A review on human fecal metabolomics: Methods, applications and the human fecal metabolome database.
Abstract 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 cha...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Karu N, Deng L, Slae M, Guo AC, Sajed T, Huynh H, Wine E, Wishart DS Tags: Anal Chim Acta Source Type: research

Development and validation of a multidimensional gas chromatography/combustion/isotope ratio mass spectrometry-based test method for analyzing urinary steroids in doping controls.
Abstract 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-co...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Putz M, Piper T, Casilli A, Radler de Aquino Neto F, Pigozzo F, Thevis M Tags: Anal Chim Acta Source Type: research

Determination of organic microcontaminants in agricultural soils irrigated with reclaimed wastewater: Target and suspect approaches.
This study aims to apply a target and a suspect approach for the multi-residue monitoring of OMCs in agricultural soils and a soilless subtract, both irrigated with RWW for more than ten years. The study involved, firstly, the development and validation of an extraction method for target analysis of 73 OMCs using a QuEChERS-based method and liquid chromatography coupled to quadrupole-linear ion trap mass spectrometry (LC-QqLIT-MS/MS); and secondly, the application of a suspect workflow for the screening of a list of 1300 potential contaminants using LC coupled to quadrupole-time-of-flight MS (LC-QTOF-MS). The results demon...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Martínez-Piernas AB, Plaza-Bolaños P, García-Gómez E, Fernández-Ibáñez P, Agüera A Tags: Anal Chim Acta Source Type: research

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.
Abstract 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 (
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Huba AK, Mirabelli MF, Zenobi R Tags: Anal Chim Acta Source Type: research

Controlled Pore Glass-based oligonucleotide affinity support: towards High Throughput Screening methods for the identification of conformation-selective G-quadruplex ligands.
Abstract 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. This allowed us preparing fully deprotected oligonucleotides still covalently...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Platella C, Musumeci D, Arciello A, Doria F, Freccero M, Randazzo A, Amato J, Pagano B, Montesarchio D Tags: Anal Chim Acta Source Type: research

A label-free fluorescent aptasensor for detection of kanamycin based on dsDNA-capped mesoporous silica nanoparticles and Rhodamine B.
Abstract 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. In the presence of kanamycin, the aptamer sequence was separate...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Dehghani S, Danesh NM, Ramezani M, Alibolandi M, Lavaee P, Nejabat M, Abnous K, Taghdisi SM Tags: Anal Chim Acta Source Type: research

Polymerase-assisted fluorescence resonance energy transfer (FRET) assay for simultaneous detection of binary viral sequences.
Abstract 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. The approach takes advantage of the formation of an X-shaped four-way DNA junction (4W...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Sun SC, Lee CC, Chuang MC Tags: Anal Chim Acta Source Type: research

Sensitive multiplex detection of whole bacteria using self-assembled cell binding domain complexes.
Abstract 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. We have developed a highly sens...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Kwon SJ, Kim D, Lee I, Nam J, Kim J, Dordick JS Tags: Anal Chim Acta Source Type: research

Noninvasive detection of changes in cells' cytosol conductivity by combining dielectrophoresis with optical tweezers.
Abstract 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. We observed a decrease of the DEP force in the case of electroporated cells whic...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Moisescu MG, Savopol T, Dimitriu L, Cemazar J, Kovacs E, Radu M Tags: Anal Chim Acta Source Type: research

A near-infrared fluorescent probe for selective and quantitative detection of fluoride ions based on Si-Rhodamine.
Abstract 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...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Du M, Huo B, Liu J, Li M, Fang L, Yang Y Tags: Anal Chim Acta Source Type: research

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.
Abstract 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 12.5%. In the pr...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Amin N, Afkhami A, Hosseinzadeh L, Madrakian T Tags: Anal Chim Acta Source Type: research

Preparation and application of ratiometric polystyrene-based microspheres as oxygen sensors.
Abstract 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. It was found the oxygen probes and reference p...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Liang L, Li G, Mei Z, Shi J, Mao Y, Pan T, Liao C, Zhang J, Tian Y Tags: Anal Chim Acta Source Type: research

Laser ablation inductively coupled plasma mass spectrometry imaging: A personal identification based on a gunshot residue analysis on latent fingerprints.
te;ček V, Lemr K Abstract 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 0.3 ng cm-2. The distribution...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Pluháček T, Švidrnoch M, Maier V, Havlíček V, Lemr K Tags: Anal Chim Acta Source Type: research

