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https://www.readbyqxmd.com/read/29048840/-determination-of-four-polycyclic-aromatic-hydrocarbons-in-olive-oil-by-high-performance-liquid-chromatography-fluorescent-detection
#1
Jiaying Zhao, Xiaomin Li, Xiaohua Lu, Qinghe Zhang, Weibing Zhang
A method for the determination of four polycyclic aromatic hydrocarbons (PAHs) such as benzo[a]anthracene, chrysene, benzo[b]fluoranthene and benzo[a]pyrene in olive oil by high performance liquid chromatography-fluorescent detection (HPLC-FLD) was developed. The olive oil samples were diluted with isopropanol and cleaned-up by a solid phase extraction cartridge with π-π specificity. Critical isomers were separated by gradient elution with water-acetonitrile on an Agilent ZORBAX Eclipse PAH column (100 mm×2...
July 8, 2017: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29048810/-simultaneous-determination-of-15-polycyclic-aromatic-hydrocarbons-in-cigarette-filter-by-gas-chromatography-tandem-mass-spectrometry
#2
Xiaotao Zhang, Li Zhang, Yibin Ruan, Weiwei Wang, Houwei Ji, Qiang Wan, Fucheng Lin, Jian Liu
A method for the simultaneous determination of 15 polycyclic aromatic hydrocarbons in cigarette filter was developed by isotope internal standard combined with gas chromatography-tandem mass spectrometry. The cigarette filters were extracted with dichloromethane, and the extract was filtered with 0.22 μm organic phase membrane. The samples were isolated by DB-5MS column (30 m×0.25 mm, 0.25 μm) and detected using multiple reaction monitoring mode of electron impact source under positive ion mode. The linearities of the 15 polycyclic aromatic hydrocarbons (acenapthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, ben[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenzo[a,h]anthracene, benzo[g,h,i]perylene and indeno[1,2,3-c,d]pyrene) were good, and the correlation coefficients (R(2)) ranged from 0...
October 8, 2017: Se Pu, Chinese Journal of Chromatography
https://www.readbyqxmd.com/read/29032526/micro-pollutants-in-sediment-samples-in-the-middle-danube-region-serbia-occurrence-and-risk-assessment
#3
Biljana D Škrbić, Kiwao Kadokami, Igor Antić, Grigorije Jovanović
This is the first comprehensive study on the occurrence of 940 semi-volatile organic compounds including sterols, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), pesticides, plasticizers, and other emerging compounds in 10 river and canal sediments collected in northern Serbia. For quantification of investigated compounds GC-MS-MS (selected reaction monitoring) and GC-MS (using both selected ion monitoring and total ion monitoring) methods were used. The number of detected compounds was in the range of 85-117, while the sum of the concentrations varied from 959 μg/kg dry-wt to 84,445 μg/kg dry-wt...
October 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29032441/characteristics-of-pahs-in-farmland-soil-and-rainfall-runoff-in-tianjin-china
#4
Rongguang Shi, Mengmeng Xu, Aifeng Liu, Yong Tian, Zongshan Zhao
Rainfall runoff can remove certain amounts of pollutants from contaminated farmland soil and result in a decline in water quality. However, the leaching behaviors of polycyclic aromatic hydrocarbons (PAHs) with rainfall have been rarely reported due to wide variations in the soil compositions, rainfall conditions, and sources of soil PAHs in complex farmland ecosystems. In this paper, the levels, spatial distributions, and composition profiles of PAHs in 30 farmland soil samples and 49 rainfall-runoff samples from the Tianjin region in 2012 were studied to investigate their leaching behaviors caused by rainfall runoff...
October 14, 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28989029/applications-of-high-resolution-recycling-liquid-chromatography-from-small-to-large-molecules
#5
Fabrice Gritti, Sebastien Besner, Sylvain Cormier, Martin Gilar
A twin-column recycling separation process (TCRSP) is assembled and used to generate higher speed and/or higher resolution levels than those of the usual non-recycling process at the same back pressure. It enables the users to solve very challenging separation problems caused by too small selectivity factors and/or too low column efficiencies. The relative gain in speed-resolution performance increases with increasing the number of cycles in the TCRSP, decreasing the maximum allowable pressure imposed by the LC system, decreasing the column permeability, and with reducing the separation speed...
