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https://www.readbyqxmd.com/read/28636346/halogenated-flame-retardants-in-predator-and-prey-fish-from-the-laurentian-great-lakes-age-dependent-accumulation-and-trophic-transfer
#1
Guanyong Su, Robert J Letcher, Daryl McGoldrick, Sean M Backus
The identification, persistence, accumulation and trophic transfer of 25 polybrominated diphenyl ether (PBDE) congeners, 23 non-PBDE halogenated flame retardants (NPHFRs), 4 polybrominated-diphenoxybenzenes (PB-DiPhOBzs) and 6 methoxylated (MeO-) PB-DiPhOBzs were investigated in predator and prey fish collected in 2010 from sites in the North American Great Lakes of Ontario (n=26) and Erie (n=39). Regardless of locations or species, 20 PBDEs and 12 NPHFRs were quantifiable in at least one of the 65 analyzed samples, and polybrominated-1,4-diphenoxybenzenes (PB-DiPhOBzs) and MeO-PB-DiPhOBzs were not detectable in any of analyzed samples...
June 21, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28628864/polybrominated-diphenyl-ethers-pbdes-and-thyroid-hormones-in-cord-blood
#2
Guodong Ding, Jing Yu, Limei Chen, Caifeng Wang, Yijun Zhou, Yi Hu, Rong Shi, Yan Zhang, Chang Cui, Yu Gao, Ying Tian, Fang Liu
Human exposure to polybrominated diphenyl ethers (PBDEs) has been increasing over the last three decades in China and around the world. Animal studies suggest that PBDEs could reduce blood levels of thyroid hormones, but it is unclear whether PBDEs disrupt thyroid function in humans. We used data from a prospective birth cohort of 123 pregnant women who were enrolled between September 2010 and March 2011 in Shandong, China. We measured the concentrations of eight PBDE congeners (n = 106) and five thyroid hormones (n = 107) in cord serum samples...
June 16, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28627759/vibrational-biospectroscopy-characterises-biochemical-differences-between-cell-types-used-for-toxicological-investigations-and-identifies-alterations-induced-by-environmental-contaminants
#3
Kelly A Heys, Richard F Shore, M Glória Pereira, Francis L Martin
The use of cell-based assays is essential in reducing the number of vertebrates used in the investigation of chemical toxicities and in regulatory toxicology assessment. An important factor in obtaining meaningful results which can be accurately extrapolated is the use of biologically appropriate cell lines. In this preliminary study, ATR-FTIR spectroscopy with multivariate analysis was used to assess the fundamental biomolecular differences between a commonly used cell line, MCF-7 cells, and an environmentally relevant cell line derived from Mallard (Anas platyrhynchos) dermal fibroblasts...
June 19, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28618081/loss-of-the-ssra-genome-island-led-to-partial-debromination-in-the-pbde-respiring-dehalococcoides-mccartyi-strain-gy50
#4
Chang Ding, Matthew J Rogers, Kun-Lin Yang, Jianzhong He
Polybrominated diphenyl ethers (PBDEs), chemicals commonly used as flame-retardants in consumer products, are emerging persistent organic pollutants that are ubiquitous in the environment. In this study, we report the PBDE-respiring isolate - Dehalococcoides mccartyi strain GY50, which debrominates the most toxic tetra- and penta-BDE congeners (∼1.4 µM) to diphenyl ether within 12 days with hydrogen as the electron donor. The complete genome sequence revealed 26 reductive dehalogenase homologous genes (rdhAs), among which three genes (pbrA1, pbrA2, and pbrA3) were highly expressed during PBDE debromination...
June 15, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28605836/brominated-flame-retardants-in-marine-environment-focused-on-aquaculture-area-occurrence-source-and-bioaccumulation
#5
Seo-Yeon Gu, Kalu Ibe Ekpeghere, Hee-Young Kim, In-Seok Lee, Da-Hye Kim, Gyojin Choo, Jeong-Eun Oh
Brominated flame retardants (BFRs), including polybrominated diphenyl ethers (PBDEs), tetrabromobisphenol A (TBBPA), and hexabromocyclododecanes (HBCDs), were investigated in bivalve (i.e., oyster (Crassostrea gigas) and mussel (Mytilus coruscus)), sediment, and seawater samples collected from aquaculture areas in South Korea to identify their occurrence, sources, and bioaccumulation. Among the studied chemicals, HBCDs predominated in bivalves and sediment, with concentrations of ND-67.52ng/g lipid weight and 3...
