Nanoparticles and Nano-polymer Composite Interactions with Microbial Biofilm

E. Sahle-Demessie, H. Jing, G.A. Sorial
U.S. Environmental Protection Agency,
United States

Keywords: biofilm-nanoparticle interaction, bacterial surface adhesion, CNT-polymer composite


Environmental biofilms are efficient binding matrices for nanoparticles (NPs) and this can be attributed largely to the extracellular polymeric substances (EPS) that hold biofilms together. There is a significant accumulations of NPs occurred in biofilms of riverine- and marine-mesocosms. This interaction could influence the fate and transport of nanoparticles in an aquatic system, which also affects the environmental partitioning of NPs within natural systems. This study presents data on the interactions between NPs and the biofilm as a three-step process: (1) transport of NPs to the vicinity of the biofilm; (2) attachment to the biofilm surface; and (3) migration within the biofilm. The interaction of silver and ceria nanoparticles on gram-positive and gram-negative bacteria biofilm attachment were studied. Advancing our mechanistic understanding of NP–biofilm interactions will enable better risk assessment of nanotechnology as well as sustainable design of NPs.