Humic Acid Reduction by Propionibacterium freudenreichii and Other Fermenting Bacteria

• DOI: 10.1128/aem.64.11.4507-4512.1998
• Publication Date: 2019-12-19T18:56:13Z
• Authors: Marcus Benz; Bernhard Schink; Andreas Brune
• Keywords: Propionibacterium freudenreichii; Electron acceptor; Ferricyanide

ABSTRACT Iron-reducing bacteria have been reported to reduce humic acids and low-molecular-weight quinones with electrons from acetate or hydrogen oxidation. Due the rapid chemical reaction of amorphous ferric iron reduced products, redox mediators may play an important role in biological reduction. Since many anaerobic that are not able directly known transfer other external acceptors, such as ferricyanide, 2,6-anthraquinone disulfonate (AQDS), molecular oxygen, we tested several physiologically different species fermenting determine their abilities acids. Propionibacterium freudenreichii , Lactococcus lactis Enterococcus cecorum all shifted fermentation patterns towards more oxidized products when were present; P. even propionate under these conditions. When was added reoxidize electron acceptor, found be equally effective they substoichiometric amounts. These findings indicate addition iron-reducing bacteria, also capable channeling oxidations via This information needs considered future studies flow soils sediments.