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Reduction of invasive bacteria in ethanol fermentations using bacteriophages
Author(s) -
WorleyMorse Thomas O.,
Deshusses Marc A.,
Gunsch Claudia K.
Publication year - 2015
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.25586
Subject(s) - lactobacillus plantarum , bacteria , yeast , fermentation , microbiology and biotechnology , bacteriophage , lactobacillus , ethanol , food science , ethanol fuel , chemistry , biology , lactic acid , biochemistry , escherichia coli , genetics , gene
Invasive Lactobacillus bacteria inhibit ethanol fermentations and reduce final product yields. Due to the emergence of antibiotic resistant strains of Lactobacillus spp., alternative disinfection strategies are needed for ethanol fermentations. The feasibility of using the bacteriophage (phage) 8014‐B2 to control Lactobacillus plantarum in ethanol fermentations by Saccharomyces cerevisiae was investigated. In 48 h media‐based shake flask fermentations, phages achieved greater than 3‐log inactivation of L. plantarum , protected final ethanol yields, and maintained yeast viability. The phage‐based bacterial disinfection rates depended on both the initial phage and bacterial concentrations. Furthermore, a simple set of kinetic equations was used to model the yeast, bacteria, phage, reducing sugars, and ethanol concentrations over the course of 48 h, and the various kinetic parameters were determined. Taken together, these results demonstrate the applicability of phages to reduce L. plantarum contamination and to protect final product yields in media‐based fermentations. Biotechnol. Bioeng. 2015;112: 1544–1553. © 2015 Wiley Periodicals, Inc.