Gorden J, Geiser E, Wierckx N, Blank LM, Zeiner T, Brandenbusch C. Integrated process development of a reactive extraction concept for itaconic acid and application to a real fermentation broth.
Eng Life Sci 2017;
17:809-816. [PMID:
32624827 DOI:
10.1002/elsc.201600253]
[Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 01/24/2017] [Accepted: 02/20/2017] [Indexed: 12/17/2022] Open
Abstract
Itaconic acid (IA) has a high potential to be used as a bio-based platform chemical and its biocatalytic production via fermentation has significantly improved within the last decade. Additionally downstream processing using reactive extraction (RE) was described, potentially enabling a more efficient sustainable bioprocess producing IA. The bottleneck to overcome is the connection of up- and downstream processing, caused by lack of biocompatibility of the RE systems and direct application to fermentation broth. Within this study, a biocompatible RE system for IA is defined (pH dependency, extraction mechanism) and used for direct application to a fermentation broth. By optimizing the biocatalyst, the production medium, and the extraction system in an integrated approach, it was possible to define critical parameters that enabled a tuning of the overall bioprocess. With an extraction yield of Y IA = 0.80 ± 0.03, IA could be produced as sole carboxylic acid ( b IA , 0 aq = 0.490 mol/kgaq) using a RE system consisting of ethyl oleate as organic solvent and tri-n-octylamine as extractant ( b T - C 8 org = 0.6 mol/kgorg). This work is a proof of concept and demonstrates that by joint consideration of up- and downstream processing, optimized bioprocesses can be developed.
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