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  • Biodegradation of cypermethrin by a novel Catellibacterium sp. strain CC-5 isolated from contaminated soil.

Biodegradation of cypermethrin by a novel Catellibacterium sp. strain CC-5 isolated from contaminated soil.

Canadian journal of microbiology (2013-05-08)
Haoyu Zhao, Yucong Geng, Long Chen, Ke Tao, Taiping Hou
ABSTRACT

The bacterial strain CC-5, isolated from contaminated soil and identified as Catellibacterium sp. based on morphology and partial 16S rDNA gene sequence analysis, utilized cypermethrin as its sole carbon source and degraded 97% of 100 mg·L(-1) cypermethrin within 7 days. The optimal degradation conditions were determined to be 30 °C and pH 7.0. Degradation was found to follow a first-order model at initial cypermethrin concentrations below 400 mg·L(-1). Strain CC-5 suffered substrate inhibition at high cypermethrin concentrations, and the biodegradation kinetics were successfully described by the Haldane model, with a maximal specific degradation rate of 1.36 day(-1), an inhibition constant of 164.61 mg·L(-1), and a half-saturation constant of 101.12 mg·L(-1). Inoculating cypermethrin-treated soil samples with strain CC-5 resulted in a higher rate of cypermethrin removal than that in noninoculated soil, regardless of whether the soil had previously been sterilized. These results reveal that the bacterial strain may possess potential to be used in bioremediation of pyrethroid-contaminated environment.

MATERIALS
Product Number
Brand
Product Description

Supelco
Cypermethrin, certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
Supelco
Cypermethrin, PESTANAL®, analytical standard
Supelco
Cypermethrin solution, 100 μg/mL in acetonitrile, PESTANAL®, analytical standard
Supelco
α-Cypermethrin, PESTANAL®, analytical standard