September 25, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28980015/erratum-to-modelling-foetal-exposure-to-maternal-smoking-using-hepatoblasts-from-pluripotent-stem-cells
#6
Baltasar Lucendo-Villarin, Panagiotis Filis, Madeleine J Swortwood, Marilyn A Huestis, Jose Meseguer-Ripolles, Kate Cameron, John P Iredale, Peter J O'Shaughnessy, Paul A Fowler, David C Hay
During manuscript proofing, the following sentence was not deleted in the section "Results" at the end of the paragraph: "Both male and female hepatocytes responded in a similar fashion to cotinine, whereas male hepatocyte function was more sensitive to chrysene, fluorene and naphthalene than female hepatocytes".
October 3, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28965390/hetero-cu-iii-pd-ii-complex-of-a-dibenzo-g-p-chrysene-fused-bis-dicarbacorrole-with-stable-organic-radical-character
#7
Xian-Sheng Ke, Yongseok Hong, Peiyu Tu, Qing He, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
Bis-dicarbacorrole (bis-H3) with two adj-CCNN subunits was synthesized by incorporating a dibenzo[g,p]chrysene moiety into the macrocyclic structure. The two trianionic cores in bis-H3 can stabilize two Cu(III) ions (bis-Cu) or concurrently a Cu(III) cation and a Pd(II) ion in the form of a hetero bis-metal complex (mix-Cu/Pd). As prepared, mix-Cu/Pd displays organic π radical character, as confirmed by various techniques, including electron paramagnetic resonance spectroscopy, cyclic voltammetry, femtosecond transient absorption measurements, and DFT calculations...
October 12, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28922714/atmospheric-levels-and-cytotoxicity-of-polycyclic-aromatic-hydrocarbons-and-oxygenated-pahs-in-pm2-5-in-the-beijing-tianjin-hebei-region
#8
Xinyi Niu, Steven Sai Hang Ho, Kin Fai Ho, Yu Huang, Jian Sun, Qiyuan Wang, Yaqing Zhou, Zhuzi Zhao, Junji Cao
The chemical composition of PM2.5 and cellular effects from exposure to fine aerosol extracts were studied for samples collected in Beijing, Tianjin, Shijiazhuang, and Hengshui, China in winter 2015. Effects of priority polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (OPAHs) in PM2.5 on cell cultures were a major focus of the study. Total quantified PAHs and OPAHs at Shijiazhuang and Hengshui were higher than at Beijing and Tianjin, and benz(a)anthracene, chrysene and 1,8-naphthalic anhydride were the most abundant species...
September 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28910732/degradation-of-toxic-pahs-in-water-and-soil-using-potassium-zinc-hexacyanoferrate-nanocubes
#9
Uma Shanker, Vidhisha Jassal, Manviri Rani
Polycyclic aromatic hydrocarbons (PAHs) the ubiquitous, persistent and carcinogenic environmental contaminants have raised concern worldwide. Recently, their removal methodologies are advanced after exploring nanomaterials. Therefore, degradation of selected toxic PAHs (3-5 rings) using potassium zinc hexacyanoferrate (KZnHCF) nanocubes was studied. Highly crystalline and sharp KZnHCF nanocubes (∼100 nm) were obtained by green route using sapindus mukorossi. In both water and soil, anthracene and phenanthrene were degraded to maximum extent (80-93%), whereas, the degradation of fluorene, chrysene and benzo (a) pyrene were ∼70-80%...
December 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28894870/rate-constants-for-h-abstraction-from-benzo-a-pyrene-and-chrysene-a-theoretical-study
#10
A S Semenikhin, A S Savchenkova, I V Chechet, S G Matveev, Z Liu, M Frenklach, A M Mebel
Density functional B3LYP/6-31G(d) and ab initio G3(MP2,CC) calculations have been carried out to determine thermal rate constants of direct H abstraction reactions from four- and five-ring polycyclic aromatic hydrocarbons (PAH) chrysene and benzo[a]pyrene by various radicals abundant in combustion flames, such as H, CH3, C3H3, and OH, using transition state theory. The results show that the H abstraction reactions with OH have the lowest barriers of ∼4 kcal mol(-1), followed by those with H and CH3 with barriers of 16-17 kcal mol(-1), and then with propargyl radicals with barriers of 24-26 kcal mol(-1)...
