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https://www.readbyqxmd.com/read/28335995/assessment-of-dietary-exposure-to-organohalogen-contaminants-legacy-and-emerging-flame-retardants-in-a-norwegian-cohort
#1
Fuchao Xu, Joo-Hui Tay, Adrian Covaci, Juan Antonio Padilla-Sánchez, Eleni Papadopoulou, Line Småstuen Haug, Hugo Neels, Ulla Sellström, Cynthia A de Wit
Polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs), polybrominated diphenyl ethers (PBDEs), emerging halogenated flame retardants (EHFRs) and organophosphate flame retardants (PFRs) were detected in 24h duplicate diet samples from a Norwegian cohort (n=61), with concentrations ranging from <method limit of quantification (MLQ)-0.64ng/g ww, <MLQ-0.70ng/g ww, <MLQ-0.93ng/g ww, <MLQ-0.14ng/g ww, and <MLQ-150ng/g ww, respectively. All studied contaminants were detected in the duplicate diet samples with detection frequencies (DF) ranging from 1...
March 20, 2017: Environment International
https://www.readbyqxmd.com/read/28319100/metagenomic-discovery-of-polybrominated-diphenyl-ether-biosynthesis-by-marine-sponges
#2
Vinayak Agarwal, Jessica M Blanton, Sheila Podell, Arnaud Taton, Michelle A Schorn, Julia Busch, Zhenjian Lin, Eric W Schmidt, Paul R Jensen, Valerie J Paul, Jason S Biggs, James W Golden, Eric E Allen, Bradley S Moore
Naturally produced polybrominated diphenyl ethers (PBDEs) pervade the marine environment and structurally resemble toxic man-made brominated flame retardants. PBDEs bioaccumulate in marine animals and are likely transferred to the human food chain. However, the biogenic basis for PBDE production in one of their most prolific sources, marine sponges of the order Dysideidae, remains unidentified. Here, we report the discovery of PBDE biosynthetic gene clusters within sponge-microbiome-associated cyanobacterial endosymbionts through the use of an unbiased metagenome-mining approach...
March 20, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28306542/biomonitoring-of-danish-school-children-and-mothers-including-biomarkers-of-pbde-and-glyphosate
#3
Lisbeth E Knudsen, Pernille Winton Hansen, Seher Mizrak, Heidi K Hansen, Thit A Mørck, Flemming Nielsen, Volkert Siersma, Line Mathiesen
BACKGROUND: The Danish part of the large European Human biomonitoring pilot project Demonstration of a study to Coordinate and Perform Human biomonitoring on a European Scale (DEMOCOPHES) investigated the urine, hair and blood concentrations of 66 different environmental chemicals in a group of 145 Danish school children aged 6-11 years and their mothers from rural and urban areas in autumn 2011. Some - but not all - results were published; however, the concurrence of the chemicals has not been assessed...
March 17, 2017: Reviews on Environmental Health
https://www.readbyqxmd.com/read/28304169/temporal-evaluation-of-polybrominated-diphenyl-ether-pbde-serum-levels-in-middle-aged-and-older-california-women-2011-2015
#4
Susan Hurley, Debbie Goldberg, David O Nelson, Weihong Guo, Yunzhu Wang, Hyoung-Gee Baek, Junesoo Park, Myrto Petreas, Leslie Bernstein, Hoda Anton-Culver, Peggy Reynolds
In response to health concerns and widespread human exposures, two widely-used commercial formulations of polybrominated diphenyl ethers (PBDEs) were banned in the United States in 2005. Initial biomonitoring data have provided early indications of reduced human exposures since these bans took effect. Our objective was to evaluate temporal trends in PBDE serum levels among a population of older California women during a four-year period, beginning approximately five years after these formulations were banned...
March 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28299817/altered-expression-of-the-olr59-ethe1-and-slc10a2-genes-in-the-liver-of-f344-rats-by-neonatal-thyroid-hormone-disruption
#5
Kana Matsubara, Naoki Nakamura, Seigo Sanoh, Shigeru Ohta, Shigeyuki Kitamura, Naoto Uramaru, Shinichi Miyagawa, Taisen Iguchi, Nariaki Fujimoto
Many concerns have been expressed regarding the possible adverse effects of thyroid hormone-disrupting chemicals in the environment. The disruption of thyroid hormones in the neonatal period may lead to permanent effects on thyroid hormone homeostasis as well as related developmental disorders, as thyroid hormones are essential for regulating the growth and differentiation of many tissues. To understand the long-term alteration in gene expressions by neonatal administration of thyroid hormone-like chemicals in general, we identified genes whose expression was altered in the liver, an important component of the thyroid hormone axis, by neonatal exposure to triiodothyronine (T3)...
