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https://www.readbyqxmd.com/read/29145094/a-mixture-of-five-endocrine-disrupting-chemicals-modulates-concentrations-of-bisphenol-a-and-estradiol-in-mice
#1
Tyler Pollock, Rachel E Weaver, Ramtin Ghasemi, Denys deCatanzaro
Most people in developed countries are exposed to multiple endocrine-disrupting synthetic chemicals. We previously showed that a single dose of triclosan, tetrabromobisphenol A (TBBPA), butyl paraben, propyl paraben, or di(2-ethylhexyl) phthalate elevated concentrations of bisphenol A (BPA) in mice. Here we investigated whether concurrent exposure to lower doses of these five chemicals could modulate concentrations of bisphenol A (BPA) or the natural estrogen, 17β-estradiol (E2). CF1 mice were injected subcutaneously with 0...
November 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29136910/low-cost-approach-to-increase-the-analysis-throughput-of-bar-adsorptive-microextraction-ba%C3%A2%C2%B5e-combined-with-environmentally-friendly-renewable-sorbent-phase-of-recycled-diatomaceous-earth
#2
Gabriela Mafra, Anderson Luiz Oenning, Adriana Neves Dias, Josias Merib, Dilma Budziak, Cristian Berto da Silveira, Eduardo Carasek
In this study, a novel apparatus for bar adsorptive microextraction (BAµE) using a voltage regulator was proposed as an alternative tool to improve the analysis throughput. In addition, recycled diatomaceous earth obtained as a brewery residue was employed as a biosorbent coating for the determination of methyl paraben, ethyl paraben, benzophenone and triclocarban in water samples by high-performance liquid chromatography-diode array detection (HPLC-DAD). The use of the extraction devices, comprised of floating adsorptive bars of 7...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29136796/a-multi-purpose-tool-for-food-inspection-simultaneous-determination-of-various-classes-of-preservatives-and-biogenic-amines-in-meat-and-fish-products-by-lc-ms
#3
Luciano Molognoni, Heitor Daguer, Leandro Antunes de Sá Ploêncio, Juliano De Dea Lindner
This paper describes an innovative fast and multipurpose method for the chemical inspection of meat and fish products by liquid chromatography-tandem mass spectrometry. Solid-liquid extraction and low temperature partitioning were applied to 17 analytes, which included large bacteriocins (3.5kDa) and small molecules (organic acids, heterocyclic compounds, polyene macrolides, alkyl esters of the p-hydroxybenzoic acid, aromatic, and aliphatic biogenic amines and polyamines). Chromatographic separation was achieved in 10min, using stationary phase of di-isopropyl-3-aminopropyl silane bound to hydroxylated silica...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29126512/what-is-an-endocrine-disruptor
#4
Claude Monneret
Endocrine disrupting chemicals (EDCs) and potential EDCs are mostly man-made found in various materials. By interfering with the body's endocrine system, endocrine disruptors produce adverse developmental, reproductive, neurological, and immune effects in humans, abnormal growth patterns and neurodevelopmental delays in children. Thus, diethylstilbestrol (DES) a non-steroidal estrogen, which is regarded as a proof of concept, induces clear cell carcinoma among young women. EDCS may be found in plastic bottles and metal food cans (BPA), medical devices (phthalates), detergents, flame retardants (polybrominated diphenyl ethers), food (BPA), toys (phthalates), cosmetics and drugs (parabens), and pesticides (alkyl phenols such as nonylphenol)...
September 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/29126084/a-simple-and-highly-selective-molecular-imprinting-polymer-based-methodology-for-propylparaben-monitoring-in-personal-care-products-and-industrial-waste-waters
#5
Ana Vicario, Leslie Aragón, Chien C Wang, Franco Bertolino, María R Gomez
In this work, a novel molecularly imprinted polymer (MIP) proposed as solid phase extraction sorbent was developed for the determination of propylparaben (PP) in diverse cosmetic samples. The use of parabens (PAs) is authorized by regulatory agencies as microbiological preservative; however, recently several studies claim that large-scale use of these preservatives can be a potential health risk and harmful to the environment. Diverse factors that influence on polymer synthesis were studied, including template, functional monomer, porogen and crosslinker used...
