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[PMID]:29273907
[Au] Autor:Ghiasvand AR; Nouriasl K; Yazdankhah F
[Ad] Endereço:Department of Chemistry, Lorestan University, Khoramabad, Lorestan Province, 6713817133, Iran. a_ghiasvand@yahoo.com.
[Ti] Título:Comparison of the atmospheric- and reduced-pressure HS-SPME strategies for analysis of residual solvents in commercial antibiotics using a steel fiber coated with a multiwalled carbon nanotube/polyaniline nanocomposite.
[So] Source:Anal Bioanal Chem;410(2):361-371, 2018 Jan.
[Is] ISSN:1618-2650
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:A low-cost, sensitive and reliable reduced-pressure headspace solid-phase microextraction (HS-SPME) setup was developed and evaluated for direct extraction of residual solvents in commercial antibiotics, followed by determination by gas chromatography with flame ionization detection (GC-FID). A stainless steel narrow wire was made porous and adhesive by platinization by a modified electrophoretic deposition method and coated with a polyaniline/multiwalled carbon nanotube nanocomposite. All experimental variables affecting the extraction efficiency were investigated for both atmospheric-pressure and reduced-pressure conditions. Comparison of the optimal experimental conditions and the results demonstrated that the reduced-pressure strategy leads to a remarkable increase in the extraction efficiency and reduction of the extraction time and temperature (10 min, 25 °Ï¹ vs 20 min, 40 °Ï¹). Additionally, the reduced-pressure strategy showed better analytical performances compared with those obtained by the conventional HS-SPME-GC-FID method. Limit of detections, linear dynamic ranges, and relative standard deviations of the reduced-pressure HS-SPME procedure for benzene, toluene, ethylbenzene, and xylene (BTEX) in injectable solid drugs were obtained over the ranges of 20-100 pg g , 0.02-40 µg g , and 2.8-10.2%, respectively. The procedure developed was successful for the analysis of BTEX in commercial containers of penicillin, ampicillin, ceftriaxone, and cefazolin. Graphical abstract Schematic representation of the developed RP-HS-SPME setup.
[Mh] Termos MeSH primário: Compostos de Anilina/química
Antibacterianos/análise
Nanocompostos/química
Nanotubos de Carbono/química
Microextração em Fase Sólida/instrumentação
Solventes/análise
Xilenos/análise
[Mh] Termos MeSH secundário: Pressão Atmosférica
Contaminação de Medicamentos
Desenho de Equipamento
Nanocompostos/ultraestrutura
Nanotubos de Carbono/ultraestrutura
Solventes/isolamento & purificação
Aço/química
Xilenos/isolamento & purificação
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aniline Compounds); 0 (Anti-Bacterial Agents); 0 (Nanotubes, Carbon); 0 (Solvents); 0 (Xylenes); 0 (polyaniline); 12597-69-2 (Steel)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171224
[St] Status:MEDLINE
[do] DOI:10.1007/s00216-017-0726-7


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[PMID]:28278766
[Au] Autor:Wu C; Xu P; Xu B; Li W; Li S; Wang X
[Ad] Endereço:a Key Laboratory of Biomass Chemical Engineering of Ministry of Education , Institute of Industrial Ecology and Environment, College of Chemical and Biological Engineering, Zhejiang University (Yuquan Campus) , Hangzhou , People's Republic of China.
[Ti] Título:o-Xylene removal using one- and two-phase partitioning biotrickling filters: steady/transient-state performance and microbial community.
[So] Source:Environ Technol;39(1):109-119, 2018 Jan.
