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https://www.readbyqxmd.com/read/29330898/determination-of-phthalate-esters-in-soil-using-a-quick-easy-cheap-effective-rugged-and-safe-method-followed-by-gc-ms
#1
Qianjun Liu, Di Chen, Jiyuan Wu, Guangcai Yin, Qintie Lin, Min Zhang, Huawen Hu
A quick, easy, cheap, effective, rugged, and safe procedure was designed to extract pesticide residues from fruits and vegetables with a high percentage of water. It has not been used extensively for the extraction of phthalate esters from sediments, soils and sludges. In this work, this procedure was combined with gas chromatography with mass spectrometry to determine 16 selected phthalate esters in soil. The extraction efficiency of the samples was improved by ultrasonic extraction and dissolution of the soil samples in ultra-pure water, which promoted the dispersion of the samples...
January 13, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/29328989/inhibition-of-udp-glucuronosyltransferases-ugts-by-phthalate-monoesters
#2
Zuo Du, Yun-Feng Cao, Sai-Nan Li, Cui-Min Hu, Zhi-Wei Fu, Chun-Ting Huang, Xiao-Yu Sun, Yong-Zhe Liu, Kun Yang, Zhong-Ze Fang
Phthalate monoesters are important metabolites of phthalate esters (PAEs) which have been extensively utilized in industry. This study aims to investigate the inhibition of phthalate monoesters on the activity of various isoforms of UDP-glucuronosyltransferases (UGTs), trying to elucidate the toxicity mechanism of environmental endocrine disruptors from the new perspectives. In vitro recombinant UGTs-catalyzed glucuronidation of 4-methylumbelliferone (4-MU) was employed to evaluate 8 kinds of phthalate monoesters on 11 sorts of main human UGT isoforms...
January 5, 2018: Chemosphere
https://www.readbyqxmd.com/read/29328408/genistein-attenuates-di%C3%A2-2%C3%A2-ethylhexyl-phthalate-induced-testicular-injuries-via-activation-of-nrf2-ho%C3%A2-1-following-prepubertal-exposure
#3
Liandong Zhang, Hecheng Li, Ming Gao, Tongdian Zhang, Zhizhong Wu, Ziming Wang, Tie Chong
Di‑(2‑ethylhexyl) phthalate (DEHP) and genistein (GEN) are of the most common endocrine disrupting chemicals (EDCs) present in the environment or the diet. However, investigation of the effects of acute exposure to these two EDCs during prepuberty has been lacking. In this study, DEHP and GEN were administrated to prepubertal male Sprague‑Dawley rats by gavage from PND22 to PND35 with vehicle control, GEN 50 mg/kg body weight (bw)/day, DEHP50, 150 and 450 mg/kg bw/day, and combined treatment. Reproductive parameters including testis weight, anogenital distance and organ coefficient were evaluated on PND36...
January 9, 2018: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29327003/carbon-dots-as-absorbance-promoter-probes-for-detection-of-cu-ii-ions-in-aqueous-solution-central-composite-design-approach
#4
S A R Shahamirifard, M Ghaedi, M Montazerozohori, A Masoudiasl
In this work, the use of carbon dots (CDs) as a complexing agent and sensitizer in a polymeric matrix for determination of copper(ii) by UV-vis spectroscopy is reported for the first time. A new and highly selective Schiff base, namely, (N',N'''E,N',N'''E)-N',N'''-((((2-hydroxypropane-1,3-diyl)bis(oxy))bis(2,1-phenylene))bis(methan-ylylidene))di(isonicotinohydrazide) (NHBMDI), was also incorporated in the polymeric matrix. For the first time, the membrane composition of the proposed optical sensor including NHBMDI as the ionophore, tetraphenylborate (NaTPB) as the anionic additive, dibutyl phthalate (DBP) as the plasticizer and polyvinyl chloride (PVC) as the immobilizer was optimized through central composite design combined with the desirability function approach (DFA) because this method saves material and time consumption and is therefore cost effective...
January 12, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29325824/in-utero-combined-di-2-ethylhexyl-phthalate-and-diethyl-phthalate-exposure-cumulatively-impairs-rat-fetal-leydig-cell-development
#5
Guoxin Hu, Junwei Li, Yuanyuan Shan, Xiaoheng Li, Qiqi Zhu, Huitao Li, Yiyan Wang, Xiaofang Chen, Qingquan Lian, Ren-Shan Ge
Phthalate diesters, including di-(2-ethylhexyl) phthalate (DEHP) and diethyl phthalate (DEP), are chemicals to which humans are ubiquitously exposed. Humans are exposed simultaneously to multiple environmental chemicals, including DEHP and DEP. There is little information available about how each chemical may interact to each other if they were exposed at same time. The present study investigated effects of the combinational exposure of rats to DEP and DEHP on fetal Leydig cell development. The results showed that the gestational (GD12-20) exposure of DEP + DEHP resulted in synergistic and/or dose-additive effects on the development of fetal Leydig cell...
