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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/28208108/dietary-administration-of-edc-mixtures-a-focus-on-fish-lipid-metabolism
#4
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/28202054/increase-of-urinary-malondialdehyde-level-by-bisphenol-a-exposure-a-longitudinal-panel-study
#5
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/28196854/hypothalamic-transcriptomic-alterations-in-male-and-female-california-mice-peromyscus-californicus-developmentally-exposed-to-bisphenol-a-or-ethinyl-estradiol
#6
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
#7
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/28187347/influence-of-blooms-of-phytoplankton-on-concentrations-of-hydrophobic-organic-chemicals-in-sediments-and-snails-in-a-hyper-eutrophic-freshwater-lake
#8
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
#9
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/28185256/quantitative-differentiation-of-bloodstain-patterns-resulting-from-gunshot-and-blunt-force-impacts
#10
Sonya Siu, Jennifer Pender, Faye Springer, Frederic Tulleners, William Ristenpart
Bloodstain pattern analysis (BPA) provides significant evidentiary value in crime scene interpretation and reconstruction. In this work, we develop a quantitative methodology using digital image analysis techniques to differentiate impact bloodstain patterns. The bloodstain patterns were digitally imaged and analyzed using image analysis algorithms. Our analysis of 72 unique bloodstain patterns, comprising more than 490,000 individual droplet stains, indicates that the mean drop size in a gunshot spatter pattern is at most 30% smaller than the mean drop stain size in blunt instrument patterns...
February 10, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28182974/diamond-based-electrochemical-aptasensor-realizing-a-femtomolar-detection-limit-of-bisphenol-a
#11
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
https://www.readbyqxmd.com/read/28181297/induction-of-oxidative-stress-by-bisphenol-a-and-its-pleiotropic-effects
#12
REVIEW
Natalie R Gassman
Bisphenol A (BPA) has become a target of intense public scrutiny since concerns about its association with human diseases such as obesity, diabetes, reproductive disorders, and cancer have emerged. BPA is a highly prevalent chemical in consumer products, and human exposure is thought to be ubiquitous. Numerous studies have demonstrated its endocrine disrupting properties and attributed exposure with cytotoxic, genotoxic, and carcinogenic effects; however, the results of these studies are still highly debated and a consensus about BPA's safety and its role in human disease has not been reached...
February 9, 2017: Environmental and Molecular Mutagenesis
https://www.readbyqxmd.com/read/28181074/bisphenol-a-concentration-in-human-saliva-related-to-dental-polymer-based-fillings
#13
T L L Berge, G B Lygre, B A G Jönsson, C H Lindh, L Björkman
OBJECTIVES: The aims of this study were to quantify salivary concentrations of bisphenol A (BPA) and to assess if presence of dental composite fillings is associated with higher BPA levels in saliva. MATERIALS AND METHODS: Twenty individuals with six or more tooth surfaces filled with polymer-based dental materials (composite group) and 20 individuals without any polymer-based materials (control group) were included in the study. Saliva was collected in polypropylene tubes and stored at -80 °C before analysis...
February 9, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28178360/melatonin-protects-oocyte-quality-from-bisphenol-a-induced-deterioration-in-the-mouse
#14
Mianqun Zhang, Xiaoxin Dai, Yajuan Lu, Yilong Miao, Changyin Zhou, Zhaokang Cui, Honglin Liu, Bo Xiong
BPA (Bisphenol A) has been reported to adversely affect the mammalian reproductive system in both sexes. However, the underlying mechanisms regarding how BPA disrupts the mammalian oocyte quality and how to prevent it have not been fully defined. Here, we document that BPA weakens oocyte quality by impairing both oocyte meiotic maturation and fertilization ability. We find that oral administration of BPA (100 μg/kg body weight per day for 7 days) compromises the first polar body extrusion (78.0% VS 57.0%, p < 0...
February 8, 2017: Journal of Pineal Research
https://www.readbyqxmd.com/read/28173802/malaria-from-hyperendemicity-to-elimination-in-hekou-county-on-china-vietnam-border-an-ecological-study
#15
Jian-Wei Xu, Jian-Jie Li, Hong-Ping Guo, Shu-Wei Pu, Shu-Mei Li, Rong-Hua Wang, Hui Liu, Wei-Jia Wang
BACKGROUND: Malaria control and elimination are challenged by diversity and complexity of the determinants on the international border in the Great Mekong Sub-region. Hekou, a Chinese county on the China-Vietnam border, was used to document Chinese experiences and lessons for malaria control and elimination. METHODS: The design was an ecological study. Malaria burden before 1951 and procedures of 64 years (1952-2015) from malaria hyperendemicity to elimination are described...
