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A new approach based on a combination of direct and headspace cold-fiber solid-phase microextraction modes in the same procedure for the determination of polycyclic aromatic hydrocarbons and phthalate esters in soil samples	2011	Departamento de Quimica, Universidade Federal de Santa Catarina, Florianopolis, SC 88040-900, Brazil.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of chromatography.A Periodical, Abbrev. J.Chromatogr.A Pub Date Free Form 1-Apr Volume 1218 Issue 13 Start Page 1707 Other Pages 1714 Notes LR: 20151119; CI: Copyright (c) 2011; JID: 9318488; 0 (Phthalic Acids); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Soil); 451W47IQ8X (Sodium Chloride); 2010/11/19 [received]; 2011/01/21 [revised]; 2011/01/24 [accepted]; 2011/01/31 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-3778; 0021-9673 Accession Number PMID: 21316689 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.chroma.2011.01.074 [doi] Output Language Unknown(0) PMID 21316689 Abstract This study describes a new approach to cold-fiber solid-phase microextraction (CF-SPME) based on a combination of different extraction modes in the same extraction procedure. Also, the high quantity of water required to facilitate both the desorption of analytes from the matrix and their transport to the fiber coating is reported. The extraction mode was changed from the direct to the headspace mode in a single extraction while manipulating the extraction times and coating temperature to improve the extraction of compounds with different volatilities. Compounds with low volatility were better extracted in the direct mode, while the headspace mode was more appropriate for volatile compounds. Polycyclic aromatic hydrocarbons (PAHs) and phthalic acid esters (PEs) in sand or soil samples were used as model compounds and matrices in this study. The optimized conditions were: sample pH in the range of 4-7, addition of 12 mL of 194 g L(-1) aqueous NaCl solution in a 15 mL vial, and 80 min total extraction time with a sample temperature of 90 degrees C (50 min in direct mode with coating at 90 degrees C followed by 30 min in headspace mode with coating at 30 degrees C). The proposed procedure was compared with conventional CF-SPME (with and without addition of water) and was found to be more effective for all the analytes, since it is capable of extracting both heavier and lighter compounds from soil samples in a single extraction procedure. The use of an excess of water and a combination of extraction modes in the same CF-SPME procedure are the main factors responsible for this enhancement. The proposed method was applied to the extraction of PAHs and PEs in spiked soil samples and excellent results were obtained for most of the compounds evaluated. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Martendal,E., Carasek,E. Original/Translated Title URL Date of Electronic 20110131 PMCID Editors
A new generation of self-etching adhesives: comparison with traditional acid etch technique	2008	Department of Orthodontics, Friedrich Alexander University, Erlangen-Nuremberg, Germany.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of orofacial orthopedics = Fortschritte der Kieferorthopadie : Organ/official journal Deutsche Gesellschaft fur Kieferorthopadie Periodical, Abbrev. J.Orofac.Orthop. Pub Date Free Form Mar Volume 69 Issue 2 Start Page 78 Other Pages 93 Notes JID: 9713484; 0 (BOND-1 adhesive); 0 (Composite Resins); 0 (Methacrylates); 0 (Resin Cements); 0 (Transbond Plus Self-Etching Primer); 0 (Transbond XT Light Cure Adhesive Primer); 2007/03/13 [received]; 2007/12/19 [accepted]; ppublish Place of Publication Germany ISSN/ISBN 1434-5293; 1434-5293 Accession Number PMID: 18385954 Language eng; ger SubFile Comparative Study; Journal Article; D; IM DOI 10.1007/s00056-008-0709-6 [doi] Output Language Unknown(0) PMID 18385954 Abstract OBJECTIVE: The aim of this study was to determine the shear bond strength (SBS), etching pattern and depth, and debonding performance of several market-leading, self-etching (SE) adhesives primarily used in restorative dentistry (iBond, Clearfil S(3) Bond, Clearfil Protect Bond, AdheSE, XenoIII), two experimental self-etching adhesives (exp. Bond 1, exp. Bond 2) and one experimental self-etching cement (SE