June 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28604253/polybrominated-diphenyl-ethers-pbdes-in-u-s-meat-and-poultry-2012-2013-levels-trends-and-estimated-consumer-exposures
#6
Sara J Lupton, Heldur Hakk
Polybrominated diphenyl ethers (PBDEs) are a class of brominated flame retardants whose use has contaminated foods and caused subsequent human exposures. To address the issue of possible human exposure, samples from a 2012-13 U.S. meat and poultry (beef, pork, chicken, turkey) study were analyzed for seven PBDEs. The mean summed concentrations of the 7 BDE congeners (ΣPBDE) from beef, pork, chicken, and turkey were 0.40, 0.36, 0.19, and 0.76 ng/g lipid weight (lw). The range of ΣPBDEs for all meat classes was 0...
June 12, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28599595/polybrominated-diphenyl-ethers-flame-retardants-in-mother-infant-pairs-in-the-southeastern-u-s
#7
Paul Terry, Craig V Towers, Liang-Ying Liu, Angela A Peverly, Jiangang Chen, Amina Salamova
Polybrominated diphenyl ethers (PBDEs) are commonly used flame retardants in foams, building material, electronics, and textiles. These chemicals leach into the environment, where they persist, and are found today in virtually every population worldwide. Several studies in recent years have detected the presence of PBDEs in maternal and infant samples. However, few of these studies were conducted in the U.S., and few examined paired or matched mother blood-cord blood samples. We analyzed serum from 10 mother-infant pairs for the presence of PBDEs in a patient population in the Southeastern U...
June 9, 2017: International Journal of Environmental Health Research
https://www.readbyqxmd.com/read/28599194/spatiotemporal-patterns-and-relationships-among-the-diet-biochemistry-and-exposure-to-flame-retardants-in-an-apex-avian-predator-the-peregrine-falcon
#8
Kim J Fernie, Dominique Chabot, Louise Champoux, Samantha Brimble, Mehran Alaee, Sarah Marteinson, Da Chen, Vince Palace, David M Bird, Robert J Letcher
Flame retardants (FR) are industrial chemicals and some are proven environmental contaminants that accumulate in predatory birds. Few studies have examined the influence of diet on FR profiles in nestling raptors and the possible physiological implications of such FR exposure. The objectives of this research were (1) to determine spatial patterns of ≤ 48 polybrominated diphenyl ether (PBDE) congeners and ≤ 26 non-PBDE FRs, including organophosphate esters (OPEs), in nestling peregrine falcons (Falco peregrinus) across the Canadian Great Lakes-St...
June 6, 2017: Environmental Research
https://www.readbyqxmd.com/read/28593372/simultaneous-determination-of-dechloranes-polybrominated-diphenyl-ethers-and-novel-brominated-flame-retardants-in-food-and-serum
#9
Carlos Sales, Giulia Poma, Govindan Malarvannan, Tania Portolés, Joaquin Beltrán, Adrian Covaci
A sensitive method for the simultaneous quantification of dechloranes, polybrominated diphenyl ethers (PBDEs) and novel brominated flame retardants (NBFRs) has been developed for gas chromatography (GC) coupled to tandem mass spectrometry operating in electron capture negative ionization (ECNI) mode. The major advance has been achieved by combining selected ion monitoring (SIM) and multiple reaction monitoring (MRM) modes in well-defined time windows, to determine dechloranes, PBDEs and NBFRs at picogram per gram level in one single analysis in complex matrix biological samples...
June 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28593369/miniaturised-sample-preparation-method-for-the-multiresidual-determination-of-regulated-organohalogenated-pollutants-and-related-compounds-in-wild-bird-eggs
#10
Jose L Roscales, Alba Vicente, Lourdes Ramos, Begoña Jiménez
A simplified, miniaturised matrix solid-phase dispersion (MSPD)-based method allowing the simultaneous extraction and purification of contaminants belonging to selected families of regulated persistent organic pollutants (POPs), i.e. polychlorinated biphenyls (PCBs), organochlorine pesticides (OCPs) and penta- to octa-polybrominated diphenyl ethers (PBDEs), and related contaminants of emerging concern, such as deca-BDE and Dechlorane Plus (DP), has been proposed. Wild bird eggs were used as biotic fat-containing model matrices...
