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phthalate ester

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https://www.readbyqxmd.com/read/30535948/a-triazine-based-organic-framework-with-micropores-and-mesopores-for-use-in-headspace-solid-phase-microextraction-of-phthalate-esters
#1
Huihua Guo, Gang Chen, Jiutong Ma, Qiong Jia
A dual-pore covalent organic framework (COF) that contains micropores and mesopores was prepared from 2,4,6-triphenoxy-1,3,5-triazine (TPT). A building block is used in which double linking sites were introduced at each branch of a C3 -symmetric skeleton. The COF is shown to be a viable coating for fibers for solid-phase microextraction of phthalic acid esters (PAEs). Its high specific surface, high hydrophobicity, and wide pore size distribution of a TPT-COF coated fiber result in extraordinarily powerful extraction of PAEs...
December 7, 2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/30529591/sorption-removal-of-phthalate-esters-and-bisphenols-to-biofilms-from-urban-river-from-macroscopic-to-microcosmic-investigation
#2
Longfei Wang, Yi Li, Peisheng Zhang, Shujuan Zhang, Peng Li, Peifang Wang, Chao Wang
River biofilms play fundamental roles in shaping the architecture of aquatic systems. Sorption to biofilms was thought to be a crucial mechanism controlling the fate and transport of trace emerging contaminants. This study focused on the role of in situ colonized river biofilms in the early fate of phthalate esters (PAEs) and bisphenols (BPs) at trace concentrations in a representative urban river. PAEs and BPs were readily sorbed to biofilms with uptakes of 38.2-162.5 μg/g for PAEs and 1787.7-4425.6 μg/g for BPs, respectively...
November 29, 2018: Water Research
https://www.readbyqxmd.com/read/30508791/occurrence-and-distribution-of-phthalate-esters-in-freshwater-aquaculture-fish-ponds-in-pearl-river-delta-china
#3
Zhang Cheng, Jun-Bo Liu, Meng Gao, Guang-Ze Shi, Xiao-Jiao Fu, Peng Cai, Yan-Feng Lv, Zhong-Bao Guo, Chun-Qiao Shan, Zhan-Biao Yang, Xiao-Xun Xu, Jun-Ren Xian, Yuan-Xiang Yang, Kai-Bin Li, Xiang-Ping Nie
The concentrations, congener profiles and spatial distribution of 13 phthalate esters (PAEs) in the freshwater fish ponds in the Pearl River Delta (PRD) region were investigated in water and sediment samples collect from 22 sites during Jul. 2016-Sept. 2017. The di-2-ethylhexyl phthalate (DEHP) was the predominant compounds in both water and sediment samples, accounting for 70.1% and 66.1% of ∑PAEs, respectively. The DEHP concentrations in the water samples collected from the sites of Zhongshan (35.7 μg/L), Jingmen (17...
November 27, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/30503584/enhancement-of-mouse-contact-hypersensitivity-appears-with-a-short-chain-triacylglycerol-but-not-with-a-long-chain-one
#4
Kota Sekiguchi, Kohta Kurohane, Masato Tsutsumi, Narumi Mochizuki, Akimasa Orii, Mutsumi Nose, Yasuyuki Imai
The prevalence of skin allergies could be partly due to the increased exposure to chemicals from consumer products. Chemicals that can enhance hypersensitivity caused by other chemicals are the focus of this study. We have demonstrated that phthalate esters with short chain alcohols enhance fluorescein isothiocyanate (FITC)-induced contact hypersensitivity (CHS) in a mouse model. We have also found that tributyrin, a triacylglycerol (TAG) with three butyric acids, enhances sensitization to FITC. To elucidate such an enhanced skin sensitization might be based on a general feature of TAG, we compared tributyrin and triolein, a natural TAG, as to an adjuvant effect on FITC-CHS...
November 29, 2018: Toxicology
https://www.readbyqxmd.com/read/30502188/green-construction-of-fe-3-o-4-gc-submicrocubes-for-highly-sensitive-magnetic-dispersive-solid-phase-extraction-of-five-phthalate-esters-in-beverages-and-plastic-bottles
#5
Yao Tong, Xueyan Liu, Lei Zhang
A well-designed core-shelled Fe3 O4 @graphitic carbon (Fe3 O4 @GC) submicrocube was in situ constructed in a simple, relatively green and eco-friendly ways basing on one-step pyrolysis of low-cost waste napkins-coated Fe2 O3 submicrocubes. The Fe3 O4 @GC submicrocubes showed unique architectures where in situ generated thin graphitic carbon layer wrapped on the surface of Fe3 O4 , resulting in excellent affinity to five phthalate esters (PAEs), good reusability and rapid magnetic separation, therefore were employed as magnetic dispersive solid-phase extraction material combined with HPLC to simultaneously detect five trace PAEs in beverages and plastic bottles...
