Multi-factors on biodegradation kinetics of polycyclic aromatic hydrocarbons (PAHs) by Sphingomonas sp. a bacterial strain isolated from mangrove sediment

“…higher concentration of PAHs in winter than in summer) have been reported in several previous studies from other regions of the world including Guangzhou (31 ng g −1 in winter and 20 ng g −1 in summer), Taichung (56 ng g −1 in winter and 20 ng g −1 in summer), Shizuoka (41 ng g −1 in winter and 19 ng g −1 in summer), Hong Kong (310 ng g −1 in winter and 90 ng g −1 in summer) and Beijing (152 ng g −1 in winter and 118 ng g −1 in summer) reports. Similarly, this seasonal behaviour of PAHs was also studied in other regions as well, including Zonguldak (142 in winter and 6 in summer), Delhi (1157 ng g −1 in winter and 624 in summer) and Kaohsiung which had high concentrations of PAH in winter (183 ng g −1 ) and 95 ng g −1 in summer (Fang et al 2007;Tian et al 2009;Kume et al 2007;Della et al 2003;Sharma et al 2007;Chen et al 2008;Tan et al 2006;Wang et al 2008) (Table S2). …”

Section: Pah Concentrations In Chenab Rivermentioning

confidence: 57%

The relative abundance and seasonal distribution correspond with the sources of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of Chenab River, Pakistan

Hussain

Syed

Kamal

et al. 2016

Environ Monit Assess

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Chenab River is one of the most important rivers of Punjab Province (Pakistan) that receives huge input of industrial effluents and municipal sewage from major cities in the Central Punjab, Pakistan. The current study was designed to evaluate the concentration levels and associated ecological risks of USEPA priority polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of Chenab River. Sampling was performed from eight (n = 24) sampling stations of Chenab River and its tributaries. We observed a relatively high abundance of ∑16PAHs during the summer season (i.e. 554 ng g(-1)) versus that in the winter season (i.e. 361 ng g(-1)), with an overall abundance of two-, five- and six-ring PAH congeners. Results also revealed that the nitrate and phosphate contents in the sediments were closely associated with low molecular weight (LMW) and high molecular weight (HMW) PAHs, respectively. Source apportionment results showed that the combustion of fossil fuels appears to be the key source of PAHs in the study area. The risk quotient (RQ) values indicated that seven PAH congeners (i.e. phenanthrene, anthracene, fluoranthene, pyrene, benzo(a)pyrene, chrysene and benzo(a)anthracene) could pose serious threats to the aquatic life of the riverine ecosystem in Pakistan.

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“…Catalase (CAT) activity was quantified by measuring the rate of H2O2 disappearance at 240 nm (Chen and Wang 2006). The reaction mixture (3 ml) consisted of 1.95 ml 50 mmol l -1 phosphate buffer (pH 7.0), 1 ml 0.3% H2O2 and 0.05 ml enzyme extract.…”

Section: Enzymes Extraction and Assaysmentioning

confidence: 99%

“…One unit activity was defined as an absorbance change of 0.001 unit min -1 mg -1 . Peroxidase (POD) was measured spectrophotometrically in a 3 ml mixture containing 1 ml 0.3% H2O2, 0.95 ml guaiacol, 1 ml pH 7.0 phosphate buffer, and started with the 0.05 ml enzyme extraction (Chen and Wang 2006). In the presence of H2O2, POD catalyzes the transformation of guaiacol to tetraguaiacol (brown product).…”

Section: Enzymes Extraction and Assaysmentioning

confidence: 99%

Effects of polycyclic aromatic hydrocarbons exposure on antioxidant system activities and proline content in Kandelia candel

Song

Wang

Sun

et al. 2011

Oceanological and Hydrobiological Studies

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The antioxidant system effects of Kandelia candel were investigated under four different levels of PAH stress. The activities of antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), the responses to the change of malondialdehyde (MDA) contents and the accumulation of proline in K. candel were determined. Our results suggested that the activities of SOD, CAT, POD increased significantly in leaves and roots of K. candel (p≤0.05) with the increase of the external PAH concentrations, while in stems, the activities of these antioxidant enzymes were all significantly * Corresponding author: yswang@scsio.ac.cn; Tel/Fax: 8620-89023102(O) inhibited (p≤0.01). We also observed an increase of MDA in leaves, stems and roots, and an obvious correlation between MDA content and PAH concentrations in three locations, which showed that the change of MDA content could be used as a biomarker of K. candel under PAH stress. The proline content was found remarkably enhanced in leaves, stems and roots. However, a significant inverse correlation was observed between the proline content and SOD (r=-0.99, p≤0.01), POD (r=-0.95, p≤0.05) activities in stems. This study suggested that the antioxidative system of K. candel has an obvious organ-dependent feature when exposed to PAH contamination as revealed by discriminant analysis (DA).

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Multi-factors on biodegradation kinetics of polycyclic aromatic hydrocarbons (PAHs) by Sphingomonas sp. a bacterial strain isolated from mangrove sediment

Cited by 125 publications

References 42 publications

Anaerobic biodegradation of polycyclic aromatic hydrocarbons with amendment of iron(III) in mangrove sediment slurry

Anaerobic biodegradation of polycyclic aromatic hydrocarbons with amendment of iron(III) in mangrove sediment slurry

The relative abundance and seasonal distribution correspond with the sources of polycyclic aromatic hydrocarbons (PAHs) in the surface sediments of Chenab River, Pakistan

Effects of polycyclic aromatic hydrocarbons exposure on antioxidant system activities and proline content in Kandelia candel

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