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https://www.readbyqxmd.com/read/29786662/study-on-the-discrimination-between-citri-reticulatae-pericarpium-varieties-based-on-hs-spme-gc-ms-combined-with-multivariate-statistical-analyses
#1
Yuying Zheng, Xuan Zeng, Wei Peng, Zhong Wu, Weiwei Su
Citri reticulatae pericarpium (CRP), the dried pericarps of Citrus reticulata Blanco and its cultivars, has been widely used in drugs and foods in China for centuries. In this study, an accurate and feasible analytical method based on HS-SPME-GC-MS coupled with multivariate statistical analyses was developed to comprehensively compare volatile compounds of pericarps derived from Citrus reticulata "Chachi" ("Guangchenpi" in Chinese, GCP) and other cultivars of Citrus reticulata Blanco ("Chenpi" in Chinese, CP)...
May 22, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29784402/zinc-ii-based-metal-organic-nanotubes-coating-for-high-sensitive-solid-phase-microextraction-of-nitro-polycyclic-aromatic-hydrocarbons
#2
Xia Wang, Wan-Ru Sheng, Xiao-Yun Jiao, Ru-Song Zhao, Ming-Lin Wang, Jin-Ming Lin
Metal-organic nanotubes (MONTs) have great potential for solid phase microextraction (SPME) on account of high specific surface area, tunable pore sizes, and exceptional thermal and chemical stability. In this work, zinc (II)-based metal-organic nanotubes (Zn-MONTs) were used as an adsorbent for the SPME of nitro-polycyclic aromatic hydrocarbons (NPAHs) at trace levels from environmental water samples. Gas chromatography-mass spectrometry was used for sample analysis and key factors were investigated and optimized...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784394/multiresidue-analytical-method-for-pharmaceuticals-and-personal-care-products-in-sewage-and-sewage-sludge-by-online-direct-immersion-spme-on-fiber-derivatization-gcms
#3
Rebeca López-Serna, David Marín-de-Jesús, Rubén Irusta-Mata, Pedro Antonio García-Encina, Raquel Lebrero, María Fdez-Polanco, Raúl Muñoz
The work here presented aimed at developing an analytical method for the simultaneous determination of 22 pharmaceuticals and personal care products, including 3 transformation products, in sewage and sludge. A meticulous method optimization, involving an experimental design, was carried out. The developed method was fully automated and consisted of the online extraction of 17 mL of water sample by Direct Immersion Solid Phase MicroExtraction followed by On-fiber Derivatization coupled to Gas Chromatography - Mass Spectrometry (DI-SPME - On-fiber Derivatization - GC - MS)...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784338/ionic-liquids-as-signal-amplifiers-for-the-simultaneous-extraction-of-several-neurotransmitters-determined-by-micellar-electrokinetic-chromatography
#4
Natalia Miękus, Ilona Olędzka, Natalia Kossakowska, Alina Plenis, Piotr Kowalski, Adam Prahl, Tomasz Bączek
Nowadays, ionic liquids (ILs) are receiving more attention in various fields of analytical chemistry. Their contribution to the enhancement of the clean-up, extraction, separation and determination of trace amounts of various biologically important compounds in distinct matrices is well documented. Moreover, their importance as "green chemistry" solvents has been pointed out. Advanced analytical methods based on the IL-assisted microextraction and electrophoretic determination of minute concentrations of neurotransmitters (NTs) in samples are presented here for the first time...
August 15, 2018: Talanta
https://www.readbyqxmd.com/read/29784315/solid-phase-microextraction-of-phthalic-acid-esters-from-vegetable-oils-using-iron-iii-based-metal-organic-framework-graphene-oxide-coating
#5
Shuaihua Zhang, Qian Yang, Zhi Li, Wenjin Wang, Xiaohuan Zang, Chun Wang, Zhi Wang
A hybrid composite featuring an iron-based metal-organic framework Material of Institute Lavoisier-88(Fe) and graphene oxide (MIL-88(Fe)/GO) was synthesized and used as the solid-phase microextraction (SPME) coating. The SPME fiber was prepared by covalent bonding of the MIL-88(Fe)/GO composite onto the stainless steel substrate. The fiber had a good durability and allowed >100 replicate extractions. The developed method, which combined the MIL-88(Fe)/GO coated fiber based SPME with gas chromatography-flame ionization detection (GC-FID), achieved low limits of detection (0...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29783172/headspace-sorptive-extraction-gas-chromatography-mass-spectrometry-method-to-measure-volatile-emissions-from-human-airway-cell-cultures
#6
Mei S Yamaguchi, Mitchell M McCartney, Angela L Linderholm, Susan E Ebeler, Michael Schivo, Cristina E Davis
The human respiratory tract releases volatile metabolites into exhaled breath that can be utilized for noninvasive health diagnostics. To understand the origin of this metabolic process, our group has previously analyzed the headspace above human epithelial cell cultures using solid phase microextraction-gas chromatography-mass spectrometry (SPME-GC-MS). In the present work, we improve our model by employing sorbent-covered magnetic stir bars for headspace sorptive extraction (HSSE). Sorbent-coated stir bar analyte recovery increased by 52 times and captured 97 more compounds than SPME...