February 7, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28167136/thyroid-hormone-disrupting-potentials-of-bisphenol-a-and-its-analogues-in-vitro-comparison-study-employing-rat-pituitary-gh3-and-thyroid-follicular-frtl-5-cells
#16
Sangwoo Lee, Cheolmin Kim, Hyewon Youn, Kyungho Choi
As adverse health effects of bisphenol A (BPA) become a growing public health concern, the chemicals substituting BPA have been increasingly used in everyday lives. BPA substitutes have been frequently detected in both environment and biota in increasing levels. However, very limited toxicological information is available for these chemicals. In the present study, thyroid disrupting effects of nine structural analogues of BPA were evaluated along with BPA, using rat pituitary (GH3) and thyroid follicular (FRTL-5) cells...
February 5, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28165156/pancreatic-impairment-and-igf2-hypermethylation-induced-by-developmental-exposure-to-bisphenol-a-can-be-counteracted-by-maternal-folate-supplementation
#17
Zhenxing Mao, Wei Xia, Wenqian Huo, Tongzhang Zheng, Bryan A Bassig, Huailong Chang, Tian Chen, Feie Li, Yunxin Pan, Yang Peng, Yuanyuan Li, Shunqing Xu
Increasing evidence indicates that bisphenol A (BPA), a widely manufactured environmental pollutant, can induce changes in DNA methylation paatterns, which is a potential mechanism linking this environmental exposure to disease development. We investigated the influence of developmental exposure to BPA on pancreatic DNA methylation patterns and whether maternal folate supplementation can modify the epigenetic status and pancreatic impairment induced by BPA. Our results showed that maternal dietary folate supplementation in rats exposed to BPA counteracted the observed BPA-induced pancreatic impairments in the offspring, which included disrupted insulin secretion and glucose intolerance, and impaired morphology and ultrastructure of β cells...
February 6, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28162796/-balloon-pulmonary-angioplasty-an-additional-treatment-option-to-improve-the-status-of-patients-with-chronic-thromboembolic-pulmonary-hypertension
#18
H Bouvaist
In chronic thromboembolic pulmonary hypertension (CTEPH), stenoses or obstructions of the pulmonary arteries due to organized thrombi can cause an elevation in pulmonary artery resistance, which in turn can result in pulmonary hypertension and progressive right heart failure. CTEPH can be cured surgically by pulmonary endarterectomy (PEA); however, patients deemed unsuitable for PEA due to distal lesion, advanced age, or comorbidities have a poor prognosis and limited treatment options. Recently, an alternative interventional strategy of balloon pulmonary angioplasty (BPA) reduces pulmonary artery hypertension in patients with CTEPH...
February 2, 2017: Revue de Pneumologie Clinique
https://www.readbyqxmd.com/read/28159858/transcriptomic-alterations-in-the-brain-of-painted-turtles-chrysemys-picta-developmentally-exposed-to-bisphenol-a-or-ethinyl-estradiol
#19
Lindsey K Manshack, Caroline M Conard, Sara J Bryan, Sharon L Deem, Dawn K Holliday, Nathan J Bivens, Scott A Givan, Cheryl Susan Rosenfeld
Developmental exposure of turtles and other reptiles to endocrine disrupting chemicals (EDCs), including bisphenol A (BPA) and ethinyl estradiol (EE), can stimulate partial to full gonadal sex-reversal in males. We have also recently shown that in ovo exposure to either EDC can induce similar sex-dependent behavioral changes typified by improved spatial learning and memory or possibly feminized brain responses. Observed behavioral changes are presumed to be due to BPA- and EE-induced brain transcriptomic alterations during development...
February 3, 2017: Physiological Genomics
https://www.readbyqxmd.com/read/28159674/extranuclear-initiated-estrogenic-actions-of-endocrine-disrupting-chemicals-is-there-toxicology-beyond-paracelsus
#20
Angel Nadal, Esther Fuentes, Cristina Ripoll, Sabrina Villar-Pazos, Manuel Castellano-Muñoz, Sergi Soriano, Juan Martinez-Pinna, Ivan Quesada, Paloma Alonso-Magdalena
Endocrine Disrupting Chemicals (EDCs), including bisphenol-A (BPA) do not act as traditional toxic chemicals inducing massive cell damage or death in an unspecific manner. EDCs can work upon binding to hormone receptors, acting as agonists, antagonists or modulators. Bisphenol-A displays estrogenic activity and, for many years it has been classified as a weak estrogen, based on the classic transcriptional action of estrogen receptors serving as transcription factors. However, during the last two decades our knowledge about estrogen signaling has advanced considerably...
January 31, 2017: Journal of Steroid Biochemistry and Molecular Biology
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