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Analytica Chimica Acta

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https://www.readbyqxmd.com/read/30032777/facile-preparation-of-microporous-organic-polymers-functionalized-macroporous-hydrophilic-resin-for-selective-enrichment-of-glycopeptides
#1
Ya Li, Hongwei Wang, Xin You, Shujuan Ma, Jing Dong, Yinmao Wei, Junjie Ou, Mingliang Ye
A macroporous adsorption resin (MAR) with ∼10 μm diameter was synthesized by seed-swelling polymerization and further modified with a layer of microporous organic polymers (MOP) by "one-pot" solvothermal reaction. The resulting MAR@MOP exhibited high specific surface area of 131.3 m2 /g, which was higher than that of pristine MAR (57.8 m2 /g). The contact angle also decreased from 58.8° (MAR) to 24° (MAR@MOP), indicating that the MOP was successfully grafted onto the surface of MAR. The chemical composition of MAR@MOP was confirmed by Fourier-transform infrared spectroscopy, 13 C NMR and element analysis...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032776/preparation-and-characterization-of-dummy-template-molecularly-imprinted-polymers-as-potential-sorbents-for-the-recognition-of-selected-polybrominated-diphenyl-ethers
#2
Mariusz Marć, Aneta Panuszko, Jacek Namieśnik, Piotr Paweł Wieczorek
The main aim of this work was to conduct the preliminary/basic research concerning the preparation process of a new dummy molecularly imprinted polymer (DMIP) materials. Developed DMIPs were proposed as a sorption material in solid-phase extraction (SPE) technique for recognition of selected low mass polybrominated diphenyl ethers (PBDEs) - PBDE-47 and PBDE-99. Four new DMIPs were synthesized employing bulky polymerization technique by application of structural analogue of low mass PBDEs - 4,4'-Dihydroxydiphenyl ether, as a dummy template...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032775/transduction-of-interaction-between-trace-tryptophan-and-surface-confined-chromium-salen-using-impedance-spectroscopy-a-sensing-device-that-works-based-on-highly-selective-inhibition-of-mediator-s-faradaic-process
#3
Mojtaba Shamsipur, Avat Arman Taherpour, Hashem Sharghi, Afshin Pashabadi
It is known that tryptophan (Trp) tends to be electropolymerized over a potential window that is mostly applied for voltammetric determination of Trp. Furthermore, over the applied potential range, most of Trp-sensors suffer from some possible interferences. Knowing these challenges motivated us to establish a novel sensing device able to monitor Trp before approaching the mentioned potential range, decreasing memory-effects and some sources of non-linearity during electrochemical measurements. However, considering its molecular structure, it is unrealistic to expect tryptophan oxidation in negative potentials...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032774/improved-electroanalytical-characteristics-for-the-determination-of-pesticide-metobromuron-in-the-presence-of-nanomaterials
#4
Karolina Sipa, Mariola Brycht, Andrzej Leniart, Agnieszka Nosal-Wiercińska, Sławomira Skrzypek
In the present work, bare ultra trace graphite electrode (UTGE), UTGE modified with multi-walled carbon nanotubes (UTGE-MWCNTs), and UTGE modified with graphene nanoplatelets (UTGE-GNPs) were considered as working electrodes. For the first time, the UTGEs were modified with MWCNTs and GNPs by simple and fast drop-casting approach (the whole procedures take no more times than ca. 30 min). The comprehensive microscopic and electrochemical characterization of the unmodified and the modified UTGEs was conducted by means of atomic force microscopy (AFM), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV) techniques...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032773/detection-of-pesticide-residues-fenitrothion-in-fruit-samples-based-on-niobium-carbide-molybdenum-nanocomposite-an-electrocatalytic-approach
#5
Mani Govindasamy, Umamaheswari Rajaji, Shen-Ming Chen, Sakthivel Kumaravel, Tse-Wei Chen, Fahad M A Al-Hemaid, M Ajmal Ali, Mohamed Soliman Elshikh
We have reported an effective electrochemical sensor for assorted pesticide (i.e., Fenitrothion). Exact tracking of these pesticides has become more important for protecting the environment and food resources owing to their high toxicity. Hence, the development of compatible sensors for the real-time detection of pesticides is imperative to overcome practical limitations encountered in conventional methodologies. In this regard, the role of the novel, advanced functional materials such as niobium carbide (NbC) supported on molybdenum nanoparticles (NbC@Mo) has drawn great consideration in conventional sensory systems because of their numerous advantages over other nanomaterials...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032772/known-value-constraint-in-multivariate-curve-resolution