Zement) used with and without prior phosphoric acid-etching, and to compare them to an orthodontic self-etching product (Transbond Plus SE Primer) and to traditional acid-etch technique (Transbond XT Primer, phosphoric acid) MATERIALS AND METHODS: All adhesives were applied on pumiced and embedded bovine incisors following the manufacturers' instructions. Then one bracket each (coated with Transbond XT composite) was bonded (n = 20). Transbond XT was polymerized for 20 s from the incisal and gingival sides using a halogen device positioned at a constant 5 mm from and a 45 degrees angle to the specimen. The specimens were stored in distilled water for 24 h at 37 degrees C before measuring SBS. The ARI (adhesive remnant index) for all specimens was determined from the sheared-off brackets of each. After conditioning, the surface texture was morphologically evaluated from scanning electron microscope (SEM) images, while the etching depth was determined using a confocal laser-scanning microscope (CLSM). All groups were tested for normal distribution and analyzed by applying ANOVA, Kruskal-Wallis or the t test. In addition, a Bonferroni correction was used. RESULTS: The median values of the SBS tests were: SE Zement 3.0 MPa, SE Zement preceded by phosphoric acid etching 11.2 MPa, experimental bond 1: 7.4 MPa, experimental bond 2: 5.6 MPa, iBond 8.1 MPa, Clearfil S(3) Bond 14.1 MPa, Clearfil Protect Bond 16.6 MPa, Clearfil SE Bond 15.9 MPa, AdheSE 16.0 MPa, XenoIII 16.1 MPa, Transbond SE Primer 20.7 MPa, acid-etching+Transbond XT Primer 21.0 MPa. With the exception of iBond, we observed no significant differences among the self-etching adhesives used in Restorative Dentistry or in comparison to the Transbond Plus SE Primer. No significant differences were apparent even when compared to the Transbond XT Primer after phosphoric acid-etching. Both experimental bonding agents and SE Zement without acid etching performed significantly worse than the products mentioned above, failing to demonstrate sufficient adhesive strength. SEM examination revealed less distinctive enamel-etching patterns for self-etching products than for phosphoric acid-etching. CLSM analysis revealed etching depths between 0.5 and 20 microm depending on the product. When self-etching products were used, less residual composite remained on the enamel surface than after phosphoric acid-etching. CONCLUSIONS: All the adhesives tested are suitable for bonding orthodontic brackets and to reduce the risk of enamel fracture while minimizing etching depth, which in turns means less conditioning-related enamel loss. More development is needed to improve the etching performance of both experimental bonding agents and SE Zement. Descriptors Acid Etching, Dental/methods, Animals, Cattle, Composite Resins/analysis, Dental Bonding, Dental Debonding, Dental Enamel/drug effects/pathology, Humans, Methacrylates/analysis, Microscopy, Confocal, Microscopy, Electron, Scanning, Orthodontic Brackets, Resin Cements/analysis, Shear Strength, Surface Properties Links Book Title Database Publisher Data Source Authors Holzmeier,M., Schaubmayr,M., Dasch,W., Hirschfelder,U. Original/Translated Title URL Date of Electronic PMCID Editors
A new liquid-phase microextraction method based on solidification of floating organic drop	2007	Department of Chemistry, School of Sciences, Tarbiat Modarres University, P.O. Box 14115-175, Tehran, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Analytica Chimica Acta Periodical, Abbrev. Anal.Chim.Acta Pub Date Free Form 7-Mar Volume 585 Issue 2 Start Page 286 Other Pages 293 Notes LR: 20131121; JID: 0370534; 0 (Alcohols); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Solvents); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 2006/10/17 [received]; 2006/12/20 [revised]; 2006/12/21 [accepted]; 2007/01/12 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-4324; 0003-2670 Accession Number PMID: 17386676 Language eng SubFile Journal Article; IM DOI S0003-2670(07)00003-7 [pii] Output Language Unknown(0) PMID 17386676 Abstract In the present study, a new and versatile liquid-phase microextraction method is described. This method requires very simple and cheap apparatus and also a small amount of organic solvent. Eight microliters of 1-undecanol was delivered to the surface of solution containing