May 12, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29781022/graphene-based-metal-and-nitrogen-doped-carbon-composites-as-adsorbents-for-highly-sensitive-solid-phase-microextraction-of-polycyclic-aromatic-hydrocarbons
#7
Fuxin Wang, Yu Zheng, Junlang Qiu, Shuqin Liu, Yexiang Tong, Fang Zhu, Gangfeng Ouyang
Herein, a graphene-based metal and nitrogen-doped carbon (GNC-Co) composite, derived from zeolite imidazolate framework-67 (ZIF-67)-graphene oxide composites, was successfully developed and applied as an excellent fiber coating for solid phase microextraction (SPME) with enhanced performance. The fabricated carbon has a hierarchically micro/mesoporous structure with a high specific surface area of 123 m2 g-1. The study found that pyrolytic graphene (G) has good adsorption properties for anthracene, phenanthrene, fluoranthene and pyrene, while pyrolytic ZIF-67 (NC-Co) has good adsorption properties for naphthalene, acenaphthylene, acenaphthylene and fluorene...
May 21, 2018: Nanoscale
https://www.readbyqxmd.com/read/29776551/integrated-atomic-layer-deposition-and-chemical-vapor-reaction-for-the-preparation-of-metal-organic-framework-coatings-for-solid-phase-microextraction-arrow
#8
Hangzhen Lan, Leo D Salmi, Tuukka Rönkkö, Jevgeni Parshintsev, Matti Jussila, Kari Hartonen, Marianna Kemell, Marja-Liisa Riekkola
New chemical vapor reaction (CVR) and atomic layer deposition (ALD)-conversion methods were utilized for preparation of metal organic frameworks (MOFs) coatings of solid phase microextraction (SPME) Arrow for the first time. With simple, easy and convenient one-step reaction or conversion, four MOF coatings were made by suspend ALD iron oxide (Fe2 O3 ) film or aluminum oxide (Al2 O3 ) film above terephthalic acid (H2 BDC) or trimesic acid (H3 BTC) vapor. UIO-66 coating was made by zirconium (Zr)-BDC film in acetic acid vapor...
September 18, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29763782/high-correlation-of-chemical-composition-with-genotype-in-cryptic-species-of-the-liverwort-aneura-pinguis
#9
Rafał Wawrzyniak, Wiesław Wasiak, Beata Jasiewicz, Agnieszka Ludwiczuk, Alina Bączkiewicz, Katarzyna Buczkowska
Chemical constituents of cryptic species detected within the liverwort Aneura pinguis were identified using headspace solid-phase microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS). Fibre coating with divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) was used. A total of 48 samples of A. pinguis were analysed. The studied plants were identified genetically based on barcode DNA sequences and represented three cryptic species (A, B and F) of A. pinguis. Cryptic species A and B are genetically diverse; both represent three evolutionary lineages: A1, A2, A3 and B1, B2, B3, respectively...
May 12, 2018: Phytochemistry
https://www.readbyqxmd.com/read/29761519/evaluation-of-needle-trap-micro-extraction-and-solid-phase-micro-extraction-obtaining-comprehensive-information-on-volatile-emissions-from-in-vitro-cultures
#10
Peter Oertel, Andreas Bergmann, Sina Fischer, Phillip Trefz, Anne Küntzel, Petra Reinhold, Heike Köhler, Jochen K Schubert, Wolfram Miekisch
Volatile organic compounds (VOCs) emitted from in vitro cultures may reveal information on species and metabolism. Due to low nmol L-1 concentration ranges, pre-concentration techniques are required for gas-chromatography mass-spectrometry (GC-MS) based analyses. This study was intended to compare the efficiency of established micro-extraction techniques - solid-phase micro-extraction (SPME) and needle-trap micro-extraction (NTME) - for the analysis of complex VOC patterns. For SPME, a 75 μm Carboxen®/Polydimethylsiloxane fibre was used...