#6
Mahsa Akbari Lakeh, Hamid Abdollahi
Multivariate curve resolution (MCR) methods are powerful chemometric approaches that have been significantly involved to study the complex chemical systems. The accuracy of MCR results is directly related to the applied constraints which determine the properties of the resolved profiles. Constraints have been, and still are, an active field of research in MCR studies. Different constraints have different impacts on the range of feasible solutions, so it is important to study the effect of each constraint, to examine its compliance with physico-chemical principles, and to find sufficient conditions to ensure unique solutions...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032771/development-of-hybrid-extreme-learning-machine-based-chemo-metrics-for-precise-quantitative-analysis-of-libs-spectra-using-internal-reference-pre-processing-method
#7
Taoreed O Owolabi, Mohammed A Gondal
Laser induced breakdown spectroscopy (LIBS) is a versatile spectroscopic technique that requires little or no sample preparation and capable of simultaneous elemental sample analysis. Quantitative analysis of its spectra has been a major challenge due to self-absorption of the emitted radiation during plasma cooling and inadequate description of non-linear complex interactions taking place in the laser induced plasma. This work presents a novel chemo-metric tool, extreme learning machine (ELM) and its hybrid HHELM (homogenously hybridized ELM), for the first time in modeling the complex interactions of laser induced plasma and quantification of LIBS spectra...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032770/laser-ablation-inductively-coupled-plasma-mass-spectrometry-imaging-a-personal-identification-based-on-a-gunshot-residue-analysis-on-latent-fingerprints
#8
Tomáš Pluháček, Martin Švidrnoch, Vítězslav Maier, Vladimír Havlíček, Karel Lemr
A new laser ablation inductively coupled plasma mass spectrometry imaging (LA-ICP-MSI) method has been developed to visualize latent fingerprint of suspect persons possibly related to a criminal offence committed with a gun. Metallic impurities and metallic gunshot residues (GSRs) adhered on a latent fingerprint can link biometric information and shooting. The identification and spatial distribution of characteristic gunshot-related metals (Cu, Zn, Sb, Ba, Hg, Pb) was studied in detail. Observed limits of detection for the corresponding metals were below 0...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032769/preparation-and-application-of-ratiometric-polystyrene-based-microspheres-as-oxygen-sensors
#9
Lanfeng Liang, Gang Li, Zhipeng Mei, Jiayan Shi, Yongyun Mao, Tingting Pan, Chengzhu Liao, Jianbo Zhang, Yanqing Tian
Mono-dispersed polystyrene-based microspheres with diameters about 1 μm encapsulating rhodamine moieties as oxygen insensitive internal reference probes and platinum octaethylporphyrin units as oxygen sensitive probes were synthesized as new ratiometric oxygen sensors (Rhod-PtOEP-PS). The dual luminophors of rhodamines and platinum porphyrin moieties exhibited emissions maxima at 585 nm and 644 nm, respectively. The microspheres showed good oxygen sensing properties in different oxygen partial pressures (pO2 ) and dissolved oxygen (DO) concentrations...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032768/green-and-cost-effective-synthesis-of-carbon-dots-from-date-kernel-and-their-application-as-a-novel-switchable-fluorescence-probe-for-sensitive-assay-of-zoledronic-acid-drug-in-human-serum-and-cellular-imaging
#10
Niloufar Amin, Abbas Afkhami, Leila Hosseinzadeh, Tayyebeh Madrakian
A new label-free, sensitive and selective off and on signaling fluorescence platform for assay of trace levels of Zoledronic acid (ZA) drug in human biological samples based on nitrogen doped carbon dots (N-CDs) - ferric ions (Fe3+ ) was designed. The fluorescence probe, N-CDs, was synthesized for the first time through a facile, eco-friendly and one-step hydrothermal treatment using date kernel as the precursor without any need to use chemical reagents. These CDs exhibited excellent water solubility, ionic and photo stability in various circumstances and a highly relative quantum yield of 12...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032767/a-near-infrared-fluorescent-probe-for-selective-and-quantitative-detection-of-fluoride-ions-based-on-si-rhodamine