analytes and solution was stirred for a desired time. Then sample vial was cooled by inserting it into an ice bath for 5 min. The solidified 1-undecanol was transferred into a suitable vial and immediately melted; then, 2 microL of it was injected into a gas chromatograph for analysis. Some polycyclic aromatic hydrocarbons (PAHs) were used as model compounds for developing and evaluating of the method performance. Analysis was carried out by gas chromatography/flame ionization detection (GC/FID). Several factors influencing the microextraction efficiency, such as the nature and volume of organic solvent, the temperature and volume of sample solution, stirring rate and extraction time were investigated and optimized. The applicability of the technique was evaluated by determination of trace amounts of PAHs in environmental samples. Under the optimized conditions, the detection limits (LOD) of the method were in the range of 0.07-1.67 microg L(-1) and relative standard deviations (R.S.D.) for 10 microg L(-1) PAHs were 0.995) in a calibration range of 0.25-300.00 microg L(-1) was obtained. After 30 min extraction duration, enrichment factors were in the range of 594-1940. Finally, the proposed method was applied to the determination of trace amounts of PAHs in several real water samples, and satisfactory results were resulted. Since very simple devices were used, this new technique is affordable, efficient, and convenient for extraction and determination of low concentrations of PAHs in water samples. Descriptors Alcohols/chemistry, Calibration, Chemistry Techniques, Analytical/methods, Chemistry, Organic/methods, Chromatography, Gas/methods, Environmental Monitoring, Polycyclic Hydrocarbons, Aromatic/chemistry, Regression Analysis, Reproducibility of Results, Solvents, Temperature, Time Factors, Water/chemistry, Water Pollutants, Chemical/analysis Links Book Title Database Publisher Data Source Authors Khalili Zanjani,M. R., Yamini,Y., Shariati,S., Jonsson,J. A. Original/Translated Title URL Date of Electronic 20070112 PMCID Editors
A new safety channel based on (1)(7)N detection in research reactors	2015	Reactor Research School, Nuclear Science and Technology Research Institute (NSTRI), P.O. Box 143995-1113, Tehran, Iran.; Department of Energy and Physics, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran. Electronic address: mgharib2@	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for use in Agriculture, Industry and Medicine Periodical, Abbrev. Appl.Radiat.Isot. Pub Date Free Form Oct Volume 104 Issue Start Page 1 Other Pages 4 Notes CI: Copyright (c) 2015; JID: 9306253; OTO: NOTNLM; 2014/10/11 [received]; 2015/05/20 [revised]; 2015/06/04 [accepted]; 2015/06/19 [aheadofprint]; ppublish Place of Publication England ISSN/ISBN 1872-9800; 0969-8043 Accession Number PMID: 26123105 Language eng SubFile Journal Article DOI 10.1016/j.apradiso.2015.06.005 [doi] Output Language Unknown(0) PMID 26123105 Abstract Tehran research reactor (TRR) is a representative of pool type research reactors using light water, as coolant and moderator. This reactor is chosen as a prototype to demonstrate and prove the feasibility of (17)N detection as a new redundant channel for reactor power measurement. In TRR, similar to other pool type reactors, neutron detectors are immersed in the pool around the core as the main power measuring devices. In the present article, a different approach, using out of water neutron detector, is employed to measure reactor power. This new method is based on (17)O (n,p) (17)N reaction taking place inside the core and subsequent measurement of delayed neutrons emitted due to (17)N disintegration. Count and measurement of neutrons around outlet water pipe provides a reliable redundant safety channel to measure reactor power. Results compared with other established channels indicate a good agreement and shows a linear interdependency with true thermal power. Safety of reactor operation is improved with installation & use of this new power measuring channel. The new approach may equally serve well as a redundant channel in all other types of reactors having coolant comprised of oxygen in its molecular constituents. Contrary to existing channels, this one is totally out of water and thus is an advantage over current instrumentations. It is proposed to employ the same idea on other reactors (nuclear power plants too) to improve safety criteria. Descriptors Links Book Title Database Publisher Elsevier Ltd Data Source Authors Seyfi,S., Gharib,M. Original/Translated Title URL Date of Electronic 20150619 PMCID Editors