September 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28844711/novel-flexible-heteroarotinoid-sl-1-18-promotes-er%C3%AE-degradation-to-inhibit-breast-cancer-cell-growth
#11
Maryam M Fallatah, Shengquan Liu, Mary B Sevigny, Hongye Zou, Maggie C Louie
SL-1-18 (1-(chrysen-6-yl)-3-(4-nitrophenyl)thiourea) is new flexible heteroarotinoid (Flex-Het) analog derived from the parent compound, SHetA2, and our previous study showed comparable activity to SHetA2 in terms of inhibiting ER+ breast cancer cell growth. This current study aims to determine the molecular mechanism underlying SL-1-18's effect on breast cancer cell growth. Our results indicate that SL-1-18 inhibits cell proliferation of ER+ breast cancer cells (MCF-7 and T-47D) by preventing cell cycle progression...
August 25, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28834568/methylated-pahs-and-or-their-metabolites-are-important-contributors-to-the-overall-estrogenic-activity-of-pah-contaminated-soils
#12
Monika M Lam, Magnus Engwall, Michael S Denison, Maria Larsson
In this study 42 polycyclic aromatic compounds (PACs) were investigated for their estrogenic potential using the VM7Luc4E2 transactivation assay (VM7Luc4E2-TA). Relative potencies (REPs) were determined for mass-balance analysis. In addition, compounds were tested in combination with the estrogen receptor (ER) antagonist ICI182,780 (ICI) and the Ah receptor (AhR) antagonist/CYP1A1 inhibitor α-naphthoflavone (α-NF). Luciferase induction and CYP1A1-dependent EROD-activity were measured to assess if the estrogenic activity was elicited by the compound itself and/or by its metabolites...
August 23, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28806681/human-biomonitoring-of-polycyclic-aromatic-hydrocarbonsand-metals-in-the-general-population-residing-near-the-municipal-solid-waste-incinerator-of-modena-italy
#13
Maria Giulia Gatti, Petra Bechtold, Laura Campo, Giovanna Barbieri, Giulia Quattrini, Andrea Ranzi, Sabrina Sucato, Luca Olgiati, Elisa Polledri, Michael Romolo, Laura Iacuzio, Giuliano Carrozzi, Paolo Lauriola, Carlo A Goldoni, Silvia Fustinoni
BACKGROUND AND OBJECTIVES: A cross-sectional biomonitoring study was carried out to investigate exposure to incinerator emission in relation to the body burden of selected biomarkers in the population living around the plant. METHODS: Approximately 500 people, aged 18-69 yrs, living within 4 km from the incinerator were randomly selected form the population register. Exposure was measured through fall-out maps of particulate matter (PM), used as tracer for incinerator emissions...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28798500/studying-the-effects-of-two-various-methods-of-composting-on-the-degradation-levels-of-polycyclic-aromatic-hydrocarbons-pahs-in-sewage-sludge
#14
Joanna Poluszyńska, Elżbieta Jarosz-Krzemińska, Edeltrauda Helios-Rybicka
The research comprised of studying the effect composting sewage sludge with sawdust and vermicomposting with earthworm Eisenia fetida has on the degradation of 16 polycyclic aromatic hydrocarbons (PAHs). Raw rural sewage sludge prior composting was more contaminated with PAHs than urban sewage sludge, in both cases exceeding EU cutoff limits of 6 mg/kg established for land application. Dibenzo[a,h]anthracene (DBahAnt), acenaphtylene (Acy) and indeno[1,2,3-c,d]pyrene (IPyr) were predominant in rural sewage sludge, whilst the urban sewage sludge contained the highest concentrations of benzo[b]fluoranthene (BbFl), benzo[k]fluoranthene (BkFl) and indeno[1,2,3-c,d]pyrene (IPyr)...
2017: Water, Air, and Soil Pollution
https://www.readbyqxmd.com/read/28783190/endocrine-disrupting-potential-of-pahs-and-their-alkylated-analogues-associated-with-oil-spills
#15
Sangwoo Lee, Seongjin Hong, Xiaoshan Liu, Cheolmin Kim, Dawoon Jung, Un Hyuk Yim, Won Joon Shim, Jong Seong Khim, John P Giesy, Kyungho Choi
Polycyclic aromatic hydrocarbons (PAHs) and alkylated PAHs are known to be major toxic contaminants in spills of petroleum hydrocarbons (oil). Spilled oil undergoes weathering and over time, PAHs go through a series of compositional changes. PAHs can disrupt endocrine functions, and the type of functions affected and associated potencies vary with the type and alkylation status of PAH. In this study, the potential of five major PAHs of crude oil, i.e., naphthalene, fluorene, dibenzothiophene, phenanthrene, and chrysene, and their alkylated analogues (n = 25), to disrupt endocrine functions was evaluated by use of MVLN-luc and H295R cell lines...