March 30, 2019: Food Chemistry
https://www.readbyqxmd.com/read/30481674/urinary-concentrations-of-phenols-and-phthalate-metabolites-reflect-extracellular-vesicle-microrna-expression-in-follicular-fluid
#6
Rosie M Martinez, Russ Hauser, Liming Liang, Abdallah Mansur, Michal Adir, Laura Dioni, Catherine Racowsky, Valentina Bollati, Andrea A Baccarelli, Ronit Machtinger
BACKGROUND: Phenols and phthalates are potential endocrine disrupting chemicals (EDCs) that are associated with adverse health outcomes. These EDCs dysregulate a number of biomolecules and pathways, including microRNAs. MicroRNAs can be carried in transport systems called extracellular vesicles (EVs) that are present in most biofluids. EVs in the follicular fluid, which fills the ovarian follicle and influences oocyte developmental competency, carry microRNAs (EV-miRNAs) that have been associated with In Vitro Fertilization (IVF) outcomes...
November 24, 2018: Environment International
https://www.readbyqxmd.com/read/30480371/air-assisted-liquid-liquid-extraction-coupled-with-dispersive-liquid-liquid-microextraction-and-a-drying-step-for-extraction-and-preconcentration-of-some-phthalate-esters-from-edible-oils-prior-to-their-determination-by-gc
#7
Leila Khoshmaram, Hossein AbdolmohammadZadeh, Elham Ghaffarzadeh
In this work, a new, cheap, simple, fast and low organic solvent consuming procedure is proposed for isolation, enrichment and gas chromatographic determination of some phthalate esters in edible oils. The method is based on a combination of air - assisted liquid-liquid extraction and dispersive liquid-liquid microextraction followed by a drying step under N2 gas. Several experimental parameters affecting both extraction and preconcentration steps were investigated and optimized. Under the optimum conditions for the proposed method, wide linear ranges (0...
November 27, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/30476341/all-trans-retinoic-acid-disrupts-development-in-ex-vivo-cultured-fetal-rat-testes-ii-modulation-of-mono-2-ethylhexyl-phthalate-toxicity
#8
Daniel J Spade, Susan J Hall, Jeremy D Wortzel, Gerardo Reyes, Kim Boekelheide
Humans are universally exposed to low levels of phthalate esters (phthalates), which are used to plasticize polyvinyl chloride. Phthalates exert adverse effects on the development of seminiferous cords in the fetal testis through unknown toxicity pathways. To investigate the hypothesis that phthalates alter seminiferous cord development by disrupting retinoic acid signaling in the fetal testis, gestational day 15 fetal rat testes were exposed for 1-3 days to 10-6 M all-trans retinoic acid (ATRA) alone or in combination with 10-6 to 10-4 M mono-(2-ethylhexyl) phthalate (MEHP) in ex vivo culture...
November 26, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/30472474/phthalate-acid-esters-paes-accumulation-in-coastal-sediments-from-regions-with-different-land-use-configuration-along-the-persian-gulf
#9
Hossein Arfaeinia, Mehdi Fazlzadeh, Farhad Taghizadeh, Reza Saeedi, Jörg Spitz, Sina Dobaradaran
Phthalate acid esters (PAEs) are widely used as plasticizers in various plastic products and have aroused considerable concern over their ubiquitous presence and potentially hazardous effects on the environment. This research provides the first data on PAEs distribution in the sediments of northern part of the Persian Gulf. To determine the concentration of 16 PAEs, 26 samples of sediments were collected from industrial stations (IS), urban stations (US), agricultural stations (AGS), and natural field stations (NS) from Asalouyeh Harbor coasts from Nov 2016 to Jan 2017...
November 22, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30468977/fate-of-four-phthalate-esters-with-presence-of-karenia-brevis-uptake-and-biodegradation
#10
Cuizhu Sun, Ge Zhang, Hao Zheng, Ning Liu, Mei Shi, Xianxiang Luo, Lingyun Chen, Fengmin Li, Shugang Hu
Phthalate esters (PAEs), one class of the most frequently detected endocrine-disrupting chemicals (EDCs) in marine environment, have aroused wide public concerns because of their carcinogenicity, teratogenicity, and mutagenicity. However, the environmental fate of PAEs in the occurrence of harmful algal blooms remains unclear. In this research, four PAEs with different alkyl chains, i.e., dimethyl phthalate (DMP), diethyl phthalate (DEP), diallyl phthalate (DAP), and dipropyl phtalate (DPrP) were selected as models to investigate toxicity, uptake, and degradation of PAEs in seawater grown with K...
