Recalcitrance of 1,1-Dichloro-2,2- bis ( p -chlorophenyl)ethylene (DDE) to Cometabolic Degradation by Pure Cultures of Aerobic and Anaerobic Bacteria

Megharaj, Mallavarapu; Jovcic, A.; Boul, H. L.; Thiele, Jürgen

doi:10.1007/s002449900235

Cited by 20 publications

(3 citation statements)

References 21 publications

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“…Organochlorine pesticides resist chemical and biological degradation (Megharaj et al 1997;Gevao et al 2000), consequently they bioaccumulate in the food chain (Bernhoft et al 1997;Ruus et al 1999;Senthilkumar et al 1999;Borga et al 2001;Fisk et al 2001). Humans may be exposed by the oral route to pesticides through both food and drinking water (Adeyeye and Osibanjo 1999;Badach et al 2000;Harris et al 2001;Chun and Kang 2003).…”

Section: Introductionmentioning

confidence: 96%

Assessment of average exposure to organochlorine pesticides in southern Togo from water, maize (Zea mays) and cowpea (Vigna unguiculata)

Mawussi

Sanda

Merlina

et al. 2009

Food Additives & Contaminants: Part A

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Drinking water, cowpea and maize grains were sampled in some potentially exposed agro-ecological areas in Togo and analysed for their contamination by some common organochlorine pesticides. A total of 19 organochlorine pesticides were investigated in ten subsamples of maize, ten subsamples of cowpea and nine subsamples of drinking water. Analytical methods included solvent extraction of the pesticide residues and their subsequent quantification using gas chromatography-mass spectrometry (GC/MS). Estimated daily intakes (EDIs) of pesticides were also determined. Pesticides residues in drinking water (0.04-0.40 microg l(-1)) were higher than the maximum residue limit (MRL) (0.03 microg l(-1)) set by the World Health Organization (WHO). Dieldrin, endrin, heptachlor epoxide and endosulfan levels (13.16-98.79 microg kg(-1)) in cowpea grains exceeded MRLs applied in France (10-50 microg kg(-1)). Contaminants' levels in maize grains (0.53-65.70 microg kg(-1)) were below the MRLs (20-100 microg kg(-1)) set by the Food and Agriculture Organization (FAO) and the WHO. EDIs of the tested pesticides ranged from 0.02% to 162.07% of the acceptable daily intakes (ADIs). Population exposure levels of dieldrin and heptachlor epoxide were higher than the FAO/WHO standards. A comprehensive national monitoring programme on organochlorine pesticides should be undertaken to include such other relevant sources like meat, fish, eggs and milk.

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Section: Introductionmentioning

confidence: 96%

Assessment of average exposure to organochlorine pesticides in southern Togo from water, maize (Zea mays) and cowpea (Vigna unguiculata)

Mawussi

Sanda

Merlina

et al. 2009

Food Additives & Contaminants: Part A

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“…Construction of genetically modified strains is especially relevant in the case of pollutants, such as polychlorinated biphenyls (PCBs) and chloroethylenes, for which, as far as is known, no microbial catabolic pathways have been evolved (Megharaj et al 1997) or no optimal pathways are available (Brazil et al 1995). Genetically engineered microbes (GEMs) have been constructed in order to degrade those pollutants.…”

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confidence: 99%

Rhizoremediation: A Beneficial Plant-Microbe Interaction

Kuiper¹,

Lagendijk²,

Bloemberg³

et al. 2004

MPMI

751

394

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Worldwide, contamination of soil and ground water is a severe problem. The negative effects of pollutants on the environment and on human health are diverse and depend on the nature of the pollution. The search for alternative methods for excavation and incineration to clean polluted sites resulted in the application of bioremediation techniques. In this review, we describe some generally accepted bioremediation tools and subsequently focus on the combination of two approaches, phytoremediation and bioaugmentation, resulting in rhizoremediation. During rhizoremediation, exudates derived from the plant can help to stimulate the survival and action of bacteria, which subsequently results in a more efficient degradation of pollutants. The root system of plants can help to spread bacteria through soil and help to penetrate otherwise impermeable soil layers. The inoculation of pollutant-degrading bacteria on plant seed can be an important additive to improve the efficiency of phytoremediation or bioaugmentation.

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“…DDT primarily consist of 65-80% of p,p′-DDT, 15-21% of o,p′-DDT, 4% of p,p′-DDD, and 1.5% of 1-(p-chlorophenyl)-2,2,2-trichloroethanol [13]. DDT degradation products are the result of aerobic biotic degradation, abiotic dehydrochlorination, and photochemical decomposition [12,22]. According to the U.S. Geological Survey report, the major degradation products were p,p′-DDE (60% in urban and 48% in rural areas), which followed by p,p′-DDD, p,p′-DDT, o,p′-DDD, o,p′-DDT, and o,p′-DDE [22].…”

Section: Introductionmentioning

confidence: 99%

The uptake modeling of DDT and its degradation products (o,p′-DDE and p,p′-DDE) from soil

2020

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Dichloro-diphenyl-trichloroethane (DDT) has been extensively used to control malaria during World War II as well as the other agricultural pests. DDT persists in the environment and accumulates in many living organisms. Also, the degradation products of DDT, which have also a similar chemical structure, could pose the same risk to the environment and human health. Measuring DDT and its degradation products in the environment could be challenging and costs money and time. Thus, modeling is an alternative method used by researchers to estimate the environmental relevant levels of the contaminants. The present study estimates the uptake levels of DDT and its degradation products i.e. o,p′-DDE and p,p′-DDE by crop-specific models (e.g. root, potato, leafy vegetables, cereal, fruit-tree models) in the root, potato, leaves, fruit, cereal, and water compartments by using the known environmental concentrations of DDT and its degradation products (µg kg −1) in soil sampled from Soke, Aydin. According to the crop-specific model results, predicted accumulation levels of DDT and its degradation products were found mainly in leafy vegetables, roots, cereals, and potato. The highest concentration levels were found in leafy vegetables in soil, followed by root, cereals, and potato respectively; however, leaves, fruits, and water had a low amount of accumulation of DDT and its degradation products. Further models are needed to evaluate risk assessment of the environmental compounds to human health and the environment.

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Recalcitrance of 1,1-Dichloro-2,2- bis ( p -chlorophenyl)ethylene (DDE) to Cometabolic Degradation by Pure Cultures of Aerobic and Anaerobic Bacteria

Cited by 20 publications

References 21 publications

Assessment of average exposure to organochlorine pesticides in southern Togo from water, maize (Zea mays) and cowpea (Vigna unguiculata)

Assessment of average exposure to organochlorine pesticides in southern Togo from water, maize (Zea mays) and cowpea (Vigna unguiculata)

Rhizoremediation: A Beneficial Plant-Microbe Interaction

The uptake modeling of DDT and its degradation products (o,p′-DDE and p,p′-DDE) from soil

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