The Experts below are selected from a list of 270 Experts worldwide ranked by ideXlab platform
K Sakai - One of the best experts on this subject based on the ideXlab platform.
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degradation of Polychlorinated dibenzo p dioxins and Polychlorinated Dibenzofurans by the white rot fungus phanerochaete sordida yk 624
Applied and Environmental Microbiology, 1996Co-Authors: S Takada, Takahiro Matsueda, R. Kondo, M Nakamura, K SakaiAbstract:A method for the degradation of dioxins by white rot fungi was developed. Degradation of a mixture of 10 kinds of tetra- to octachlorodibenzo-p-dioxins (Polychlorinated dibenzo-p-dioxins [PCDDs]) and tetra- to octachloroDibenzofurans (Polychlorinated Dibenzofurans [PCDFs]), which were chlorinated at 2-, 3-, 7-, and 8-positions of the molecules, by the white rot fungus Phanerochaete sordida YK-624 was studied in a stationary low-nitrogen medium. The percent degradation values of PCDDs and PCDFs were approximately 40 (tetra-chloro-) to 76% (hexachloro-) and 45 (tetrachloro-) to 70% (hexachloro-), respectively. Metabolites of 2,3,7,8-tetra- and octaCDD formed by P. sordida YK-624 included 4,5-dichlorocatechol and tetrachlorocatechol, respectively. These results suggest that white rot fungus is able to substantially degrade both PCDDs and PCDFs. This is the first report of the degradation of highly chlorinated PCDDs and PCDFs by a microorganism.
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Degradation of Polychlorinated Dibenzo-p-Dioxins and Polychlorinated Dibenzofurans by the White Rot Fungus
1996Co-Authors: Takahiro Matsueda, S Takada, R. Kondo, K Sakai, M Nakamura, Takahiko MatsuedaAbstract:dibenzo-p-dioxins and Polychlorinated Dibenzofurans by the white rot fungus Phanerochaete sordida YK-624
Vikas Khurana - One of the best experts on this subject based on the ideXlab platform.
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Extraction of Polychlorinated dibenzo-p-dioxins and Polychlorinated Dibenzofurans from environmental samples using accelerated solvent extraction (ASE)
Chemosphere, 1997Co-Authors: B. E. Richter, J. L. Ezzell, F. Hoefler, A. K.r. Mattulat, M. Scheutwinkel, T. Gobran, David S. Waddell, D. E. Knowles, Vikas KhuranaAbstract:Accelerated solvent extraction (ASE) applies temperature and pressure to accelerate extraction processes and improve the efficiency of solvent extraction. This paper reports on a study to compare the results obtained with Soxhlet to those obtained by ASE for various samples containing Polychlorinated dibenzo-p-dioxins (PCDDs) and Polychlorinated Dibenzofurans (PCDFs). Contaminated samples (soil, sediments, chimney brick, urban dust and fly ash) were extracted by ASE and Soxhlet. A review of the data indicates that ASE gives essentially equivalent data to Soxhlet extraction. However, ASE extractions are performed in less time and with less solvent (about 15 mL and less than 25 min for 10-g samples) than by the classical extraction techniques.
S Takada - One of the best experts on this subject based on the ideXlab platform.
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degradation of Polychlorinated dibenzo p dioxins and Polychlorinated Dibenzofurans by the white rot fungus phanerochaete sordida yk 624
Applied and Environmental Microbiology, 1996Co-Authors: S Takada, Takahiro Matsueda, R. Kondo, M Nakamura, K SakaiAbstract:A method for the degradation of dioxins by white rot fungi was developed. Degradation of a mixture of 10 kinds of tetra- to octachlorodibenzo-p-dioxins (Polychlorinated dibenzo-p-dioxins [PCDDs]) and tetra- to octachloroDibenzofurans (Polychlorinated Dibenzofurans [PCDFs]), which were chlorinated at 2-, 3-, 7-, and 8-positions of the molecules, by the white rot fungus Phanerochaete sordida YK-624 was studied in a stationary low-nitrogen medium. The percent degradation values of PCDDs and PCDFs were approximately 40 (tetra-chloro-) to 76% (hexachloro-) and 45 (tetrachloro-) to 70% (hexachloro-), respectively. Metabolites of 2,3,7,8-tetra- and octaCDD formed by P. sordida YK-624 included 4,5-dichlorocatechol and tetrachlorocatechol, respectively. These results suggest that white rot fungus is able to substantially degrade both PCDDs and PCDFs. This is the first report of the degradation of highly chlorinated PCDDs and PCDFs by a microorganism.
