsequently hydrolyzed and fermented in an SSF process at microaerobic conditions using either a batch or a fed-batch process at a total water-insoluble solids loading of 10%. Overall yields of ethanol based on all available sugars of 0.24 g/g and 0.27 g/g were obtained for batch and fed-batch mode of operation, respectively. The higher yield in the fed-batch process coincided with a higher degree of conversion of the sugars in the liquid medium, in particular of arabinose, for which the conversion was doubled (from 48% to 97%).
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    SO2-catalyzed steam pretreatment and fermentation of enzymatically hydrolyzed sugarcane bagasse
    (Elsevier BV, 2009) Cristhian Carrasco; Henrique Macedo Baudel; Johan Sendelius; Tobias Modig; Christian Roslander; Mats Galbe; Bärbel Hahn‐Hägerdal; G. Zacchi; Gunnar Lidén
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    Steam pretreatment and fermentation of the straw material “Paja Brava” using simultaneous saccharification and co-fermentation
    (Elsevier BV, 2010) Cristhian Carrasco; Henrique Macedo Baudel; J. Mauricio Peñarrieta; Carlos Solano; Leslie Tejeda; Christian Roslander; Mats Galbe; Gunnar Lidén