Development of hybrid extreme learning machine based chemo-metrics for precise quantitative analysis of LIBS spectra using internal reference pre-processing method.
Abstract 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 la...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Owolabi TO, Gondal MA Tags: Anal Chim Acta Source Type: research

Known-value constraint in multivariate curve resolution.
In this study, we focus on known-value constraint and the requirements for reducing the range of feasible solutions under this constraint. In addition, several theoretical rules are presented to determine the minimum number of required known-values in order to get a unique solution. The theory of known-values was accessed using several simulated and experimental datasets. As shown previously, known-value information can be applied in quantitative analysis of first-order data. The prediction performance of MCR-ALS method under known-value constraint was compared to the results of the well stablished partial least squares (P...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Akbari Lakeh M, Abdollahi H Tags: Anal Chim Acta Source Type: research

Detection of Pesticide Residues (Fenitrothion) in Fruit Samples Based On Niobium Carbide@Molybdenum Nanocomposite: An Electrocatalytic Approach.
Abstract 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 sen...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Govindasamy M, Rajaji U, Chen SM, Kumaravel S, Chen TW, Al-Hemaid FMA, Ali MA, Elshikh MS Tags: Anal Chim Acta Source Type: research

Improved electroanalytical characteristics for the determination of pesticide metobromuron in the presence of nanomaterials.
Abstract 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...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Sipa K, Brycht M, Leniart A, Nosal-Wiercińska A, Skrzypek S Tags: Anal Chim Acta Source Type: research

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.
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. Anal Chim Acta. 2018 Nov 07;1030:70-76 Authors: Shamsipur M, Taherpour AA, Sharghi H, Pashabadi A Abstract 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 challen...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Shamsipur M, Taherpour AA, Sharghi H, Pashabadi A Tags: Anal Chim Acta Source Type: research

Preparation and characterization of dummy-template molecularly imprinted polymers as potential sorbents for the recognition of selected polybrominated diphenyl ethers.
Abstract 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. The DMIPs and corresponding non-imprinted polymers were prepared u...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Marć M, Panuszko A, Namieśnik J, Wieczorek PP Tags: Anal Chim Acta Source Type: research

Facile preparation of microporous organic polymers functionalized macroporous hydrophilic resin for selective enrichment of glycopeptides.
Abstract 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, 1...
Source: Analytica Chimica Acta - July 25, 2018 Category: Chemistry Authors: Li Y, Wang H, You X, Ma S, Dong J, Wei Y, Ou J, Ye M Tags: Anal Chim Acta Source Type: research

A lab-on-a-tip approach to make electroanalysis user-friendly and de-centralized: Detection of copper ions in river water.
duini F Abstract The development of portable and user-friendly sensing platforms is a hot topic in the field of analytical chemistry. Among others, electroanalytical approaches exhibit a high amenability for reaching this purpose, i.e. the commercial strips for diabetes care are an obvious success. However, providing fully-integrated and user-friendly methods is the leitmotiv. In this work we evaluate the use of a disposable pipette tip, opportunely configured, to realize the first example of lab-on-a-tip. The combination of a pipette tip, wire electrodes, and cotton wool filter, highlights the suitability of prod...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Cinti S, Mazzaracchio V, Öztürk G, Moscone D, Arduini F Tags: Anal Chim Acta Source Type: research

Study of a complex secondary metabolites with potent anti-radical activity by two dimensional TLC/HPLC coupled to electrospray ionization time-of-flight mass spectrometry and bioautography.
Abstract The high performance liquid chromatography (HPLC) coupled to electrospray ionization (ESI) octopole orthogonal acceleration time-of-flight (TOF) mass spectrometry (MS) was developed to separate secondary metabolites belonging to different groups of compounds with a wide range of polarity, i.e. phenolic acids, flavonoids, sesquiterpenes and others present in minute amounts, in a single run. Moreover, application of ESI-TOF-MS with a simple in source type of fragmentation and high mass accuracy measurements (around 2 ppm) in both positive and negative ionization modes with different and optimized fragment...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Wojtanowski KK, Mroczek T Tags: Anal Chim Acta Source Type: research

