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https://www.readbyqxmd.com/read/28738664/bomb-swab-can-trace-explosive-particle-sampling-and-detection-be-improved
#1
Danny Fisher, Raya Zach, Yossef Matana, Paz Elia, Shiran Shustack, Yarden Sharon, Yehuda Zeiri
The marked increase in international terror in recent years requires the development of highly efficient methods to detect trace amounts of explosives at airports, border crossings and check points. The preferred analytical method worldwide is the ion mobility spectrometry (IMS) that is capable of detecting most explosives at the nano-gram level. Sample collection for the IMS analysis is based on swabbing of a passenger's belongings to collect possible explosive residues. The present study examines a wide range of issues related to swab-based particle collection and analysis, in the hope of gaining deeper understanding into this technique that will serve to improve the detection process...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738660/novel-biomimetic-enzyme-for-sensitive-detection-of-superoxide-anions
#2
Fang Peng, Tingting Xu, Fan Wu, Chunxue Ma, Yuhong Liu, Jianying Li, Bo Zhao, Chun Mao
Superoxide anion (O2(•-)), one of the most active reactive oxygen species (ROS) in micro-environment of the human body, is involved in some diseases if there is excess O2(•-) associated with oxidative stress. Accurate detection of its concentration has important medical diagnostic significance. In this work, a new electrochemical sensor was designed and fabricated for sensitive detection based on Mn-superoxide dismutase (MnSOD) that decorated onto the surface of magnetic polymeric nanotubes by surface self-assembly processes...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738659/sample-treatment-in-m%C3%A3-ssbauer-spectroscopy-for-protein-related-analyses-nondestructive-possibilities-to-look-inside-metal-containing-biosystems
#3
Alexander A Kamnev, Anna V Tugarova
In this review, the unique possibilities are considered of the (57)Fe transmission (TMS) and (57)Co emission (EMS) variants of Mössbauer (nuclear γ-resonance) spectroscopy as nondestructive techniques with minimal sample preparation/treatment and a significant analytical potential, with a focus on the analysis of cation-binding sites in metalloproteins. The techniques are shown to provide unique structural and quantitative information on the coordination microenvironment, the chemical state and transformations of the Mössbauer nuclides in sophisticated metal-containing proteins, including those within complicated supramolecular structures, and in microbial cells or tissues...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738654/development-of-a-sensitive-and-quantitative-uhplc-ms-ms-method-to-study-the-whole-body-uptake-of-pharmaceuticals-in-zebrafish
#4
Stanislav Kislyuk, Jerome Kroonen, Erwin Adams, Patrick Augustijns, Peter de Witte, Deirdre Cabooter
An analytical procedure to measure the whole-body uptake of pharmaceuticals in zebrafish has been developed using state-of-the-art methodologies. A sample preparation procedure for 9 pharmaceuticals displaying a variety in physicochemical properties was developed using 10-day old zebrafish (TG898). For an efficient homogenization of the samples and subsequent recovery of the compounds of interest, different amounts of organic solvents in combination with acidic modifiers were added to zebrafish samples. Samples were subsequently processed using a powerful bath sonicator and centrifuged...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738652/volatile-composition-of-merlot-red-wine-and-its-contribution-to-the-aroma-optimization-and-validation-of-analytical-method
#5
Stefany Grützmann Arcari, Vinicius Caliari, Marla Sganzerla, Helena Teixeira Godoy
A methodology for the determination of volatile compounds in red wine using headspace solid phase microextraction (HS-SPME) combined with gas chromatography-ion trap/ mass spectrometry (GC-IT/MS) and flame ionization detector (GC -FID) was developed, validated and applied to a sample of Brazilian red wine. The optimization strategy was conducted using the Plackett-Burman design for variable selection and central composite rotational design (CCRD). The response surface methodology showed that the performance of the extraction of the volatile compounds using divinylbenzene/carboxen/polydimethylsiloxane (DVB/CAR/PDMS) fiber is improved with no sample dilution, the addition of 30% NaCl, applying an extraction temperature of 56°C and extraction time of 55min...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738648/matrix-interference-evaluation-employing-gc-and-lc-coupled-to-triple-quadrupole-tandem-mass-spectrometry
