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Analytical and Bioanalytical Chemistry

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https://www.readbyqxmd.com/read/29026983/quartz-crystal-microbalance-as-an-assay-to-detect-anti-drug-antibodies-for-the-immunogenicity-assessment-of-therapeutic-biologics
#1
Evan A Dubiel, Tamás Fülöp, Sylvain Vigier, Patrick Vermette
Because of their biological origins, therapeutic biologics can trigger an unwanted deleterious immune response with some patients. The immunogenicity of therapeutic biologics can affect drug efficacy and patient safety by the production of circulating anti-drug antibodies (ADA). In this study, quartz crystal microbalance (QCM) was developed as an assay to detect ADA. Etanercept (Enbrel®) was covalently grafted to dextran-modified QCM surfaces. Rabbits were immunized with etanercept to generate ADA. Results showed the QCM assay could detect purified ADA from rabbits at concentrations as low as 50 ng/mL, within the sensitivity range of ELISA...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026979/hpaec-pad-for-oligosaccharide-analysis-novel-insights-into-analyte-sensitivity-and-response-stability
#2
Matthias Mechelke, Jonathan Herlet, J Philipp Benz, Wolfgang H Schwarz, Vladimir V Zverlov, Wolfgang Liebl, Petra Kornberger
The rising importance of accurately detecting oligosaccharides in biomass hydrolyzates or as ingredients in food, such as in beverages and infant milk products, demands for the availability of tools to sensitively analyze the broad range of available oligosaccharides. Over the last decades, HPAEC-PAD has been developed into one of the major technologies for this task and represents a popular alternative to state-of-the-art LC-MS oligosaccharide analysis. This work presents the first comprehensive study which gives an overview of the separation of 38 analytes as well as enzymatic hydrolyzates of six different polysaccharides focusing on oligosaccharides...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026956/peptide-self-assembly-assisted-signal-labeling-for-an-electrochemical-assay-of-protease-activity
#3
Xiangyang Miao, Huizhen Yu, Zhun Gu, Lili Yang, Jiahuan Teng, Ya Cao, Jing Zhao
Peptide self-assembly holds tremendous promise for a range of applications in chemistry and biology. In the work reported here, we explored the potential functions of peptide self-assembly in electrochemical bioanalysis by developing a peptide self-assembly assisted signal labeling strategy for assaying protease activity. The fundamental principle of this assay is that target-protease-catalyzed specific proteolytic cleavage blocks self-assembly between the probe peptide and signal peptide, thus preventing the signal labeling of electroactive silver nanoparticles on the electrode surface, which in turn causes the electrochemical signal to decrease...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026954/selective-extraction-and-determination-of-chlorogenic-acids-as-combined-quality-markers-in-herbal-medicines-using-molecularly-imprinted-polymers-based-on-a-mimic-template
#4
Wenhua Ji, Mingming Zhang, Huijiao Yan, Hengqiang Zhao, Yan Mu, Lanping Guo, Xiao Wang
We describe a solid-phase extraction adsorbent based on molecularly imprinted polymers (MIPs), prepared with use of a mimic template. The MIPs were used for the selective extraction and determination of three chlorogenic acids as combined quality markers for Lonicera japonica and Lianhua qingwen granules. The morphologies and surface groups of the MIPs were assessed by scanning electron microscopy, Brunauer-Emmett-Teller surface area analysis, and Fourier transform infrared spectroscopy. The adsorption isotherms, kinetics, and selectivity of the MIPs were systematically compared with those of non-molecularly imprinted polymers...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026953/application-of-molecularly-imprinted-polymers-for-the-analysis-of-polycyclic-aromatic-hydrocarbons-in-lipid-matrix-based-biological-samples
#5
Ying Sun, Yiming Pang, Jingxu Zhang, Zhiwen Li, Jufen Liu, Bin Wang