[Is] ISSN:0959-3330
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, one- and two-phase partitioning biotrickling filters (1P-BTF and 2P-BTF, respectively) inoculated with a pre-acclimated mixed culture were examined for the removal of hydrophobic and refractory o-xylene. A small fraction of silicone oil (5% v/v) was added as a non-aqueous phase. Due to the presence of silicone oil, the 2P-BTF exhibited superior performance and stability for o-xylene biodegradation at steady and transient operations. Higher macro-kinetic constants for o-xylene removal by the Michaelis-Menten model were obtained for the 2P-BTF with a saturation constant of 0.396 g m and a maximum elimination capacity of 105.7 g m h . The enhancement of removal performance for the 2P-BTF was supported by dominant specialized microorganisms with o-xylene biodegradability. The diversity of microbial community was influenced by the presence of silicone oil. This study demonstrated that a BTF with 5% of silicone oil could be applied for the treatment of hydrophobic and refractory volatile organic compounds. It also provided valuable information for better understanding the relationship between microbial community and removal performance using two-phase partitioning bioreactors.
[Mh] Termos MeSH primário: Reatores Biológicos/microbiologia
Filtração/métodos
Eliminação de Resíduos Líquidos/métodos
Xilenos/análise
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Xilenos/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Xylenes)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170311
[St] Status:MEDLINE
[do] DOI:10.1080/09593330.2017.1296892


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[PMID]:28992483
[Au] Autor:Ma J; Yang Y; Jiang X; Xie Z; Li X; Chen C; Chen H
[Ad] Endereço:State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China. Electronic address: rubpmj@sina.com.
[Ti] Título:Impacts of inorganic anions and natural organic matter on thermally activated persulfate oxidation of BTEX in water.
[So] Source:Chemosphere;190:296-306, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present study investigated the impacts of water matrix constituents (CO , HCO , Cl , Br , PO , HPO , H PO , NO , SO and natural organic matters (NOM) on the oxidation of a mixture of benzene, toluene, ethylbenzene, and xylenes (BTEX) by thermally activated persulfate (PS). In the absence of matrix constituents, the BTEX oxidation rates decreased in the following order: xylenes > toluene ≈ ethylbenzene > benzene. HCO /CO and NOM inhibited the BTEX oxidation and the inhibiting effects became more pronounced as the HCO /CO /NOM concentration increased. SO , NO , PO and H PO did not affect the BTEX oxidation while HPO slightly inhibited the reaction. The impacts of Cl and Br were complex. Cl inhibited the benzene oxidation while 100 mM and 500 mM of Cl promoted the oxidation of m-xylene and p-xylene. Br completely suppressed the benzene oxidation while 500 mM of Br strongly promoted the oxidation of xylenes. Detailed explanations on the influence of each matrix constituent were discussed. In addition, various halogenated degradation byproducts were detected in the treatments containing Cl and Br . Overall, this study indicates that some matrix constituents such as NOM, HCO , CO , H PO , Cl and Br may reduce the BTEX removal efficiency of sulfate radical-based advanced oxidation process (SR-AOP) and the presence of Cl and Br may even lead to the formation of toxic halogenated byproducts.
[Mh] Termos MeSH primário: Derivados de Benzeno/química
Benzeno/química
Sulfatos/química
Tolueno/química
Água/química
Xilenos/química
[Mh] Termos MeSH secundário: Substâncias Húmicas
Compostos Inorgânicos/farmacologia
Íons
Cinética
Oxirredução
Poluentes Químicos da Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzene Derivatives); 0 (Humic Substances); 0 (Inorganic Chemicals); 0 (Ions); 0 (Sulfates); 0 (Water Pollutants, Chemical); 0 (Xylenes); 0 (sulfate radical); 059QF0KO0R (Water); 3FPU23BG52 (Toluene); J64922108F (Benzene); L5I45M5G0O (ethylbenzene)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180214
[Lr] Data última revisão:
180214
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171010
[St] Status:MEDLINE


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[PMID]:28917820
[Au] Autor:Ma P; Zhang P; Shu J; Yang B; Zhang H
[Ad] Endereço:State Key Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
[Ti] Título:Characterization of secondary organic aerosol from photo-oxidation of gasoline exhaust and specific sources of major components.
