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Bisphenol A

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https://www.readbyqxmd.com/read/28213327/visualizing-bpa-by-molecularly-imprinted-ratiometric-fluorescence-sensor-based-on-dual-emission-nanoparticles
#1
Hongzhi Lu, Shoufang Xu
Construction of ratiometric fluorescent probe often involved in tedious multistep preparation or complicated coupling or chemical modification process. The emergence of dual emission fluorescent nanoparticles would simplify the construction process and avoids the tedious chemical coupling. Herein, we reported a facile strategy to prepare ratiometric fluorescence molecularly imprinted sensor based on dual emission nanoparticles (d-NPs) which comprised of carbon dots and gold nanoclusters for detection of Bisphenol A (BPA)...
February 11, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28213212/a-sensitive-bisphenol-a-voltammetric-sensor-relying-on-aupd-nanoparticles-graphene-composites-modified-glassy-carbon-electrode
#2
Bingyuan Su, Huilin Shao, Na Li, Xiaomei Chen, Zhixiong Cai, Xi Chen
In this work, a sensitive bisphenol A (BPA) electrochemical sensor was assembled using a surfactant-free AuPd nanoparticles-loaded graphene nanosheets (AuPdNPs/GNs) modified electrode. The AuPdNPs monodispersed on GNs were successfully prepared by the spontaneous redox reaction between bimetallic precursors and GNs. Because no surfactant or halide ions were involved in the proposed synthesis, the prepared composite was enabled to directly modify a glassy carbon electrode without any pre-treatments. Moreover, due to the synergetic effect of Au and Pd, AuPdNPs/GNs displayed high electrochemical activity with well-defined voltammetric peaks of BPA oxidation and lower overpotential compared with monometallic PdNPs and AuNPs supported GNs...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28210794/the-rapid-degradation-of-bisphenol-a-induced-by-the-response-of-indigenous-bacterial-communities-in-sediment
#3
Chao Huang, Piao Xu, Guangming Zeng, Danlian Huang, Cui Lai, Min Cheng, Linjing Deng, Chen Zhang, Jia Wan, Linshan Liu
In the present study, sediment was spiked with bisphenol A (BPA) solution to explore the interaction between indigenous bacterial communities and BPA biodegradation in sediment. Results showed that BPA could be adsorbed to the sediment and then biodegraded rapidly. Biodegradation efficiency of BPA in treatments with 10 and 50 mg/L BPA reached 64.3 and 61.8% on the first day, respectively. Quantitative polymerase chain reaction and denaturing gradient gel electrophoresis analysis indicated that BPA affected the densities, species, and diversities of bacteria significantly...
February 16, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28210728/self-initiation-of-uv-photopolymerization-reactions-using-tetrahalogenated-bisphenol-a-meth-acrylates
#4
Théophile Pelras, Wolfgang Knolle, Sergej Naumov, Katja Heymann, Olesya Daikos, Tom Scherzer
The potential of tetrachlorinated and tetrabrominated bisphenol A diacrylates and dimethacrylates for self-initiation of a radical photopolymerization was investigated. The kinetics of the photopolymerization of an acrylic model varnish containing halogenated monomers was studied by real-time FTIR spectroscopy, whereas the formation of reactive species and secondary products was elucidated by laser flash photolysis and product analysis by GC-MS after steady-state photolysis. The interpretation of the experimental data and the analysis of possible reaction pathways were assisted by quantum chemical calculations...
February 17, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28208108/dietary-administration-of-edc-mixtures-a-focus-on-fish-lipid-metabolism
#5
O Carnevali, V Notarstefano, I Olivotto, M Graziano, P Gallo, I Di Marco Pisciottano, L Vaccari, A Mandich, E Giorgini, F Maradonna
Many man-made chemical compounds are recognized as endocrine disruptors and once released into the environment are likely to spread and bioaccumulate in wild species. Due to their lipophilic nature, these substances pass through the cell membrane or bind to specific receptors activating physiological responses that in the long run can cause reproductive impairment, physiological disorders, including the occurrence of metabolic syndromes. One significant source of contamination is represented by the consumption of polluted food...