High-accuracy analyses of polycyclic aromatic hydrocarbons (PAHs) in lipid matrix-based biological samples are highly necessary. We investigated the cleanup performance of the commercially available molecularly imprinted polymers (MIPs) to analyze PAHs in various biological samples (i.e., butter, peanut oil, pork belly, and human umbilical cord), and compared this method with the commonly used gel permeation chromatography (GPC). After primary cleanup with a MIP or GPC column, the extracts were further cleaned with a neutral aluminum oxide column...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026952/spatially-and-angularly-resolved-spectroscopy-for-in-situ-estimation-of-concentration-and-particle-size-in-colloidal-suspensions
#6
Yi-Chieh Chen, David Foo, Nicolau Dehanov, Suresh N Thennadil
Successful implementation of process analytical technology (PAT) hinges on the ability to make continuous or frequent measurements in-line or at-line of critical product attributes such as composition and particle size, the latter being an important parameter for particulate processes such as suspensions and emulsions. A novel probe-based spatially and angularly-resolved diffuse reflectance measurement (SAR-DRM) system is proposed. This instrument, along with appropriate calibration models, is designed for online monitoring of concentration of chemical species and particle size of the particulate species in process systems involving colloidal suspensions...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026944/improving-elution-strategies-for-chelex%C3%A2-dgt-passive-samplers
#7
Delphine Devillers, Rémy Buzier, Adeline Charriau, Gilles Guibaud
Elution of Chelex® binding layers, commonly used for the diffusive gradients in thin films technique (DGT), is recognized as the most important contributor to the uncertainty of DGT measurements. Limiting uncertainty requires the use of optimized procedures and suitable elution recoveries (f e ). This work therefore investigated elution robustness to propose improved strategies. A wide range of conditions were investigated for the main elution parameters (Chelex® particle size, elution time, Chelex® loading, and eluent concentration and volume) on Al(III), Cd(II), Co(II), Cr(III), Cu(II), Ni(II), Pb(II), and Zn(II)...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29026940/advanced-bioanalytics-for-precision-medicine
#8
Aldo Roda, Elisa Michelini, Cristiana Caliceti, Massimo Guardigli, Mara Mirasoli, Patrizia Simoni
Precision medicine is a new paradigm that combines diagnostic, imaging, and analytical tools to produce accurate diagnoses and therapeutic interventions tailored to the individual patient. This approach stands in contrast to the traditional "one size fits all" concept, according to which researchers develop disease treatments and preventions for an "average" patient without considering individual differences. The "one size fits all" concept has led to many ineffective or inappropriate treatments, especially for pathologies such as Alzheimer's disease and cancer...
October 12, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29018931/analytical-evaluation-of-sensor-measurements
#9
Günter Gauglitz
No abstract text is available yet for this article.
October 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29018930/a-highly-selective-electrochemical-sensor-based-on-molecularly-imprinted-polypyrrole-modified-gold-electrode-for-the-determination-of-glyphosate-in-cucumber-and-tap-water
#10
Chao Zhang, Yongxin She, Tengfei Li, Fengnian Zhao, Maojun Jin, Yirong Guo, Lufei Zheng, Shanshan Wang, Fen Jin, Hua Shao, Haijin Liu, Jing Wang
An electrochemical sensor based on molecularly imprinted polypyrrole (MIPPy) was developed for selective and sensitive detection of the herbicide glyphosate (Gly) in cucumber and tap water samples. The sensor was prepared via synthesis of molecularly imprinted polymers on a gold electrode in the presence of Gly as the template molecule and pyrrole as the functional monomer by cyclic voltammetry (CV). The sensor preparation conditions including the ratio of template to functional monomers, number of CV cycles in the electropolymerization process, the method of template removal, incubation time, and pH were optimized...