March 16, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28295735/halogen-bonding-interactions-of-polybrominated-diphenyl-ethers-and-thyroid-hormone-derivatives-a-potential-mechanism-for-inhibition-of-iodothyronine-deiodinase
#6
Eric S Marsan, Craig A Bayse
Polybrominated diphenyl ethers (PBDEs) increase flame resistance in consumer goods, but these compounds and their hydroxylated derivatives (OH-BDEs) impair normal thyroid function. Halogen bonding (XB) of PBDEs to an active site selenocysteine may competitively inhibit iodothyronine deiodinases (Dio) by blocking activation/deactivation of thyroid hormone (TH) derivatives. In this study, we compare the strength of the XB interactions of TH derivatives, iodine-based contrast agents and PBDEs/OH-BDEs to a methylselenolate model of the Dio active site using density functional theory...
March 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28293827/temporal-and-spatial-distributions-of-pbdes-in-atmosphere-at-shanghai-rural-regions-china
#7
Yun-Juan Zhu, Dan Sun, Nuo-Er Yang, Yong-Sheng Ding, Wei-Bing Feng, Wen-Jun Hong, Shi-Mao Zhu, Yi-Fan Li
Atmospheric samples were collected using polyurethane foam (PUF) passive air sampling device for every 3 months from June 2012 to May 2013 in Shanghai rural regions in order to investigate the concentrations, profiles, spatial distributions, and seasonal variations of polybrominated diphenyl ethers (PBDEs). Twelve PBDE congeners (BDE-17, BDE-28, BDE-47, BDE-49, BDE-66, BDE-85, BDE-99, BDE-100, BDE-138, BDE-153, BDE-154, and BDE-183) were measured and analyzed by GC-MS. The results showed that detectable PBDEs were examined in all air samples, which indicated that these pollutants are widespread in the research areas...
March 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28272363/correlation-between-prenatal-exposure-to-polybrominated-diphenyl-ethers-pbdes-and-infant-birth-outcomes-a-meta-analysis-and-an-experimental-study
#8
Xuemin Zhao, Shiqiao Peng, Yang Xiang, Yali Yang, Jing Li, Zhongyan Shan, Weiping Teng
Only a few epidemiological studies have focused on the correlation between prenatal exposure to polybrominated diphenyl ethers (PBDEs) and infant birth outcomes (IBO), and the results of these epidemiological studies are contradictory. The objective of this study was to assess the correlation between prenatal exposure to PBDEs (PEP) and IBO (i.e., birth weight) in an analysis of epidemiological studies and an experimental animals study. We searched databases of the medical literature (PubMed, Excerpta Medica Database, Cochrane Library, and China National Knowledge Infrastructure) for articles and pooled the results of the included epidemiological studies...
March 7, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28263530/environmental-assessment-of-pbdes-contamination-in-the-svitava-river-czech-republic
#9
Katerina Jarova, Alice Koleckarova, Zuzana Kralova, Milada Vavrova
OBJECTIVES: The aim of this study was to assess the contamination level of aquatic ecosystems of the Svitava River, situated in the South Moravian Region (Czech Republic), by residues of selected brominated flame retardants. We isolated and determined seven indicator PBDE congeners in samples of surface water and bottom sediments using optimized analytical methods. DESIGN: Samples were collected from eight locations along the river basin, particularly near the larger cities in order to assess their possible impact on the aquatic ecosystems...
December 18, 2016: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28258858/new-halogenated-flame-retardants-in-the-atmosphere-of-nine-urban-areas-in-china-pollution-characteristics-source-analysis-and-variation-trends
#10
Qilu Li, Kong Yang, Kechang Li, Xin Liu, Duohong Chen, Jun Li, Gan Zhang
Since the ban of polybrominated diphenyl ethers (PBDEs) excluding deca-BDE in China, new halogenated flame retardants (NHFRs), such as new brominated flame retardants and Dechlorane Plus, have become widely used. In this study, we assessed the atmospheric gaseous and particulate levels of eight NHFRs in nine urban areas in China. We detected high mean atmospheric (vapour plus particle phases) concentrations of tetrabromophthalate (TBPH) (74.8 pg m(-3)) and decabromodiphenyl ethane (DBDPE) (68.8 pg m(-3)), two major NHFRs...
