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https://www.readbyqxmd.com/read/28741109/multi-analyte-method-development-for-analysis-of-brominated-flame-retardants-bfrs-and-pbde-metabolites-in-human-serum
#1
Dasheng Lu, Yu'e Jin, Chao Feng, Dongli Wang, Yuanjie Lin, Xinlei Qiu, Qian Xu, Yimin Wen, Jianwen She, Guoquan Wang, Zhijun Zhou
Commonly, analytical methods measuring brominated flame retardants (BFRs) of different chemical polarities in human serum are labor consuming and tedious. Our study used acidified diatomaceous earth as solid-phase extraction (SPE) adsorbent and defatting material to simultaneously determine the most abundant BFRs and their metabolites with different polarities in human serum samples. The analytes include three types of commercial BFRs, tetrabromobisphenol A (TBBPA), hexabromocyclododecane (HBCD) isomers, and polybrominated biphenyl ethers (PBDEs), and dominant hydroxylated BDE (OH-PBDE) and methoxylated BDE (MeO-PBDE) metabolites of PBDEs...
July 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28736150/prenatal-environmental-chemical-exposures-and-longitudinal-patterns-of-child-neurobehavior
#2
Joseph M Braun, Kimberly Yolton, Shaina L Stacy, Bahar Erar, George D Papandonatos, David C Bellinger, Bruce P Lanphear, Aimin Chen
BACKGROUND: Prenatal chemical exposures may adversely affect neurodevelopment, but few studies have examined the persistence of these associations. We examined whether associations between prenatal bisphenol A (BPA) or polybrominated diphenyl ether (PBDE) exposures persist or resolve as children age. METHODS: We followed 346 mother-child pairs (enrolled 2003-2006) from Cincinnati, OH from pregnancy until children were 8 years old. We measured BPA in urine collected at 16 and 26 weeks gestation and PBDE-47 in serum collected at 16 weeks gestation...
July 20, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28734254/childhood-polybrominated-diphenyl-ether-pbde-exposure-and-neurobehavior-in-children-at-8-years
#3
Ann M Vuong, Kimberly Yolton, Changchun Xie, Glenys M Webster, Andreas Sjödin, Joseph M Braun, Kim N Dietrich, Bruce P Lanphear, Aimin Chen
BACKGROUND: Prenatal polybrominated diphenyl ether (PBDE) exposure has been associated with decrements in IQ and increased attention deficit/hyperactivity disorder related behaviors in children; however, data are limited for the role of postnatal exposures. OBJECTIVES: We investigated the association between a series of childhood PBDE concentrations and Full-Scale Intelligence Quotient (FSIQ) and externalizing problems at 8 years. METHODS: We used data from 208 children in the Health Outcomes and Measures of the Environment (HOME) Study, a prospective pregnancy and birth cohort...
July 19, 2017: Environmental Research
https://www.readbyqxmd.com/read/28734253/polybrominated-diphenyl-ether-flame-retardant-concentrations-in-faeces-from-young-children-in-queensland-australia-and-associations-with-environmental-and-behavioural-factors
#4
Karin English, Yiqin Chen, Leisa-Maree Toms, Paul Jagals, Robert S Ware, Jochen F Mueller, Peter D Sly
The aim of our study was to investigate children's exposure to the flame retardants polybrominated diphenyl ethers (PBDEs) by analysing faecal content, a non-invasive matrix, as well as responses to an exposure-assessment questionnaire. A convenience sample of 61 parents with children (aged >3 months to <2 years) completed an online pre-tested questionnaire and provided faecal samples for analysis by high resolution gas chromatography/mass spectrometry. BDE-209 was the dominant congener in faecal samples adjusted to 8...
July 19, 2017: Environmental Research
https://www.readbyqxmd.com/read/28734210/effects-analysis-of-substituent-characteristics-and-solvents-on-the-photodegradation-of-polybrominated-diphenyl-ethers
#5
Long Jiang, Youli Qiu, Yu Li
The ultraviolet spectra and electron transition information of 209 polybrominated diphenyl ethers (PBDEs) in gas were first calculated via time-dependent density functional theory using Gaussian 09 software. The main and second-order interactional effects of substituent characteristics on the photodegradation of PBDEs were then analysed using a full factorial experimental design. Solvent effects were considered to research the effect and promotion mechanism of solvent molecules on the photodegradation of PBDEs compared with that in gas...
July 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28732337/critical-review-of-soil-contamination-by-polybrominated-diphenyl-ethers-pbdes-and-novel-brominated-flame-retardants-nbfrs-concentrations-sources-and-congener-profiles
#6
REVIEW
Thomas J McGrath, Andrew S Ball, Bradley O Clarke
Polybrominated diphenyl ethers (PBDEs) have been used in a broad array of polymeric materials such as plastics, foams, resins and adhesives to inhibit the spread of fires since the 1970s. The widespread environmental contamination and well documented toxic effects of PBDEs have led to bans and voluntary withdrawals in many jurisdictions. Replacement novel brominated flame retardants (NBFRs) have, however, exhibited many of the same toxic characteristics as PBDEs and appear to share similar environmental fate...
