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https://www.readbyqxmd.com/read/29139609/development-of-a-high-throughput-method-based-on-thin-film-microextraction-using-a-96-well-plate-system-with-a-cork-coating-for-the-extraction-of-emerging-contaminants-in-river-water-samples
#1
Lucas Morés, Adriana Neves Dias, Eduardo Carasek
In this study, a new method was developed in which a biosorbent material is used as the extractor phase in conjunction with a recently described sample preparation technique called thin-film microextraction and a 96-well plate system. The method was applied to the determination of emerging contaminants, such as 3-(4-methylbenzylidene) camphor, ethylparaben, triclocarban and bisphenol A, in water samples. The separation and detection of the analytes were performed by high-performance liquid chromatography with diode array detection...
November 15, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/29137705/novel-approach-to-high-throughput-determination-of-endocrine-disruptors-using-recycled-diatomaceous-earth-as-a-green-sorbent-phase-for-thin-film-solid-phase-microextraction-combined-with-96-well-plate-system
#2
Nicolas Kirschner, Adriana Neves Dias, Dilma Budziak, Cristian Berto da Silveira, Josias Merib, Eduardo Carasek
A sustainable approach to TF-SPME is presented using recycled diatomaceous earth, obtained from a beer purification process, as a green sorbent phase for the determination of bisphenol A (BPA), benzophenone (BzP), triclocarban (TCC), 4-methylbenzylidene camphor (4-MBC) and 2-ethylhexyl-p-methoxycinnamate (EHMC) in environmental water samples. TF-SPME was combined with a 96-well plate system allowing for high-throughput analysis due to the simultaneous extraction/desorption up to 96 samples. The proposed sorbent phase exhibited good stability in organic solvents, as well as satisfactory analytical performance...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29136846/determination-of-bisphenols-with-estrogenic-activity-in-plastic-packaged-baby-food-samples-using-solid-liquid-extraction-and-clean-up-with-dispersive-sorbents-followed-by-gas-chromatography-tandem-mass-spectrometry-analysis
#3
M T García-Córcoles, M Cipa, R Rodríguez-Gómez, A Rivas, F Olea-Serrano, J L Vílchez, A Zafra-Gómez
Bisphenols (BPs) are a family of chemicals with known endocrine disrupting activity. Bisphenol A (BPA) is the most representative prototype of this group of chemicals. Recently, the use of BPA, a prototype of endocrine disruptors, has been reduced and replaced with structural analogs due to its negative effects on both the environment and consumers. In this work, a new method is presented for the determination of seven BPs, with estrogenic activity in ready-to-eat plastic packaged baby foods. The procedure involves the isolation of the analytes using solid-liquid phase extraction with acetonitrile followed by a clean-up step with a mixture of dispersive-SPE sorbents (C18 and PSA) and magnesium sulphate, to reduce matrix effect from proteins, sugars and lipids...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136804/an-on-line-coupling-of-nanofibrous-extraction-with-column-switching-high-performance-liquid-chromatography-a-case-study-on-the-determination-of-bisphenol-a-in-environmental-water-samples
#4
Martina Háková, Lucie Chocholoušová Havlíková, Jiří Chvojka, Petr Solich, Dalibor Šatínský
Polyamide 6 nanofiber polymers were used as modern sorbents for on-line solid phase extraction (SPE) coupled with liquid chromatography. The on-line SPE system was tested for the determination of bisphenol A in river water samples. Polyamide nanofibers were prepared using needleless electrospinning, inserted into a mini-column cartridge (5 × 4.6mm) and coupled with HPLC. The effect of column packing and the amount of polyamide 6 on extraction efficiency was tested and the packing process was optimized. The proposed method was performed using a 50-µL sample injection followed by an on-line nanofibrous extraction procedure...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29132025/micro-quechers-extraction-coupled-to-gc-ms-for-a-fast-determination-of-bisphenol-a-in-human-urine
#5
Luísa Correia-Sá, Sónia Norberto, Cristina Delerue-Matos, Conceição Calhau, Valentina F Domingues
Bisphenol A (BPA) is considered an endocrine disruptor and public concern over BPA exposure has been raised. Several studies have assessed human exposure to this plasticizer, confirming its ubiquitous presence and highlighting children as a public of special concern. A simple, efficient, cheap and green analytical procedure is reported within this paper. This paper reports, for the first time, the development of a modified Micro-QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) method coupled to gas chromatography-mass spectrometry (GC-MS) as a new strategy for the efficient extraction and determination of Bisphenol A in human urine samples...