January 8, 2018: Toxicology
https://www.readbyqxmd.com/read/29322929/ontology-based-systematic-representation-and-analysis-of-traditional-chinese-drugs-against-rheumatism
#6
Qingping Liu, Jiahao Wang, Yan Zhu, Yongqun He
BACKGROUND: Rheumatism represents any disease condition marked with inflammation and pain in the joints, muscles, or connective tissues. Many traditional Chinese drugs have been used for a long time to treat rheumatism. However, a comprehensive information source for these drugs is still missing, and their anti-rheumatism mechanisms remain unclear. An ontology for anti-rheumatism traditional Chinese drugs would strongly support the representation, analysis, and understanding of these drugs...
December 21, 2017: BMC Systems Biology
https://www.readbyqxmd.com/read/29317738/personal-care-product-use-as-a-predictor-of-urinary-concentrations-of-certain-phthalates-parabens-and-phenols-in-the-hermosa-study
#7
Kimberly P Berger, Katherine R Kogut, Asa Bradman, Jianwen She, Qi Gavin, Rana Zahedi, Kimberly L Parra, Kim G Harley
Use of personal care products, such as makeup, soaps, and sunscreen, may expose adolescent girls to potential endocrine disruptors, including phthalates, parabens, and other phenols. We evaluated the relationship between recent self-reported personal care product use and concentrations for urinary metabolites of phthalates, parabens, triclosan, and benzophenone-3 (BP-3) in 100 Latina adolescents. Girls who reported using makeup every day vs. rarely/never had higher urinary concentrations of monoethyl phthalate (MEP) (102...
January 9, 2018: Journal of Exposure Science & Environmental Epidemiology
https://www.readbyqxmd.com/read/29310293/preparation-of-magnetic-mesoporous-poly-melamine-formaldehyde-composite-for-efficient-extraction-of-chlorophenols
#8
Xiaolan Wang, Juntao Wang, Caina Jiao, Lin Hao, Qiuhua Wu, Chun Wang, Zhi Wang
A magnetic mesoporous poly-melamine-formaldehyde composite (M-mPMF) was synthesized by covalent grafting of poly-melamine-formaldehyde onto NH2-Fe3O4 surface. The M-mPMF was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and nitrogen adsorption-desorption isotherms. The result shows that the M-mPMF possesses a high porosity, large surface area and strong magnetism. The extraction performance of the M-mPMF was investigated by using it as the magnetic adsorbent for the extraction of chlorophenols from pond water and honey samples prior to high performance liquid chromatographic analysis...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29310287/a-novel-enzyme-linked-immunosorbent-assay-based-on-the-catalysis-of-auncs-bsa-induced-signal-amplification-for-the-detection-of-dibutyl-phthalate
#9
Zhen Zhang, Nuanfei Zhu, Yanmin Zou, Xiangyang Wu, Guangbo Qu, Jianbo Shi
A novel, competitive, enzyme-linked immunosorbent assay (ELISA) was presented in this paper based on the inhibition of catalysis of AuNCs@BSA triggered by dissolved Ag+ for the detection of dibutyl phthalate (DBP). In the immunoassay system, numerous Ag+ was released from AgNPs (labelled on the second antibody, AgNPs@Ab2) in the presence of H2O2 after the competition step, preventing AuNCs@BSA from inducing a color change of 3,3',5,5'-tetramethylbenzidine (TMB) to blue. Due to the signal amplification by the principle, the sensitivity of the modified ELISA was improved with the low limit of detection (LOD) of 4...
March 1, 2018: Talanta
https://www.readbyqxmd.com/read/29310089/interaction-of-melamine-and-di-2-ethylhexyl-phthalate-exposure-on-markers-of-early-renal-damage-in-children-the-2011-taiwan-food-scandal
#10
Chia-Fang Wu, Chao A Hsiung, Hui-Ju Tsai, Yi-Chun Tsai, Hui-Min Hsieh, Bai-Hsiun Chen, Ming-Tsang Wu
Melamine and phthalate, mainly di-(2-ethylhexyl) phthalate (DEHP), are ubiquitously present in the general environment. We investigated whether urine melamine levels can modify the relationship between DEHP exposure and markers of early renal damage in children. A nationwide health survey for Children aged ≤12 years possibly exposed to phthalates were enrolled between August 2012 and January 2013. They were administered questionnaires to collect details regarding past DEHP exposure to phthalate-tainted foodstuffs...