#6
S Uclés, A Lozano, A Sosa, P Parrilla Vázquez, A Valverde, A R Fernández-Alba
Gas and liquid chromatography coupled to triple quadrupole tandem mass spectrometry are currently the most powerful tools employed for the routine analysis of pesticide residues in food control laboratories. However, whatever the multiresidue extraction method, there will be a residual matrix effect making it difficult to identify/quantify some specific compounds in certain cases. Two main effects stand out: (i) co-elution with isobaric matrix interferents, which can be a major drawback for unequivocal identification, and therefore false negative detections, and (ii) signal suppression/enhancement, commonly called the "matrix effect", which may cause serious problems including inaccurate quantitation, low analyte detectability and increased method uncertainty...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738647/development-of-an-analytical-methodology-for-obtaining-quantitative-mass-concentrations-from-laap-tof-ms-measurements
#7
Rachel Gemayel, Brice Temime-Roussel, Nathalie Hayeck, Adrien Gandolfo, Stig Hellebust, Sasho Gligorovski, Henri Wortham
Laser ablation aerosol particle-time of flight mass spectrometer (LAAP-ToF-MS) measures the size number of particles, and chemical composition of individual particles in real-time. LAAP-ToF-MS measurements of chemical composition are difficult to quantify, mostly because the instrument sensitivities to various chemical species in the multicomponent atmospheric aerosol particles are unknown. In this study, we investigate a field-based approach for quantitative measurements of ammonium, nitrate, sulfate, OC, and EC, in size-segregated atmospheric aerosols, by LAAP-ToF-MS using concurrent measurements from high-resolution time-of-flight aerosol mass spectrometer (HR-ToF-AMS), and multi-angle absorption photometer (MAAP)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738646/synthesis-characterization-and-application-of-a-novel-multifunctional-stationary-phase-for-hydrophilic-interaction-reversed-phase-mixed-mode-chromatography
#8
Hayriye Aral, K Serdar Çelik, Ramazan Altındağ, Tarık Aral
A novel multifunctional stationary phase based on silica gel was synthesised starting from L- isoleucine and 4-phenylbutylamine and evaluated as a hydrophilic interaction/reversed-phase mixed-mode stationary phase for high-performance liquid chromatography (HPLC). The prepared stationary phase was characterized by elemental analysis, infrared spectroscopy (IR), scanning electron microscopy (SEM), Brunauer, Emmett and Teller (BET) and solid-state (13)C nuclear magnetic resonance (NMR). The mechanisms involved in the chromatographic separation are multi-interaction, including hydrophobic, π-π, hydrogen-bonding, dipole-dipole and ion-dipole interactions...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738641/an-interference-free-and-label-free-sandwich-type-magnetic-silicon-microsphere-rgo-based-probe-for-fluorescence-detection-of-microrna
#9
Shiyu Li, Kui He, Rong Liao, Chunyan Chen, Xiaoming Chen, Changqun Cai
An interference-free and label-free sensing platform was developed for the highly sensitive detection of microRNA-21 (miRNA-21) in vitro by magnetic silicon microsphere (MNP)-reduced graphene oxide (rGO)-based sandwich probe. In this method, DNA capture probes (P1) were connected with MNPs at the 5' end and hybridized with completely complementary target miRNA. Subsequently, rGO was retained and induced the fluorescence quenching in the supernatant. Through the magnetic separation, the supernatant environment was simplified and the interference to analytical signal was eliminated...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738639/a-colorimetric-indicator-displacement-assay-for-cysteine-sensing-based-on-a-molecule-exchange-mechanism
#10
Zhonghua Xue, Xiaoxia Fu, Honghong Rao, Mohammed Hassan Ibrahim, Lulu Xiong, Xiuhui Liu, Xiaoquan Lu
In this study, we developed an ingenious yet effective strategy for cysteine detection. The colorimetric cysteine assay is established through an indicator displacement process, where Cu(2+) and pyrocatechol violet (PV) was employed as receptor and indicator, respectively. Proof-of-concept trials demonstrated that the stronger binding affinity of Cu(2+) receptor toward cysteine than PV indicator endowed our colorimetric sensor with high selectivity and excellent sensitivity as well as with a lower detection limit (4...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738638/mixed-matrix-membranes-incorporated-with-ln-mof-for-selective-and-sensitive-detection-of-nitrofuran-antibiotics-based-on-inner-filter-effect