July 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28724249/occurrence-and-source-apportionment-of-atmospheric-halogenated-flame-retardants-in-lhasa-city-in-the-tibetan-plateau-china
#7
Wan-Li Ma, Wen-Long Li, Zi-Feng Zhang, Li-Yan Liu, Wei-Wei Song, Chun-Yan Huo, Yi-Xing Yuan, Yi-Fan Li
Active air samples were collected in Lhasa, one of the highest cities in the world (3650m above sea level) located in the Tibetan Plateau, and were analyzed for 38 halogenated flame retardants (HFRs), including polybrominated diphenyl ethers (PBDEs), non-PBDE brominated flame retardants (NBFRs) and dechlorane plus (DPs). The median concentrations of PBDEs, NBFRs and DPs were 40, 23 and 0.21pg/m(3), respectively. Correlation analysis indicated the common source and/or similar environmental behavior for several HFRs...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28712647/perinatal-exposure-to-2-2-4-4-tetrabromodiphenyl-ether-induces-testicular-toxicity-in-adult-rats
#8
Ahmed Khalil, Mikhail Parker, Sarah E Brown, Sebnem E Cevik, Lian W Guo, Jake Jensen, Alexandra Olmsted, Daneal Portman, Haotian Wu, Alexander Suvorov
Since 1965, polybrominated diphenyl ethers (PBDEs) have been used internationally as flame-retardant additives. PBDEs were recently withdrawn from commerce in North America and Europe due to their environmental persistence, bioaccumulative properties and endocrine-disrupting effects. Generations exposed perinatally to the highest environmental doses of PBDE account for one-fifth of the total United States population. While, toxicity of PBDE for the male reproductive system has been demonstrated in several human and animal studies, the long-lasting effects of perinatal exposures on male reproduction are still poorly understood...
July 13, 2017: Toxicology
https://www.readbyqxmd.com/read/28702904/formation-of-brominated-and-chlorinated-dioxins-and-its-prevention-during-a-pilot-test-of-mechanochemical-treatment-of-pcb-and-pbde-contaminated-soil
#9
Mengnan Lu, Tianwu Lv, Ying Li, Zheng Peng, Giovanni Cagnetta, Shouxiang Sheng, Jun Huang, Gang Yu, Roland Weber
The destruction of persistent organic pollutants (POPs) is a large challenge in particular in developing and emerging economies. To date, a detailed assessment of non-combustion technologies with respect to formation of dioxins is lacking. In this study, an assessment of mechanochemical (MC) destruction technology for polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in contaminated soil remediation was conducted. Actual applied conditions of pilot-scale MC POPs destruction process indicates that the temperature increase inside the ball mills has the potential to form high levels of toxic polybrominated and polychlorinated dibenzo-p-dioxins and dibenzofurans (PXDD/Fs) when dioxin precursors are present...
July 12, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28701037/using-polyethylene-passive-samplers-to-study-the-partitioning-and-fluxes-of-pbdes-in-an-urban-river
#10
Mohammed A Khairy, Rainer Lohmann
In the aquatic environment, the behavior of hydrophobic organic contaminants (HOCs), such as polybrominated diphenyl ethers (PBDEs), depends on the congeners' physicochemical properties, environmental conditions and the presence of competing natural sorbents, including particulate and dissolved organic carbon (DOC) and black carbon (BC). Although BC is known as an important sedimentary sorbent for HOCs, its affinity for PBDEs has been poorly constrained. To better understand the biogeochemical controls on PBDEs, 12 PBDE congeners were measured in air, water, sediment and porewater of the lower Passaic River...
July 13, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28688304/dietary-exposure-assessment-of-chinese-population-to-tetrabromobisphenol-a-hexabromocyclododecane-and-decabrominated-diphenyl-ether-results-of-the-5th-chinese-total-diet-study
#11
Zhixiong Shi, Lei Zhang, Yunfeng Zhao, Zhiwei Sun, Xianqing Zhou, Jingguang Li, Yongning Wu
Based on the 5th Chinese Total Diet Study (TDS) carried out in 2011, the dietary exposure of Chinese population to three currently used brominated flame retardants (BFRs), tetrabromobisphenol A (TBBPA), hexabromocyclododecane (HBCD) and decabrominated diphenyl ether (BDE-209), was estimated and the related health risks were assessed. Levels of the three BFRs were determined in 80 composite samples from four animal-origin food groups. The average levels of BFRs in various food groups ranged from 0.671 to 5.76 ng/g lipid weight (lw)...