January 5, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29307043/plastic-toys-as-a-source-of-exposure-to-bisphenol-a-and-phthalates-at-childcare-facilities
#11
Gangadhar Andaluri, Muruganandham Manickavachagam, Rominder Suri
Infants and toddlers are constantly exposed to toys at childcare facilities. Toys are made of a variety of plastics that often use endocrine-disrupting chemicals such as bisphenol-A (BPA) and phthalates as their building blocks. The goal of this study was to assess the non-dietary exposure of infants and toddlers to BPA and phthalates via leaching. We have successfully developed wipe tests to evaluate the leachability of BPA and phthalates from toys used at several day care facilities in Philadelphia. Our studies have shown an average leaching of 13-280 ng/cm2 of BPA and phthalates...
January 6, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/29300916/effects-of-perinatal-exposure-to-phthalates-and-a-high-fat-diet-on-maternal-behavior-and-pup-development-and-social-play
#12
Daniel G Kougias, Laura R Cortes, Laura Moody, Steven Rhoads, Yuan-Xiang Pan, Janice M Juraska
Humans are ubiquitously exposed to many phthalates, a class of endocrine-disrupting chemicals commonly used in many consumer goods, and diet, especially fatty foods, is presumed to be a major source of exposure. Here, we use a rat model of human prenatal exposure to investigate the potential interactive effects of an environmentally relevant mixture of phthalates and a maternal high-fat diet (HFD). From gestation through postnatal day (P)10, dams consumed the mixture of phthalates (0, 200, or 1000 μg/kg/day) and were fed a control or HFD...
December 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/29300862/reproductive-alterations-in-chronically-exposed-female-mice-to-environmentally-relevant-doses-of-a-mixture-of-phthalates-and-alkylphenols
#13
Daniel Patiño-García, Leonor Cruz-Fernandes, Julio Buñay, Jaime Palomino, Ricardo D Moreno
Endocrine-disrupting chemicals (EDCs) are exogenous compounds that modify hormone biosynthesis, causing adverse effects to human health. Among them, phthalates, and alkylphenols are important due to their wide use in plastics, detergents, personal care products, cosmetics and food packaging. However, their conjoint effects over reproductive female health have not been addressed. The aim of this work was to test the effect of chronically exposed female mice to a mixture of three phthalates [bis (2-ethylhexyl), dibutyl and benzyl butyl] and two alkylphenols [4-nonylphenol and 4-tert-octylphenol], from conception to adulthood at environmentally relevant doses...
December 28, 2017: Endocrinology
https://www.readbyqxmd.com/read/29291449/health-risk-assessment-of-reclaimed-wastewater-a-case-study-of-a-conventional-water-reclamation-plant-in-nanjing-china
#14
Yongfeng Deng, Melvin Bonilla, Hongqiang Ren, Yan Zhang
Contaminated reclaimed wastewater has the potential to induce adverse effects on the health of wastewater workers and residents. However, few studies have focused on these health risks. In this study, we assessed the health risk of samples collected from different treatment processing units used in a typical water reclamation plant in Nanjing, China. Chemical analysis revealed that 40 semi-volatile organic compounds (SVOCs) and 6 N-nitrosamines (NAs) persisted after wastewater treatment. A health risk assessment revealed that the SVOCs in effluents pose negligible non-carcinogenic risk to wastewater workers and local residents as both the hazard quotient (HQ) and hazard index (HI) were all below 1...
December 29, 2017: Environment International
https://www.readbyqxmd.com/read/29290063/removal-mechanism-of-di-n-butyl-phthalate-and-oxytetracycline-from-aqueous-solutions-by-nano-manganese-dioxide-modified-biochar
#15
Minling Gao, Yue Zhang, Xiaolei Gong, Zhengguo Song, Zeyang Guo
In this work, nano-manganese dioxide (nMnO2)-modified biochar (BC) was synthesized in order to improve BC's adsorption capacity for di-n-butyl phthalate (DBP) and oxytetracycline (OTC). The results showed that nMnO2 on the BC surface exhibited a poor crystallinity and oxidation state (Mn (IV)). Sorption experiments showed that, compared to BC, DBP sorption capacity of nMnO2-BC (1:20) and OTC sorption capacity of nMnO2-BC (1:10) were 0.0364 and 0.0867 mmol/g, respectively, which are significantly higher than that of BC (0...