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Degradation of Polychlorinated Dibenzo-p-Dioxins and Polychlorinated Dibenzofurans by the White Rot Fungus
1996Co-Authors: Takahiro Matsueda, S Takada, R. Kondo, K Sakai, M Nakamura, Takahiko MatsuedaAbstract:dibenzo-p-dioxins and Polychlorinated Dibenzofurans by the white rot fungus Phanerochaete sordida YK-624
Bert Van Bavel - One of the best experts on this subject based on the ideXlab platform.
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Pressurised hot water/steam extraction of Polychlorinated Dibenzofurans and naphthalenes from industrial soil
The Analyst, 1999Co-Authors: Bert Van Bavel, Christoffer Rappe, Kari Hartonen, Marja-liisa RiekkolaAbstract:Unique solvent properties of water, which can be changed by adjusting the temperature, were fully exploited to extract low polarity organic pollutants from soil samples. Solubility enhancement of the non-polar compounds due to the temperature increase of water together with enhanced thermal desorption and compounds’ vapour pressures theoretically and in practice opens the way to extract this kind of compound with pure water. Pressurised hot water extraction (PHWE), here defined as both water and steam extraction, of spiked Polychlorinated Dibenzofurans (PCDFs) from sand was investigated under different conditions. Optimum extraction conditions for these hydrophobic compounds were found at temperatures between 300 °C and 350 °C. Most effective extraction took place in the gas phase at a pressure of 50 atm. With steam at 300 °C and 50 atm quantitative extraction (compared to Soxhlet extraction) of Polychlorinated naphthalenes from real industrial soil was achieved. Additionally, compared to the values obtained by an international laboratory comparison study, the toxicity of the soil, caused by PCDFs, was reduced at least 90% using PHWE. In most cases the RSD was less than 20%, which showed good repeatability of the whole analytical method including the PHWE step.
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Multivariate data analysis applied in a toxicokinetic study on Polychlorinated Dibenzofurans in liver and fat tissue of test animals
Chemometrics and Intelligent Laboratory Systems, 1992Co-Authors: Bert Van Bavel, Gunilla Lindström, Michael Sjöström, Helen H»kanssonAbstract:Abstract Van Bavel, B., Lindstrom, G., Sjostrom, M. and H»kansson, H., 1992. Multivariate data analysis applied in a toxicokinetic study on Polychlorinated Dibenzofurans in liver and fat tissue of test animals. Chemometrics and Intelligent Laboratory Systems , 14: 235–243. Multivariate data analysis was performed on a data set containing the measurements of a toxicokinetic study on Polychlorinated Dibenzofurans (PCDFs), a class of environmental priority pollutants. In the toxicokinetic study four different species (rat, hamster, guinea pig and mouse) were administered a low concentration dose of a mixture of nineteen PCDF congeners. The PCDF mixture was given at a non-toxic dose level for all species. The PCDF levels in liver and adipose tissue and several biological values were measured. The application of principal component analysis and partial least-squares (PLS) on the data showed a difference between control and exposed animals for rats and hamsters. This difference, which was reversible and caused no toxic responses in the animals, was related to vitamin A in the kidneys for both species and also to the hepatic 7-ethoxyresurofin- O -deethylase activity in the hamster. PLS adequately modelled the distribution of the administered PCDFs between liver and adipose tissue for the toxicological undisturbed rat, hamster and guinea pig. Also the distribution of isomers that were unsubstituted in positions 2,3,7,8 was modelled and predicted by the same species-specific models.
Marja-liisa Riekkola - One of the best experts on this subject based on the ideXlab platform.
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Pressurised hot water/steam extraction of Polychlorinated Dibenzofurans and naphthalenes from industrial soil
The Analyst, 1999Co-Authors: Bert Van Bavel, Christoffer Rappe, Kari Hartonen, Marja-liisa RiekkolaAbstract:Unique solvent properties of water, which can be changed by adjusting the temperature, were fully exploited to extract low polarity organic pollutants from soil samples. Solubility enhancement of the non-polar compounds due to the temperature increase of water together with enhanced thermal desorption and compounds’ vapour pressures theoretically and in practice opens the way to extract this kind of compound with pure water. Pressurised hot water extraction (PHWE), here defined as both water and steam extraction, of spiked Polychlorinated Dibenzofurans (PCDFs) from sand was investigated under different conditions. Optimum extraction conditions for these hydrophobic compounds were found at temperatures between 300 °C and 350 °C. Most effective extraction took place in the gas phase at a pressure of 50 atm. With steam at 300 °C and 50 atm quantitative extraction (compared to Soxhlet extraction) of Polychlorinated naphthalenes from real industrial soil was achieved. Additionally, compared to the values obtained by an international laboratory comparison study, the toxicity of the soil, caused by PCDFs, was reduced at least 90% using PHWE. In most cases the RSD was less than 20%, which showed good repeatability of the whole analytical method including the PHWE step.