July 5, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28686898/prenatal-transfer-of-decabromodiphenyl-ether-bde-209-results-in-disruption-of-the-thyroid-system-and-developmental-toxicity-in-zebrafish-offspring
#12
Zhihua Han, Yufei Li, Shenghu Zhang, Ninghui Song, Huaizhou Xu, Yao Dang, Chunsheng Liu, John P Giesy, Hongxia Yu
Decabromodiphenyl ether (BDE-209) was one of most widely-used polybrominated diphenyl ether (PBDE) flame retardants and is frequently detected in both abiotic and biotic samples from environment. However, knowledge of its transgenerational risks is limited. Here, 4-month-old zebrafish were exposed to various concentrations of BDE-209 (0, 3, 30 or 300μg/L) for 28days and spawned in clean water without BDE-209. Concentrations of triiodothyronine (T3) and thyroxine (T4) as well as expressions of genes involved in the hypothalamic-pituitary-thyroid (HPT) axis were measured in offspring after exposure of adult zebrafish to BDE-209...
June 23, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28672702/spatial-distribution-and-implications-to-sources-of-halogenated-flame-retardants-in-riverine-sediments-of-taizhou-an-intense-e-waste-recycling-area-in-eastern-china
#13
Shanshan Zhou, Jie Fu, Huan He, Jianjie Fu, Qiaozhi Tang, Minfeng Dong, Yongqiang Pan, An Li, Weiping Liu, Limin Zhang
Concentrations and spatial distribution pattern of organohalogen flame retardants were investigated in the riverine surface sediments from Taizhou, an intensive e-waste recycling region in China. The analytes were syn- and anti- Dechlorane Plus (DP), Dechloranes 602, 603, and 604, a DP monoadduct, two dechlorinated DPs and 8 congeners of polybrominated diphenyl ethers (PBDEs). The concentrations of Σ8PBDEs, ΣDP, ΣDec600s, and ΣDP-degradates ranged from <100 to 172,000, 100 to 55,000, not detectable (nd) to 1600, and nd to 2800 pg/g dry weight, respectively...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28661659/human-exposure-to-legacy-and-emerging-halogenated-flame-retardants-via-inhalation-and-dust-ingestion-in-a-norwegian-cohort
#14
Joo Hui Tay, Ulla Sellström, Eleni Papadopoulou, Juan Antonio Padilla-Sánchez, Line Småstuen Haug, Cynthia A de Wit
In this study, we estimated human exposure to polybrominated diphenyl ethers (PBDEs), hexabromocyclododecanes (HBCDDs), and several emerging flame retardants (EFRs) via inhalation and dust ingestion. Sixty indoor stationary air samples, 13 personal air samples, and 60 settled dust samples were collected from a Norwegian cohort during winter 2013. PBDEs showed the highest median concentration in dust (1200 ng/g), followed by EFRs (730 ng/g) and HBCDDs (190 ng/g). The PBDE concentrations in dust were mainly driven by BDE-209 and those of EFRs by bis(2-ethylhexyl) tetrabromophthalate...
June 29, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28649046/transgenerational-endocrine-disruption-and-neurotoxicity-in-zebrafish-larvae-after-parental-exposure-to-binary-mixtures-of-decabromodiphenyl-ether-bde-209-and-lead
#15
Lianguo Chen, Xianfeng Wang, Xiaohua Zhang, Paul K S Lam, Yongyong Guo, James C W Lam, Bingsheng Zhou
Polybrominated diphenyl ethers (PBDEs) and heavy metals are two key groups of electric and electronic equipment contaminants. Despite their co-occurrence in aquatic environments, their combined effects remain largely unknown, particularly under a chronic exposure regime. In the present study, adult zebrafish (Danio rerio) were exposed to environmentally relevant concentrations of BDE-209 and lead (Pb), or their binary mixtures, for 3 months. After chronic parental exposure, increased transfer of BDE-209 and Pb to the offspring eggs was activated in the coexposure groups, with BDE-197 being the predominant PBDE congener, indicating the dynamic metabolism of BDE-209 in parental zebrafish...
June 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28644858/the-flame-retardant-de-71-a-mixture-of-polybrominated-diphenyl-ethers-inhibits-human-differentiated-thyroid-cell-function-in-vitro
#16
Thit Mynster Kronborg, Juliana Frohnert Hansen, Åse Krogh Rasmussen, Katrin Vorkamp, Claus Henrik Nielsen, Marie Frederiksen, Jacob Hofman-Bang, Christoffer Holst Hahn, Louise Ramhøj, Ulla Feldt-Rasmussen
BACKGROUND: Normal thyroid function is essential for general growth and metabolism, but can be affected by endocrine disrupting chemicals (EDCs). Polybrominated diphenyl ethers (PBDEs) have been used worldwide to reduce flammability in different materials and are suspected to be EDCs. The production of the commercial Penta- and OctaBDE mixtures is banned, but DecaBDEs and existing products may leak PBDEs into the environment. Our aim was to investigate the effect of the PentaBDE mixture DE-71 on human thyroid cells in vitro...
2017: PloS One
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
#17
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
#18
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
#19
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
#20
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 a 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
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