A new structural element containing glycine-rich proteins and rhamnogalacturonan I in the protoxylem of seed plants	2004	Ryser, U., University of Fribourg, Biology Department, Plant Biology, Fribourg, Switzerland	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Journal of cell science Periodical, Abbrev. J.Cell.Sci. Pub Date Free Form 2004/03 Volume 117 Issue 7 Start Page 1179 Other Pages 1190 Notes Place of Publication ISSN/ISBN 0021-9533 Accession Number Language SubFile DOI Output Language Unknown(0) PMID Abstract The water pipes of elongating plant organs are the result of programmed cell death and are formed by the walls of dead and empty protoxylem elements. These protoxylem elements are passively elongated many times by the surrounding tissue before they are replaced and collapse. Well-known adaptations for this unique task include the characteristic secondary wall thickenings, forming rings and helices. A new, clearly distinct structural element containing glycine-rich proteins is now visualized for the first time, using confocal laser scanning microscopy in the mature protoxylem of elongating organs of seed plants. This structural element is arranged along the longitudinal axis of the protoxylem elements. It interconnects the secondary wall thickenings within and between protoxylem elements, as well as the protoxylem with other cell types such as xylem parenchyma cells and metaxylem elements. The structural element is stable against detergent extractions, proteinase, pectinase and cellulase hydrolysis, and is closely associated with rhamnogalacturonan-I, a pectic polysaccharide. The results clearly demonstrate that the cell wall of protoxylem cells is a highly dynamic and complex structure. The typical polysaccharide-rich primary wall of living and elongating plant cells is progressively modified and finally replaced by a protein-rich wall in the dead and passively stretched protoxylem elements. These glycine-rich walls originated early in the evolution of the seed plants as confirmed by the analysis of genomic information. Descriptors cellulase, detergent, glycine, polygalacturonase, polysaccharide, proteinase, rhamnogalacturonan I, unclassified drug, vegetable protein, article, cell elongation, cells by body anatomy, cell wall, confocal laser microscopy, controlled study, extraction, genome analysis, maturation, nonhuman, nucleotide sequence, plant cell, plant evolution, plant structures, plant parenchyma cell, plant seed, priority journal, thickness Links Book Title Database Embase; MEDLINE Publisher Data Source Embase Authors Ryser,U., Schorderet,M., Guyot,R., Keller,B. Original/Translated Title URL Date of Electronic PMCID Editors
A newly identified susceptibility locus near FOXP1 modifies the association of gastroesophageal reflux with Barrett's esophagus	2015	Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington. Department of Biostatistics, University of Washington, School of Public Health, Seattle, Washington. jdai@fredhutch.org tvaughan@u.washington.edu.; Division o	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology Periodical, Abbrev. Cancer Epidemiol.Biomarkers Prev. Pub Date Free Form Nov Volume 24 Issue 11 Start Page 1739 Other Pages 1747 Notes LR: 20160715; CI: (c)2015; GR: K05 CA124911/CA/NCI NIH HHS/United States; GR: K05CA124911/CA/NCI NIH HHS/United States; GR: K24 DK100548/DK/NIDDK NIH HHS/United States; GR: P01 CA053996/CA/NCI NIH HHS/United States; GR: P01 CA091955/CA/NCI NIH HHS/United Place of Publication United States ISSN/ISBN 1538-7755; 1055-9965 Accession Number PMID: 26377193 Language eng SubFile Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; IM DOI 10.1158/1055-9965.EPI-15-0507 [doi] Output Language Unknown(0) PMID 26377193 Abstract BACKGROUND: Important risk factors for esophageal adenocarcinoma and its precursor, Barrett's esophagus, include gastroesophageal reflux disease, obesity, and cigarette smoking. Recently, genome-wide association studies have identified seven germline single-nucleotide polymorphisms (SNP) that are associated