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Characterization of pyrene degradation and metabolite identification by Basidioascus persicus and mineralization enhancement with bacterial-yeast co-culture.

Abstract：

:In this paper, we introduce pyrene degrader halotolerant yeast, Basidioascus persicus EBL-C16 and characterize its growth in different salt concentrations. Investigation of the removal of different concentrations of pyrene showed that B. persicus EBL-C16 was able to eliminate 50-90% of pyrene in the presence of 2.5% salt and also mineralize phenanthrene and anthracene. Growth and depletion kinetics of 500 mg L-1 of pyrene removal revealed 79% degradation and the growth rate reached 1.4 g L-1 of dry weight, decomposition constant rate was obtained as 0.074 day-1 and the half-life was 9.33 days. When minimal medium was replaced with Persian Gulf water, 48% increase in pyrene removal was detected by yeast strain. The mass spectrometry of the treated samples specified the phthalic acid pathway as the metabolic pathway of pyrene degradation by B. persicus. Study of the synergistic effect of using rhamnolipid and co-culture of yeast with Pseudomonas putida ATCC 12633 revealed that the combination of both of them with B. persicus increased 21% pyrene elimination. The findings of this study can be used to comprehend the mechanisms of oil hydrocarbon degradation by yeasts. Furthermore, the results demonstrated the promising potential of yeast-bacteria co-culture for cleaning of oil spills in marine and saline soil contaminated areas.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Kamyabi A,Nouri H,Moghimi H

doi

10.1016/j.ecoenv.2018.07.098

subject

Has Abstract

pub_date

2018-11-15 00:00:00

pages

471-477

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(18)30706-1

journal_volume

163

pub_type

杂志文章

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