Centrifugal partition chromatography a first dimension for biomass fast pyrolysis oil analysis.
Abstract Biomass fast pyrolysis oils contain molecules having a large variety of chemical functions and a wide range of molecular weights (from several tens to several thousand grams per mole). The good knowledge of their complex composition is essential for optimizing the conversion of bio-oils to biofuels, thereby requiring powerful separation techniques. In this work, we investigate the interest of centrifugal partition chromatography (CPC) as a first dimension for the analysis of a bio-oil. A CPC method is proposed to separate oxygen containing compounds according to their partition coefficients in the solvent...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Le Masle A, Santin S, Marlot L, Chahen L, Charon N Tags: Anal Chim Acta Source Type: research

Corrigendum to "Advances in sensing and biosensing of bisphenols: A review" [ACA 998 (2018) 1-27].
Corrigendum to "Advances in sensing and biosensing of bisphenols: A review" [ACA 998 (2018) 1-27]. Anal Chim Acta. 2018 Oct 31;1029:125-129 Authors: Dhanjai, Sinha A, Wu L, Lu X, Chen J, Jain R PMID: 29907284 [PubMed - in process] (Source: Analytica Chimica Acta)
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Dhanjai, Sinha A, Wu L, Lu X, Chen J, Jain R Tags: Anal Chim Acta Source Type: research

Cost-effective synthesis of three-dimensional nitrogen-doped nanostructured carbons with hierarchical architectures from the biomass of sea-tangle for the amperometric determination of ascorbic acid.
Abstract In this work, the three-dimensional nitrogen-doped nanostructured carbons with hierarchical architectures (3D-NNCsHAs) with high density of defective sites, high surface area and pluralities of pore size distributions was prepared through the pyrolysis of sea-tangle (Laminaria japonica), an inexpensive, eco-friendly and abundant precursor. Benefitting from their structural uniqueness, a selective and sensitive ascorbic acid (AA) sensor based on 3D-NNCsHAs was developed. Compared to the glassy carbon electrode (GCE) and the carbon nanotubes modified GCE (CNTs/GCE), the 3D-NNCsHAs modified GCE (3D-NNCsHAs/G...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Hei Y, Li X, Zhou X, Liu J, Hassan M, Zhang S, Yang Y, Bo X, Wang HL, Zhou M Tags: Anal Chim Acta Source Type: research

A novel mode of DNA assembly at electrode and its application to protein quantification.
Abstract Sensitive and specific detection of protein is of great significance for early diagnosis and prognosis of many diseases. However, great challenges remain unsolved including relative low sensitivity, high cost, long testing time, complicated instrument and laborious operation. To improve the performance of protein detection methods, development of fine reaction interface for recognition and signal amplification is of great importance. In this work, we construct a novel mode of DNA assembly at electrode interface based on a tripodal surface anchor and an electrochemical aptasensor for protein assay is devel...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Ding S, Gu Z, Yan R, Tang Y, Miao P Tags: Anal Chim Acta Source Type: research

Low-cost Scholl-coupling microporous polymer as an efficient solid-phase microextraction coating for the detection of light aromatic compounds.
Abstract A cost-effective microporous polymer was synthesized using cheap monomer and catalyst via one-step Scholl-coupling reaction, and its chemical, morphological characteristics and pore structure were investigated. The as-synthesized polymer with large surface area and narrow pore distribution (centered in 1.2 nm) was prepared as a fiber coating for solid-phase microextraction (SPME). Headspace SPME was used for the extraction of the light aromatic compounds, e.g. benzene, toluene, ethylbenzene, m-xylene, naphthalene and acenaphthene. The parameters influencing the extraction and desorption efficiencies, su...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Xie X, Wang J, Zheng J, Huang J, Ni C, Cheng J, Hao Z, Ouyang G Tags: Anal Chim Acta Source Type: research

Colorimetric ionophore-based coextraction titrimetry of potassium ions.
Abstract Potassium ion concentration can be successfully determined volumetrically by moving the titration from a homogeneous phase to a two phase solvent system. This is because potassium can be readily complexed in a selective and thermodynamically stable manner by ionophores such as valinomycin. Previous work demonstrated the successful titration of potassium by ion-exchange into an organic phase containing valinomycin, but the sample itself served as titrant, which is not sufficiently practical for routine applications. This problem is overcome here by a co-extraction based approach, with the sodium salt of th...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Thajee K, Wang L, Grudpan K, Bakker E Tags: Anal Chim Acta Source Type: research