October 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29018901/rapid-determination-of-the-emerging-contaminant-oxypurinol-in-surface-water-using-solid-phase-extraction-followed-by-ultra-high-performance-liquid-chromatography-with-fluorescence-detection
#11
Tianci Xu
A method has been developed for the trace analysis of oxypurinol that is considered as an active pharmaceutical ingredient and an emerging environmental contaminant. The method achieved the identification and quantification of oxypurinol in surface water samples utilizing solid phase extraction and ultra high-performance liquid chromatography with diode array and fluorescence detection for the first time. Four principal parameters of solid phase extraction were optimized to obtain maximum extraction efficiency...
October 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29018900/reliable-quantification-of-1-2-dihydroxynaphthalene-in-urine-using-a-conjugated-reference-compound-for-calibration
#12
Melanie Zobel, Thomas Göen, Vladimir Belov, Katrin Klotz
After environmental and occupational exposure to naphthalene, 1,2-dihydroxynaphthalene (1,2-DHN) was shown to be one major metabolite in human naphthalene metabolism. However, the instability of free 1,2-DHN complicates the reliable determination of this promising biomarker in urine. To solve this stability problem, glucuronide conjugates of 1,2-DHN and the corresponding isotopically labelled D6-1,2-dihydroxynaphthalene (D6-1,2-DHN) were synthesised and applied as reference material and internal standard in a gas chromatographic-tandem mass spectrometric (GC-MS/MS) method...
October 10, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28975377/upconversion-fluorescence-immunoassay-for-imidaclothiz-by-magnetic-nanoparticle-separation
#13
Xiude Hua, Hongjie You, Peiwen Luo, Zhexuan Tao, He Chen, Fengquan Liu, Minghua Wang
A sensitive fluorescence immunoassay for the detection of imidaclothiz was established by using magnetic nanoparticles (MNPs) as concentration elements and upconversion nanoparticles (UCNPs) as signal labels. The NaYF4/Yb,Er UCNPs and MNPs were conjugated with imidaclothiz monoclonal antibody and imidaclothiz antigen, respectively. Imidaclothiz could compete with the antigen-conjugated MNPs for binding to the antibody-conjugated UCNPs and resulted in a decreased fluorescence signal when the MNPs were separated by an external magnet...
October 3, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28975375/high-resolution-continuum-source-graphite-furnace-molecular-absorption-spectrometry-compared-with-ion-chromatography-for-quantitative-determination-of-dissolved-fluoride-in-river-water-samples
#14
Philip Ley, Manfred Sturm, Thomas A Ternes, Björn Meermann
In addition to beneficial health effects, fluoride can also have adverse effects on humans, animals, and plants if the daily intake is strongly elevated. One main source of fluoride uptake is water, and thus several ordinances exist in Germany that declare permissible concentrations of fluoride in, for example, drinking water, mineral water, and landfill seepage water. Controlling the fluoride concentrations in aqueous matrices necessitate valid and fast analytical methods. In this work an alternative method for the determination of fluoride in surface waters based on high-resolution continuum source graphite furnace molecular absorption spectrometry (HR-CS-GFMAS) was applied...
October 3, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28975371/bithiophenic-maldi-matrices-as-valuable-leads-for-the-selective-detection-of-alkaloids
#15
Ali Jaber, Denis Seraphin, David Guilet, Junichi Osuga, Edmond Cheble, Ghassan Ibrahim, Pascal Richomme, Andreas Schinkovitz
Alkaloids represent a group of biologically most interesting compounds commonly used in modern medicines but also known for exhibiting severe toxic effects. Therefore, the detection of alkaloids is an important issue in quality control of plants, dietary supplements, and herbal pharmaceutical and mostly facilitated by methods such as GC or LC-MS. However, benefitting from the development of selective matrices as well as requiring very little sample preparation, MALDI-MS may also provide a valuable supplement to these standard analytical methods...