[So] Source:Environ Pollut;232:65-72, 2018 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:To further explore the composition and distribution of secondary organic aerosol (SOA) components from the photo-oxidation of light aromatic precursors (toluene, m-xylene, and 1,3,5-trimethylbenzene (1,3,5-TMB)) and idling gasoline exhaust, a vacuum ultraviolet photoionization mass spectrometer (VUV-PIMS) was employed. Peaks of the molecular ions of the SOA components with minimum molecular fragmentation were clearly observed from the mass spectra of SOA, through the application of soft ionization methods in VUV-PIMS. The experiments comparing the exhaust-SOA and light aromatic mixture-SOA showed that the observed distributions of almost all the predominant cluster ions in the exhaust-SOA were similar to that of the mixture-SOA. Based on the characterization experiments of SOA formed from individual light aromatic precursors, the SOA components with molecular weights of 98 and 110 amu observed in the exhaust-SOA resulted from the photo-oxidation of toluene and m-xylene; the components with a molecular weight of 124 amu were derived mainly from m-xylene; and the components with molecular weights of 100, 112, 128, 138, and 156 amu were mainly derived from 1,3,5-TMB. These results suggest that C -C light aromatic hydrocarbons are significant SOA precursors and that major SOA components originate from gasoline exhaust. Additionally, some new light aromatic hydrocarbon-SOA components were observed for the first time using VUV-PIMS. The corresponding reaction mechanisms were also proposed in this study to enrich the knowledge base of the formation mechanisms of light aromatic hydrocarbon-SOA compounds.
[Mh] Termos MeSH primário: Aerossóis/análise
Gasolina/análise
Processos Fotoquímicos
Emissões de Veículos/análise
[Mh] Termos MeSH secundário: Hidrocarbonetos Aromáticos
Espectrometria de Massas
Peso Molecular
Oxirredução
Tolueno
Xilenos/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aerosols); 0 (Gasoline); 0 (Hydrocarbons, Aromatic); 0 (Vehicle Emissions); 0 (Xylenes); 3FPU23BG52 (Toluene); O9XS864HTE (3-xylene)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180208
[Lr] Data última revisão:
180208
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170918
[St] Status:MEDLINE


  5 / 3422 MEDLINE  
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[PMID]:28465033
[Au] Autor:Kim JI; Noh JY; Kim M; Park JM; Song HW; Kang MJ; Pyun JC
[Ad] Endereço:Department of Materials Sciences and Engineering, Yonsei University, Seoul, South Korea.
[Ti] Título:Newborn screening by matrix-assisted laser desorption/ionization mass spectrometry based on parylene-matrix chip.
[So] Source:Anal Biochem;530:31-39, 2017 08 01.
[Is] ISSN:1096-0309
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Newborn screening for diagnosis of phenylketonuria, homocystinuria, and maple syrup urine disease have been conducted by analyzing the concentration of target amino acids using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF MS) based on parylene-matrix chip. Parylene-matrix chip was applied to MALDI-ToF MS analysis reducing the matrix peaks significantly at low mass-to-charge ratio range (m/z < 500). Reproducibility of inter-spot and intra-spot analyses of amino acids was less than 10%. Methanol extraction was adopted for simple and rapid sample preparation of serum before mass spectrometric analysis showing 13.3 to 45% of extraction efficiency. Calibration curves for diagnosis of neonatal metabolic disorders were obtained by analyzing methanol-extracted serum spiked with target amino acids using MALDI-ToF MS. They showed good linearity (R > 0.98) and the LODs were ranging from 9.0 to 22.9 µg/mL. Effect of proteins in serum was estimated by comparing MALDI-ToF mass spectra of amino acids-spiked serum before and after the methanol extraction. Interference of other amino acids on analysis of target analyte was determined to be insignificant. From these results, MALDI-ToF MS based on parylene-matrix chip could be applicable to medical diagnosis of neonatal metabolic disorders.
[Mh] Termos MeSH primário: Aminoácidos/sangue
Triagem Neonatal/métodos
Polímeros/química
Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz/métodos
Xilenos/química
[Mh] Termos MeSH secundário: Aminoácidos/química
Seres Humanos
Recém-Nascido
Limite de Detecção
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Amino Acids); 0 (Polymers); 0 (Xylenes); 25722-33-2 (parylene)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:180207
[Lr] Data última revisão:
180207
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170504
[St] Status:MEDLINE


  6 / 3422 MEDLINE  
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[PMID]:28780260
[Au] Autor:Padhi SK; Gokhale S
[Ad] Endereço:Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India.