Normal-inverse bimodule operation Hadamard transform ion mobility spectrometry.
Abstract In order to suppress or eliminate the spurious peaks and improve signal-to-noise ratio (SNR) of Hadamard transform ion mobility spectrometry (HT-IMS), a normal-inverse bimodule operation Hadamard transform - ion mobility spectrometry (NIBOHT-IMS) technique was developed. In this novel technique, a normal and inverse pseudo random binary sequence (PRBS) was produced in sequential order by an ion gate controller and utilized to control the ion gate of IMS, and then the normal HT-IMS mobility spectrum and the inverse HT-IMS mobility spectrum were obtained. A NIBOHT-IMS mobility spectrum was gained by subtrac...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Hong Y, Huang C, Liu S, Xia L, Shen C, Chu Y Tags: Anal Chim Acta Source Type: research

Comprehensive evaluation of untargeted metabolomics data processing software in feature detection, quantification and discriminating marker selection.
In this study, we acquired a benchmark dataset from standard mixtures consisting of 1100 compounds with specified concentration ratios including 130 compounds with significant variation of concentrations. Five software evaluated here (MS-Dial, MZmine 2, XCMS, MarkerView, and Compound Discoverer) showed similar performance in detection of true features derived from compounds in the mixtures. However, significant differences between untargeted metabolomics software were observed in relative quantification of true features in the benchmark dataset. MZmine 2 outperformed the other software in terms of quantification accuracy a...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Li Z, Lu Y, Guo Y, Cao H, Wang Q, Shui W Tags: Anal Chim Acta Source Type: research

Bifunctional aptamer-mediated catalytic hairpin assembly for the sensitive and homogenous detection of rare cancer cells.
Abstract The presence of cancer cells in body fluids confirms the occurrence of metastasis and guides treatment. A simple, fast, and homogeneous fluorescent method was developed to detect cancer cells based on catalytic hairpin assembly (CHA) and bifunctional aptamers. The bifunctional aptamer had a recognition domain for binding to target cancer cells and an initiator domain for triggering the CHA reaction. In the presence of target cells, the bifunctional aptamer was released from the inhibitor and initiated a cascade reaction of assembly and disassembly of the hairpins. Separation of the fluorophores from the q...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Liu J, Zhang Y, Zhao Q, Situ B, Zhao J, Luo S, Li B, Yan X, Vadgama P, Su L, Ma W, Wang W, Zheng L Tags: Anal Chim Acta Source Type: research

Nanobody-based dual epitopes protein identification (DepID) assay for measuring soluble CD38 in plasma of multiple myeloma patients.
CONCLUSION: We have developed a Nb-based luminescence sandwich assay, named as DepID, for quantification of the soluble CD38 in MM patients' plasma and showed the potency of this method as a tool for general diagnosis of MM or companion diagnosis of the CD38-targeted therapies. PMID: 29907292 [PubMed - in process] (Source: Analytica Chimica Acta)
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Li T, Li SL, Fang C, Hou YN, Zhang Q, Du X, Lee HC, Zhao YJ Tags: Anal Chim Acta Source Type: research

A homogeneous, Anti-dsDNA antibody-based assay for multicolor detection of cancer stem cell transcription factors.
Abstract Cancer stem cells (CSCs) are responsible for maintaining tumor growth, metastasis and recurrence. The high expression of cancer stem cell transcription factors (Oct4, Sox2 and Nanog) is a valuable prognostic factor, suggesting a higher risk of tumor recurrence and metastasis. So, the development of a convenient and cost-effective method for multiplex assay of these transcription factors (TFs) is highly required. In this work, we have proposed a universal homogeneous assay for multicolor detection of these TFs based on anti-dsDNA antibody-decorated Fe3O4 magnetite nanoparticles (aadMNPs). In the presence o...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Ma J, Shi H, Zhang M, Li C, Xiang Y, Liu P Tags: Anal Chim Acta Source Type: research

New colorimetric aptasensor for rapid on-site detection of Campylobacter jejuni and Campylobacter coli in chicken carcass samples.
Abstract Campylobacter is the most common cause of infectious intestinal disease, with nearly all cases caused by two species: C. jejuni and C. coli. We recently reported a gold nanoparticle-based two-stage aptasensing platform, which was improved in the present study for the rapid and on-site detection of both C. jejuni and C. coli in food samples. Compared to the previous platform, the improved platform yielded a more obvious colour change from red to purple due to the aggregation of gold nanoparticles, and does not require additional time or a pH optimization step for the aptamers to be adso...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Kim YJ, Kim HS, Chon JW, Kim DH, Hyeon JY, Seo KH Tags: Anal Chim Acta Source Type: research