#11
Man Du, Baolong Huo, Jiemin Liu, Mengwen Li, Leqiu Fang, Yunxu Yang
A highly selective fluorescent probe (SiROPS) based on Si-rhodamine (SiR) towards F- was investigated. SiROPS can realize the NIR detection of F- because of the long fluorescent wavelength (λex  = 650 nm, λem  = 669 nm). The near-IR optical and the ratiometric fluorescence type signaling were realized by employing fluoride-selective cleavage of the latent thiophosphinated probe in mixed aqueous media. The cleavage of F- to the ortho positions of dimethylphosphinothionyl group in the meso aryl involves the suppression of internal rotation upon phosphorylation of a reactive phenolate and the activating rotation of o-OH, which resulting in a large fluorescence "Turn-Off" response...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032766/noninvasive-detection-of-changes-in-cells-cytosol-conductivity-by-combining-dielectrophoresis-with-optical-tweezers
#12
Mihaela Georgeta Moisescu, Tudor Savopol, Liviu Dimitriu, Jaka Cemazar, Eugenia Kovacs, Mihai Radu
Cellular electrical properties are modulated by various physical and/or chemical stresses and detection of these changes is a challenging issue. Optical tweezers (OT) and dielectrophoresis (DEP) are frequently integrated to devices dedicated to the investigation of cells properties. Here we provide a technique to detect changes in cytosol conductivity of cells by using a combination of DEP and OT. The method was exemplified for the case of cells electroporation and is based on balancing the DEP force by a controlled OT force...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032765/sensitive-multiplex-detection-of-whole-bacteria-using-self-assembled-cell-binding-domain-complexes
#13
Seok-Joon Kwon, Domyoung Kim, Inseon Lee, Jahyun Nam, Jungbae Kim, Jonathan S Dordick
Detecting bacterial cells at low levels is critical in public health, the food industry and first response. Current processes typically involve laborious cell lysis and genomic DNA extraction to achieve 100-1000 CFU mL-1 levels for detecting gram-positive bacteria. As an alternative to DNA-based methods, cell wall binding domains (CBDs) derived from lysins having a modular structure with an N-terminal catalytic domain and a C-terminal CBD, can be used to detect bacterial pathogens as a result of their exceptionally specific binding to target bacteria with great avidity...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032764/polymerase-assisted-fluorescence-resonance-energy-transfer-fret-assay-for-simultaneous-detection-of-binary-viral-sequences
#14
Sin-Cih Sun, Chun-Ching Lee, Min-Chieh Chuang
The analysis of a specific sequence of nucleic acids enables identification of pathogens and the diagnosis of human genetic disorders. This emphasises the need to develop methods of detecting nucleic acids, particularly in a multiplex format, that yield a decisive conclusion for clinical interpretation. Herein, we introduce a polymerase-assisted fluorescence resonance energy transfer (FRET) assay to simultaneously analyse binary viral genes that are characteristic of hemagglutinin and neuraminidase in influenza A virus...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032763/a-label-free-fluorescent-aptasensor-for-detection-of-kanamycin-based-on-dsdna-capped-mesoporous-silica-nanoparticles-and-rhodamine-b
#15
Shahrzad Dehghani, Noor Mohammad Danesh, Mohammad Ramezani, Mona Alibolandi, Parirokh Lavaee, Mojgan Nejabat, Khalil Abnous, Seyed Mohammad Taghdisi
Kanamycin is an aminoglycoside antibiotic that can be useful against both gram negative and positive bacteria. However, if its serum levels are not controlled properly, it can cause serious side effects like ototoxicity and nephrotoxicity. The aim of this study was to design a simple and rapid fluorescent aptasensor for detection of kanamycin, based on Aptamer/Complementary strand (dsDNA)-capped mesoporous silica nanoparticles (MSNs) and Rhodamine B as a fluorescent probe. The MSNs pores were filled with Rhodamine B and then gated with dsDNA...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032762/controlled-pore-glass-based-oligonucleotide-affinity-support-towards-high-throughput-screening-methods-for-the-identification-of-conformation-selective-g-quadruplex-ligands
#16