February 6, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28208107/assessing-the-potential-for-trace-organic-contaminants-commonly-found-in-australian-rivers-to-induce-vitellogenin-in-the-native-rainbowfish-melanotaenia-fluviatilis-and-the-introduced-mosquitofish-gambusia-holbrooki
#6
Philip D Scott, Heather M Coleman, Anne Colville, Richard Lim, Benjamin Matthews, James A McDonald, Ana Miranda, Peta A Neale, Dayanthi Nugegoda, Louis A Tremblay, Frederic D L Leusch
In Australia, trace organic contaminants (TrOCs) and endocrine active compounds (EACs) have been detected in rivers impacted by sewage effluent, urban stormwater, agricultural and industrial inputs. It is unclear whether these chemicals are at concentrations that can elicit endocrine disruption in Australian fish species. In this study, native rainbowfish (Melanotaenia fluviatilis) and introduced invasive (but prevalent) mosquitofish (Gambusia holbrooki) were exposed to the individual compounds atrazine, estrone, bisphenol A, propylparaben and pyrimethanil, and mixtures of compounds including hormones and personal care products, industrial compounds, and pesticides at environmentally relevant concentrations...
February 7, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28208080/enhanced-removal-of-bisphenol-af-by-activated-carbon-alginate-beads-with-cetyltrimethyl-ammonium-bromide
#7
Zheng Tang, Sha Peng, Shuya Hu, Song Hong
Adsorption removal of bisphenol-AF (BPAF) from aqueous solutions by synthesized activated carbon-alginate beads (AC-AB) with cetyltrimethyl ammonium bromide (CTAB) has been studied using two ways. The traditional method (two-step) first synthesized CTAB-modified AC-AB (AC-AB-CTAB), then used it to remove BPAF by adsorption. And one-step method dispersed AC-AB and CTAB in wastewater, followed by the removal of BPAF accompanied with the synthesis of AC-AB-CTAB. The one-step method showed a better performance than the two-step method, achieving a maximum removal of BPAF with 284...
January 31, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28202054/increase-of-urinary-malondialdehyde-level-by-bisphenol-a-exposure-a-longitudinal-panel-study
#8
Jin Hee Kim, Yun-Chul Hong
BACKGROUND: To verify oxidative stress as a possible mechanism that establishes a relationship between exposure to bisphenol A (BPA) and adverse health outcomes in the elderly Korean population, we evaluated the relation between visit-to-visit variations in urinary BPA and oxidative stress biomarker. METHODS: To assess the relation between BPA and urinary malondialdehyde (MDA) as an oxidative stress biomarker, we used a mixed effect model after controlling for age, sex, BMI, drinking status, exercise, urinary cotinine level, PM10 on lag day 2, and mean temperature and dew point on the day...
February 15, 2017: Environmental Health: a Global Access Science Source
https://www.readbyqxmd.com/read/28199788/development-of-fluorescence-surrogates-to-predict-the-photochemical-transformation-of-pharmaceuticals-in-wastewater-effluents
#9
Shuwen Yan, Bo Yao, Lushi Lian, Xinchen Lu, Shane A Snyder, Rui Li, Weihua Song
The photochemical transformation of pharmaceutical and personal care products (PPCPs) in wastewater effluents is an emerging concern for environmental scientists. In the current study, the photodegradation of 29 PPCPs was examined in effluents under simulated solar irradiation. Direct photodegradation, triplet state effluent organic matter (3EfOM*)-mediated and hydroxyl radical (HO•)-mediated degradation are three major pathways in the removal process. With the photodegradation of trace levels of PPCPs, the excitation-emission matrix (EEM) fluorescence intensities of the effluents were also gradually reduced...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28198617/cometabolic-enzymatic-transformation-of-organic-micropollutants-under-methanogenic-conditions
#10
Lorena Gonzalez-Gil, Marta Carballa, Juan M Lema
Anaerobic digestion (AD) has been shown to have the biological potential to decrease the concentrations of several organic micropollutants (OMPs) from sewage sludge. However, the mechanisms and factors behind these biotransformations, which are essential for elucidating the possible transformation products and to foster the complete removal of OMPs via operational strategies, remain unclear. Therefore, this study investigated the transformation mechanisms of 20 OMPs during the methanogenic step of AD with a focus on the role of acetate kinase (AK), which is a key enzyme in methane production...