Interfacial potential barrier driven electrochemical detection of Cr6.
Abstract 3D NiO/polyaniline p-p junction foam was prepared and applied for electrochemical detection of Cr6+. The electrochemical detection using interfacial potential barrier was illustrated and a mature theoretical model was built to demonstrate the mechanism. Electrochemical sensing signals of targets can be revealed by changing the height of potential barrier after specific adsorption. The extra high sensitivity (0.78 μA nM-1) and low detection limit (3.96 × 10-4 nM) of Cr6+ were achieved by applying the p-p junction interfacial potential barrier as driven factors. This work proposes a model...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: He Y, Zhao M, Yu M, Zhuang Y, Cheng F, Chen S Tags: Anal Chim Acta Source Type: research

Surface enhanced Raman spectroscopy based immunosensor for ultrasensitive and selective detection of wild type p53 and mutant p53R175H.
Abstract p53 is a powerful transcription factor playing a pivotal role in the prevention of cancer development and in maintaining genome integrity. This oncosuppressor is found to be functionally inactivated by mutations in many human tumors. Accordingly, wild type p53 and its oncogenic mutants represent valuable cancer biomarkers for diagnostic and prognostic purposes. We developed a highly sensitive biosensor, based on Surface Enhanced Raman Spectroscopy, for detection of wild type p53 and of p53R175H, which is one of the most frequent tumor-associated mutants of p53. Our approach combines the huge Raman signal ...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Bizzarri AR, Moscetti I, Cannistraro S Tags: Anal Chim Acta Source Type: research

Readily prepared iminocoumarin for rapid, colorimetric and ratiometric fluorescent detection of phosgene.
Abstract In this paper, a new colorimetric and ratiometric fluorescent probe for the rapid detection of phosgene is reported. This probe is based on a readily prepared and highly fluorescent iminocoumarin, which reacts rapidly with phosgene to form a cyclic carbamate product to produce, distinctive colorimetric and ratiometric fluorescent signal changes. The detection of phosgene with this probe is fast (complete within 2 min), highly selective and sensitive with a detection limit of 27 nM in solution. Moreover, this probe can be used to prepare easy-to-use paper test strips for convenient visual and fluoresce...
Source: Analytica Chimica Acta - June 18, 2018 Category: Chemistry Authors: Feng W, Gong S, Zhou E, Yin X, Feng G Tags: Anal Chim Acta Source Type: research

Modern data science for analytical chemical data - A comprehensive review.
Abstract Efficient and reliable analysis of chemical analytical data is a great challenge due to the increase in data size, variety and velocity. New methodologies, approaches and methods are being proposed not only by chemometrics but also by other data scientific communities to extract relevant information from big datasets and provide their value to different applications. Besides common goal of big data analysis, different perspectives and terms on big data are being discussed in scientific literature and public media. The aim of this comprehensive review is to present common trends in the analysis of chemical...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Szymańska E Tags: Anal Chim Acta Source Type: research

Characterization of polymer-coated CdSe/ZnS quantum dots and investigation of their behaviour in soil solution at relevant concentration by asymmetric flow field-flow fractionation - multi angle light scattering - inductively coupled plasma - mass spectrometry.
espes G Abstract A careful separation, identification and characterization of polymer-coated quantum dots (P-QDs) in complex media such as soil solution is the key point to understand their behaviour and to accurately predict their fate in the environment. In the present study, a synthesized CdSe/ZnS core/shell P-QDs suspension, proved to be stable for at least six months, was investigated with respect to P-QDs dimension, structure and elemental composition. Separation of P-QDs and size distribution determination were carried out by Asymmetric Flow Field-Flow Fractionation (AF4) - Multi Angle Light Scattering (MAL...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Faucher S, Charron G, Lützen E, Le Coustumer P, Schaumlöffel D, Sivry Y, Lespes G Tags: Anal Chim Acta Source Type: research