May 14, 2018: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29761442/acquisition-of-volatile-compounds-by-gas-chromatography-mass-spectrometry-gc-ms
#11
José G Vallarino, Alexander Erban, Ines Fehrle, Alisdair R Fernie, Joachim Kopka, Sonia Osorio
Plants synthesize and emit a large range of volatile organic compounds (VOCs) that play important roles in their interactions with the environment, from attracting pollinators and seed dispersers to protectants such as repellants and pathogen inhibitors. As such, the development of techniques for headspace collection of volatiles in combination with gas chromatography-mass spectrometry (GC-MS) has an important impact on our understanding of the biosynthesis of plant VOCs. Furthermore, knowledge of the plant VOCs can be valuable in relation to plant breeding for improving fruit flavor or enhancing resistance to insects or pathogens...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29759194/solid-phase-microextraction-of-volatile-organic-compounds-in-headspace-of-pm-induced-mrc-5-cell-lines
#12
JingHong Li, Nan Chen, YiPing Tian, Hui Xu
The exploration of volatile organic compounds (VOCs) produced by cell lines may be a powerful and non-invasive tool for the study of the health risk of human exposure to atmospheric particulate matter (PM). In this work, we developed a sensitive solid phase microextraction-gas chromatography-mass spectrometry method (SPME-GC-MS) to analyze VOCs in breathed gas of PM2.5-induced human embryonic fibroblast cell line (MRC-5). A novel graphene oxide/polyaniline/polydopamine (GO/PANI/PDA) coating was prepared on a stainless steel wire via electrochemical deposition and self-polymerization for the first time...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29759179/n-doped-carbon-nanotubes-reinforced-hollow-fiber-solid-phase-microextraction-coupled-with-high-performance-liquid-chromatography-for-the-determination-of-phytohormones-in-tomatoes
#13
Xiao-Fei Han, Juan Chen, Yan-Ping Shi
A N-doped carbon nanotubes-reinforced hollow fiber solid-phase microextraction (N-doped CNTs-HF-SPME) method was developed for determination of two naphthalene-derived phytohormones, 1-naphthalene acetic acid (NAA) and 2-naphthoxyacetic acid (2-NOA), at trace levels in tomatoes. N-doped CNTs were dispersed in ultrapure water with the assistance of surfactant, and then immobilized into the pores of hollow fiber by capillary forces and sonification. The resultant N-doped CNTs-HF was wetted with 1-octanol, subsequently immersed into the tomato samples to extract the target analytes under a magnetic stirring, and then desorbed with methanol by sonication prior to chromatographic analysis...
August 1, 2018: Talanta
https://www.readbyqxmd.com/read/29757971/comparison-of-the-conventional-and-electroenhanced-direct-immersion-solid-phase-microextraction-for-sampling-of-nicotine-in-biological-fluids-of-the-human-body
#14
Sana Abdolhosseini, Ali Reza Ghiasvand, Nahid Heidari
A stainless steel fiber was made porous and adhesive by platinization and then coated by nanostructured polypyrrole (PPy), using an appropriate electrophoretic deposition (EPD) method. The morphological surface structure and functional groups of the PPy-coated fiber were studied using SEM (Scanning electron microscope) instrument. The prepared fiber was used for comparison of direct immersion (DI) and electroenhanced direct immersion solid-phase microextraction (EE-DI-SPME) of nicotine in human plasma and urine samples followed by gas chromatography flame ionization detector (GC-FID) determination...
May 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29757616/rapid-solid-phase-microextraction-of-dna-from-mycobacteria-in-artificial-sputum-samples-enables-visual-detection-using-isothermal-amplification
#15
Marcelino Varona, Xiong Ding, Kevin D Clark, Jared L Anderson
Point-of-care (POC) technologies for the detection of pathogens in clinical samples are highly valued due to their speed, ease of use, and cost-effectiveness. Furthermore, they are ideally suited for resource-limited settings where expensive and sophisticated laboratory equipment may not be readily available. In this study, a rapid method based on solid-phase microextraction of mycobacterial DNA with subsequent isothermal amplification and visual detection was developed. Direct coupling of the SPME desorption solution (1 M NaCl) to the isothermal reaction system was achieved to circumvent dilution steps and improve detection limits...