November 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29111213/prenatal-and-early-life-triclosan-and-parabens-exposure-and-allergic-outcomes
#6
Kathleen Lee-Sarwar, Russ Hauser, Antonia M Calafat, Xiaoyun Ye, George T O'Connor, Megan Sandel, Leonard B Bacharier, Robert S Zeiger, Nancy Laranjo, Diane R Gold, Scott T Weiss, Augusto A Litonjua, Jessica H Savage
BACKGROUND: In cross-sectional studies, triclosan and parabens, ubiquitous ingredients in personal care and other products, are associated with allergic disease. OBJECTIVES: We investigated the association between prenatal and early life triclosan and parabens exposure and childhood allergic disease in a prospective, longitudinal study. METHODS: Subjects were enrollees in VDAART, the Vitamin D Antenatal Asthma Reduction Trial. Triclosan, methyl paraben and propyl paraben concentrations were quantified in maternal plasma samples pooled from first and third trimesters and urine samples from children at age 3 or 4 years...
October 27, 2017: Journal of Allergy and Clinical Immunology
https://www.readbyqxmd.com/read/29074358/inhibitory-effect-of-silver-nanoparticles-on-proliferation-of-estrogen-dependent-mcf-7-bus-human-breast-cancer-cells-induced-by-butyl-paraben-or-di-n-butyl-phthalate
#7
Joanna Roszak, Anna Smok-Pieniążek, Katarzyna Domeradzka-Gajda, Jarosław Grobelny, Emilia Tomaszewska, Katarzyna Ranoszek-Soliwoda, Grzegorz Celichowski, Maciej Stępnik
In this study the effect of silver nanoparticles (AgNPs) on proliferation of estrogen receptor (ER)-positive human breast cancer MCF-7/BUS cells was assessed by means of in vitro assay. The cells were exposed in the absence of estrogens to AgNPs alone or in combination with aluminum chloride (AlCl3), butyl paraben (BPB) and di-n-butyl phthalate (DBPh). The results revealed that AgNPs at the non-cytotoxic concentrations (up to 2μg/mL) and AlCl3 (up to 500μM) did not induce proliferation of MCF-7/BUS cells whereas BPB and DBPh showed strong estrogenic activity with the highest effect at 16μM and 35μM, respectively...
December 15, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28990203/drug-induced-immune-hemolytic-anemia-associated-with-anti-vancomycin-complicated-by-a-paraben-antibody
#8
Thomas J Gniadek, Patricia A Arndt, Regina M Leger, Daniel Zydowicz, Edward Y Cheng, Nicole D Zantek
BACKGROUND: Drug-induced immune hemolytic anemia (DIIHA) is rare, but potentially life-threatening. A high index of clinical suspicion is required for diagnosis, since the number of medications known to induce DIIHA continues to expand. Additionally, in vitro antibody reactivity against reagent additives has been reported, which may complicate test interpretation. CASE REPORT: A 61-year-old group A, D+ woman with a history of negative antibody detection tests developed hemolytic anemia on Postoperative Day 7 after repeat incision and drainage of a chronically infected right knee prosthesis...
October 8, 2017: Transfusion
https://www.readbyqxmd.com/read/28986771/degradation-of-propyl-paraben-by-activated-persulfate-using-iron-containing-magnetic-carbon-xerogels-investigation-of-water-matrix-and-process-synergy-effects
#9
Maria Evangelia Metheniti, Zacharias Frontistis, Rui S Ribeiro, Adrián M T Silva, Joaquim L Faria, Helder T Gomes, Dionissios Mantzavinos
An advanced oxidation process comprising an iron-containing magnetic carbon xerogel (CX/Fe) and persulfate was tested for the degradation of propyl paraben (PP), a contaminant of emerging concern, in various water matrices. Moreover, the effect of 20 kHz ultrasound or light irradiation on process performance was evaluated. The pseudo-first order degradation rate of PP was found to increase with increasing SPS concentration (25-500 mg/L) and decreasing PP concentration (1690-420 μg/L) and solution pH (9-3)...
October 6, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28985018/the-role-of-graphene-based-sorbents-in-modern-sample-preparation-techniques
#10
Ana Lúcia de Toffoli, Edvaldo Vasconcelos Soares Maciel, Bruno Henrique Fumes, Fernando Mauro Lanças
The application of graphene-based sorbents in sample preparation techniques has increased significantly since 2011. These materials have good physicochemical properties to be used as sorbent and have shown excellent results in different sample preparation techniques. Graphene and its precursor graphene oxide have been considered to be good candidates aiming the improvement of the extraction and concentration of different classes of target compounds (e.g. parabens, polycyclic aromatic hydrocarbon, pyrethroids, triazines, and so on) present in complex matrices...