Behavior of selenium hydride in heated quartz tube and dielectric barrier discharge atomizers.
ina J Abstract Atomization of SeH2 in an externally heated multiple microflame quartz tube atomizer (MMQTA) as well as planar dielectric barrier discharge (DBD) atomizer was investigated using a variety of probes. Deposits of Se on inner surfaces of the atomizers were quantified and their distribution visualized by autoradiography with 75Se radiotracer. The gas phase fraction of Se transported beyond the confines of the atomizers was also determined. In the MMQTA, a 15% mass fraction of Se was deposited in a narrow zone at both colder ends of the optical arm (100-400 °C). By contrast, a 25-40% mass fraction ...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Kratzer J, Musil S, Marschner K, Svoboda M, Matoušek T, Mester Z, Sturgeon RE, Dědina J Tags: Anal Chim Acta Source Type: research

Covalent bonding of Schiff base network-1 as a stationary phase for capillary electrochromatography.
Abstract Covalent organic frameworks (COFs), featuring low densities, high surface areas, and good thermal and chemical stabilities, are gradually attracting interest in the field of analytical chemistry. A type of microporous polymer network material named Schiff base network-1 (SNW-1) was introduced into a capillary column through covalent bonding. The obtained SNW-1-coated capillary column was characterized by thermogravimetric analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. Then, the SNW-1-coated capillary column was successfully utilized for the open-tub...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Ye N, Wang X, Liu Q, Hu X Tags: Anal Chim Acta Source Type: research

Use of exogenous volatile organic compounds to detect Salmonella in milk.
In this study, exogenous VOCs liberated by Salmonella strains have been identified and quantified via head space-solid phase microextraction gas chromatography mass spectrometry (HS-SPME-GC-MS) in milk samples. The specific enzymes targeted for detection and/or differentiation of Salmonella were C8 esterase, α-galactosidase and pyrrolidonyl peptidase using the following enzyme substrates: 2-chlorophenyl octanoate, phenyl α-d-galactopyranoside and L-pyrrollidonyl fluoroanilide, respectively. Detection of the exogenous VOCs, 2-chlorophenol, phenol and 3-fluoraniline was possible with typical limits of detection o...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Bahroun NHO, Perry JD, Stanforth SP, Dean JR Tags: Anal Chim Acta Source Type: research

Based on ZnSe quantum dots labeling and single particle mode ICP-MS coupled with sandwich magnetic immunoassay for the detection of carcinoembryonic antigen in human serum.
Abstract A highly sensitive sandwich-type magnetic immunoassay based on inductively coupled plasma mass spectrometry detection in single particle mode, with ZnSe Quantum dots (QDs) serving as model tags, was proposed. The transient signals induced by the flash of ions (64Zn+) in the plasma torch from the ionization of nanoparticles tagged on antibody were recorded in a single particle mode. The frequency of transient signals is directly related to the concentration of nanoparticle tags, and the concentration of nanoparticle tagged antibodies can be quantified by the frequency of transient signals. Amino-modified m...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Cao Y, Mo G, Feng J, He X, Tang L, Yu C, Deng B Tags: Anal Chim Acta Source Type: research

Benzophenone used as the photochemical reagent for pinpointing C=C locations in unsaturated lipids through shotgun and liquid chromatography-mass spectrometry approaches.
In this study, we comprehensively evaluated the conditions of the PB reaction and screened benzophenone as a new PB reagent. Benzophenone possesses unique advantages, such as a relative high PB yield; the PB products could be readily distinguished from the reacted lipids based on the added high molecular weight (182 Da); and the benzophenone does not affect the lipids appearance interval for reversed-phase column separation. Furthermore, we optimized the reaction conditions by using benzophenone as a PB reagent and summarized the molecular formulas of the diagnostic ions according to the fragment rules. The proposed PB m...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Xu T, Pi Z, Song F, Liu S, Liu Z Tags: Anal Chim Acta Source Type: research

A novel label-free fluorescent sensor for highly sensitive detection of bleomycin based on nitrogen-doped graphene quantum dots.
Abstract In this work, we presented a novel label-free biosensor for rapid detection of bleomycinsulphate (BLM). The biosensor was based on the fluorescent "turn off-on" of nitrogen-doped graphene quantum dots (N-GQDs), which was prepared in a green way from citric acid and ammonia. The richness of carboxyl groups on the N-GQDs enabled strong adsorption of ssDNA to the surface of N-GQDs through π-π stacking interactions, resulting in the effective fluorescence quenching of N-GQDs system. The ssDNA underwent an irreversible cleavage event via the oxidative effect of BLM with Fe(II) as a cofactor, th...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Liu X, Na W, Liu Q, Su X Tags: Anal Chim Acta Source Type: research