with risk of Barrett's esophagus and esophageal adenocarcinoma. Whether these genetic susceptibility loci modify previously identified exposure-disease associations is unclear. METHODS: We analyzed exposure and genotype data from the BEACON Consortium discovery phase GWAS, which included 1,516 esophageal adenocarcinoma case patients, 2,416 Barrett's esophagus case patients, and 2,187 control participants. We examined the seven newly identified susceptibility SNPs for interactions with body mass index, smoking status, and report of weekly heartburn or reflux. Logistic regression models were used to estimate ORs for these risk factors stratified by SNP genotype, separately for Barrett's esophagus and esophageal adenocarcinoma. RESULTS: The odds ratio for Barrett's esophagus associated with at least weekly heartburn or reflux varied significantly with the presence of at least one minor allele of rs2687201 (nominal P = 0.0005, FDR = 0.042). ORs (95% CIs) for weekly heartburn or reflux among participants with 0, 1, or 2 minor alleles of rs2687201 were 6.17 (4.91-7.56), 3.56 (2.85-4.44), and 3.97 (2.47-6.37), respectively. No statistically significant interactions were observed for smoking status and body mass index. CONCLUSION: Reflux symptoms are more strongly associated with Barrett's esophagus risk among persons homozygous for the major allele of rs2687201, which lies approximately 75 kb downstream of the transcription factor gene FOXP1. IMPACT: The novel gene-exposure interaction discovered in this study provides new insights into the etiology of esophageal adenocarcinoma. Descriptors Links Book Title Database Publisher American Association for Cancer Research Data Source Authors Dai,J.Y., de Dieu Tapsoba,J., Buas,M.F., Onstad,L.E., Levine,D.M., Risch,H.A., Chow,W.H., Bernstein,L., Ye,W., Lagergren,J., Bird,N.C., Corley,D.A., Shaheen,N.J., Wu,A.H., Reid,B.J., Hardie,L.J., Whiteman,D.C., Vaughan,T.L. Original/Translated Title URL Date of Electronic 20150916 PMCID PMC4816532 Editors
A novel assay of biofilm antifungal activity reveals that amphotericin B and caspofungin lyse Candida albicans cells in biofilms	2011	Department of Pediatrics, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Yeast (Chichester, England) Periodical, Abbrev. Yeast Pub Date Free Form Aug Volume 28 Issue 8 Start Page 561 Other Pages 568 Notes LR: 20131121; CI: Copyright (c) 2011; GR: 1R01AI075033/AI/NIAID NIH HHS/United States; JID: 8607637; 0 (Antifungal Agents); 0 (Echinocandins); 0 (Fungal Proteins); 7XU7A7DROE (Amphotericin B); EC 2.7.4.3 (Adenylate Kinase); F0XDI6ZL63 (caspofungin); 2011/ Place of Publication England ISSN/ISBN 1097-0061; 0749-503X Accession Number PMID: 21674619 Language eng SubFile Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.; IM DOI 10.1002/yea.1860 [doi] Output Language Unknown(0) PMID 21674619 Abstract The ability of Candida albicans to form drug-resistant biofilms is an important factor in its contribution to human disease. Assays to identify and characterize molecules with activity against fungal biofilms are crucial for the development of drugs with improved anti-biofilm activity. Here we report the application of an adenylate kinase (AK)-based cytotoxicity assay of fungal cell lysis to the characterization of agents active against C. albicans biofilms. We have developed three protocols for the AK assay. The first measures AK activity in the supernatants of biofilms treated with antifungal drugs and can be performed in parallel with a standard 2,3-bis-(2-methoxy-4-nitro-5-sulphophenyl)-2H-tetrazolium-5-caboxanilide-based biofilm susceptibility assay; a second, more sensitive protocol measures the AK activity present within the biofilm matrix; and a third procedure allows the direct visualization of lytic activity toward biofilms formed on catheter material. Amphotericin B and caspofungin, the two most effective anti-biofilm drugs currently used to treat fungal infections, both directly lyse planktonic C. albicans cells in vitro, leading to the release of AK into the culture medium. These studies serve to validate the AK-based lysis assay as a useful addition to the methods for the characterization of antifungal agents active toward biofilms and provide insights into the mode of action of amphotericin B and caspofungin against C. albicans biofilms. Descriptors Links Book Title Database Publisher John Wiley & Sons, Ltd Data Source Authors DiDone,L., Oga,D., Krysan,D.J. Original/Translated Title URL Date of Electronic 20110615 PMCID Editors
