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https://www.readbyqxmd.com/read/28535063/airborne-precursors-predict-maternal-serum-perfluoroalkyl-acid-pfaa-concentrations
#1
Colleen M Makey, Thomas F Webster, Jonathan W Martin, Mahiba Shoeib, Tom Harner, Linda Dix-Cooper, Glenys M Webster
Human exposure to persistent perfluoroalkyl acids (PFAAs), including perfluorooctanoic acid (PFOA), perfluorononanoic acid (PFNA) and perfluorooctane sulfonate (PFOS), can occur directly from contaminated food, water, air and dust. However, precursors to PFAAs (PreFAAs), such as di-polyfluoroalkyl phosphates (diPAPs), fluorotelomer alcohols (FTOHs), perfluorooctyl sulfonamides (FOSAs), and sulfonamidoethanols (FOSEs) - which can be biotransformed to PFAAs - may also be a source of exposure. PFAAs were analyzed in 50 maternal sera collected in 2007-2008 from participants in Vancouver, Canada, while PFAAs and PreFAAs were measured in matching samples of residential bedroom air collected by passive sampler, and in sieved vacuum dust (< 150 μm)...
May 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28528505/enhanced-degradation-of-perfluorooctanoic-acid-using-dielectric-barrier-discharge-with-la-ce-doped-tio2
#2
Shanping Li, Xiaoping Wang, Lijun Liu, Yongbo Guo, Qinglin Mu, Abdelwahid Mellouki
A synergistic system of dielectric barrier discharge (DBD) combined with La/Ce-TiO2 was developed to investigate the decomposition performance of the environmentally persistent perfluorooctanoic acid (PFOA). The La/Ce-TiO2 was modified by sol-gel method and characterized by XRD, SEM, and energy dispersive X-ray. The effects of PFOA concentration, applied voltage, initial pH, liquid conductivity, and additives on the removal rate of PFOA were explored. The results showed that the La/Ce-TiO2 exhibited excellent catalytic effects on PFOA degradation in DBD system...
May 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28528261/perfluoroalkylated-acids-in-the-eggs-of-great-tits-parus-major-near-a-fluorochemical-plant-in-flanders-belgium
#3
Thimo Groffen, Ana Lopez-Antia, Wendy D'Hollander, Els Prinsen, Marcel Eens, Lieven Bervoets
Perfluoroalkyl acids (PFAAs) are highly persistent substances which have been detected in wildlife around the world, including birds. Although bird eggs have often been used to determine and monitor PFAAs levels in the marine environment, this has rarely been done in the terrestrial environment. In the present study we examined the concentrations and composition profile of 12 PFAAs (4 perfluoroalkyl sulfonic acids (PFSAs) and 8 perfluoroalkyl carboxylic acids (PFCAs) in the eggs of great tits (Parus major) collected at a fluorochemical plant and in three other areas, representing a gradient in distance from the pollution source (from 1 to 70 km), in Antwerp, Belgium...
May 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28528142/per-and-polyfluoroalkyl-substances-pfas-in-american-red-cross-adult-blood-donors-2000-2015
#4
Geary W Olsen, David C Mair, Cleston C Lange, Laura M Harrington, Timothy R Church, Corinne L Goldberg, Ross M Herron, Hank Hanna, John B Nobiletti, Jorge A Rios, William K Reagen, Carol A Ley
In 2015, thirteen per- and polyfluoroalkyl substances (PFAS), including perfluorohexanesulfonate (PFHxS), perfluorooctanesulfonate (PFOS), perfluorooctanoate (PFOA), perfluorononanoate (PFNA), and perfluorodecanoate (PFDA) were analyzed in human plasma that was collected from a total of 616 American Red Cross male and female blood donors (ages 20-69) at 6 regional blood collection centers. Plasma samples were analyzed using a validated solvent precipitation-isotope dilution direction-liquid chromatography tandem mass spectrometry method...
May 17, 2017: Environmental Research
https://www.readbyqxmd.com/read/28521193/issues-raised-by-the-reference-doses-for-perfluorooctane-sulfonate-and-perfluorooctanoic-acid
#5
Zhaomin Dong, Md Mezbaul Bahar, Joytishna Jit, Bruce Kennedy, Brian Priestly, Jack Ng, Dane Lamb, Yanju Liu, Luchun Duan, Ravi Naidu
On 25th May 2016, the U.S. EPA released reference doses (RfDs) for Perfluorooctane Sulfonate (PFOS) and Perfluorooctanoic Acid (PFOA) of 20ng/kg/day, which were much more conservative than previous values. These RfDs rely on the choices of animal point of departure (PoD) and the toxicokinetics (TK) model. At this stage, considering that the human evidence is not strong enough for RfD determination, using animal data may be appropriate but with more uncertainties. In this article, the uncertainties concerning RfDs from the choices of PoD and TK models are addressed...