September 20, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28772181/biomonitoring-status-and-source-risk-assessment-of-polycyclic-aromatic-hydrocarbons-pahs-using-honeybees-pine-tree-leaves-and-propolis
#16
Navid Kargar, Golnar Matin, Amir Abbas Matin, Hasan Baha Buyukisik
In this study, to identify and quantify the sources of airborne polycyclic aromatic hydrocarbons (PAHs), we gathered honeybee, pine tree leaf, and propolis samples to serve as bioindicators from five stations in the village of "Bozkoy" in the Aliaga industrial district of Izmir (Turkey) during April-May 2014. The PAH concentrations which measured by gas chromatography (GC) varied from 261.18 to 553.33 μg kg(-1) dry weight (dw) in honeybee samples, 138.57-853.67 μg kg(-1) dw in pine leaf samples, and 798...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28738571/determination-of-polycyclic-aromatic-hydrocarbons-in-infant-formula-using-solid-state-urea-clathrate-formation-with-gas-chromatography-tandem-mass-spectrometry
#17
Zoltán Nyiri, Márton Novák, Zsolt Bodai, Noémi Petrovics, Zsuzsanna Eke
An analytical method has been developed for the quantitative determination of the 16 EU priority polycyclic aromatic hydrocarbons (PAHs) in infant formula. Prior to analysis infant formula is subjected to sample preparation including the extraction of PAHs from the sample, transesterification of the triglyceride content of the extract to fatty acid methyl esters (FAMEs), and solid state urea clathrate formation to remove the FAMEs. Measurements were carried out with gas chromatography - tandem mass spectrometry...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28730822/distributions-of-polycyclic-aromatic-hydrocarbons-aromatic-ketones-carboxylic-acids-and-trace-metals-in-arctic-aerosols-long-range-atmospheric-transport-photochemical-degradation-production-at-polar-sunrise
#18
Dharmendra Kumar Singh, Kimitaka Kawamura, Ayako Yanase, Leonard A Barrie
The distributions, correlations, and source apportionment of aromatic acids, aromatic ketones, polycyclic aromatic hydrocarbons (PAHs), and trace metals were studied in Canadian high Arctic aerosols. Nineteen PAHs including minor sulfur-containing heterocyclic PAH (dibenzothiophene) and major 6 carcinogenic PAHs were detected with a high proportion of fluoranthene followed by benzo[k]fluoranthene, pyrene, and chrysene. However, in the sunlit period of spring, their concentrations significantly declined likely due to photochemical decomposition...
August 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28702489/data-on-the-effect-of-in-utero-exposure-to-polycyclic-aromatic-hydrocarbons-on-genome-wide-patterns-of-dna-methylation-in-lung-tissues
#19
Trevor J Fish, Abby D Benninghoff
Data in this article depict patterns of methylation in lung tissues obtained from the offspring of B6129SF1/J dams and 129S1/SvImJ sires exposed in utero to benzo[a]pyrene (BaP) or dibenzo[def,p]chrysene (DBC) as compared to non-exposed offspring. Genome-wide methylation of lung tumors in adult offspring was determined using methylated DNA immunoprecipitation (MeDIP) with the NimbleGen mouse DNA methylation CpG island array. This data article refers to the research article "DNA methylation in lung tissues of mouse offspring exposed in utero to polycyclic aromatic hydrocarbons," [1] in which comprehensive data interpretation and analysis are provided...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28662424/appraisement-source-apportionment-and-health-risk-of-polycyclic-aromatic-hydrocarbons-pahs-in-vehicle-wash-wastewater-pakistan
#20
Zahir Qamar, Sardar Khan, Anwarzeb Khan, Muhammad Aamir, Javed Nawab, Muhammad Waqas
Vehicle-wash wastewater (VWW) contains elevated concentrations of different petrochemicals including polycyclic aromatic hydrocarbons (PAHs), a carcinogenic group of organic compounds. This study investigates the discharge of PAHs present in the untreated wastewater of vehicle-wash stations (VWS) located in district Peshawar, Pakistan. The data obtained was being novel with the detection of 16 USEPA PAHs (both individuals and total) and compared with earlier studies and international standards. The ∑16PAHs in wastewater from light vehicle-wash stations (LVWS) and heavy vehicle-wash stations (HVWS) ranged from 245-429μg/l and 957-1582μg/l, respectively...
December 15, 2017: Science of the Total Environment
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