A novel coating based on carbon nanotubes/poly-ortho-phenylenediamine composite for headspace solid-phase microextraction of polycyclic aromatic hydrocarbons	2013	Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76169-133, Kerman, Iran.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Talanta Periodical, Abbrev. Talanta Pub Date Free Form 15-Apr Volume 108 Issue Start Page 66 Other Pages 73 Notes CI: Copyright (c) 2013; JID: 2984816R; 0 (Nanotubes, Carbon); 0 (Phenylenediamines); 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 0 (poly(o-phenylenediamine)); 12597-68-1 (Stainless Steel); 2013/01/08 [received]; 2013/02/14 [revi Place of Publication Netherlands ISSN/ISBN 1873-3573; 0039-9140 Accession Number PMID: 23601871 Language eng SubFile Journal Article; IM DOI 10.1016/j.talanta.2013.02.040 [doi] Output Language Unknown(0) PMID 23601871 Abstract A novel nanocomposite coating made of poly-o-phenylenediamine (PoPD) and oxidized multiwalled carbon nanotubes (MWCNTs) was electrochemically prepared for the first time on stainless steel wire. Subsequently, it was applied to headspace solid-phase microextraction (HS-SPME) and gas chromatographic analysis of biphenyl and seven polycyclic aromatic hydrocarbons (PAHs). The effects of polymerization potential, polymerization time, concentration of o-phenylenediamine and oxidized MWCNTs were investigated on the coating process. The fiber coating was carried out easily and in a reproducible manner, and the produced fiber was stable at high temperatures. The surface morphology of the coating was examined by scanning electron microscopy (SEM). The effects of various parameters on the efficiency of HS-SPME process, such as desorption temperature, desorption time, extraction temperature, extraction time and ionic strength were also studied. Under optimized conditions, the calibration graphs were linear in the range of 0.1-300 ng mL(-1), and the detection limits for biphenyl and PAHs studied were between 0.02 and 0.09 ng mL(-1). The intra-day and inter-day relative standard deviations obtained at 5 ng mL(-1) concentration level (n=5), using a single fiber, were 3.2-7.8% and 5.2-9.3%, respectively. The fiber-to-fiber RSD% (n=3) were 6.2-11.3% at 5 ng mL(-1). The proposed HS-SPME method was successfully applied for the analysis of PAHs in water samples. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Behzadi,M., Noroozian,E., Mirzaei,M. Original/Translated Title URL Date of Electronic 20130304 PMCID Editors
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet method for determination of polycyclic aromatic hydrocarbons in aqueous samples	2009	Department of Chemistry, Wuhan University, Wuhan 430072, China. huixu@mail.ccnu.edu.cn	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Analytica Chimica Acta Periodical, Abbrev. Anal.Chim.Acta Pub Date Free Form 16-Mar Volume 636 Issue 1 Start Page 28 Other Pages 33 Notes LR: 20131121; JID: 0370534; 0 (Polycyclic Hydrocarbons, Aromatic); 0 (Water Pollutants, Chemical); 059QF0KO0R (Water); 178A96NLP2 (Dodecanol); 2008/10/25 [received]; 2008/12/24 [revised]; 2009/01/14 [accepted]; 2009/01/21 [aheadofprint]; ppublish Place of Publication Netherlands ISSN/ISBN 1873-4324; 0003-2670 Accession Number PMID: 19231352 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.aca.2009.01.028 [doi] Output Language Unknown(0) PMID 19231352 Abstract A new dispersive liquid-liquid microextraction based on solidification of floating organic droplet method (DLLME-SFO) was developed for the determination of five kinds of polycyclic aromatic hydrocarbons (PAHs) in environmental water samples. In this method, no specific holder, such as the needle tip of microsyringe and the hollow fiber, is required for supporting the organic microdrop due to the using of organic solvent with low density and proper melting point. Furthermore, the extractant droplet can be collected easily by solidifying it in the lower temperature. 