June 7, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28572024/maternal-exposure-to-polybrominated-diphenyl-ether-bde-209-during-lactation-affects-germ-cell-survival-with-altered-testicular-glucose-homeostasis-and-oxidative-status-through-down-regulation-of-cx43-and-p27kip1-in-prepubertal-mice-offspring
#11
Debarshi Sarkar, Shio Kumar Singh
BDE-209, a congener of polybrominated diphenyl ethers (PBDEs), is mainly used as flame retardant and accounts for over 82% of total PBDE usage. PBDEs have recently been detected in human milk and cord blood. BDE-209 possesses weak estrogenic/anti-estrogenic properties and evokes hyperglycemia through impaired glucose homeostasis in rat liver. However, little is known of the effect of lactational exposure to BDE-209 on germ cell survival in relation to testicular glucose homeostasis, estradiol and oxidative status during prepubertal period...
May 29, 2017: Toxicology
https://www.readbyqxmd.com/read/28559121/calpain-2-p35-p25-cdk5-pathway-is-involved-in-the-neuronal-apoptosis-induced-by-polybrominated-diphenyl-ether-153
#12
Hongmei Zhang, Lijun Chang, Huajun Zhang, Jisheng Nie, Zhihong Zhang, Xiaorong Yang, Ann M Vuong, Zemin Wang, Aimin Chen, Qiao Niu
Polybrominated diphenyl ethers (PBDEs) have been demonstrated to induce neurotoxicity in experimental rats and mice, with neuronal apoptosis as one of the major mechanisms, however, the mechanisms underlying PBDEs-induced neuronal apoptosis remain unclear. In this study, we aimed to investigate the role of calpain/p35-p25/Cdk5 pathway in BDE-153-induced neuronal apoptosis in the hippocampus and primary neurons in rats. Results showed that compared to the controls, neuronal apoptosis was significantly increased in vivo and ex vivo, as manifested by the increased hippocampus TUNEL-positive cell rates, apoptotic neurons in Hoechst and AO/EB staining, and the increased LDH activity and percentage of Annexin V-positive cells in rat hippocampus and primary neurons...
May 27, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28557710/a-case-control-study-of-maternal-polybrominated-diphenyl-ether-pbde-exposure-and-cryptorchidism-in-canadian-populations
#13
Cynthia G Goodyer, Shirley Poon, Katarina Aleksa, Laura Hou, Veronica Atehortua, Amanda Carnevale, Roman Jednak, Sherif Emil, Darius Bagli, Sumit Dave, Barbara F Hales, Jonathan Chevrier
BACKGROUND: Polybrominated diphenyl ethers (PBDEs) are flame retardants found in North American household products during the past four decades. These chemicals leach out in dust as products age, exposing individuals daily through inhalation and ingestion. Animal studies suggest that PBDEs disrupt sex hormones and adversely affect development of the reproductive system. OBJECTIVES: In the present study, we examined whether there is a link between maternal hair PBDE concentrations and the risk of cryptorchidism (undescended testes) in male infants; testis descent is known to be dependent on androgens...
May 26, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28545000/occurrence-and-effects-of-plastic-additives-on-marine-environments-and-organisms-a-review
#14
REVIEW
Ludovic Hermabessiere, Alexandre Dehaut, Ika Paul-Pont, Camille Lacroix, Ronan Jezequel, Philippe Soudant, Guillaume Duflos
Plastics debris, especially microplastics, have been found worldwide in all marine compartments. Much research has been carried out on adsorbed pollutants on plastic pieces and hydrophobic organic compounds (HOC) associated with microplastics. However, only a few studies have focused on plastic additives. These chemicals are incorporated into plastics from which they can leach out as most of them are not chemically bound. As a consequence of plastic accumulation and fragmentation in oceans, plastic additives could represent an increasing ecotoxicological risk for marine organisms...
May 16, 2017: Chemosphere
https://www.readbyqxmd.com/read/28528419/a-risk-based-characterization-of-sediment-contamination-by-legacy-and-emergent-contaminants-of-concern-in-coastal-british-columbia-canada
#15
Carmen Morales-Caselles, Jean-Pierre W Desforges, Neil Dangerfield, Peter S Ross
Sediments have long been used to help describe pollution sources, contaminated sites, trends over time, and habitat quality for marine life. We collected surficial sediments from 12 sites at an average seawater depth of 25 m in three near-urban areas of the Salish Sea (British Columbia, Canada) to investigate habitat quality for marine life, including heavily contaminated killer whales. Samples were analyzed using high-resolution instrumentation for a wide variety of congeners of polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs), hexabromocyclododecane (HBCDD), polybrominated biphenyls, polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans, organochlorine pesticides, and polychlorinated naphthalenes (PCNs)...
