Bacterial contaminants of fuel ethanol production

Journal of Industrial Microbiology & Biotechnology
Kelly A Skinner, Timothy D Leathers

Abstract

Bacterial contamination is an ongoing problem for commercial fuel ethanol production facilities. Both chronic and acute infections are of concern, due to the fact that bacteria compete with the ethanol-producing yeast for sugar substrates and micronutrients. Lactic acid levels often rise during bouts of contamination, suggesting that the most common contaminants are lactic acid bacteria. However, quantitative surveys of commercial corn-based fuel ethanol facilities are lacking. For this study, samples were collected from one wet mill and two dry grind fuel ethanol facilities over a 9 month period at strategic time points and locations along the production lines, and bacterial contaminants were isolated and identified. Contamination in the wet mill facility consistently reached 10(6) bacteria/ml. Titers from dry grind facilities were more variable but often reached 10(8)/ml. Antibiotics were not used in the wet mill operation. One dry grind facility added antibiotic to the yeast propagation tank only, while the second facility dosed the fermentation with antibiotic every 4 h. Neither dosing procedure appeared to reliably reduce overall contamination, although the second facility showed less diversity among contaminants. Lactobac...Continue Reading

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Citations

May 4, 2010·Applied Microbiology and Biotechnology·Johanna BlomqvistVolkmar Passoth
Jan 9, 2013·Current Microbiology·Pennapa ManitchotpisitTimothy D Leathers
Feb 24, 2006·Journal of Industrial Microbiology & Biotechnology·Tara GravesRonan Power
Aug 30, 2007·Journal of Industrial Microbiology & Biotechnology·Kenneth M BischoffTimothy D Leathers
Oct 18, 2007·Journal of Industrial Microbiology & Biotechnology·Siqing LiuTimothy D Leathers
Jul 4, 2008·Journal of Industrial Microbiology & Biotechnology·Itsuki WatanabeJun Shima
May 23, 2009·Journal of Industrial Microbiology & Biotechnology·Eva Albers, Christer Larsson
Apr 21, 2011·Journal of Industrial Microbiology & Biotechnology·Emma JohanssonChrister Larsson
Dec 13, 2006·Biotechnology Letters·Kelly A Skinner-NemecTimothy D Leathers
Dec 26, 2012·World Journal of Microbiology & Biotechnology·Esha KhullarVijay Singh
Sep 11, 2010·Science·Jonathan M GalazkaJamie H D Cate
Nov 26, 2010·BMC Microbiology·Brigida T L LucenaMarcos Antonio de Morais
Oct 26, 2011·Microbial Cell Factories·Willem M de Vos
Nov 8, 2013·Antonie van Leeuwenhoek·Thiago Olitta BassoLuiz Carlos Basso
Jul 16, 2014·Bioresource Technology·Timothy D LeathersAmber M Anderson
Jul 31, 2012·Journal of Industrial Microbiology & Biotechnology·Rafael Barros de SouzaMarcos Antonio de Morais
Oct 31, 2015·Critical Reviews in Biotechnology·M JobardT Sime-Ngando
Aug 29, 2014·Biotechnology for Biofuels·Juliano Bertozzi Silva, Dominic Sauvageau
Jan 2, 2016·FEMS Microbiology Letters·Allyson Andrade MendonçaMarcos Antonio de Morais
Aug 11, 2015·Bioresource Technology·Joseph O RichMelinda S Nunnally
Sep 22, 2010·Bioresource Technology·Joseph O RichKenneth M Bischoff
May 27, 2008·International Journal of Food Microbiology·M HaakensenB Ziola
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Feb 10, 2011·Biotechnology Journal·João R M AlmeidaMarie F Gorwa-Grauslund
Jul 21, 2011·Letters in Applied Microbiology·M BecknerT G Phister

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