Abstract
Acetamiprid (ACE) belongs to the neonicotinoid class of systemic broad-spectrum insecticides, which are the most highly effective and largest-selling insecticides worldwide for crop protection. As neonicotinoid insecticides persist in crops, biotransformation of these insecticides represents a promising approach for improving the safety of foods. Here, the elimination of ACE from a liquid medium by the white-rot fungus Phanerochaete sordida YK-624 was examined. Under ligninolytic and non-ligninolytic conditions, 45% and 30% of ACE were eliminated, respectively, after 15 days of incubation. High-resolution electrospray ionization mass spectra and nuclear magnetic resonance analyses of a metabolite identified in the culture supernatant suggested that ACE was N-demethylated to (E)-N 1-[(6-chloro-3-pyridyl)-methyl]-N 2-cyano-acetamidine, which has a much lower toxicity than ACE. In addition, we investigated the effect of the cytochrome P450 inhibitor piperonyl butoxide (PB) on the elimination of ACE. The elimination rate of ACE by P. sordida YK-624 was markedly reduced by the addition of either 0.01 or 0.1 mM PB to the culture medium. These results suggest that cytochrome P450 plays an important role in the N-demethylation of ACE by P. sordida YK-624.
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Wang, J., Hirai, H. & Kawagishi, H. Biotransformation of acetamiprid by the white-rot fungus Phanerochaete sordida YK-624. Appl Microbiol Biotechnol 93, 831–835 (2012). https://doi.org/10.1007/s00253-011-3435-8
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DOI: https://doi.org/10.1007/s00253-011-3435-8