Abstract：
:Valeric acid and its ester derivatives are chemical compounds with a high industrial interest. Here we report a new approach to produce them from crude glycerol, by combining propionic acid fermentation with chain elongation. Propionic acid was produced by Propionibacterium acidipropionici (8.49 ± 1.40 g·L-1). In the subsequent mixed population chain elongation, valeric acid was the dominant product (5.3 ± 0.69 g·L-1) of the chain elongation process. Residual glycerol negatively impacted the selectivity of mixed culture chain elongation towards valeric acid, whereas this was unaffected when Clostridium kluyveri was used as bio-catalyst. Valeric acid could be selectively isolated and upgraded to ethyl valerate by using dodecane as extractant and medium for esterification, whereas shorter-chain carboxylic acids could be recovered by using a 10 wt% solution of trioctylphosphine oxide (TOPO) in dodecane. Overall, our work shows that the combined fermentation, electrochemistry and homogeneous catalysis enables fine chemical production from side streams.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Ganigué R,Naert P,Candry P,de Smedt J,Stevens CV,Rabaey Kdoi
10.1016/j.biortech.2019.121574subject
Has Abstractpub_date
2019-10-01 00:00:00pages
121574eissn
0960-8524issn
1873-2976pii
S0960-8524(19)30804-1journal_volume
289pub_type
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