October 6, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28958548/determination-of-parabens-using-two-microextraction-methods-coupled-with-capillary-liquid-chromatography-uv-detection
#11
Chen-Wen Chen, Wen-Chan Hsu, Ya-Chen Lu, Jing-Ru Weng, Chia-Hsien Feng
Parabens are common preservatives and environmental hormones. As such, possible detrimental health effects could be amplified through their widespread use in foods, cosmetics, and pharmaceutical products. Thus, the determination of parabens in such products is of particular importance. This study explored vortex-assisted dispersive liquid-liquid microextraction techniques based on the solidification of a floating organic drop (VA-DLLME-SFO) and salt-assisted cloud point extraction (SA-CPE) for paraben extraction...
February 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28949801/inter-and-intra-individual-variation-in-urinary-concentrations-of-parabens-in-male-and-female-japanese-subjects
#12
Yukiko Nishihama, Reika Ameda, Jun Yoshinaga, Shoko Konishi, Miyuki Yoneyama, Daisuke Nakajima, Hiroaki Shiraishi, Hideki Imai
We evaluated the representativeness of concentrations of parabens in a spot urine sample for the assessment of long-term exposure levels. Urine sample was taken monthly from 10 male Japanese subjects (35.9 ± 6.8 years) and 12 female Japanese university students (21.1 ± 0.4 years) for 5 months and measured for methyl (MP), ethyl (EP), propyl (PP) and butyl (BP) parabens by liquid chromatography-tandem mass spectrometry. Median (min-max) specific-gravity-adjusted urinary concentrations of the male group (n = 10) were 39...
September 26, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/28948814/prenatal-exposure-to-bisphenols-and-parabens-and-impacts-on-human-physiology
#13
L Kolatorova, M Duskova, J Vitku, L Starka
In modern societies, living organisms are exposed daily to multiform pollution from industrial chemical products. Some of these substances have been shown to affect the endocrine system, and have been termed endocrine disruptors (EDs). Bisphenol A (BPA), which can leach from plastics, and parabens, used in cosmetic products, are among the most well-studied. Prenatal development is a vulnerable phase of human life, and disruptions during this period may have lifelong consequences. Since EDs are known to cross the placental barrier and BPA may accumulate in the fetus, "BPA-free" products have been introduced to the market...
September 26, 2017: Physiological Research
https://www.readbyqxmd.com/read/28937960/prenatal-exposure-to-nonpersistent-endocrine-disruptors-and-behavior-in-boys-at-3-and-5-years
#14
Claire Philippat, Dorothy Nakiwala, Antonia M Calafat, Jérémie Botton, Maria De Agostini, Barbara Heude, Rémy Slama
BACKGROUND: Sex-specific associations have been reported between phthalates, bisphenol A (BPA), and child behavior. No data on large study populations are available for other phenols with possible endocrine-disrupting properties. OBJECTIVES: We aimed to study associations between prenatal exposure to phthalates and several phenols on behavior among male infants. METHODS: We quantified 11 phthalate metabolites and nine phenols (four parabens, benzophenone-3, BPA, two dichlorophenols, triclosan) in spot urine samples collected during pregnancy among EDEN cohort mothers who delivered a boy...
September 15, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934727/in-utero-exposure-to-select-phenols-and-phthalates-and-respiratory-health-in-five-year-old-boys-a-prospective-study
#15
Céline Vernet, Isabelle Pin, Lise Giorgis-Allemand, Claire Philippat, Meriem Benmerad, Joane Quentin, Antonia M Calafat, Xiaoyun Ye, Isabella Annesi-Maesano, Valérie Siroux, Rémy Slama
BACKGROUND: Phenols and phthalates may have immunomodulatory and proinflammatory effects and thereby adversely affect respiratory health. OBJECTIVE: We estimated the associations between gestational exposure to select phthalates and phenols and respiratory health in boys. METHODS: Among 587 pregnant women from the EDEN (Etude des Déterminants pré et post natals du développement et de la santé de l'Enfant) cohort who delivered a boy, 9 phenols and 11 phthalates metabolites were quantified in spot pregnancy urine samples...
