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Chrysene

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https://www.readbyqxmd.com/read/29457900/three-dimensional-structures-based-on-the-fusion-of-chrysene-and-spirobifluorene-chromophores-for-the-development-of-blue-oleds
#1
Hayoon Lee, Hyocheol Jung, Seokwoo Kang, Jin Hyuck Heo, Sang Hyuk Im, Jongwook Park
A new deep-blue chromophore containing a three-dimensionally (3D) shaped CS core composed of fused chrysene and spirofluorene units is synthesized. A pair of m-terphenyl (TP) units is also substituted onto the CS core, at two different sets of positions to form two additional compounds: CS-TPTP and TP-CS-TP. The TP-CS-TP compound showed the highest efficiency with an external quantum efficiency (EQE) of 3.05%, and Commission Internationale de L'Eclairage coordinates (CIE) of (0.148, 0.098) corresponding to the emission of blue light...
February 19, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29426135/phthalates-and-polycyclic-aromatic-hydrocarbons-pahs-in-the-indoor-settled-carpet-dust-of-mosques-health-risk-assessment-for-public
#2
Mohammad W Kadi, Nadeem Ali, Hussain Mohammed Salem Ali Albar
A number of studies have reported the occurrence of phthalates and polycyclic aromatic hydrocarbons (PAHs) in indoor settled dust from different occupational and residential settings around the world but limited studies are available from public and religious places. In recent decades Kingdom of Saudi Arabia (KSA) has experienced tremendous industrial growth especially in the petroleum industries, and as result environmental issues related with such industries have also increased but scientific data is still scarce to understand the impact on public health...
January 29, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29410274/polycyclic-aromatic-hydrocarbons-pahs-skin-permeation-rates-change-with-simultaneous-exposures-to-solar-ultraviolet-radiation-uv-s
#3
Nancy B Hopf, Philipp Spring, Nathalie Hirt-Burri, Silvia Jimenez, Benjamin Sutter, David Vernez, Aurelie Berthet
Road construction workers are simultaneously exposed to two carcinogens; solar ultraviolet (UV-S) radiation and polycyclic aromatic hydrocarbons (PAHs) in bitumen emissions. The combined exposure may lead to photogenotoxicity and enhanced PAH skin permeation rates. Skin permeation rates (J) for selected PAHs in a mixture (PAH-mix) or in bitumen fume condensate (BFC) with and without UV-S co-exposures were measured with in vitro flow-through diffusion cells mounted with human viable skin and results compared...
February 1, 2018: Toxicology Letters
https://www.readbyqxmd.com/read/29310872/carbon-nanotube-based-benzyl-polymethacrylate-composite-monolith-as-a-solid-phase-extraction-adsorbent-and-a-stationary-phase-material-for-simultaneous-extraction-and-analysis-of-polycyclic-aromatic-hydrocarbon-in-water
#4
Asma'a Al-Rifai, Ahmad Aqel, Lamya Al Wahibi, Zeid A ALOthman, Ahmed-Yacine Badjah-Hadj-Ahmed
A composite of multi-walled carbon nanotubes incorporated into a benzyl methacrylate-co-ethylene dimethacrylate porous monolith was prepared, characterized and used as solid phase adsorbent and as stationary phase for simultaneous extraction and separation of ten polycyclic aromatic hydrocarbons, followed by nano-liquid chromatography analysis. The extraction and chromatographic parameters were optimized with regard to the extraction efficiency and the quality of chromatographic analytes separation. Under the optimized conditions, all PAHs were separated in 13 min with suitable resolution values (Rs = 1...
January 4, 2018: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29287444/polycyclic-aromatic-hydrocarbons-content-and-fatty-acids-profile-in-coconut-safflower-evening-primrose-and-linseed-oils
#5
Simone Alves da Silva, Elizabeth A F da Silva Torres, Adriana Palma de Almeida, Geni Rodrigues Sampaio
This study aimed at evaluating the polycyclic aromatic hydrocarbons (PAHs) contamination of commercial vegetable oils and examined the identity through the fatty acids profiles. Coconut, safflower, evening primrose, and linseed oils marketed in São Paulo (Brazil) were investigated totaling 69 samples. Four PAHs, benzo[a]anthracene (BaA), chrysene (Chr), benzo[b]fluoranthene (BbF), and benzo[a]pyrene (BaP), were detected in 96% of the samples at individual levels ranging from not detected to 14.99 μg kg-1...
April 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29283369/contamination-of-tea-and-tea-infusion-with-polycyclic-aromatic-hydrocarbons
#6
Alicja Zachara, Dorota Gałkowska, Lesław Juszczak
The aim of this work was to validate the method of determination of polycyclic aromatic hydrocarbons (PAHs), i.e., benzo(a)pyrene and sum of benzo(a)pyrene, benz(a)anthracene, benzo(b)fluoranthene and chrysene in different types of tea, as well as to assess the transfer of these contaminants from tea to tea infusion. The research materials were popular types of black, green, red and white tea. Quantitative and qualitative determination of PAHs was performed by High Performance Liquid Chromatography with fluorimetric detection (HPLC-FLD)...
December 28, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29218577/street-foods-exacerbate-effects-of-the-environmental-burden-of-polycyclic-aromatic-hydrocarbons-pahs-in-nigeria
#7
Osazuwa Clinton Ekhator, Nnaemeka Arinze Udowelle, Sorbari Igbiri, Rose Ngozi Asomugha, Chiara Frazzoli, Orish Ebere Orisakwe
Polycyclic aromatic hydrocarbons (PAHs) are a large group of well-known toxicants with carcinogenic potential and other health effects including on the immune system. The high health risks of non-communicable diseases and relevant comorbidities in Africa, particularly in contaminated areas like e-waste and crude oil and gas exploration areas and for high consumers of food commodity groupings which are most critical for PAH exposure, are exacerbated by dietary exposure due to unsafe practices in commonly consumed foods, like those street vended...