October 3, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28971257/nitrogen-doped-carbon-quantum-dots-as-a-fluorescence-probe-combined-with-magnetic-solid-phase-extraction-purification-for-analysis-of-folic-acid-in-human-serum
#16
Meng Wang, Yang Jiao, Chunsheng Cheng, Jianhao Hua, Yaling Yang
A novel and sensitive method based on nitrogen-doped carbon quantum dots as a fluorescence probe coupled with magnetic solid-phase extraction (MSPE) purification for analysis of folic acid (FA) in human serum samples has been established for the first time. In the developed system, magnetic nanoparticles coated with hexanoic acid (Fe3O4@C6) were synthesized by a one-step chemical co-precipitation method with good magnetic properties and dispersibility for sample purification, and it is better to be separated from the sample...
October 2, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28971240/development-of-a-paper-based-lateral-flow-immunoassay-for-simultaneous-detection-of-lipopolysaccharides-of-salmonella-serovars
#17
Florian Schenk, Patricia Weber, Julian Vogler, Lars Hecht, Andreas Dietzel, Günter Gauglitz
Lateral flow type detection is becoming interesting not only in regions with a poor medical infrastructure but also for practitioners in day-to-day clinical work or for veterinary control in case of possible epidemics. In this work, we describe the first steps of development of a multi-channel strip with potential internal calibration of multiparametric and colorimetric lateral flow assays for the simultaneous detection of the lipopolysaccharides (LPS) of Salmonella typhimurium (S. typhimurium) and Salmonella enteritidis (S...
October 2, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28971239/rapid-determination-of-free-prolyl-dipeptides-and-4-hydroxyproline-in-urine-using-flow-gated-capillary-electrophoresis
#18
Ning Zhang, Qingfu Zhu, Maojun Gong
Unhydrolyzed prolyl hydroxyproline (Pro-Hyp) and total 4-hydroxyproline (Hyp) in urine have been suggested as disease biomarkers for bone turnover and osteoporosis. Here, a rapid method was developed to accurately and selectively determine free prolyl compounds in unhydrolyzed urine samples. Urine samples were treated with o-phthalaldehyde to block primary amines followed by selective fluorogenic derivatization of secondary amines using 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) at room temperature. The derivatized mixture was then directly analyzed and quantitated on a flow-gated capillary electrophoresis system...
October 2, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28971237/preparation-of-a-pm2-5-like-reference-material-in-sufficient-quantities-for-accurate-monitoring-of-anions-and-cations-in-fine-atmospheric-dust
#19
Jean Charoud-Got, Giovanni Emma, John Seghers, Marie-France Tumba-Tshilumba, Anna Santoro, Andrea Held, James Snell, Håkan Emteborg
A reference material of a PM2.5-like atmospheric dust material has been prepared using a newly developed method. It is intended to certify values for the mass fraction of SO4(2-), NO3(-), Cl(-) (anions) and Na(+), K(+), NH4(+), Ca(2+), Mg(2+) (cations) in this material. A successful route for the preparation of the candidate reference material is described alongside with two alternative approaches that were abandoned. First, a PM10-like suspension was allowed to stand for 72 h. Next, 90% of the volume was siphoned off...
October 2, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28971225/online-coupling-of-immunoextraction-digestion-and-microliquid-chromatography-tandem-mass-spectrometry-for-the-analysis-of-sarin-and-soman-butyrylcholinesterase-adducts-in-human-plasma
#20
Maud Bonichon, Valentina Valbi, Audrey Combès, Charlotte Desoubries, Anne Bossée, Valérie Pichon
Organophosphorus nerve agent (OPNA) adducts formed with human butyrylcholinesterase (HuBuChE) can be used as biomarker of OPNA exposure. Indeed, intoxication by OPNAs can be confirmed by the LC/MS(2) analysis of a specific HuBuChE nonapeptide on which OPNAs covalently bind. A fast, selective, and highly sensitive online method was developed to detect sarin and soman adducts in plasma, including immunoextraction by anti-HuBuChE antibodies, pepsin digestion on immobilized enzyme reactors (IMER), and microLC/MS(2) analysis of the OPNA adducts...
October 2, 2017: Analytical and Bioanalytical Chemistry
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