September 8, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28934645/graphene-a-new-activator-of-sodium-persulfate-for-the-advanced-oxidation-of-parabens-in-water
#16
Leonidas Bekris, Zacharias Frontistis, George Trakakis, Lamprini Sygellou, Costas Galiotis, Dionissios Mantzavinos
Graphene was successfully employed as a catalyst for the activation of sodium persulfate, towards the effective degradation of propylparaben, an emerging micro-pollutant, representative of the parabens family. A novel process is proposed which utilizes a commercial graphene nano-powder as the catalyst and sodium persulfate as the oxidizing agent. It was found that over 95% of micro-pollutant degradation occurs within 15 min of reaction time. The effects of catalyst loading (75 mg/L to 1 g/L), sodium persulfate (SPS) concentration (10 mg/L to 1 g/L), initial solution pH (3-9) and initial paraben concentration (0...
December 1, 2017: Water Research
https://www.readbyqxmd.com/read/28925944/interference-of-paraben-compounds-with-estrogen-metabolism-by-inhibition-of-17%C3%AE-hydroxysteroid-dehydrogenases
#17
Roger T Engeli, Simona R Rohrer, Anna Vuorinen, Sonja Herdlinger, Teresa Kaserer, Susanne Leugger, Daniela Schuster, Alex Odermatt
Parabens are effective preservatives widely used in cosmetic products and processed food, with high human exposure. Recent evidence suggests that parabens exert estrogenic effects. This work investigated the potential interference of parabens with the estrogen-activating enzyme 17β-hydroxysteroid dehydrogenase (17β-HSD) 1 and the estrogen-inactivating 17β-HSD2. A ligand-based 17β-HSD2 pharmacophore model was applied to screen a cosmetic chemicals database, followed by in vitro testing of selected paraben compounds for inhibition of 17β-HSD1 and 17β-HSD2 activities...
September 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28917789/chemometric-optimization-of-the-extraction-and-derivatization-of-parabens-for-their-determination-in-water-samples-by-rotating-disk-sorptive-extraction-and-gas-chromatography-mass-spectrometry
#18
Mercedes Becerra-Herrera, Valentina Miranda, Daniel Arismendi, Pablo Richter
A combination of rotating disk sorptive extraction (RDSE) using Oasis® HLB as the sorbent phase and gas chromatography mass spectrometry (GC-MS) has been performed for the determination of four of the most widely used parabens: methylparaben, ethylparaben, propylparaben and n-butylparaben. The extraction and derivatization of the analytes in water samples were optimized by using factorial (screening) and Doehlert designs, thus reducing the number of analyses with the concomitant reduction of time, reagents, waste, samples and cost...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28902174/distribution-of-non-persistent-endocrine-disruptors-in-two-different-regions-of-the-human-brain
#19
Thomas P van der Meer, Francisco Artacho-Cordón, Dick F Swaab, Dicky Struik, Konstantinos C Makris, Bruce H R Wolffenbuttel, Hanne Frederiksen, Jana V van Vliet-Ostaptchouk
Non-persistent endocrine disrupting chemicals (npEDCs) can affect multiple organs and systems in the body. Whether npEDCs can accumulate in the human brain is largely unknown. The major aim of this pilot study was to examine the presence of environmental phenols and parabens in two distinct brain regions: the hypothalamus and white-matter tissue. In addition, a potential association between these npEDCs concentrations and obesity was investigated. Post-mortem brain material was obtained from 24 individuals, made up of 12 obese and 12 normal-weight subjects (defined as body mass index (BMI) > 30 and BMI < 25 kg/m², respectively)...
September 13, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28886595/personal-care-product-use-in-men-and-urinary-concentrations-of-select-phthalate-metabolites-and-parabens-results-from-the-environment-and-reproductive-health-earth-study
#20
Feiby L Nassan, Brent A Coull, Audrey J Gaskins, Michelle A Williams, Niels E Skakkebaek, Jennifer B Ford, Xiaoyun Ye, Antonia M Calafat, Joseph M Braun, Russ Hauser
BACKGROUND: Personal care products (PCPs) are exposure sources to phthalates and parabens; however, their contribution to men's exposure is understudied. OBJECTIVES: We examined the association between PCP use and urinary concentrations of phthalate metabolites and parabens in men. METHODS: In a prospective cohort, at multiple study visits, men self-reported their use of 14 PCPs and provided a urine sample (2004-2015, Boston, MA). We measured urinary concentrations of 9 phthalate metabolites and methylparaben, propylparaben, and butylparaben...
August 18, 2017: Environmental Health Perspectives
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