Biodegradation of Synthetic Pyrethroid Insecticide Deltamethrin by Stenotrophomonas maltophilia Strain DRNB1

Abstract

: Deltamethrin is one of the most used pyrethroid insecticide in different regions of the world. It is the fastacting insecticide that disrupts the cellular sodium channels. The deltamethrin residues are highly retained in environments, particularly in soil and water and have inevitable side effects on natural resources and human health. The most efficient, economical, and environmentally beneficial way of removing deltamethrin from contaminated sites is bioremediation. Bacteria are the most used biological agents in biodegradation studies. Thus, in this study deltamethrin-degrading bacteria Stenotrophomonas maltophilia strain DRNB1 was isolated and characterised. The bacterial growth was analysed by UV-spectrophotometer and deltamethrin degradation was studied by GC-MS analysis. S. maltophilia strain DRNB1 used deltamethrin as the sole carbon source for growth. Deltamethrin degradation efficiency of DRNB1 was 89.2% in insecticide supplemented media and 93% in presence of additional glucose in mineral media. These results implies that S. maltophilia strain DRNB1 could be used as a bioremediation technology for deltamethrin contaminated environments.