December 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29204943/occurrence-distribution-and-composition-of-aliphatic-and-polycyclic-aromatic-hydrocarbons-in-sediment-cores-from-the-lower-fox-river-wisconsin-us
#8
Chase S Brewster, Virender K Sharma, Leslie Cizmas, Thomas J McDonald
The Lower Fox River is a 39 mile section which supports approximately 270,000 rural inhabitants across 18 counties, 303,000 metropolitan residents in Green Bay and Appleton, Wisconsin, and several large industrial complexes such as paper mills and power plants. This paper presents the distribution and concentrations of aliphatic (n-alkanes) and aromatic hydrocarbons (polycyclic aromatic hydrocarbons [PAHs]) as well as total organic carbon (TOC) in the Lower Fox River to identify the sources of hydrocarbon contamination...
December 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29198025/characteristics-of-polycyclic-aromatic-hydrocarbons-in-pm2-5-emitted-from-different-cooking-activities-in-china
#9
Yun-Chun Li, Jia-Qian Qiu, Man Shu, Steven Sai Hang Ho, Jun-Ji Cao, Ge-Hui Wang, Xian-Xiang Wang, Xiao-Qing Zhao
Nineteen polycyclic aromatic hydrocarbons (PAHs) in PM2.5 emitted from five different cooking activities were characterized, and their influencing factors were determined. The total quantified particle-bounded PAH concentrations (ΣPAHs) in the airs from the cooking activities were 4.2-36.5-fold higher than those in corresponding backgrounds. The highest ΣPAHs were seen in cafeteria frying (783 ± 499 ng/m3), followed by meat roasting (420 ± 191 ng/m3), fish roasting (210 ± 105 ng/m3), snack-street boiling (202 ± 230 ng/m3), and cafeteria boiling (150 ± 65 ng/m3)...
December 2, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29126482/identification-of-new-tetrahydroxylated-metabolites-of-polycyclic-aromatic-hydrocarbons-in-hair-as-biomarkers-of-exposure-and-signature-of-dna-adduct-levels
#10
Nathalie Grova, Jean-Philippe Antignac, Emilie M Hardy, Fabrice Monteau, Karine Pouponneau, Bruno Le Bizec, Brice M R Appenzeller
The present study addresses the hypothesis that the concentration of tetrahydroxylated Polycylic Aromatic Hydrocarbons (tetra-OH-PAHs) in hair might be a useful biomarker of human exposure to PAHs, providing quantitative assessment of the internal dose, as well as information on the associated toxicity in relation to individual's specific metabolism. By means of animal models, this work aimed at identifying new tetra-OH-PAHs which can be released from the hydrolysis of DNA-adducts and can also be directly detected in biological matrices usually used in the field of biomonitoring such as hair and urine...
December 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29102061/on-line-generation-of-third-order-liquid-chromatography-excitation-emission-fluorescence-matrix-data-quantitation-of-heavy-polycyclic-aromatic-hydrocarbons
#11
Maira D Carabajal, Juan A Arancibia, Graciela M Escandar
For the first time, third-order liquid chromatography with excitation-emission fluorescence matrix detection (LC-EEFM) data were generated on-line and chemometrically processed for the simultaneous quantitation of the heavy-polycyclic aromatic hydrocarbons fluoranthene, pyrene, benz[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, and dibenz[a,h]anthracene. The applied experimental strategy is very simple, and is based on the reduction of the linear flow rate by fitting a larger diameter connecting-tube between the column outlet and the fluorimetric detector...
October 24, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29082631/comment-on-negative-ions-molecular-electron-affinity-and-orbital-structure-of-cata-condensed-polycyclic-aromatic-hydrocarbons-by-rustem-v-khatymov-mars-v-muftakhov-pavel-v-shchukin
#12
Edward S Chen, Edward C M Chen
RATIONALE: The anion mass spectral lifetimes for several aromatic hydrocarbons reported in the subject article were related to significantly different electron affinities. The different values are rationalized using negative ion mass spectral data. METHODS: Electron affinities for polycyclic aromatic hydrocarbons are reported from the temperature dependence of unpublished electron capture detector data. These are compared with published values and the largest values are assigned to the ground state...
October 29, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/29073177/hypomethylated-fgf3-is-a-potential-biomarker-for-early-detection-of-oral-cancer-in-mice-treated-with-the-tobacco-carcinogen-dibenzo-def-p-chrysene
#13
Yuan-Wan Sun, Kun-Ming Chen, Yuka Imamura Kawasawa, Anna C Salzberg, Timothy K Cooper, Carla Caruso, Cesar Aliaga, Junjia Zhu, Krishne Gowda, Shantu Amin, Karam El-Bayoumy
Genetic and epigenetic alterations observed at end stage OSCC formation could be considered as a consequence of cancer development and thus changes in normal or premalignant tissues which had been exposed to oral carcinogens such as Dibenzo[def,p]chrysene (DBP) may better serve as predictive biomarkers of disease development. Many types of DNA damage can induce epigenetic changes which can occur early and in the absence of evident morphological abnormalities. Therefore we used ERRBS to generate genome-scale, single-base resolution DNA methylomes from histologically normal oral tissues of mice treated with DBP under experimental conditions known to induce maximum DNA damage which is essential for the development of OSCC induced by DBP in mice...
2017: PloS One
https://www.readbyqxmd.com/read/29048840/-determination-of-four-polycyclic-aromatic-hydrocarbons-in-olive-oil-by-high-performance-liquid-chromatography-fluorescent-detection
#14
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
#15
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
#16
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
#17
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
#18
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...
November 17, 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
#19
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
#20
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
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