[Ti] Título:Treatment of gaseous volatile organic compounds using a rotating biological filter.
[So] Source:Bioresour Technol;244(Pt 1):270-280, 2017 Nov.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Rotating biological filter (RBF), which provides higher oxygen mass transfer has been developed for treating gaseous volatile organic compounds (VOCs) such as BTEX (Benzene, toluene, ethylbenzene and xylene) at higher concentrations. The screening of enriched cultures has been done initially to enhance the performance of RBF for treating xylene, toluene and xylene, and BTEX at various loading rates. The removal efficiency of BTEX was maximum (82%), higher than toluene and xylene (79%), and xylene (72%). The presence of xylene enhanced the removal of toluene in the mixture. In the BTEX, toluene was found to be highly biodegradable followed by ethylbenzene, benzene and xylene. The RBF also removed nutrients from wastewater along with VOCs. The stability study of RBF showed that supply of nutrient media influenced the RBF performance more. Further, the predominant strain identified in the mixed culture was Enterobacter cloacae SP4001, responsible for biodegradation of BTEX.
[Mh] Termos MeSH primário: Biodegradação Ambiental
Compostos Orgânicos Voláteis
[Mh] Termos MeSH secundário: Benzeno
Derivados de Benzeno
Gases
Tolueno
Xilenos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzene Derivatives); 0 (Gases); 0 (Volatile Organic Compounds); 0 (Xylenes); 3FPU23BG52 (Toluene); J64922108F (Benzene)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171103
[Lr] Data última revisão:
171103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170807
[St] Status:MEDLINE


  7 / 3422 MEDLINE  
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[PMID]:28779601
[Au] Autor:Yang Y; Li J; Xi B; Wang Y; Tang J; Wang Y; Zhao C
[Ad] Endereço:School of Environment, Beijing Normal University, Beijing, 100875, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
[Ti] Título:Modeling BTEX migration with soil vapor extraction remediation under low-temperature conditions.
[So] Source:J Environ Manage;203(Pt 1):114-122, 2017 Dec 01.
[Is] ISSN:1095-8630
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Contaminant spills in vadose zone are frequently encountered in winter, and the temperature at such times is often under 0 °C. Soil vapor extraction (SVE) is typically effective for the removal of volatile contaminants from vadose zone, but temperature influences its effectiveness. A sandbox laboratory evaluation and a TMVOC numerical model were used to investigate BTEX migration that occurred during SVE remediation processes under low temperatures. The simulation results were consistent with the experimental data obtained in the present study, and the following three conclusions were drawn. (i) The SVE removal rates of benzene, toluene, ethylbenzene, and o-xylene were 89.8%, 71.3%, 29.7%, and 14.4%, respectively. (ii) In two extraction processes, the masses of benzene and toluene in the gas-aqueous-NAPL phases decreased by approximately 20%:70%:10%, with the greatest reduction occurring in the aqueous phase. During the period between these two extraction processes, benzene and toluene migrated from the NAPL phase to the gas and aqueous phases, and their fractions were approximately 30%:70%. (iii) The results proved that under low-temperature conditions, namely -10-5 °C, the SVE removal ratio for benzene was highest among the four tested contaminants. It was therefore determined that TMVOC can provide scientific guidance for determining whether to optimize or terminate SVE operations under low-temperature conditions.
