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KMID : 0545120140240091245
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Journal of Microbiology and Biotechnology
2014 Volume.24 No. 9 p.1245 ~ p.1253
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Sulfuric Acid Hydrolysis and Detoxification of Red Alga Pterocladiella capillacea for Bioethanol Fermentation with Thermotolerant Yeast Kluyveromyces marxianus
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Chien-Hui Wu
Wei-Chen Chien
Han-Kai Chou
Yang Jung-Woo
Lin Hong-Ting-Victor
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Abstract
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One-step sulfuric acid saccharification of the red alga Pterocladiella capillacea was optimized, and various detoxification methods (neutralization, overliming, and electrodialysis) of the acid hydrolysate were evaluated for fermentation with the thermotolerant yeast Kluyveromyces marxianus. A proximate composition analysis indicated that P. capillacea was rich in carbohydrates. A significant galactose recovery of 81.1 ± 5% was also achieved under the conditions of a 12% (w/v) biomass load, 5% (v/v) sulfuric acid, 121°C, and hydrolysis for 30 min. Among the various detoxification methods, electrodialysis was identified as the most suitable for fermentable sugar recovery and organic acid removal (100% reduction of formic and levulinic acids), even though it failed to reduce the amount of the inhibitor 5-HMF. As a result, K. marxianus fermentation with the electrodialyzed acid hydrolysate of P. capillacea resulted in the best ethanol levels and fermentation efficiency.
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KEYWORD
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Kluyveromyces marxianus, Acid saccharification, Electrodialysis, Bioethanol, Fermentation, Pterocladiella capillacea
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