Use of MPA-capped CdS quantum dots for sensitive detection and quantification of Co2+ ions in aqueous solution.
ie M Abstract Water soluble CdS quantum dots (QDs) were synthesized by a simple aqueous chemical route using mercaptopropionic acid (MPA) as a stabilizer. These QDs had a fluorescence emission band maximum at 540 nm with a FWHM ∼130 nm and a quantum yield of ∼12%. Transmission electronic microscopy images were used to determine the QD diameter of 8.9 ± 0.4 nm. From this value we calculated the molecular mass M(QD) = 1.17 × 106 g mol-1 and the extinction coefficient at the band edge (450 nm) ε450 = 4.7 × 106 cm-1 M-1, which allowed to determine ...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Bel Haj Mohamed N, Ben Brahim N, Mrad R, Haouari M, Ben Chaâbane R, Negrerie M Tags: Anal Chim Acta Source Type: research

Enzyme-linked immunosorbent assays for therapeutic drug monitoring coumarin oral anticoagulants in plasma.
Abstract The development of high-throughput immunochemical assays to assist on precision medicine for patients treated with coumarin oral anticoagulants (OA) is reported. The assays are able to quantitate Warfarin (W) and/or Acenocoumarol (ACL) directly in plasma samples without any previous sample pretreatment. The detectabilities (W, 3.52 ± 2.25 nM and ACL, 1.56 ± 0.64 nM) and the working ranges achieved (W, 1.19 ± 0.73 to 12.05 ± 2.99 nM and ACL 0.63 ± 0.20 to 10.19 ± 6.69 nM) are within the therapeutic levels usually found in patients tr...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Salvador JP, Tassies D, Reverter JC, Marco MP Tags: Anal Chim Acta Source Type: research

The aptamer-thrombin-aptamer sandwich complex-bridged gold nanoparticle oligomers for high-precision profiling of thrombin by dark field microscopy.
We present a simple and efficient colorimetric assay strategy for ultrasensitive visual detection of human α-thrombin, which is essentially based on the formation of the DNA1-thrombin-DNA2 sandwich complex-bridged gold nanoparticle (Au NP) oligomers. Unlike the traditional colorimetric sensing strategies which induced the nanoparticle aggregates with uncontrolled aggregate size. In this work, the DNA1with rich G bases was firstly conjugated on the surfaces of Au NPs fixed on the hexadecyl trimethylammonium bromide (CTAB)-coated glass slide, and thrombin was captured by the DNA1. Then, the other DNA2 with rich G bases...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Li J, Jiao Y, Liu Q, Chen Z Tags: Anal Chim Acta Source Type: research

Novel epoxy-silica nanoparticles to develop non-enzymatic colorimetric probe for analytical immuno/bioassays.
Abstract We have developed a novel method to develop epoxy silica nanoparticles (EfSiNP) in a single pot. High surface coverage of epoxy functional groups between 150 and 57000 molecules per particles (∼1013-1016 molecules/mL of 200 nm EfSiNPs) was achieved for different preparation conditions. We then created a red colored probe by conjugating Fuchsin dye to the epoxy functionalities of EfSINPs. Anti-mouse IgG was co-immobilized with Fuchsin and their ratios were optimized for achieving optimum ratios by testing those in functional assays. Dye to antibody ratios were in good negative correlation with a coef...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Dixit CK, Bhakta S, Macharia J, Furtado J, Suib SL, Rusling JF Tags: Anal Chim Acta Source Type: research

High-frequency, dielectric spectroscopy for the detection of electrophysiological/biophysical differences in different bacteria types and concentrations.
Abstract This paper describes a novel technique to quantify and identify bacterial cultures of Bacillus Subtilis (2.10-1.30 × 109 CFU mL-1) and Escherichia Coli (1.60-1.00 × 109 CFU mL-1), in corn oil using dielectric spectroscopy at elevated frequencies of 0.0100-20.0 GHz. This technique is using the electrophysiological/biophysical differences (e.g. gram positive and gram negative) between various bacteria types, as a basis to distinguish between bacteria concentrations and bacteria types. A close-ended, coaxial probe of 20.0 mm long sample-holder was developed and used to calcula...
Source: Analytica Chimica Acta - June 11, 2018 Category: Chemistry Authors: Russel M, Sophocleous M, JiaJia S, Xu W, Xiao L, Maskow T, Alam M, Georgiou J Tags: Anal Chim Acta Source Type: research