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Optimization of a corn steep medium for production of ethanol from synthesis gas fermentation by Clostridium ragsdalei

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Abstract

Fermentation of biomass derived synthesis gas to ethanol is a sustainable approach that can provide more usable energy and environmental benefits than food-based biofuels. The effects of various medium components on ethanol production by Clostridium ragsdalei utilizing syngas components (CO:CO2) were investigated, and corn steep liquor (CSL) was used as an inexpensive nutrient source for ethanol production by C. ragsdalei. Elimination of Mg2+, NH4 + and PO4 3− decreased ethanol production from 38 to 3.7, 23 and 5.93 mM, respectively. Eliminating Na+, Ca2+, and K+ or increasing Ca2+, Mg2+, K+, NH4 + and PO4 3− concentrations had no effect on ethanol production. However, increased Na+ concentration (171 mM) inhibited growth and ethanol production. Yeast extract (0.5 g l−1) and trace metals were necessary for growth of C. ragsdalei. CSL alone did not support growth and ethanol production. Nutrients limiting in CSL were trace metals, NH4 + and reducing agent (Cys: cysteine sulfide). Supplementation of trace metals, NH4 + and CyS to CSL (20 g l−1, wet weight basis) yielded better growth and similar ethanol production as compared to control medium. Using 10 g l−1, the nutritional limitation led to reduced ethanol production. Higher concentrations of CSL (50 and 100 g l−1) were inhibitory for cell growth and ethanol production. The CSL could replace yeast extract, vitamins and minerals (excluding NH4 +). The optimized CSL medium produced 120 and 50 mM of ethanol and acetate, respectively. The CSL could provide as an inexpensive source of most of the nutrients required for the syngas fermentation, and thus could improve the economics of ethanol production from biomass derived synthesis gas by C. ragsdalei.

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Acknowledgments

This research was supported in part by USDACSREES Special Grant awards 2005-34447-15711 and 2006-34447-16939.

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Authors and Affiliations

  1. Department of Botany and Microbiology, The University of Oklahoma, 770 Van Vleet Oval, Norman, OK, 73019, USA

    Jyotisna Saxena & Ralph S. Tanner

  2. School of Environment and Natural Resources, The Ohio State University, 2021 Coffey Road, Columbus, OH, 43210, USA

    Jyotisna Saxena

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  1. Jyotisna Saxena
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  2. Ralph S. Tanner
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Correspondence to Jyotisna Saxena.

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Saxena, J., Tanner, R.S. Optimization of a corn steep medium for production of ethanol from synthesis gas fermentation by Clostridium ragsdalei . World J Microbiol Biotechnol 28, 1553–1561 (2012). https://doi.org/10.1007/s11274-011-0959-0

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  • DOI: https://doi.org/10.1007/s11274-011-0959-0

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