May 15, 2017: Environment International
https://www.readbyqxmd.com/read/28513149/vertical-profiles-sources-and-transport-of-pfass-in-the-arctic-ocean
#6
Leo Wai-Yin Yeung, Clifton Dassuncao, Scott Andrew Mabury, Elsie M Sunderland, Xianming Zhang, Rainer Lohmann
The relative importance of atmospheric versus oceanic transport for poly- and perfluorinated alkyl substances (PFASs) reaching the Arctic Ocean is not well understood. Vertical profiles from the Central Arctic Ocean and shelf water, snow and meltwater samples were collected in 2012; 13 PFASs (C6-C12 PFCAs; C6, 8, 10 PFSAs; MeFOSAA and EtFOSAA, and FOSA) were routinely detected (range: <5 - 343 pg/L). PFASs were only detectable above 150 m depth in the polar mixed layer (PML) and halocline. Enhanced concentrations were observed in snow and meltpond samples, implying atmospheric deposition as an important source of PFASs...
May 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28511854/acot1-is-a-sensitive-indicator-for-ppar%C3%AE-activation-after-perfluorooctanoic-acid-exposure-in-primary-hepatocytes-of-sprague-dawley-rats
#7
Hui Liu, Jianshe Wang, Nan Sheng, Ruina Cui, Yitao Pan, Jiayin Dai
Perfluorooctanoic acid (PFOA) is one of the most commonly detected and persistent perfluoroalkyl substances (PFASs) found in the environment. We found that cell viability and intracellular oxidant stress increased in primary rat hepatocytes exposed to PFOA (100μM PFOA, 24h), and mitochondrial superoxide increased from 6.25μM PFOA treatment group. To screen for sensitive indicators in mRNA level, we investigated global transcriptome profile alteration after PFOA exposure using RNA-sequencing (RNA-seq) in primary rat hepatocytes, and identified 177 gene transcripts (158 upregulated, 19 downregulated) as significantly changed after exposure to 100μM of PFOA for 24h (fold change ≥2, FDR<0...
May 13, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28505513/polyfluoroalkyl-substance-exposure-in-the-mid-ohio-river-valley-1991-2012
#8
Robert L Herrick, Jeanette Buckholz, Frank M Biro, Antonia M Calafat, Xiaoyun Ye, Changchun Xie, Susan M Pinney
BACKGROUND: Industrial discharges of perfluorooctanoic acid (PFOA) to the Ohio River, contaminating water systems near Parkersburg, WV, were previously associated with nearby residents' serum PFOA concentrations above US general population medians. Ohio River PFOA concentrations downstream are elevated, suggesting Mid-Ohio River Valley residents are exposed through drinking water. OBJECTIVES: Quantify PFOA and 10 other per- and polyfluoroalkyl substances (PFAS) in Mid-Ohio River Valley resident sera collected between 1991 and 2013 and determine whether the Ohio River and Ohio River Aquifer are exposure sources...
May 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28488001/lateral-displacement-sulcus-angle-and-trochlear-angle-are-associated-with-early-patellofemoral-osteoarthritis-following-anterior-cruciate-ligament-reconstruction
#9
Erin M Macri, Adam G Culvenor, Hayden G Morris, Timothy S Whitehead, Trevor G Russell, Karim M Khan, Kay M Crossley
PURPOSE: Patellofemoral osteoarthritis (PFOA) occurs in approximately half of anterior cruciate ligament (ACL)-injured knees within 10-15 years of trauma. Risk factors for post-traumatic PFOA are poorly understood. Patellofemoral alignment and trochlear morphology may be associated with PFOA following ACL reconstruction (ACLR), and understanding these relationships, particularly early in the post-surgical time period, may guide effective early intervention strategies. In this study, patellofemoral alignment and trochlear morphology were investigated in relation to radiographic features of early PFOA 1-year post-ACLR...
May 9, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28486183/characterization-of-occurrence-sources-and-sinks-of-perfluoroalkyl-and-polyfluoroalkyl-substances-pfass-in-a-tropical-urban-catchment
#10
Huiting Chen, Martin Reinhard, Tung Viet Nguyen, Luhua You, Yiliang He, Karina Yew-Hoong Gin
Understanding the sources, occurrence and sinks of perfluoroalkyl and polyfluoroalkyl substances (PFASs) in the urban water cycle is important to protect and utilize local water resources. Concentrations of 22 target PFASs and general water quality parameters were determined monthly for a year in filtered water samples from five tributaries and three sampling stations of an urban water body. Of the 22 target PFASs, 17 PFASs were detected with a frequency >93% including PFCAs: C4-C12 perfluoroalkyl carboxylates, C4, C6, C8, and C10 perfluoroalkane sulfonates, perfluorooctane sulfonamides and perfluorooctane sulfonamide substances (FOSAMs), C10 perfluoroalkyl phosphonic acid (C10 PFPA), 6:2 fluorotelomer sulfonic acid (6:2 FTSA) and C8/C8 perfluoroalkyl phosphinic acid (C8/C8-PFPIA)...