February 15, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28196854/hypothalamic-transcriptomic-alterations-in-male-and-female-california-mice-peromyscus-californicus-developmentally-exposed-to-bisphenol-a-or-ethinyl-estradiol
#11
Sarah A Johnson, William G Spollen, Lindsey K Manshack, Nathan J Bivens, Scott A Givan, Cheryl S Rosenfeld
Bisphenol A (BPA) is an endocrine-disrupting chemical (EDC) prevalent in many household items. Rodent models and human epidemiological studies have linked this chemical to neurobehavior impairments. In California mice, developmental exposure to BPA results in sociosexual disorders at adulthood, including communication and biparental care deficits, behaviors that are primarily regulated by the hypothalamus. Thus, we sought to examine the transcriptomic profile in this brain region of juvenile male and female California mice offspring exposed from periconception through lactation to BPA or ethinyl estradiol (EE, estrogen present in birth control pills and considered a positive estrogen control for BPA studies)...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28192360/selective-fenton-like-oxidation-of-methylene-blue-on-modified-fe-zeolites-prepared-via-molecular-imprinting-technique
#12
Yuanyuan Zhang, Jiaobo Shang, Yanqun Song, Chuan Rong, Yinghui Wang, Wenyu Huang, Kefu Yu
A facile strategy to increase the selectivity of heterogeneous Fenton oxidation is investigated. The increase was reached by increasing selective adsorption of heterogeneous Fenton catalyst to a target pollutant. The heterogeneous Fenton catalyst was prepared by a two-step process. First, zeolite particles were imprinted by the target pollutant, methylene blue (MB), in their aggregations, and second, iron ions were loaded on the zeolite aggregations to form the molecule imprinted Fe-zeolites (MI-FZ) Fenton catalyst...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28190845/investigation-of-1-dodecylimidazolium-modified-filter-papers-as-a-thin-film-microextraction-phase-for-the-preconcentration-of-bisphenol-a-from-plant-oil-samples
#13
Cunling Ye, Chang Liu, Shen Wang, Zhike Wang
Based on the tunability of ionic liquids (ILs) according to the specific requirement of an application, 1-dodecylimidazolium chloride with amphiphilic structures was chemically fabricated on the surface of filter papers (DIL-FPs) for the first time. After synthesis, DIL-FPs was characterized by scanning electronic microscopy, energy dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. DIL-FPs was used as a novel thin-film microextraction (TFME) phase for the preconcentration of amphiphilic bisphenol A from plant oil samples...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190611/legacy-and-alternative-flame-retardants-in-norwegian-and-uk-indoor-environment-implications-of-human-exposure-via-dust-ingestion
#14
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/28187384/study-on-the-removal-of-organic-micropollutants-from-aqueous-and-ethanol-solutions-by-hap-membranes-with-tunable-hydrophilicity-and-hydrophobicity
#15
Junyong He, Yulian Li, Xingguo Cai, Kai Chen, Hejing Zheng, Chengming Wang, Kaisheng Zhang, Dongyue Lin, Lingtao Kong, Jinhuai Liu
A biocompatible and uniquely defined hydroxyapatite (HAP) adsorption membrane with a sandwich structure was developed for the removal of organic micropollutants for the first time. Both the adsorption and membrane technique were used for the removal of organic micropollutants. The hydrophilicity and hydrophobicity of the HAP adsorbent and membrane were tunable by controlling the surface structure of HAP. The adsorption of organic micropollutants on the HAP adsorbent was studied in batch experiments. The adsorption process was fit with the Freundlich model, while the adsorption kinetics followed the pseudo-second-order model...