May 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28528407/effects-of-feeding-strategy-sediment-characteristics-and-chemical-properties-on-polychlorinated-biphenyl-and-polybrominated-diphenyl-ether-bioaccumulation-from-marine-sediments-in-two-invertebrates
#16
H Frouin, P Jackman, N D Dangerfield, P S Ross
Shellfish and sediment invertebrates have been widely used to assess pollution trends over space and time in coastal environments around the world. However, few studies have compared the bioaccumulation potential of different test species over a range of sediment-contaminant concentrations and profiles. The bioavailability of sediment-related contaminants was evaluated using sediments collected from sites (n = 12) throughout the Salish Sea, British Columbia, Canada. Two benthic marine invertebrates-the Baltic clam Macoma balthica and the polychaete worm Neanthes arenaceodentata-were exposed for 28 days in a controlled environment to these field-collected coastal sediments...
May 20, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28528316/bioindication-of-pbdes-and-pcbs-by-native-and-transplanted-moss-pleurozium-schreberi
#17
Grzegorz Kosior, Petra Přibylová, Lenka Vaňková, Petr Kukučka, Ondřej Audy, Jana Klánová, Aleksandra Samecka-Cymerman, Lucyna Mróz, Alexander J Kempers
PBDEs and PCBs are toxic, persistent organic pollutants (POPs), and the use of PCBs is forbidden, but they are still present in many environments and biota. 90-day assays were conducted with the moss Pleurozium schreberi transplanted from an uncontaminated control site to ten sites (rural and urban) selected in one of the most polluted regions of Upper Silesia in Poland. Native P. schreberi mosses were collected from the same ten polluted sites. Concentrations of PBDEs (28, 47, 66, 85, 99, 100, 153, 154, 183 and 209) and PCBs (28, 52, 101, 118, 138, 153, 180) were determined in all native and transplanted P...
May 18, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28512710/effects-of-coexisting-bde-47-on-the-migration-and-biodegradation-of-bde-99-in-river-based-aquifer-media-recharged-with-reclaimed-water
#18
Y Yan, Y Li, M Ma, W Ma, X Cheng, K Xu
Two prominent polybrominated diphenyl ether (PBDE) congeners have been included in the persistent organic pollutant list, 2,2',4,4',5-tetrabromodiphenyl ether (BDE-99) and 2,2,4,4'-tetrabromodiphenyl ether (BDE-47), which have been detected in treated municipal wastewater, river water, and sediments in China. A lab-scale column experiment was established to investigate the effects of the competitive sorption of BDE-47 on BDE-99 biodegradation and migration in two types of river-based aquifer soils during groundwater recharge with reclaimed water...
May 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28511039/occurrence-composition-source-and-regional-distribution-of-halogenated-flame-retardants-and-polybrominated-dibenzo-p-dioxin-dibenzofuran-in-the-soils-of-guiyu-china
#19
Pengjun Xu, Bu Tao, Zhiguang Zhou, Shuang Fan, Ting Zhang, Aimin Liu, Shuping Dong, Jingli Yuan, Hong Li, Jiping Chen, Yeru Huang
Guiyu, China, is well-known for the crude disposal of electronic waste (EW) and severe persistent organic pollutants (POPs). Therefore, in this study, the occurrence, composition, and source of polybrominated diphenyl ethers (PBDEs), 2,2',4,4',5,5'-hexabromobiphenyl (BB153), some novel brominated flame retardants (NBFRs), Dechlorane Plus (DP) and polybrominated dibenzo-p-dioxins/dibenzofurans (PBDD/Fs) in farmland soils covering Guiyu were studied. In EW disposal area soils, PBDEs were the most abundant FRs, with concentrations of 13-1014 ng g(-1)...
May 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28502627/distribution-of-pbdes-hbcds-and-pcbs-in-the-brisbane-river-estuary-sediment
#20
Alfred K Anim, Daniel S Drage, Ashantha Goonetilleke, Jochen F Mueller, Godwin A Ayoko
To date, very little or no data exist in literature for some brominated flame retardants (BFRs) and polychlorinated biphenyls in Queensland sediments. These pollutants were measured in the sediments along the Brisbane River estuary. The target compounds were regularly detected in measurable concentrations: PBDEs=33.3-97.8% (n=45), PCBs=94.1-100% (n=51) and HBCDs=79-98% (n=48). Consistently, >90% of the observed ∑8PBDE concentration was attributed to BDE-209. Mean PBDE levels (ng/g dry wt.) were: 4.4±3...
May 11, 2017: Marine Pollution Bulletin
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