May 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28472695/perfluoroalkyl-and-polyfluoroalkyl-substances-in-the-lower-atmosphere-and-surface-waters-of-the-chinese-bohai-sea-yellow-sea-and-yangtze-river-estuary
#11
Zhen Zhao, Jianhui Tang, Lijie Mi, Chongguo Tian, Guangcai Zhong, Gan Zhang, Shaorui Wang, Qilu Li, Ralf Ebinghaus, Zhiyong Xie, Hongwen Sun
Polyfluoroalkyl and perfluoroalkyl substances (PFASs), in the forms of neutral polyfluoroalkyl substances in the gas phase of air and ionic perfluoroalkyl substances in the dissolved phase of surface water, were investigated during a sampling campaign in the Bohai Sea, Yellow Sea, and Yangtze River estuary in May 2012. In the gas phase, the concentrations of neutral ∑PFASs were within the range of 76-551pg/m(3). Higher concentrations were observed in the South Yellow Sea. 8:2 fluorotelomer alcohol (FTOH) was the predominant compound as it accounted for 92%-95% of neutral ∑PFASs in all air samples...
May 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28440430/perfluorooctanoic-acid-induces-oxidative-damage-and-mitochondrial-dysfunction-in-pancreatic-%C3%AE-cells
#12
Kwang Sik Suh, Eun Mi Choi, Yu Jin Kim, Soo Min Hong, So Yong Park, Sang Youl Rhee, Seungjoon Oh, Sung Woon Kim, Youngmi Kim Pak, Wonchae Choe, Suk Chon
Several environmental contaminants have been linked to the development of diabetes and increased diabetes‑associated mortality. Perfluorooctanoic acid (PFOA) is a widely used perfluoroalkane found in surfactants and lubricants, and in processing aids used in the production of polymers. Furthermore, PFOA has been detected in humans, wildlife and the environment. The present study investigated the toxic effects of PFOA on rat pancreatic β‑cell‑derived RIN‑m5F cells. Cell viability, apoptosis, reactive oxygen and nitrogen species, cytokine release and mitochondrial parameters, including membrane potential collapse, reduced adenosine triphosphate levels, cardiolipin peroxidation and cytochrome c release were assessed...
June 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28434222/isomer-specific-transplacental-transfer-of-perfluoroalkyl-acids-results-from-a-survey-of-paired-maternal-cord-sera-and-placentas
#13
Fangfang Chen, Shanshan Yin, Barry C Kelly, Weiping Liu
Currently, information regarding isomer-specific concentrations of PFHxS, PFOS, and PFOA in human placenta, and corresponding placental-maternal ratios (RPM) of these compounds does not exist. The objective of the present study was to assess the occurrence, and distribution of different PFHxS, PFOS, and PFOA isomers in maternal serum, umbilical cord serum, and placenta to gain a better understanding of transplacental transport efficiency and prenatal exposure risks. The study involved quantitative determination of isomer-specific concentrations of PFHxS, PFOS, and PFOA in samples of maternal serum (n = 32), cord serum (n = 32), and placenta (n = 32) from pregnant women in Wuhan, China...
May 1, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28431976/the-impact-of-exposure-to-environmental-contaminant-on-hepatocellular-lipid-metabolism
#14
Zongguang Hui, Rujiang Li, Li Chen
Increasing evidences show that ubiquitous perfluorooctanoic acid (PFOA), a representative environmental pollutant, is found to be linked to lipid dysmetabolism. However, the biological mechanism behind this outcome remains uninvestigated. In the present study, we established the PFOA-injured liver in mice to explore the underlying mechanism associated with PFOA-induced lipid disturbance in the liver via a group of biochemical and molecular assays. As results, PFOA-exposed mice showed increased transaminase (ALT), reduced triglyceride and free fatty acid contents in serum, as well as elevated level of hepatic triglyceride...
April 18, 2017: Gene
https://www.readbyqxmd.com/read/28426990/concentration-of-perfluorinated-compounds-and-cotinine-in-human-foetal-organs-placenta-and-maternal-plasma
#15
Linn Salto Mamsen, Bo A G Jönsson, Christian H Lindh, Rasmus H Olesen, Agnete Larsen, Erik Ernst, Thomas W Kelsey, Claus Yding Andersen
BACKGROUND: Perfluoroalkyl substances (PFASs) are bio-accumulative pollutants, and prenatal exposure to PFASs is believed to impact human foetal development and may have long-term adverse health effects later in life. Additionally, maternal cigarette smoking may be associated with PFAS levels. Foetal exposure has previously been estimated from umbilical cord plasma, but the actual concentration in foetal organs has never been measured. OBJECTIVES: The concentrations of 5 PFASs and cotinine - the primary metabolite of nicotine - were measured in human foetuses, placentas, and maternal plasma to evaluate to what extent these compounds were transferred from mother to foetus and to determine if the PFAS concentrations were associated with maternal cigarette smoking...
