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Formulation and stabilization of an Arthrobacter strain with good storage stability and 4-chlorophenol-degradation activity for bioremediation
SLU Swedish University of Agricultural Sciences, Sweden.
VU University Amsterdam, The Netherlands.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.ORCID iD: 0000-0001-6653-0643
SLU Swedish University of Agricultural Sciences, Sweden.
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2018 (English)In: Applied Microbiology and Biotechnology, ISSN 0175-7598, E-ISSN 1432-0614Article in journal (Refereed) In press
Abstract [en]

Chlorophenols are widespread and of environmental concern due to their toxic and carcinogenic properties. Development of less costly and less technically challenging remediation methods are needed; therefore, we developed a formulation based on micronized vermiculite that, when air-dried, resulted in a granular product containing the 4-chlorophenol (4-CP)-degrading Gram-positive bacterium Arthrobacter chlorophenolicus A6. This formulation and stabilization method yielded survival rates of about 60% that remained stable in storage for at least 3 months at 4 °C. The 4-CP degradation by the formulated and desiccated A. chlorophenolicus A6 cells was compared to that of freshly grown cells in controlled-environment soil microcosms. The stabilized cells degraded 4-CP equally efficient as freshly grown cells in two different set-ups using both hygienized and non-treated soils. The desiccated microbial product was successfully employed in an outdoor pot trial showing its effectiveness under more realistic environmental conditions. No significant phytoremediation effects on 4-CP degradation were observed in the outdoor pot experiment. The 4-CP degradation kinetics from both the microcosms and the outdoor pot trial were used to generate a predictive model of 4-CP biodegradation potentially useful for larger-scale operations, enabling better bioremediation set-ups and saving of resources. This study also opens up the possibility of formulating and stabilizing also other Arthrobacter strains possessing different desirable pollutant-degrading capabilities.

Place, publisher, year, edition, pages
2018.
Keywords [en]
Arthrobacter, Bioaugmentation, Bioremediation, Formulation, Microbial stabilization, Bacteria, Biodegradation, Biotechnology, Cells, Cytology, Degradation, Pollution, Strain, Bio-augmentation, Carcinogenic properties, Controlled environment, Environmental concerns, Environmental conditions, Gram-positive bacterium, Stabilization
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-33249DOI: 10.1007/s00253-017-8706-6Scopus ID: 2-s2.0-85040797362OAI: oai:DiVA.org:ri-33249DiVA, id: diva2:1182194
Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-03-16Bibliographically approved

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