November 12, 2018: Aquatic Toxicology
https://www.readbyqxmd.com/read/30458402/insight-into-effects-of-citric-acid-on-adsorption-of-phthalic-acid-esters-paes-in-mangrove-sediments
#11
Haifeng Sun, Ruiyao Ma, Yanli Nan, Ruijie Feng
The adsorption of phthalate esters (PAEs) in mangrove sediment greatly influences their availability to aquatic organisms, however, the adsorption processes of PAEs in mangrove sediment, as well as the effects of root exudates, are poorly understood. In this study, dimethyl phthalate (DMP), diethyl phthalate (DEP) and dibutyl phthalate (DBP) was used as model PAEs to determine the effects and mechanism of citric acid on the adsorption kinetics and isotherms of PAEs in the mangrove sediments. The adsorption kinetics followed pseudo-second order model, describing the characteristics of heterogeneous chemisorption of PAEs in mangrove sediments...
November 17, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30454987/a-novel-treatment-method-of-pvc-medical-waste-by-near-critical-methanol-dechlorination-and-additives-recovery
#12
Yingying Qi, Jiahuan He, Yifan Li, Xuan Yu, Fu-Rong Xiu, Yuehua Deng, Xiang Gao
Before PVC-medical waste is subjected to a waste-to-energy recovery process, the dechlorination and the recovery of additives such as plasticizer, stabilizer, and lubricant are quite important and attractive. In this work, a novel process was developed for the dechlorination and the recovery of additives from PVC-medical waste such as tube for transfusion (TFT) and sample collector for urine (SCFU) by using near-critical methanol (NCM). Reaction temperature, solid-to-liquid ratio, and reaction time have significant effect on the dechlorination of TFT and SCFU in NCM...
October 2018: Waste Management
https://www.readbyqxmd.com/read/30423997/excretion-of-urinary-metabolites-of-the-phthalate-esters-dep-and-dehp-in-16-volunteers-after-inhalation-and-dermal-exposure
#13
Annette M Krais, Christina Andersen, Axel C Eriksson, Eskil Johnsson, Jörn Nielsen, Joakim Pagels, Anders Gudmundsson, Christian H Lindh, Aneta Wierzbicka
Phthalate esters are suspected endocrine disruptors that are found in a wide range of applications. The aim of this study was to determine the excretion of urinary metabolites in 16 individuals after inhalation and/or dermal exposure to 100⁻300 µg/m³ of deuterium-labelled diethyl phthalate (D₄-DEP) and bis(2-ethylhexyl) phthalate (D₄-DEHP). Dermal exposure in this study represents a case with clean clothing acting as a barrier. After inhalation, D₄-DEP and D₄-DEHP metabolites were excreted rapidly, though inter-individual variation was high...
November 9, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/30408669/phthalic-acid-esters-disturbed-the-genetic-information-processing-and-improved-the-carbon-metabolism-in-black-soils
#14
Yimin You, Zhigang Wang, Weihui Xu, Chunlong Wang, Xiaosong Zhao, Yunpeng Su
Phthalic acid esters (PAEs), such as dimethyl phthalate (DMP) and dibutyl phthalate (DBP), are widely distributed as environmental pollutants. In this study, the effects of these chemicals were investigated in black soils using a metagenomics approach. The results clearly showed that DMP or DBP increased the abundance of genes involved in transcription, replication and repair in black soils. In addition, the abundances of genes associated with metabolic functions was improved following treatment with DMP or DBP, including those involved in lipid transport and metabolism, carbohydrate transport and metabolism, and energy production and conversion...
October 28, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/30407113/residue-levels-and-spatial-distribution-of-phthalate-acid-esters-in-water-and-sediment-from-urban-lakes-of-guangzhou-china
#15
Zhihong Zhang, Chao Zhang, Zehua Huang, XiaoHui Yi, Hui Zeng, Mingzhu Zhang, Mingzhi Huang
The residue levels and composition profiles of phthalate acid esters (PAEs) in water and sediment samples were investigated in eight urban lakes of Guangzhou, China. A total of 23 water and 16 sediment samples were collected. Results showed that all target PAEs were detected with dimethyl phthalate and di(2-ethylhexyl) phthalate as the most abundant compounds. The total concentrations of PAEs from different urban lakes were in the range of 273-1173 ng/L for water and 16.5-242 ng/g for sediments, with the geometric mean of 515 ng/L and 75...