#11
Feng Zhang, Hua Yao, Yifan Zhao, Xing Li, Gaowei Zhang, Yangyi Yang
The detection of antibiotics is critical and challenging due to the pervasive use of antibiotics had inevitably brought some negative impacts on ecosystem and human health. Herein, we reported an anti-interfere ability enhanced luminescent sensor of lanthanide metal-organic framework (Ln-MOF) filled mixed matrix membranes (MMMs), which combining the processibility of poly(methyl methacrylate) (PMMA) polymer with Ln-MOF of {[Tb2(AIP)2(H2O)10]·(AIP)·4H2O}n (Tb-AIP, where AIP is 5-aminoisophthalate) fillers...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738636/one-step-hydrothermal-synthesis-and-characterization-of-moss-like-mwcnt-bi2s3-nanomaterial-for-solid-phase-extraction-of-copper
#12
Zainab Manzoor Memon, Erkan Yilmaz, Mustafa Soylak
The present work was designed with the aim to one step simple hydrothermal synthesis of moss like MWCNT-Bi2S3 nanomaterial as solid phase extraction sorbent for separation, preconcentration and determination of copper in tobacco and food samples. Cu(II) ions was strongly retained on the MWCNT-Bi2S3 nanomaterial at the pH 7.0 and was successfully desorbed by using 1.5mL of 4M HNO3. The copper concentration in eluent was determined by flame atomic absorption spectrometer. The certified reference material (NC SZC 73033 Scallion) was analyzed for the verification and accuracy of the proposed method...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738635/microwave-induced-combustion-thermal-and-morphological-aspects-for-understanding-the-mechanism-of-ignition-process-for-analytical-applications
#13
Matheus F Pedrotti, Leticia S F Pereira, Cezar A Bizzi, Jose N G Paniz, Juliano S Barin, Erico M M Flores
In the present work, for the first time a systematic study was performed using an infrared camera and scanning electron microscopy (SEM) coupled to energy dispersive X-ray spectrometry (EDS) to evaluate the mechanisms involved in microwave-induced combustion method, which has been extensively used for sample preparation. Cellulose and glass fiber discs, wetted with the igniter solution (6molL(-1) NH4NO3), were evaluated under microwave field in a monomode system. The temperature of the discs surface was recorded during microwave irradiation and the effect of NH4NO3 concentration and irradiation time on cellulose oxidation was evaluated...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738634/determination-of-synthetic-phosphodiesterase-5-inhibitors-by-lc-ms-2-in-waters-and-human-urine-submitted-to-dispersive-liquid-liquid-microextraction
#14
Natalia Campillo, Javier Marín, José Fenoll, Isabel Garrido, Ignacio López-García, Manuel Hernández-Córdoba, Pilar Viñas
High-performance liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS(2)) with a triple quadrupole is proposed for determining the synthetic phosphodiesterase-5 inhibitors, sildenafil, tadalafil and vardenafil, and the active metabolite N-desmethyl sildenafil. The method was successfully applied to the analysis of waters of different origins and human urine samples. Dispersive liquid-liquid microextraction (DLLME) was applied in the classical way for water analysis, whereas a previous extraction into an organic solvent was necessary for urine samples, the acetonitrile extract being used as dispersant solvent in the DLLME step...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738632/raman-hyperspectral-imaging-in-conjunction-with-independent-component-analysis-as-a-forensic-tool-for-explosive-analysis-the-case-of-an-atm-explosion
#15
Mariana Ramos Almeida, Lucio Paulo Lima Logrado, Jorge Jardim Zacca, Deleon Nascimento Correa, Ronei Jesus Poppi
In this work, Raman hyperspectral imaging, in conjunction with independent component analysis, was employed as an analytical methodology to detect an ammonium nitrate fuel oil (ANFO) explosive in banknotes after an ATM explosion experiment. The proposed methodology allows for the identification of the ANFO explosive without sample preparation or destroying the sample, at quantities as small as 70μgcm(-2). The explosive was identified following ICA data decomposition by the characteristic nitrate band at 1044cm(-1)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738631/a-review-aptamer-based-analytical-strategies-using-the-nanomaterials-for-environmental-and-human-monitoring-of-toxic-heavy-metals