December 30, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29289863/impact-of-endocrine-disrupting-compounds-in-sewage-impacted-coastal-area-on-seabream
#16
Noura Al-Jandal, Talat Saeed, Ismail Azad, Sherain Al-Subiai, Waleed Al-Zekri, Sumaiah Hussain, Enas Al-Hasan
The pollution of coastal regions worldwide has been of a great concern due to the presence of endocrine disrupting chemicals (EDCs). These chemicals find their way to the marine environment via the sewage treatment plants (STPs). Hence, this study was designed to investigate the status and sources of EDCs and their effect on fish in Kuwait's coastal areas, from the chemical and biological perspectives. The assessment of three STPs indicated the presence of significant levels of phthalates (19 and 31µg/l), alkylphenols (85 and 159ng/l), and estrogens (30 and 368ng/l) in both inflow and outflow samples...
December 28, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29288721/treatment-of-%C3%AE-thujaplicin-counteracts-di-2-ethylhexyl-phthalate-dehp-exposed-vascular-smooth-muscle-activation-inflammation-and-atherosclerosis-progression
#17
Mei Fen Shih, Kuang-Hung Pan, Chia-Chyuan Liu, Chia-Rui Shen, Jong Yuh Cherng
The initiation of atherosclerosis involves up-regulation of molecules such as E-selectin, VCAM-1, and ICAM-1. The progression of atherosclerosis is linked to proliferation and migration of vascular smooth muscle cell via MMP-2 and MMP-9 activities. However, the etiology of atherosclerosis concerning plasticizers is unknown. We evaluated β-thujaplicin in preventing the development of atherosclerosis in a model induced by pro-inflammatory cytokines. Moreover, we established a new atherosclerosis model in vascular smooth muscle cells (VSMC) exposed to a common contact plasticizer, di(2-ethylhexyl)phthalate (DEHP)...
December 27, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/29285703/phthalate-esters-in-surface-water-of-songhua-river-watershed-associated-with-land-use-types-northeast-china
#18
Zhidan Wen, Xiaoli Huang, Dawen Gao, Ge Liu, Chong Fang, Yingxin Shang, Jia Du, Ying Zhao, Lili Lv, Kaishan Song
The ubiquitous presence of phthalate esters (PAEs) in the environment and their potential role as endocrine disruptors of marine organisms has attracted much attention. The presence of PAEs in different water sources collected from the Songhua River mainstream and its tributaries has been determined in this study. The total concentration of the seven PAEs (∑PAEs) detected was found to range from 1.153 to 7.867 μg L-1, with di(2-ethylhexyl) phthalate (DEHP) present as the predominate PAE congener. Dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), and DEHP were present in all of the water samples analyzed...
December 28, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29283246/graphene-surface-acoustic-wave-sensor-for-simultaneous-detection-of-charge-and-mass
#19
Satoshi Okuda, Takao Ono, Yasushi Kanai, Takashi Ikuta, Masaaki Shimatani, Shinpei Ogawa, Kenzo Maehashi, Koichi Inoue, Kazuhiko Matsumoto
We have combined a graphene field-effect transistor (GFET) and a surface acoustic wave (SAW) sensor on a LiTaO3 substrate to create a graphene surface acoustic wave (GSAW) sensor. When a SAW propagates in graphene, an acoustoelectric current (IA) flows between two attached electrodes. This current has unique electrical characteristics, having both positive and negative peak values with respect to the electrolyte-gate voltage (VEg) in solution. We found that IA is controlled by VEg and the amplitude of the SAW...
December 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/29281496/study-of-the-occurrence-and-ecosystem-danger-of-selected-endocrine-disruptors-in-the-urban-water-cycle-of-the-city-of-bogot%C3%A3-colombia
#20
Diego F Bedoya-Ríos, Jaime A Lara-Borrero, Verónica Duque-Pardo, Carlos A Madera-Parra, Eliana M Jimenez, Andrés F Toro
Endocrine disruptors have been studied for their high occurrence in different environments including aquatic; however, in the context of developing countries, their occurrence, magnitude and potential threat have little information. This study involved the analysis of various components of the urban water cycle in the city of Bogotá, Colombia. As a result, it was found that the compounds with the highest occurrence are plasticizers such as phthalates and bisphenol A, whereas among the drugs, carbamazepine presented the highest concentrations (0...
December 27, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
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