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Publisher DOI: 10.1186/s12934-018-0937-4
Title: Development of a production chain from vegetable biowaste to platform chemicals
Language: English
Authors: Schmidt, Annemarie 
Sturm, Gunnar 
Lapp, Christian Jonas 
Siebert, Daniel 
Saravia, Florencia 
Horn, Harald 
Ravi, Padma Priya 
Lemmer, Andreas 
Gescher, Johannes 
Keywords: Acetoin;Bioelectrochemical system;Biowaste;Organic acids;Propionate;Vegetable waste
Issue Date: 13-Jun-2018
Publisher: Biomed Central
Source: Microbial Cell Factories 17 (1): 90 (2018-06-13)
Journal: Microbial cell factories 
Abstract (english): 
Background: A future bioeconomy relies on the development of technologies to convert waste into valuable compounds. We present here an attempt to design a biotechnological cascade for the conversion of vegetable waste into acetoin and electrical energy.

Results: A vegetable waste dark fermentation effluent containing mainly acetate, butyrate and propionate was oxidized in a bioelectrochemical system. The achieved average current at a constant anode potential of 0 mV against standard hydrogen electrode was 177.5 ± 52.5 μA/cm2. During this step, acetate and butyrate were removed from the effluent while propionate was the major remaining component of the total organic carbon content comprising on average 75.6%. The key players with regard to carbon oxidation and electrode reduction were revealed using amplicon sequencing and metatranscriptomic analysis. Using nanofiltration, it was possible to concentrate the propionate in the effluent. The effluent was revealed to be a suitable medium for biotechnological production strains. As a proof of principle, the propionate in the effluent of the bioelectrochemical system was converted into the platform chemical acetoin with a carbon recovery of 86%.

Conclusions: To the best of our knowledge this is the first report on a full biotechnological production chain leading from vegetable waste to the production of a single valuable platform chemical that integrates carbon elimination steps leading to the production of the valuable side product electrical energy.
DOI: 10.15480/882.3751
ISSN: 1475-2859
Document Type: Article
Funded by: Baden-Württemberg, Ministerium für Umwelt, Klima und Energiewirtschaft
Bundesministerium für Bildung und Forschung 
More Funding information: This project was supported by the Ministry of the Environment, Climate Protection and the Energy Sector Baden-Württemberg (BWB15006), as well as Federal Ministry of Education and Research by program 031B0365A.
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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