February 28, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28254052/accumulation-of-polybrominated-diphenyl-ethers-in-breast-milk-of-women-from-an-e-waste-recycling-center-in-china
#11
Xinghong Li, Yuan Tian, Yun Zhang, Yujie Ben, Quanxia Lv
Polybrominated diphenyl ethers (PBDEs) can be transferred to infants through the ingestion of breast milk, resulting in potential health risk. In this study, PBDEs, hydroxylated polybrominated diphenyl ethers (OH-PBDEs) and 2,2',4,4',5,6'-hexachlorobiphenyl (CB-153) in human milk from women living adjacent to e-waste recycling sites of Wenling, China, were investigated. The median level of PBDEs in samples from residents living in the e-waste recycling environment >20years (R20 group, 19.5ng/g lipid weight (lw)) was significantly higher than that for residents living in Wenling <3years (R3 group, 3...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28245931/disruption-of-thyroid-hormone-th-levels-and-th-regulated-gene-expression-by-polybrominated-diphenyl-ethers-pbdes-polychlorinated-biphenyls-pcbs-and-hydroxylated-pcbs-in-e-waste-recycling-workers
#12
Jing Zheng, Chun-Tao He, She-Jun Chen, Xiao Yan, Mi-Na Guo, Mei-Huan Wang, Yun-Jiang Yu, Zhong-Yi Yang, Bi-Xian Mai
Polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) are the primary toxicants released by electronic waste (e-waste) recycling, but their adverse effects on people working in e-waste recycling or living near e-waste sites have not been studied well. In the present study, the serum concentrations of PBDEs, PCBs, and hydroxylated PCBs, the circulating levels of thyroid hormones (THs), and the mRNA levels of seven TH-regulated genes in peripheral blood leukocytes of e-waste recycling workers were analyzed...
February 25, 2017: Environment International
https://www.readbyqxmd.com/read/28242530/unintentional-production-of-persistent-chlorinated-and-brominated-organic-pollutants-during-iron-ore-sintering-processes
#13
Sumei Li, Guorui Liu, Minghui Zheng, Wenbin Liu, Jinhui Li, Mei Wang, Changliang Li, Yuan Chen
Iron ore sintering (SNT) processes are major sources of unintentionally produced chlorinated persistent organic pollutants (POPs), including polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs), polychlorinated biphenyls (PCBs), and polychlorinated naphthalenes (PCNs). However, few studies of emissions of brominated POPs, such as polybrominated dibenzo-p-dioxins/dibenzofurans (PBDD/Fs) and polybrominated diphenyl ethers (PBDEs), during SNT have been performed. Stack gas and fly ash samples from six typical SNT plants in China were collected and analyzed to determine the concentrations and profiles of PCDD/Fs, PCBs, PCNs, PBDD/Fs, and PBDEs, as well as any correlations among these compounds...
February 20, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28235828/independent-maternal-and-fetal-genetic-effects-on-mid-gestational-circulating-levels-of-environmental-pollutants
#14
Michela Traglia, Lisa A Croen, Kristen Lyall, Gayle C Windham, Marty Kharrazi, Gerald N DeLorenze, Anthony R Torres, Lauren A Weiss
Maternal exposure to environmental pollutants could affect fetal brain development and increase autism spectrum disorder (ASD) risk in conjunction with differential genetic susceptibility. Organohalogen congeners measured in maternal mid-pregnancy blood samples have recently shown significant, but negative associations with offspring ASD outcome. We report the first large scale maternal and fetal genetic study of the mid-pregnancy serum levels of a set of 21 organohalogens in a subset of 790 genotyped women and 764 children collected in California by the Early Markers for Autism (EMA) Project...
February 24, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28230353/statistical-survey-of-persistent-organic-pollutants-risk-estimations-to-humans-and-wildlife-through-consumption-of-fish-from-u-s-rivers
#15
Angela L Batt, John B Wathen, James M Lazorchak, Anthony R Olsen, Thomas M Kincaid
U.S. EPA conducted a national statistical survey of fish tissue contamination at 540 river sites (representing 82 954 river km) in 2008-2009, and analyzed samples for 50 persistent organic pollutants (POPs), including 21 PCB congeners, 8 PBDE congeners, and 21 organochlorine pesticides. The survey results were used to provide national estimates of contamination for these POPs. PCBs were the most abundant, being measured in 93.5% of samples. Summed concentrations of the 21 PCB congeners had a national weighted mean of 32...