November 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29129240/maternal-methyl-donor-supplementation-during-gestation-counteracts-bisphenol-a-induced-oxidative-stress-in-sows-and-offspring
#6
Daolin Mou, Jun Wang, Hong Liu, Yuling Chen, Lianqiang Che, Zhengfeng Fang, Shengyu Xu, Yan Lin, Bin Feng, Jian Li, De Wu
OBJECTIVE: Maternal oxidative stress is harmful for embryonic, fetal, and placental development. The aim of this study was to investigate whether methyl donor supplementation during gestation effectively ameliorates maternal and placenta oxidative stress up to offspring. METHODS: Fifty-six Landrace × Yorkshire sows were randomly allocated to receive one of the following four diets during gestation: control diet (CON); control diet supplemented with methyl donor (MET); control diet supplemented with bisphenol A (BPA); and control diet supplemented with BPA and MET (BPA + MET)...
January 2018: Nutrition
https://www.readbyqxmd.com/read/29129061/a-highly-sensitive-and-high-throughput-method-for-the-analysis-of-bisphenol-analogues-and-their-halogenated-derivatives-in-breast-milk
#7
Yumin Niu, Bin Wang, Yunfeng Zhao, Jing Zhang, Bing Shao
The structural analogs of bisphenol A (BPA) and their halogenated derivatives (together referred as BPs) have been found in environment, food and even human. Limited research showed that some of them exhibited similar to or even greater toxicities than BPA. Therefore, adverse effects on humans with low-dose in early life exposure were expected for BPs. Breast milk is an excellent matrix could reflect fetus and babies exposure to contaminants. Some of the emerging BPs may present with trace or ultra-trace levels in human...
November 13, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29128640/binding-interactions-of-halogenated-bisphenol-a-with-mouse-ppar%C3%AE-in-vitro-investigation-and-molecular-dynamics-simulation
#8
Jie Zhang, Tiezhu Li, Tuoyi Wang, Tianzhu Guan, Hansong Yu, Zhuolin Li, Yongzhi Wang, Yongjun Wang, Tiehua Zhang
The binding of bisphenol A (BPA) and its halogenated derivatives (halogenated BPAs) to mouse peroxisome proliferator-activated receptor α ligand binding domain (mPPARα-LBD) was examined by a combination of in vitro investigation and in silico simulation. Fluorescence polarization (FP) assay showed that halogenated BPAs could bind to mPPARα-LBD* as the affinity ligands. The calculated electrostatic potential (ESP) illustrated the different charge distributions of halogenated BPAs with altered halogenation patterns...
November 8, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/29128613/submicromolar-bisphenol-a-induces-proliferation-and-dna-damage-in-human-hepatocyte-cell-lines-in-vitro-and-in-juvenile-rats-in-vivo
#9
Seoyoung Kim, Gilim Mun, Eun Choi, Minjeong Kim, Ji Seong Jeong, Keon Wook Kang, Sunha Jee, Kyung-Min Lim, Yun-Sil Lee
An association between bisphenol A (BPA) exposure and hepatic tumors was suggested, but the employment of high-dose levels raises questions about its relevance to human health. Here, we demonstrate that submicromolar concentrations of BPA induce the proliferation and DNA damage in human hepatocyte cell lines. In HepG2 and NKNT-3, undifferentiated and differentiated hepatocyte cell lines, respectively, submicromolar BPA concentrations promoted the cell proliferation, as indicated by enhanced DNA synthesis and elevated expression of cell-cycle proteins...
November 8, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29128559/preliminary-ecotoxicity-hazard-evaluation-of-dopo-hq-as-a-potential-alternative-to-halogenated-flame-retardants
#10
Min Liu, Haowen Yin, Xiaoqian Chen, Jing Yang, Yihuai Liang, Jingji Zhang, Fan Yang, Yunyun Deng, Shen Lu
Recent regulatory and environmental pressures have led to increasing demands for environmentally friendly flame retardants as alternatives to halogenated flame retardants (HFRs). A new flame retardant alternative, 10-(2, 5-dihydroxyl phenyl)-9, 10-dihydro-9-oxa-10- phosphaphenanthrene-10-oxide (DOPO-HQ), was applied due to its high thermal stability and glass transition temperature. However, there is little information available for its ecotoxicology. For this purpose, the preliminary ecotoxicity of DOPO-HQ was investigated and evaluated, using aquatic, terrestrial and microorganism toxicity according to Organization for Economic Co-operation and Development (OECD) guidelines under the framework of the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH) regulation...