[Mh] Termos MeSH primário: Derivados de Benzeno
Recuperação e Remediação Ambiental
Poluentes do Solo
[Mh] Termos MeSH secundário: Benzeno
Solo
Temperatura Ambiente
Tolueno
Xilenos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzene Derivatives); 0 (Soil); 0 (Soil Pollutants); 0 (Xylenes); 3FPU23BG52 (Toluene); J64922108F (Benzene); Z2474E14QP (2-xylene)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170806
[St] Status:MEDLINE


  8 / 3422 MEDLINE  
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[PMID]:28759748
[Au] Autor:Zhao Z; Xing X; Ou X; Liu X; Zhou R; Zhang H; Yang L; Zhuang Z; Su X; Lu Y; Jiang J; Yang Y; Cui D; He Y
[Ad] Endereço:Guangzhou Key Laboratory of Environmental Pollution and Risk Assessment, School of Public Health, Sun Yat-sen University, Guangzhou, China.
[Ti] Título:DNA damage levels in electronics workers in Southern China: A micro-whole blood comet assay.
[So] Source:Mutat Res;803-805:17-21, 2017 Oct.
[Is] ISSN:1873-135X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:We evaluated DNA damage levels of different categories of workers exposed to hazards inside electronics factories in Southern China. To find out the most dangerous risk factor, a cross-sectional study was conducted on a total of 584 exposed subjects and 138 controls in an electronics factory in Southern China, where the electronics industry is prevalent. The exposed hazards included isopropanol (IPO), lead, noise, video display terminals (VDT), lead in a high-temperature (high-temp) environment, and IPO in a high-temp environment. DNA damage detection was performed by the micro-whole blood comet assay using peripheral blood. DNA damage levels were estimated by percent tail DNA (%T). Linear regression models were used to test DNA damage differences between exposed groups and control group with adjustments for potential confounding factors. The level of DNA damage was more significant in both lead in a high-temp and IPO in a high-temp environment groups than in that of the controls (p<0.05). The differences remained significant after stratifying by smoking status (p<0.05). There were no significant differences between groups exposed to IPO, lead, noise, VDT environment and controls. In conclusion, we identified potential risk factors for DNA damage to electronics workers. Special attention should be paid to workers exposed to IPO and lead in a high-temp environment.
[Mh] Termos MeSH primário: Dano ao DNA/efeitos dos fármacos
Substâncias Perigosas/toxicidade
Indústria Manufatureira
Exposição Ocupacional/efeitos adversos
[Mh] Termos MeSH secundário: 2-Propanol/toxicidade
Acetona/toxicidade
Adolescente
Adulto
Benzeno/toxicidade
China
Ensaio Cometa
Estudos Transversais
Feminino
Temperatura Alta
Seres Humanos
Chumbo/toxicidade
Modelos Lineares
Masculino
Inquéritos e Questionários
Tolueno/toxicidade
Xilenos/toxicidade
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hazardous Substances); 0 (Xylenes); 1364PS73AF (Acetone); 2P299V784P (Lead); 3FPU23BG52 (Toluene); J64922108F (Benzene); ND2M416302 (2-Propanol)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170801
[St] Status:MEDLINE


  9 / 3422 MEDLINE  
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[PMID]:28672694
[Au] Autor:Ribeiro H; Ramos S; Homem V; Santos L
[Ad] Endereço:LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
[Ti] Título:Can coastline plant species be used as biosamplers of emerging contaminants? - UV-filters and synthetic musks as case studies.
[So] Source:Chemosphere;184:1134-1140, 2017 Oct.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Personal care products, an important class of emerging contaminants, have been frequently detected in different environmental matrices. Included in this category are synthetic musks compounds (SMCs) and UV-filters. Their occurrence in the coastal environment has been poorly studied. Therefore, this work aimed to verify whether five coastline plant species (Carpobrotus edulis, Cakile maritima, Medicago marina, Elymus farctus borealis-atlanticus and Euphorbia paralias) have the ability to accumulate 11 SMCs (cashmeran, celestolide, phantolide, galaxolide, tonalide, exaltolide, musk moskene, tibetene, ambrette, xylene and ketone) and 2 organic UVB filters (3-(4'-methylbenzylidene) camphor and octocrylene), functioning as biosamplers. To accomplish this task, a QuEChERS technique ("Quick, Easy, Cheap, Effective, Rugged, and Safe") was employed to extract the target compounds from the plant material collected in 15 beaches of Matosinhos and Vila Nova de Gaia (Portugal). The resulting extracts were analysed by gas chromatography-mass spectrometry. Limits of detection ranged from 0.02 ng g for celestolide and tonalide to 1.32 ng g for musk ambrette. The obtained recoveries were around 93% and relative standard deviation was generally less than 15%. SMCs were detected at levels ranging from 1.56 to 350 ng g dw and UV-filters from 2.9 to 264 ng g dw. Galaxolide and 3-(4'-methylbenzylidene) camphor were the synthetic musk and UV-filter detected in higher concentrations, respectively. Plants with higher water content accumulate better SMCs (hottentot-fig), while those with higher lipid content retain better the UV-filters (sea spurge).