#16
REVIEW
Leila Farzin, Mojtaba Shamsipur, Shahab Sheibani
Recent developments in biotechnology offer the new methods for the sensitive detection of heavy metals based on the affinity and specificity of aptamers, as nucleic acid ligands selected from random sequence pools in vitro. Heavy metals have received considerable importance as the most toxic metallic pollutants which may cause serious environmental damages. They are classified as trace elements because of their presence in trace concentrations in various environmental matrices. Thus, the precise and sensitive methods to detect heavy metals are important to ensure human and environment safety...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738629/innovative-simple-and-green-ultrasound-assisted-enzyme-based-hydrolytic-microextraction-method-for-manganese-at-trace-levels-in-food-samples
#17
Erkan Yilmaz, Mustafa Soylak
We describe the usage of hydrolytic enzymes for the innovative, green and simple microextraction of manganese in food samples. The ultrasound assisted-enzyme based hydrolytic microextraction method (UA-EH-ME) was applied for the separation and determination of manganese in food samples prior to its micro-sampling flame atomic absorption spectrometric determination (MS-FAAS). Analytical parameters influenced on the enzyme based hydrolytic microextraction method such as pH, type of enzyme, amount of enzyme, temperature and time of ultrasonic waves were fully evaluated and optimized by using mg level of NCS ZC73033 scallion certified reference material...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738628/mip-meps-based-sensing-strategy-for-the-selective-assay-of-dimethoate-application-to-wheat-flour-samples
#18
D Capoferri, M Del Carlo, N Ntshongontshi, E I Iwuoha, M Sergi, F Di Ottavio, D Compagnone
The aim of this work was to demonstrate the potentialities of the use of a molecularly imprinted (MIP) sensor coupled to a microextraction by packed sorbent (MEPS) strategy for the selective and sensitive detection of dimethoate in real samples. A dimethoate-polypyrrole MIP film was realised by cyclic voltammetry (CV) on the surface of a glassy carbon electrode (GCE). Being dimethoate electro-inactive, K3[Fe(CN)6] was used as probe for the indirect quantification of the analyte via the decrease of redox peaks observed upon binding of the target analyte...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738626/elimination-of-interference-from-water-in-kbr-disk-ft-ir-spectra-of-solid-biomaterials-by-chemometrics-solved-with-kinetic-modeling
#19
Sherald H Gordon, Rogers E Harry-O'kuru, Abdellatif A Mohamed
Infrared analysis of proteins and polysaccharides by the well known KBr disk technique is notoriously frustrated and defeated by absorbed water interference in the important amide and hydroxyl regions of spectra. This interference has too often been overlooked or ignored even when the resulting distortion is critical or even fatal, as in quantitative analyses of protein secondary structure, because the water has been impossible to measure or eliminate. Therefore, a new chemometric method was devised that corrects spectra of materials in KBr disks by mathematically eliminating the water interference...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738624/multiplexed-analysis-combining-distinctly-sized-cdte-mpa-quantum-dots-and-chemometrics-for-multiple-mutually-interfering-analyte-determination
#20
Dayana B Bittar, David S M Ribeiro, Ricardo N M J Páscoa, José X Soares, S Sofia M Rodrigues, Rafael C Castro, Leonardo Pezza, Helena R Pezza, João L M Santos
Semiconductor quantum dots (QDs) have demonstrated a great potential as fluorescent probes for heavy metals monitoring. However, their great reactivity, whose tunability could be difficult to attain, could impair selectivity yielding analytical results with poor accuracy. In this work, the combination in the same analysis of multiple QDs, each with a particular ability to interact with the analyte, assured a multi-point detection that was not only exploited for a more precise analyte discrimination but also for the simultaneous discrimination of multiple mutually interfering species, in the same sample...
November 1, 2017: Talanta
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