November 1, 2017: Chemosphere
https://www.readbyqxmd.com/read/29127800/regulation-of-chemicals-in-children-s-products-how-u-s-and-eu-regulation-impacts-small-markets
#11
Maya Negev, Tamar Berman, Shay Reicher, Simona Balan, Anna Soehl, Shula Goulden, Ruti Ardi, Yaniv Shammai, Laura Hadar, Arlene Blum, Miriam L Diamond
Toys and children's products may contain trace metals and organic compounds that are potentially harmful to the health and development of infants and young children. Intergovernmental organizations and individual countries regulate chemicals in consumer products, but a coordinated international approach is lacking. This paper examines the implications of chemical regulation in children's products in large markets for a smaller market, namely Israel. We compared chemical regulations in children's products in the U...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29127374/prediction-of-human-prenatal-exposure-to-bisphenol-a-and-bisphenol-a-glucuronide-from-an-ovine-semi-physiological-toxicokinetic-model
#12
Glenn Gauderat, Nicole Picard-Hagen, Pierre-Louis Toutain, Rémi Servien, Catherine Viguié, Sylvie Puel, Marlène Z Lacroix, Tanguy Corbel, Alain Bousquet-Melou, Véronique Gayrard
Bisphenol A (BPA) risk assessment is hampered by the difficulty of determining the extent of internal exposure in the human fetus and uncertainties regarding BPA toxicokinetics (TK) in the maternal-fetal unit. A feto-maternal TK model describing BPA and BPA glucuronide (BPAG) disposition in sheep was humanized, using human TK data obtained after d6-BPA administration on a cookie, to predict BPA and BPAG kinetics in the human mother-fetus unit. Validation of the model predictions included the assessed dose proportionality of BPA and BPAG disposition and the similarity between the simulated and measured time courses of BPA and BPAG in fetal rhesus monkeys after BPA maternal dosing...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29126515/endocrine-disruptors-eds-and-hormone-dependent-cancers-correlation-or-causal-relationship
#13
Henri Rochefort
The selective increase in the incidence of hormone-dependent cancers (breast, prostate, testicular) in industrialized countries is associated with the increasing number of endocrine disruptors (EDs) in the environment and raises questions about the role of EDs in mammary carcinogenesis. Answering these questions is difficult because the number of EDs is large and varies with time. Moreover hormonal carcinogenesis is multifactorial and progresses slowly and in stages. This discussion will be limited to breast cancer and three EDs: distilbene, bisphenol A (BPA), and dichlorodiphenyltrichloroethane (DDT)...
September 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29121558/high-performance-and-versatile-electrochemical-aptasensor-based-on-self-supported-nanoporous-gold-microelectrode-and-enzyme-induced-signal-amplification
#14
Lei Shi, Xiaojiao Rong, Yan Wang, Shiming Ding, Wanying Tang
Herein, novel and versatile electrochemical aptasensors were constructed on a self-supported nanoporous gold (np-Au) microelectrode, integrating with an exonuclease III (Exo III) induced signal amplification strategy. Self-supported np-Au microelectrode with 3D bicontinuous nanoporous structures possesses tremendously large specific area, clean surface, high stability and biocompatibility, bringing about significant advantages in both molecular recognition and signal response. As paradigms, two analytes of bisphenol A (BPA) and ochratoxin A (OTA) were selected to demonstrate the superiority and versatility of designed aptasensors...
November 6, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29120796/a-rapid-and-simple-hplc-fld-screening-method-with-quechers-as-the-sample-treatment-for-the-simultaneous-monitoring-of-nine-bisphenols-in-milk
#15
Lin Xiong, Ping Yan, Min Chu, Ya-Qin Gao, Wei-Hong Li, Xiao-Ling Yang
A specific, precise and accurate high performance liquid chromatographic (HPLC) analytical method with a fluorescence detector (FLD) was established for the simultaneous determination of nine bisphenols (BPs) in milk samples. Samples were extracted ultrasonically with acetonitrile and cleaned using the QuEChERS technique. Under the optimized conditions, good linearity was obtained for the nine BPs and the correlation coefficients (R(2)) ranged from 0.9942 to 0.9997. Recovery values for the nine bisphenols in spiked samples were 75...