[Mh] Termos MeSH primário: Monitoramento Ambiental
Ácidos Graxos Monoinsaturados/análise
Água do Mar/química
Protetores Solares/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Benzopiranos
Dinitrobenzenos
Cromatografia Gasosa-Espectrometria de Massas/métodos
Indanos
Portugal
Receptores Proteína Tirosina Quinases
Receptores Colinérgicos
Tetra-Hidronaftalenos
Xilenos/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzopyrans); 0 (Dinitrobenzenes); 0 (Fatty Acids, Monounsaturated); 0 (Indans); 0 (Receptors, Cholinergic); 0 (Sunscreening Agents); 0 (Tetrahydronaphthalenes); 0 (Water Pollutants, Chemical); 0 (Xylenes); 095I377U8F (musk); 14170060AT (galaxolide); 1Q49IC9FAW (moskene); 21145-77-7 (acetyl methyl tetramethyl tetralin); 83-66-9 (musk ambrette (artificial)); BZR4438MY4 (6,7-dihydro-1,1,2,3,3-pentamethyl-4-(5H)indanone); EC 2.7.10.1 (MUSK protein, human); EC 2.7.10.1 (Receptor Protein-Tyrosine Kinases)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171005
[Lr] Data última revisão:
171005
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170705
[St] Status:MEDLINE


  10 / 3422 MEDLINE  
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[PMID]:28621498
[Au] Autor:Hu Y; Li N; Li G; Wang A; Cong Y; Wang X; Zhang T
[Ad] Endereço:State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, PR China.
[Ti] Título:Sustainable Production of o-Xylene from Biomass-Derived Pinacol and Acrolein.
[So] Source:ChemSusChem;10(14):2880-2885, 2017 Jul 21.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:o-Xylene (OX) is a large-volume commodity chemical that is conventionally produced from fossil fuels. In this study, an efficient and sustainable two-step route is used to produce OX from biomass-derived pinacol and acrolein. In the first step, the phosphotungstic acid (HPW)-catalyzed pinacol dehydration in 1-ethyl-3-methylimidazolium chloride ([emim]Cl) selectively affords 2,3-dimethylbutadiene. The high selectivity of this reaction can be ascribed to the H-bonding interaction between Cl and the hydroxy group of pinacol. The stabilization of the carbocation intermediate by the surrounding anion Cl may be another reason for the high selectivity. Notably, the good reusability of the HPW/[emim]Cl system can reduce the waste output and production cost. In the second step, OX is selectively produced by a Diels-Alder reaction of 2,3-dimethylbutadiene and acrolein, followed by a Pd/C-catalyzed decarbonylation/aromatization cascade in a one-pot fashion. The sustainable two-step process efficiently produces renewable OX in 79 % overall yield. Analogously, biomass-derived crotonaldehyde and pinacol can also serve as the feedstocks for the production of 1,2,4-trimethylbenzene.
[Mh] Termos MeSH primário: Acroleína/química
Biomassa
Glicóis/química
Química Verde
Xilenos/química
[Mh] Termos MeSH secundário: Ligações de Hidrogênio
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Glycols); 0 (Xylenes); 0 (pinacol); 7864XYD3JJ (Acrolein); Z2474E14QP (2-xylene)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170818
[Lr] Data última revisão:
170818
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170617
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700823



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