Study of novel pure culture HBCD-1, effectively degrading Hexabromocyclododecane, isolated from an anaerobic reactor

Advances in enantioselective analysis of chiral brominated flame retardants. Current status, limitations and future perspectives

“…that HBCD is sequentially debrominated via dihaloelimination where at each step there is the loss of two bromines from vicinal carbons with the subsequent formation of a double bond between the adjacent carbon atoms. This assumption was confirmed by (Peng et al, 2015). In this study, a total of 4 metabolites were detected during the anaerobic biodegradation of HBCDs by process by strain HBCD-1, a pure culture isolated from a continuous anaerobic reactor over 300-days acclimation: Tetrabromocyclododecene (TBCD), Dibromocyclododecadiene (DBCD) 1,5,9-cyclododecatriene (CDT) and 2-Dodecene.…”

Diastereoisomer-Specific Biotransformation of Hexabromocyclododecanes by a Mixed Culture Containing Dehalococcoides mccartyi Strain 195

“…Similar debromination products and pathway have been reported in anaerobic degradation of HBCD by pure culture of Achromobacter sp. as well as in digester sludge and freshwater aquatic sediments ( Davis et al, 2006 ; Peng et al, 2015 ).…”

“…Our observations are consistent with a prior report which showed Achromobacter sp. HBCD-1 could anaerobically transform 35.1% of 5000 μg L -1 HBCD in its growth medium within 8 days ( Peng et al, 2015 ). However, it is difficult to make a detailed comparison of our observations with other studies of transformation of HBCD by OHRB due to limited published data.…”

“…The pattern of transformation rates of α-, β-, and γ-HBCD by the mixed culture used in this study ( Figure 6A ) was consistent with that of the three diastereoisomers by the anaerobic bacterium Achromobacter sp. HBCD-1 ( Peng et al, 2015 ). In contrast, it was reported that the anaerobic biotransformation of α-HBCD in sewage sludge ( Gerecke et al, 2006 ) and river sediments ( Davis et al, 2006 ) was slower than that of β-HBCD and γ-HBCD.…”

“…However, very little is known about the transformability of HBCD by pure or mixed cultures of anaerobic microbes. Until now, only two HBCD-degrading bacteria have been isolated ( Peng et al, 2015 ) and no mixed cultures containing anaerobic microbes have been demonstrated to be able to debrominate HBCD.…”