April 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28418092/atmospheric-chlorinated-polyfluorinated-ether-sulfonate-and-ionic-perfluoroalkyl-acids-in-2006-to-2014-in-dalian-china
#16
Wei Liu, Hui Qin, Jingwen Li, Qian Zhang, Huanhuan Zhang, Zaoshi Wang, Xin He
Chlorinated polyfluorinated ether sulfonate (Cl-PFESA; trade name F-53B) is an alternative product for perfluorooctane sulfonate (PFOS) used in metal plating; little is known about its levels in the environment and its risks. To our knowledge, the present study constitutes the first report of Cl-PFESA in the atmosphere. In 2006 to 2014, C8 Cl-PFESA, along with ionic perfluoroalkyl acids (PFAAs), was detected in atmospheric particulate matter in Dalian, China. Concentrations of C8 Cl-PFESA increased from 140 pg/m(3) in 2007 to 722 pg/m(3) in 2014...
April 18, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28411540/mechanism-insight-of-pfoa-degradation-by-zno-assisted-photocatalytic-ozonation-efficiency-and-intermediates
#17
Dan Wu, Xukai Li, Yiming Tang, Ping Lu, Weirui Chen, Xiaoting Xu, Laisheng Li
Zinc oxide (ZnO) nanorods were prepared by a directly pyrolysis method and employed as catalyst for perfluorooctanoic acid (PFOA) degradation. Comparative experiments were conducted to discuss the catalytic activity and flexibility of ZnO. After ZnO addition, the best PFOA degradation efficiency (70.5%) was achieved by ZnO/UV/O3 system, only 9.5% by sole ozonation and 18.2% by UV254 light irradiation. PFOA degradation was sensitive with pH value and temperature. The better PFOA removal efficiency was achieved at acidic condition...
April 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28411449/prenatal-concentrations-of-perfluoroalkyl-substances-and-early-communication-development-in-british-girls
#18
Zuha Jeddy, Terryl J Hartman, Ethel V Taylor, Cayla Poteete, Katarzyna Kordas
Perfluoroalkyl substances (PFAS), found in many household products and classed as endocrine disrupting chemicals, can be transferred through the placenta and are associated with multiple developmental deficits in offspring. Using data from the Avon Longitudinal Study of Parents and Children (ALSPAC), we investigated the association between intrauterine exposure to PFAS and early communication development in 432 mother-daughter dyads at 15 and 38months of age. Concentrations of perfluorooctane sulfonate (PFOS), perfluorooctanoate (PFOA), perfluorohexane sulfonate (PFHxS), and perfluorononanoate (PFNA) were measured in maternal serum collected during pregnancy...
April 12, 2017: Early Human Development
https://www.readbyqxmd.com/read/28402547/perfluorododecanoic-acid-induces-cognitive-deficit-in-adult-rats
#19
Kohei Kawabata, Hirokazu Matsuzaki, Sahoko Nukui, Mari Okazaki, Ayako Sakai, Yoichi Kawashima, Naomi Kudo
The brain level of perfluorododecanoic acid (PFDoA) was compared with those of perfluorooctanoic acid (PFOA) and perfluorodecanoic acid (PFDA) in rats 9 days after a single oral dose (50 mg/kg). The PFDoA level in the brain was 44.0 ± 2.0 [mu]g/g, which was higher than that in the serum (24.4 ± 1.0 [mu]g/ml). By contrast, the concentrations of PFOA and PFDA in the brain were low (<0.8 and 4.7 ± 0.4 [mu]g/g, respectively), and less than one-tenth of those in the serum. Next, to investigate the effects on brain function, the cognitive function alterations of PFOA, PFDA, and PFDoA were estimated by the novel object recognition test 5-6 days after dosing...
April 11, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28401367/perfluoroalkyl-acids-pfaas-in-sediments-from-rivers-of-the-pearl-river-delta-southern-china
#20
Baolin Liu, Hong Zhang, Juying Li, Weihua Dong, Liuwei Xie
Having been largely used in industrial and household products, perfluoroalkyl acids (PFAAs) appear in environmental and biological systems with prevalence and persistence and have raised great concern in recent years. The present study is aimed at studying concentrations and composition profiles of 16 PFAAs in surface sediments collected from 51 sampling locations in 4 main rivers of the Pearl River Delta, one of the economy-developed areas in China. The total PFAA concentrations (∑ PFAAs) were determined in a wide range of 1...
May 2017: Environmental Monitoring and Assessment
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