화학공학소재연구정보센터
Biotechnology Letters, Vol.42, No.11, 2299-2307, 2020
Aerobic biodegradation of high explosive hexahydro-1,3,5-trinitro-1,3,5-triazine byJanibacter cremeusisolated from contaminated soil
Objective To evaluate the ability ofJanibacter cremeusa soil bacterium isolated from explosive contaminated site in degradation of hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) and to study enzyme responsible for degradation. Results The isolate exhibited 88% degradation of RDX in 30 days of incubation. The biodegradation process followed the first order kinetics. The half- life of RDX was calculated to be 11.088 days. The RDX degradation process was complemented by concomitant release of nitrite ions with 0.78 mol of nitrite released per mole of RDX. The metabolites; Trinitroso- RDX, diamino-RDX, trimino-RDX, bis- (hydroxymethyl) nitramine and methylenedintramine derivative, viz, methylene-N- (hydroxy- methyl)- hydroxylamine-N-(hydroxymethyl) nitroamine corresponding to the molecular weights 174, 162, 132, 122 and 167 Da respectively were also detected. Nitroreductase enzyme was found to be responsible for RDX degradation. Conclusion J. cremeuscould degrade RDX as sole source of nitrogen, via three different pathways wherein, Nitroreductase enzyme was found to play a major role. The efficient degradation of RDX makesJ. cremeussuitable in treatment of contaminated water and soil at field scale levels.