1-Dodecanol was chosen as extraction solvent in this work. A series of parameters that influence extraction were investigated systematically. Under optimal conditions, enrichment factors (EFs) for PAHs were in the range of 88-118. The limit of detections (LODs) for naphthalene, diphenyl, acenaphthene, anthracene and fluoranthene were 0.045, 0.86, 0.071, 1.1 and 0.66ngmL(-1), respectively. Good reproducibility and recovery of the method were also obtained. Compared with the traditional liquid-phase microextraction (LPME) and dispersive liquid-liquid microextraction (DLLME) methods, the proposed method obtained about 2 times higher enrichment factor than those in LPME. Moreover, the solidification of floating organic solvent facilitated the phase transfer. And most importantly, it avoided using high-density and toxic solvent in the traditional DLLME method. The proposed method was successfully applied to determinate PAHs in the environmental water samples. The simple and low-cost method provides an alternative method for the analysis of non-polar compounds in complex environmental water. Descriptors Dodecanol/chemistry, Environmental Monitoring, Phase Transition, Polycyclic Hydrocarbons, Aromatic/analysis/isolation & purification, Reproducibility of Results, Temperature, Time Factors, Water/chemistry, Water Pollutants, Chemical/analysis/isolation & purification Links Book Title Database Publisher Data Source Authors Xu,H., Ding,Z., Lv,L., Song,D., Feng,Y. Q. Original/Translated Title URL Date of Electronic 20090121 PMCID Editors
A novel extraction technique based on carbon nanotubes reinforced hollow fiber solid/liquid microextraction for the measurement of piroxicam and diclofenac combined with high performance liquid chromatography	2012	Key Laboratory of Chemistry of Northwestern Plant Resources, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.	Read more...
Source Type Print(0) Ref Type Journal Article Periodical, Full Talanta Periodical, Abbrev. Talanta Pub Date Free Form 15-Oct Volume 100 Issue Start Page 153 Other Pages 161 Notes LR: 20131121; CI: Copyright (c) 2012; JID: 2984816R; 0 (Nanotubes, Carbon); 0 (Salts); 0 (Solvents); 059QF0KO0R (Water); 13T4O6VMAM (Piroxicam); 144O8QL0L1 (Diclofenac); 2012/05/31 [received]; 2012/08/16 [revised]; 2012/08/27 [accepted]; 2012/09/03 [ahead Place of Publication Netherlands ISSN/ISBN 1873-3573; 0039-9140 Accession Number PMID: 23141323 Language eng SubFile Journal Article; Research Support, Non-U.S. Gov't; IM DOI 10.1016/j.talanta.2012.08.042 [doi] Output Language Unknown(0) PMID 23141323 Abstract A novel design of carbon nanotubes reinforced hollow fiber solid/liquid phase microextraction (CNTs-HF-SLPME) was developed to determine piroxicam and diclofenac in different real water samples. Functionalized multi-walled carbon nanotubes (MWCNTs) were held in the pores of hollow fiber with sol-gel technology. The pores and lumen of carbon nanotubes reinforced hollow fiber were subsequently filled with a muL volume of organic solvent (1-octanol), and then the whole assembly was used for the extraction of the target analytes in direct immersion sampling mode. The target analytes were extracted from the sample by two extractants, one of which is organic solvent placed inside the pores and lumen of hollow fiber and the other one is CNTs held in the pores of hollow fiber. After extraction, the analytes were desorbed in acetonitrile and analyzed using high performance liquid chromatography. This novel extraction mode showed more excellent extraction performance in comparison with conventional hollow fiber liquid microextraction (without adding CNTs) and carbon nanotubes reinforced hollow fiber solid microextraction (CNTs held in the pores of hollow fiber, but no organic solvents placed inside the lumen of hollow fiber) under the respective optimum conditions. This method provided 47- and 184-fold enrichment factors for piroxicam and diclofenac, respectively, good inter-fiber repeatability and batch-to-batch reproducibility. Linearity was observed in the range of 20-960 mug L(-1) for piroxicam, and 10-2560 mug L(-1) for diclofenac, with correlation coefficients of 0.9985 and 0.9989, respectively. The limits of detection were 4.58 mug L(-1) for piroxicam and 0.40 mug L(-1) for diclofenac. Descriptors Links Book Title Database Publisher Elsevier B.V Data Source Authors Song,X.Y., Shi,Y.P., Chen,J. Original/Translated Title URL Date of Electronic 20120903 PMCID Editors

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