February 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28217795/understanding-the-microscopic-binding-mechanism-of-hydroxylated-and-sulfated-polybrominated-diphenyl-ethers-with-transthyretin-by-molecular-docking-molecular-dynamics-simulations-and-binding-free-energy-calculations
#16
Huiming Cao, Yuzhen Sun, Ling Wang, Chunyan Zhao, Jianjie Fu, Aiqian Zhang
Polybrominated diphenyl ethers (PBDEs), one typical type of persistent environmental contaminant, have toxicological effects such as disrupting thyroid homeostasis in the human body. The high binding affinities of hydroxylated metabolites of PBDEs (OH-PBDEs) with transthyretin (TTR) were considered to be one major reason for their extraordinary capacity of passing through the blood-brain barrier via competitive thyroid hormone (T4) transport protein binding. Recent findings showed that sulfated PBDEs can be formed in human liver cytosol as phase-II metabolites...
February 20, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28214714/current-halogenated-flame-retardant-concentrations-in-serum-from-residents-of-shandong-province-china-and-temporal-changes-in-the-concentrations
#17
Yulong Ma, Peng Li, Jun Jin, Ying Wang, Qinghua Wang
The residents of Shandong Province, China, are exposed to high concentrations of halogenated flame retardants because large amounts of halogenated flame retardants are produced in the province. We determined the concentrations of eight polybrominated diphenyl ether congeners (PBDEs), seven novel brominated flame retardants (NBFRs), and the two dechlorane plus isomers (DPs) in serum from residents of Shandong Province. The aim was to identify temporal trends in the concentrations of these pollutants. The mean total concentrations of PBDEs, NBFRs and DPs were 41, 2...
May 2017: Environmental Research
https://www.readbyqxmd.com/read/28208015/tracing-the-biotransformation-of-pcbs-and-pbdes-in-common-carp-cyprinus-carpio-using-compound-specific-and-enantiomer-specific-stable-carbon-isotope-analysis
#18
Bin Tang, Xiao-Jun Luo, Yan-Hong Zeng, Bi-Xian Mai
Compound-specific and enantiomer-specific carbon isotope composition was investigated in terms of biotransformation of polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) as well as atropisomers of chiral PCB congeners in fish by exposing common carp (Cyprinus carpio) to certain PCB and PBDE congeners. The calculated carbon isotope enrichment factors (εC) for PCB 8, 18, and 45 were -1.99, -1.84, and -1.70‰, respectively, providing evidence of the metabolism of these congeners in fish...
February 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28190611/legacy-and-alternative-flame-retardants-in-norwegian-and-uk-indoor-environment-implications-of-human-exposure-via-dust-ingestion
#19
Katerina Kademoglou, Fuchao Xu, Juan Antonio Padilla-Sanchez, Line Småstuen Haug, Adrian Covaci, Chris D Collins
Indoor dust has been acknowledged as a major source of flame retardants (FRs) and dust ingestion is considered a major route of exposure for humans. In the present study, we investigated the presence of PBDEs and alternative FRs such as emerging halogenated FRs (EHFRs) and organophosphate flame retardants (PFRs) in indoor dust samples from British and Norwegian houses as well as British stores and offices. BDE209 was the most abundant PBDE congener with median concentrations of 4700ngg(-1) and 3400ngg(-1) in UK occupational and house dust, respectively, 30 and 20 fold higher than in Norwegian house dust...
February 9, 2017: Environment International
https://www.readbyqxmd.com/read/28189073/lower-levels-of-persistent-organic-pollutants-metals-and-the-marine-omega-3-fatty-acid-dha-in-farmed-compared-to-wild-atlantic-salmon-salmo-salar
#20
Anne-Katrine Lundebye, Erik-Jan Lock, Josef D Rasinger, Ole Jakob Nøstbakken, Rita Hannisdal, Egil Karlsbakk, Vidar Wennevik, Abdullah S Madhun, Lise Madsen, Ingvild Eide Graff, Robin Ørnsrud
Contaminants and fatty acid levels in farmed- versus wild Atlantic salmon have been a hot topic of debate in terms of food safety. The present study determined dioxins (polychlorinated dibenzo-p-dioxin and dibenzofuran), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs), organochlorine pesticides (OCPs), metals and fatty acids in wild and farmed Atlantic salmon. Contaminant levels of dioxins, PCBs, OCPs (DDT, dieldrin, lindane, chlordane, Mirex, and toxaphene), and mercury were higher in wild salmon than in farmed salmon, as were the concentrations of the essential elements selenium, copper, zinc and iron, and the marine omega-3 fatty acid docosahexaenoic acid (DHA)...
May 2017: Environmental Research
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