May 14, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29757264/characterization-of-a-microbial-consortium-for-the-bioremoval-of-polycyclic-aromatic-hydrocarbons-pahs-in-water
#16
Esmeralda G Blanco-Enríquez, Francisco Javier Zavala-Díaz de la Serna, María Del Rosario Peralta-Pérez, Lourdes Ballinas-Casarrubias, Iván Salmerón, Héctor Rubio-Arias, Beatriz A Rocha-Gutiérrez
Pollution of freshwater ecosystems from polycyclic aromatic hydrocarbons (PAHs) is a global concern. The US Environmental Protection Agency (EPA) has included the PAHs pyrene, phenanthrene, and naphthalene among the 16 priority compounds of special concern for their toxicological effects. The aim of this study was to adapt and characterize a microbial consortium from ore waste with the potential to remove these three PAHs from water. This microbial consortium was exposed to the target PAHs at levels of 5, 10, 20, 50, and 100 mg L−1 for 14 days...
May 13, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29756950/single-particle-mobility-edge-in-a-one-dimensional-quasiperiodic-optical-lattice
#17
Henrik P Lüschen, Sebastian Scherg, Thomas Kohlert, Michael Schreiber, Pranjal Bordia, Xiao Li, S Das Sarma, Immanuel Bloch
A single-particle mobility edge (SPME) marks a critical energy separating extended from localized states in a quantum system. In one-dimensional systems with uncorrelated disorder, a SPME cannot exist, since all single-particle states localize for arbitrarily weak disorder strengths. However, in a quasiperiodic system, the localization transition can occur at a finite detuning strength and SPMEs become possible. In this Letter, we find experimental evidence for the existence of such a SPME in a one-dimensional quasiperiodic optical lattice...
April 20, 2018: Physical Review Letters
https://www.readbyqxmd.com/read/29751923/rapid-identification-of-staphylococcus-aureus-vibrio-parahaemolyticus-and-shigella-sonnei-in-foods-by-solid-phase-microextraction-coupled-with-gas-chromatography-mass-spectrometry
#18
Yu Wang, Sijing Liu, Qikang Pu, Yongxin Li, Xixi Wang, Yang Jiang, Danni Yang, Yi Yang, Jinling Yang, Chengjun Sun
A novel approach for rapid identification of three foodborne pathogens including Staphylococcus aureus, Vibrio parahaemolyticus and Shigella sonnei in foods by solid phase microextraction (SPME) coupled with gas chromatography-mass spectrometry (GC-MS) was established. After cultivation 24, 18 and 20 h for Staphylococcus aureus, Vibrio parahaemolyticus and Shigella sonnei, respectively, the microbial volatile organic compounds (MVOCs) were extracted with a SPME device equipped with divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) coated fibers...
October 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29750941/ultrasonic-assisted-magnetic-dispersive-solid-phase-microextraction-for-pre-concentration-of-serotonin-norepinephrine-reuptake-inhibitor-drugs
#19
Mahdi Ghorbani, Mahmoud Chamsaz, Mohsen Aghamohammadhasan, Alireza Shams
A simple and sensitive ultrasonic assisted magnetic dispersive solid phase microextraction method (UAMDSPME) coupled with high performance liquid chromatography was developed to determine serotonin-norepinephrine reuptake inhibitor drugs including duloxetine (DUL), venlafaxine (VEN) and atomoxetine (ATO) in human urine, river water and well water samples. A novel and efficient SPME sorbent, magnetic p-Phenylenediamine functionalized reduced graphene oxide Quantum Dots@ Ni nanocomposites (MrGOQDs-PD@ Ni), was prepared and applied for extraction of the analytes...
May 8, 2018: Analytical Biochemistry
https://www.readbyqxmd.com/read/29743024/endophytic-fungi-from-the-roots-of-horseradish-armoracia-rusticana-and-their-interactions-with-the-defensive-metabolites-of-the-glucosinolate-myrosinase-isothiocyanate-system
#20
Zsolt Szűcs, Tamás Plaszkó, Zoltán Cziáky, Attila Kiss-Szikszai, Tamás Emri, Regina Bertóti, László Tamás Sinka, Gábor Vasas, Sándor Gonda
BACKGROUND: The health of plants is heavily influenced by the intensively researched plant microbiome. The microbiome has to cope with the plant's defensive secondary metabolites to survive and develop, but studies that describe this interaction are rare. In the current study, we describe interactions of endophytic fungi with a widely researched chemical defense system, the glucosinolate - myrosinase - isothiocyanate system. The antifungal isothiocyanates are also of special interest because of their beneficial effects on human consumers...
May 9, 2018: BMC Plant Biology
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