Chiara Platella, Domenica Musumeci, Angela Arciello, Filippo Doria, Mauro Freccero, Antonio Randazzo, Jussara Amato, Bruno Pagano, Daniela Montesarchio
Target selectivity is one of the main challenges in the search for small molecules able to act as effective and non-toxic anticancer and/or antiviral drugs. To achieve this goal, handy, rapid and reliable High Throughput Screening methodologies are needed. We here describe a novel functionalization for the solid phase synthesis of oligonucleotides on Controlled Pore Glass, including a flexible hexaethylene glycol spacer linking the first nucleoside through the nucleobase via a covalent bond stable to the final deprotection step...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032761/high-throughput-screening-of-pahs-and-polar-trace-contaminants-in-water-matrices-by-direct-solid-phase-microextraction-coupled-to-a-dielectric-barrier-discharge-ionization-source
#17
Anna Katarina Huba, Mario F Mirabelli, Renato Zenobi
Ambient mass spectrometry enables fast and direct analysis, requiring minimal or no sample preparation; these attributes have established it as the preferred technique for applications in numerous fields (e.g., biomedical, forensic, and environmental). Here we coupled an active capillary plasma ionization source based on a dielectric barrier discharge directly to solid-phase microextraction, achieving a quick (<10 min per sample), green (virtually no samples preparation and thus no solvents involved), sensitive (LODs up to 3 pg mL-1 ), robust (RSD of <20%), and quantitative (LDR ≥ 2 orders of magnitude) screening method...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032760/determination-of-organic-microcontaminants-in-agricultural-soils-irrigated-with-reclaimed-wastewater-target-and-suspect-approaches
#18
A B Martínez-Piernas, P Plaza-Bolaños, E García-Gómez, P Fernández-Ibáñez, A Agüera
Water scarcity is a problem worldwide, affecting specially countries with desert/semi-desert areas and low/irregular rainfall. In this context, reuse of reclaimed wastewater (RWW) for agricultural irrigation is undoubtedly a key strategy to reduce fresh water consumption. It is well-known that current wastewater treatments do not effectively remove organic microcontaminants (OMCs), and research in water analysis of OMCs is extensive. However, the focus on agricultural soils irrigated with RWW as potential recipients of OMCs and potential sources of OMCs to crops is still in their beginnings...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032759/development-and-validation-of-a-multidimensional-gas-chromatography-combustion-isotope-ratio-mass-spectrometry-based-test-method-for-analyzing-urinary-steroids-in-doping-controls
#19
Marlen Putz, Thomas Piper, Alessandro Casilli, Francisco Radler de Aquino Neto, Fausto Pigozzo, Mario Thevis
The misuse of the steroid hormone testosterone for performance enhancement has been frequently reported in the past, and its administration is prohibited in sports according to the regulations of the World Anti-Doping Agency (WADA). Testosterone is produced endogenously in human. Endogenous and exogenous testosterone together with their metabolites can be unambiguously distinguished by means of their carbon isotope ratios if compared to endogenous reference compounds. Established isotope ratio mass spectrometry methods for analyzing urinary steroids for doping control purposes consist of up to two time-consuming HPLC purification steps to achieve the required purity of all analytes...
November 7, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/30032758/a-review-on-human-fecal-metabolomics-methods-applications-and-the-human-fecal-metabolome-database
#20
REVIEW
Naama Karu, Lu Deng, Mordechai Slae, An Chi Guo, Tanvir Sajed, Hien Huynh, Eytan Wine, David S Wishart
Metabolomic analysis of human biospecimens had progressed quickly over the past decade. Technological and methodological advances have led to the comprehensive characterization of human serum, urine, cerebrospinal fluid and saliva metabolomes, and the creation of freely available metabolome reference databases. Unfortunately, the characterization of the human fecal metabolome still lags behind these other metabolomes in terms of the availability of standardized methods and freely available resources. The purpose of this review is to bring the knowledge of the human fecal metabolome, and the methods to characterize it, to the same level as most other human biofluid metabolomes...
November 7, 2018: Analytica Chimica Acta
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