Triclosan affects the microbial community in simulated sewage-drain-field soil and slows down xenobiotic degradation

TY - JOUR

T1 - Triclosan affects the microbial community in simulated sewage-drain-field soil and slows down xenobiotic degradation

AU - Svenningsen, Hanne

AU - Henriksen, Trine

AU - Priemé, Anders

AU - Johnsen, Anders R.

PY - 2011/6

Y1 - 2011/6

N2 - Effects of the common antibacterial agent triclosan on microbial communities and degradation of domestic xenobiotics were studied in simulated sewage-drain-field soil. Cultivable microbial populations decreased 22-fold in the presence of 4 mg kg-1 of triclosan, and triclosan-resistant Pseudomonas strains were strongly enriched. Exposure to triclosan also changed the general metabolic profile (Ecoplate substrate profiling) and the general profile (T-RFLP) of the microbial community. Triclosan degradation was slow at all concentrations tested (0.33-81 mg kg-1) during 50-days of incubation. Mineralization experiments (14C-tracers) and chemical analyses (LC-MS/MS) showed that the persistence of a linear alkylbenzene sulfonate (LAS) and a common analgesic (ibuprofen) increased with increasing triclosan concentrations (0.16-100 mg kg-1). The largest effect was seen for LAS mineralization which was severely reduced by 0.16 mg kg -1 of triclosan. Our findings indicate that environmentally realistic concentrations of triclosan may affect the efficiency of biodegradation in percolation systems.

AB - Effects of the common antibacterial agent triclosan on microbial communities and degradation of domestic xenobiotics were studied in simulated sewage-drain-field soil. Cultivable microbial populations decreased 22-fold in the presence of 4 mg kg-1 of triclosan, and triclosan-resistant Pseudomonas strains were strongly enriched. Exposure to triclosan also changed the general metabolic profile (Ecoplate substrate profiling) and the general profile (T-RFLP) of the microbial community. Triclosan degradation was slow at all concentrations tested (0.33-81 mg kg-1) during 50-days of incubation. Mineralization experiments (14C-tracers) and chemical analyses (LC-MS/MS) showed that the persistence of a linear alkylbenzene sulfonate (LAS) and a common analgesic (ibuprofen) increased with increasing triclosan concentrations (0.16-100 mg kg-1). The largest effect was seen for LAS mineralization which was severely reduced by 0.16 mg kg -1 of triclosan. Our findings indicate that environmentally realistic concentrations of triclosan may affect the efficiency of biodegradation in percolation systems.

U2 - 10.1016/j.envpol.2011.02.052

DO - 10.1016/j.envpol.2011.02.052

M3 - Journal article

SN - 0269-7491

VL - 159

SP - 1599

EP - 1605

JO - Environmental Pollution

JF - Environmental Pollution

IS - 6

ER -