February 3, 2017: Chemosphere
https://www.readbyqxmd.com/read/28187347/influence-of-blooms-of-phytoplankton-on-concentrations-of-hydrophobic-organic-chemicals-in-sediments-and-snails-in-a-hyper-eutrophic-freshwater-lake
#16
Wei Shi, Nanyang Yu, Xia Jiang, Zhihua Han, Shuhang Wang, Xiaowei Zhang, Si Wei, John P Giesy, Hongxia Yu
Blooms of phytoplankton, which are common in freshwater ecosystems, might not only affect quality of water but also influence biogeochemical processing of pollutants. Based on three years of field observations in sediments of Tai Lake, China, concentrations of organochlorine (OC) pesticides and polycyclic aromatic hydrocarbons (PAHs) in areas where blooms occurred were 2.4 and 3.4 times greater than concentrations in areas without blooms. Concentrations of octylphenol (OP), nonylphenol (NP) and bisphenol A (BPA) in areas where blooms did not occur were 3...
January 31, 2017: Water Research
https://www.readbyqxmd.com/read/28185845/including-non-dietary-sources-into-an-exposure-assessment-of-the-european-food-safety-authority-the-challenge-of-multi-sector-chemicals-such-as-bisphenol-a
#17
N von Goetz, R Pirow, A Hart, E Bradley, F Poças, D Arcella, I T L Lillegard, C Simoneau, J van Engelen, T Husoy, A Theobald, C Leclercq
In the most recent risk assessment for Bisphenol A for the first time a multi-route aggregate exposure assessment was conducted by the European Food Safety Authority. This assessment includes exposure via dietary sources, and also contributions of the most important non-dietary sources. Both average and high aggregate exposure were calculated by source-to-dose modeling (forward calculation) for different age groups and compared with estimates based on urinary biomonitoring data (backward calculation). The aggregate exposure estimates obtained by forward and backward modeling are in the same order of magnitude, with forward modeling yielding higher estimates associated with larger uncertainty...
February 7, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28185731/phenolic-endocrine-disrupting-compounds-in-the-pearl-river-estuary-occurrence-bioaccumulation-and-risk-assessment
#18
Panpan Diao, Qi Chen, Rui Wang, Dong Sun, Zhuoping Cai, Hao Wu, Shunshan Duan
Three phenolic endocrine-disrupting compounds, 4-nonylphenol, 4-tert-octylphenol and bisphenol A, were determined in water, sediment and biota (fish, shrimp and mollusk) collected from sites along the Pearl River Estuary, China. The 4-nonylphenol, 4-tert-octylphenol and bisphenol A concentrations ranged from 1.20-3352.86ng/L in the water, <0.17-20.80ng/g dw in the sediment and <1.49-237.12ng/g dw in the biota. The concentrations of 4-nonylphenol were higher than those of 4-tert-octylphenol and bisphenol A in the water, sediment and organisms...
February 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28184387/controllable-preparation-of-core-shell-magnetic-covalent-organic-framework-nanospheres-for-efficient-adsorption-and-removal-of-bisphenols-in-aqueous-solution
#19
Yang Li, Cheng-Xiong Yang, Xiu-Ping Yan
We herein report a monomer-mediated in situ growth strategy for the controllable construction of porous nanospheres with a magnetic core and a tunable COF shell. The composite exhibits high stability and excellent performance for the removal of a typical class of endocrine-disrupting chemicals, bisphenol chemicals, in aqueous solution.
February 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28182974/diamond-based-electrochemical-aptasensor-realizing-a-femtomolar-detection-limit-of-bisphenol-a
#20
Yibo Ma, Junsong Liu, Hongdong Li
In this study, we designed and fabricated an electrochemical impedance aptasensor based on Au nanoparticles (Au-NPs) coated boron-doped diamond (BDD) modified with aptamers, and 6-mercapto-1-hexanol (MCH) for the detection of bisphenol A (BPA). The constructed BPA aptasensor exhibits good linearity from 1.0×10(-14) to 1.0×10(-9)molL(-1). The detection limitation of 7.2×10(-15)molL(-1) was achieved, which can be attributed to the synergistic effect of combining BDD with Au-NPs, aptamers, and MCH. The examine results of BPA traces in Tris-HCl buffer and in milk, UV spectra of aptamer/BPA and interference test revealed that the novel aptasensors are of high sensitivity, specificity, stability and repeatability, which could be promising in practical applications...
January 21, 2017: Biosensors & Bioelectronics
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