Degradation Characteristics of Toluene, Benzene, Ethylbenzene, and Xylene by Stenotrophomonas maltophilia T3-c

Abstract

Stenotrophomonas maltophilia T3-c, isolated from a biofilter for the removal of benzene, toluene, ethylbenzene, and xylene (BTEX), could grow in a mineral salt medium containing toluene, benzene, or ethylbenzene as the sole source of carbon. The effect of environmental factors such as initial toluene mass, medium pH, and temperature on the degradation rate of toluene was investigated. The cosubstrate interactions in the BTEX mixture by the isolate were also studied. Within the range of initial toluene mass (from 23 to 70 µmol), an increased substrate concentration increased the specific degradation of toluene by S. maltophilia T3-c. The toluene degradation activity of S. maltophilia T3-c could be maintained at a broad pH range from 5 to 8. The rates at 20 and 40 ºC were 43 and 83%, respectively, of the rate at 30 ºC. The specific degradation rates of toluene, benzene, and ethylbenzene by strain T3-c were 2.38, 4.25, and 2.06 µmol/g-DCW/hr.

Degradation of methomyl by the novel bacterial strain Stenotrophomonas maltophilia M1

“…Based upon this finding, the isolate was designated as Stenotrophomonas maltophilia M1 strain. It has been reported that S. maltophilia is able to degrade many xenobiotic compounds (Lee et al 2002) and to detoxify high molecular weight polycyclic aromatic hydrocarbons (Juhasz et al 2000). Therefore, it possesses a potential for soil decontamination (bioremediation).…”

A Stenotrophomonas maltophilia Multilocus Sequence Typing Scheme for Inferring Population Structure

“…It has, for instance, been isolated from the rhizosphere of various plants and animals (14,27,37). Due to its tolerance against cadmium and its ability to degrade xenobiotic compounds, it has been proposed for remediation of contaminated ground (9,39). Increasingly, it is being isolated from immunosuppressed individuals and intensive care and cystic fibrosis (CF) patients and has been shown to be resistant to many antimicrobial agents (16,17,69).…”

Identification of triclosan-degrading bacteria using stable isotope probing, fluorescence in situ hybridization and microautoradiography

“…The finding of a few Stenotrophomonas-related clones in the 13 C-labelled DNA clone library could indicate a broader diversity of triclosan degraders or the presence of multiple degradation steps catalysed by different micro-organisms. Although members of Stenotrophomonas have previously been shown to be involved in the degradation of environmental pollutants with aromatic structures such as p-nitrophenol (Liu et al, 2007), nonylphenol (Soares et al, 2003) and benzene (Lee et al, 2002), their involvement in degradation of triclosan was not confirmed by the MAR-FISH approach. Another betaproteobacterial group was found to be present in similar numbers to Methylobacillus and with similar triclosan degradation activity; however, these cells were not identified by the SIP approach.…”