April 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29119411/systematic-assessment-of-research-on-autism-spectrum-disorder-asd-and-mercury-reveals-conflicts-of-interest-and-the-need-for-transparency-in-autism-research
#16
Janet K Kern, David A Geier, Richard C Deth, Lisa K Sykes, Brian S Hooker, James M Love, Geir Bjørklund, Carmen G Chaigneau, Boyd E Haley, Mark R Geier
Historically, entities with a vested interest in a product that critics have suggested is harmful have consistently used research to back their claims that the product is safe. Prominent examples are: tobacco, lead, bisphenol A, and atrazine. Research literature indicates that about 80-90% of studies with industry affiliation found no harm from the product, while only about 10-20% of studies without industry affiliation found no harm. In parallel to other historical debates, recent studies examining a possible relationship between mercury (Hg) exposure and autism spectrum disorder (ASD) show a similar dichotomy...
November 8, 2017: Science and Engineering Ethics
https://www.readbyqxmd.com/read/29115172/ecotoxicological-effects-of-bisphenol-a-and-nonylphenol-on-the-freshwater-cladocerans-ceriodaphnia-silvestrii-and-daphnia-similis
#17
Mariângela Spadoto, Ana Paula Erbetta Sueitt, Carlos Alexandre Galinaro, Tiago da Silva Pinto, Caroline Moço Erba Pompei, Clarice Maria Rispoli Botta, Eny Maria Vieira
Toxicities of bisphenol A (BPA) and nonylphenol (NP) to the neotropical freshwater cladocerans Ceriodaphnia silvestrii and Daphnia similis were studied under laboratory conditions. Acute exposures to BPA generated mean 48-h EC50 values of 14.44 (6.02-22.85) mg L(-1) for C. silvestrii and 12.05 (1.73-22.37) mg L(-1) for D. similis. When the organisms were exposed to acute doses of NP, mean 48-h EC50 values were 0.055 (0.047-0.064) mg L(-1) (C. silvestrii) and 0.133 (0.067-0.200) mg L(-1) (D. similis). Ceriodaphnia silvestrii was also tested in chronic bioassays, which resulted in mean 8-d IC25 values of 2...
November 8, 2017: Drug and Chemical Toxicology
https://www.readbyqxmd.com/read/29113915/bisphenol-a-accelerates-meiotic-progression-in-embryonic-chickens-via-the-estrogen-receptor-%C3%AE-signaling-pathway
#18
Minli Yu, Yali Xu, Ming Li, Dongfeng Li, Yinglin Lu, Debing Yu, Wenxing Du
Bisphenol A (BPA) as an endocrine-disrupting chemical with weak estrogenic activity affects formation of primordial follicles. This study aimed to identify the potential effects and molecular mechanisms of BPA on meiosis and primordial follicle formation in chickens. The results suggest that the cortical layer was thickened and the number of germ cells that entered into meiosis was increased in BPA-treated ovaries. The percentage of γH2AX-positive cells increased significantly. In addition, up-regulated mRNA expression of meiotic genes, including stimulated by retinoic acid gene 8 (Stra8), disrupted meiotic cDNA 1 homologue (Dmc1) and synaptonemal complex protein 3 (Scp3) were observed in BPA-treated ovaries...
November 4, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29113700/high-performance-dental-resin-composites-with-hydrolytically-stable-monomers
#19
Xiaohong Wang, George Huyang, Sri Vikram Palagummi, Xiaohui Liu, Drago Skrtic, Carlos Beauchamp, Rafael Bowen, Jirun Sun
OBJECTIVE: The objectives of this project were to: 1) develop strong and durable dental resin composites by employing new monomers that are hydrolytically stable, and 2) demonstrate that resin composites based on these monomers perform superiorly to the traditional bisphenol A glycidyl dimethacrylate/triethylene glycol dimethacrylate (Bis-GMA/TEGDMA) composites under testing conditions relevant to clinical applications. METHODS: New resins comprising hydrolytically stable, ether-based monomer, i...
November 4, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29112330/facile-and-versatile-strategy-to-prepare-magnetic-molecularly-imprinted-particles-based-on-the-coassembly-of-magnetic-nanoparticles-and-amphiphilic-random-copolymers
#20
Lili Zhu, Yuhua Cao, Xinjiong Ni, Aimei You, Guangqun Cao
Magnetic molecularly imprinted polymer nanoparticles for bisphenol A were prepared by coassembling magnetic nanoparticles and amphiphilic random copolymers. Under optimized conditions, bisphenol A as template molecules, magnetic molecularly imprinted polymer particles with regular morphology, small size, good monodispersity and high content of OA-Fe3 O4 were prepared by the coassembly method using P(MMA-co-MAA) with monomer ratio of 9:1. These magnetic molecularly imprinted polymer particles could be rapidly collected by an external magnet within 1 min...
November 7, 2017: Journal of Separation Science
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