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Record number 539476
Title Multi-production of high added market value metabolites from diluted methane emissions via methanotrophic extremophiles
Author(s) Cantera, S.; Sánchez-Andrea, I.; Lebrero, R.; García-Encina, P.A.; Stams, Alfons J.M.; Muñoz, R.
Source Bioresource Technology 267 (2018). - ISSN 0960-8524 - p. 401 - 407.
DOI https://doi.org/10.1016/j.biortech.2018.07.057
Department(s) WIMEK
Microbiological Laboratory
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) CH-biorefinery - Ectoine - Exopolysaccharides - Hydroxyectoine - Methane abatement
Abstract

This study constitutes the first-proof-of-concept of a methane biorefinery based on the multi-production of high profit margin substances (ectoine, hydroxyectoine, polyhydroxyalkanoates (PHAs) and exopolysaccharides (EPS)) using methane as the sole carbon and energy source. Two bubble column bioreactors were operated under different magnesium concentrations (0.2, 0.02 and 0.002 g L−1) to validate and optimize this innovative strategy for valorization of CH4 emissions. High Mg2+ concentrations promoted the accumulation of ectoine (79.7–94.2 mg g biomass−1), together with high hydroxyectoine yields (up to 13 mg g biomass−1) and EPS concentrations (up to 2.6 g L culture broth−1). Unfortunately, PHA synthesis was almost negligible (14.3 mg L−1) and only found at the lowest Mg2+ concentration tested. Halomonas, Marinobacter, Methylophaga and Methylomicrobium, previously described as ectoine producers, were dominant in both bioreactors, Methylomicrobium being the only described methanotroph. This study encourages further research on CH4 biorefineries capable of creating value out of GHG mitigation.

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