November 8, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/30359902/a-preliminary-investigation-of-942-organic-micro-pollutants-in-the-atmosphere-in-waste-processing-and-urban-areas-northern-vietnam-levels-potential-sources-and-risk-assessment
#16
Hoang Quoc Anh, Keidai Tomioka, Nguyen Minh Tue, Le Huu Tuyen, Ngo Kim Chi, Tu Binh Minh, Pham Hung Viet, Shin Takahashi
Of 942 organic micro-pollutants screened, 167 compounds were detected at least once in the atmosphere in some primitive waste processing sites and an urban area in northern Vietnam by using a polyurethane foam-based passive air sampling (PUF-PAS) method and an Automated Identification and Quantification System with a Database (AIQS-DB) for GC-MS. Total concentrations of organic pollutants were higher in samples collected from an urban area of Hanoi city (2300-2600 ng m-3 ) as compared with those from an end-of-life vehicle (ELV) dismantling area in Bac Giang (900-1700 ng m-3 ) and a waste recycling cooperative in Thai Nguyen (870-1300 ng m-3 )...
October 22, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/30350139/rhog-elmo1-rac1-is-involved-in-phagocytosis-suppressed-by-mono-butyl-phthalate-in-tm4-cells
#17
Pan Gong, Shanshan Chen, Lulu Zhang, Yanhui Hu, Aihua Gu, Jingshu Zhang, Yubang Wang
Di-n-butyl phthalate (DBP) is one of the most dominant phthalate esters and is ubiquitous in the environment. Male reproductive toxicity of DBP and its active metabolite mono-butyl phthalate (MBP) has been demonstrated in in vivo and in vitro studies. The objective of this study was to explore the roles of RhoG-ELMO1-RAC1 in phagocytosis disrupted by MBP in TM4 cells. Mouse Sertoli cell lines (TM4 cells) were maintained and treated by various levels of MBP (1, 10, and 100 μM) for 24 h. Then, cells were harvested for further experiments...
October 22, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30343372/determination-of-selected-endocrine-disruptors-in-organic-free-range-and-battery-produced-hen-eggs-and-risk-assessment
#18
Ozgur Kuzukiran, Begum Yurdakok-Dikmen, Sedat Sevin, Ufuk Tansel Sireli, Guzin Iplikcioglu-Cil, Ayhan Filazi
An increasing amount of evidence suggests that phthalic acid esters (PAE), polychlorinated biphenyls (PCB), polybrominated diphenyl ethers (PBDE), and organochlorine pesticides (OCP) are related to mutagenic, carcinogenic, and endocrine disruptor effects (EDCs). These lipophilic compounds are highly resistant to breakdown processes, and consequently remain in the environment, followed by uptake into the food chain. Human exposure to lipophilic compounds results from the consumption of food containing EDCs, mainly foodstuffs of animal origin with a high fat content, since these contaminants accumulate in fatty tissues...
October 20, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30324366/a-theoretical-method-for-the-high-sensitivity-fluorescence-detection-of-paes-through-double-substitution-modification
#19
Youli Qiu, Yu Li
A highly sensitive method for the detection of phthalate acid ester (PAE) derivatives by fluorescence spectroscopy based on a double-substitution modification is reported. The fluorescence intensities of 18 PAE derivatives and the template PAEs after docking with the protein bovine serum albumin (BSA) are compared; the fluorescence intensities of the PAE derivatives increase significantly (28.20 to 110.00 times) with high sensitivities, but the functionalities (stability and insulation) are not affected. The persistence, mobility, and toxicity of the PAE derivatives are reduced by varying degrees, and their amounts of bioaccumulation are not significantly changed, indicating that the derivatives are more environmentally friendly...
December 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30292159/comparison-of-greenhouse-and-open-field-cultivations-across-china-soil-characteristics-contamination-and-microbial-diversity
#20
Jianteng Sun, Lili Pan, Zhiheng Li, Qingtao Zeng, Lingwen Wang, Lizhong Zhu
A national scale survey was conducted to determine an array of inorganic and organic contaminants in agricultural soils from two cultivation modes (greenhouse vs. open field) in 20 provinces across China. The investigated contaminants include organochlorine pesticides (OCPs), phthalate esters (PAEs), polycyclic aromatic hydrocarbons (PAHs), lead (Pb), zinc (Zn), copper (Cu) and cadmium (Cd). The large amounts of agrochemicals used and special cultivation mode in greenhouse caused substantial soil pollution and deterioration of soil quality...
December 2018: Environmental Pollution
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