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1. A graphene-based real-time fluorescent assay of deoxyribonuclease I activity and inhibition

Author:
Zhou, Zhixue; Zhu, Chengzhou; Ren, Jiangtao; Dong, Shaojun
Source:
Analytica chimica acta 2012 v.740 pp. 88-92
ISSN:
0003-2670
Subject:
cost effectiveness; deoxyribonuclease I; enzymatic reactions; fluorescein; fluorescence; graphene; hydrolysis; quantitative analysis; single-stranded DNA
Abstract:
... Using the remarkable difference in the affinity of graphene oxide (GO) with double strand DNA (dsDNA) and short DNA fragments, we report for the first time a GO-based nonrestriction nuclease responsive system. Our system was composed of GO and a fluorescent dye fluorescein amidite (FAM)-labeled dsDNA substrate (F-dsDNA). At first, the fluorescence of this F-dsDNA substrate was quenched upon additi ...
DOI:
10.1016/j.aca.2012.06.032

2. A high-throughput approach for the determination of pesticide residues in cucumber samples using solid-phase microextraction on 96-well plate

Author:
Bagheri, Habib; Es’haghi, Ali; Es-haghi, Ali; Mesbahi, Noushin
Source:
Analytica chimica acta 2012 v.740 pp. 36-42
ISSN:
0003-2670
Subject:
bitertanol; chlorpyrifos-methyl; cucumbers; detection limit; diazinon; gas chromatography-mass spectrometry; malathion; markets; mixing; monitoring; pesticide residues; phosalone; polytetrafluoroethylene; silicon; solid phase microextraction; solvents; stainless steel
Abstract:
... A high-throughput solid-phase microextraction (SPME) on 96-well plate together with gas chromatography–mass spectrometry (GC–MS) was developed for the determination of some selected pesticides in cucumber samples. Pieces with the length of 1.0cm of silicon tubing were precisely prepared and then coated on the end part of stainless steel wires. The prepared fibers were positioned in a home-made pol ...
DOI:
10.1016/j.aca.2012.06.001

3. A naked-eye based strategy for semiquantitative immunochromatographic assay

Author:
Zhang, Daohong; Li, Peiwu; Zhang, Qi; Li, Ran; Zhang, Wen; Ding, Xiaoxia; Li, Chang Ming
Source:
Analytica chimica acta 2012 v.740 pp. 74-79
ISSN:
0003-2670
Subject:
aflatoxin B1; antibodies; binding sites; cost effectiveness; detection limit; immunoaffinity chromatography; toxicity
Abstract:
... It is critical to develop a cost-effective quantitative/semiquantitative assay for rapid diagnosis and on-site detection of toxic or harmful substances. Here, a naked-eye based semiquantitative immunochromatographic strip (NSI-strip) was developed, on which three test lines (TLs, TL-I, TL-II and TL-III) were dispensed on a nitrocellulose membrane to form the test zone. Similar as the traditional s ...
DOI:
10.1016/j.aca.2012.06.015

4. Comparison of three different enrichment strategies for serum low molecular weight protein identification using shotgun proteomics approach

Author:
Capriotti, Anna Laura; Caruso, Giuseppe; Cavaliere, Chiara; Piovesana, Susy; Samperi, Roberto; Laganà, Aldo
Source:
Analytica chimica acta 2012 v.740 pp. 58-65
ISSN:
0003-2670
Subject:
biomarkers; blood serum; digestion; hydrocolloids; molecular weight; nanoparticles; peptides; proteins; proteolysis; proteome; proteomics; spectrometers; ultrafiltration
Abstract:
... Serum low-molecular weight (LMW) proteins potentially contain useful biological information and their identification can be used to discover novel potential biomarkers. Given the high complexity of serum samples, in the last years several different prefractionation and enrichment strategies have been developed. In this study three different methods, i.e. hydrogel nanoparticles, Proteominer® peptid ...
DOI:
10.1016/j.aca.2012.06.033

5. Determination of polycyclic aromatic hydrocarbons and their oxy-, nitro-, and hydroxy-oxidation products

Author:
Cochran, R.E.; Dongari, N.; Jeong, H.; Beránek, J.; Haddadi, S.; Shipp, J.; Kubátová, A.
Source:
Analytica chimica acta 2012 v.740 pp. 93-103
ISSN:
0003-2670
Subject:
air; derivatization; gas chromatography-mass spectrometry; ionization; methane; monitoring; oxidation; particulates; polycyclic aromatic hydrocarbons; smoke; solid phase extraction; temperature
Abstract:
... A sensitive method has been developed for the trace analysis of PAHs and their oxidation products (i.e., nitro-, oxy-, and hydroxy-PAHs) in air particulate matter (PM). Following PM extraction, PAHs, nitro-, oxy-, and hydroxy-PAHs were fractionated using solid phase extraction (SPE) based on their polarities. Gas chromatography–mass spectrometry (GC–MS) conditions were optimized, addressing inject ...
DOI:
10.1016/j.aca.2012.05.050

6. Evaluating the complexation behavior and regeneration of boron selective glucaminium-based ionic liquids when used as extraction solvents

Author:
Joshi, Manishkumar D.; Steyer, Daniel J.; Anderson, Jared L.
Source:
Analytica chimica acta 2012 v.740 pp. 66-73
ISSN:
0003-2670
Subject:
aqueous solutions; boron; hydrochloric acid; ionic liquids; liquid-phase microextraction; lithium; nuclear magnetic resonance spectroscopy; seawater; sodium chloride
Abstract:
... Glucaminium-based ionic liquids are a new class of solvents capable of extracting boron-species from water with high efficiency. The complexation behavior of these ILs with borate was thoroughly studied using ¹¹B NMR. Two different complexes, namely, monochelate complex and bischelate complex, were observed. ¹¹B NMR was used extensively to determine the formation constants for monochelate and bisc ...
DOI:
10.1016/j.aca.2012.06.035

7. High-performance liquid chromatography with fast-scanning fluorescence detection and multivariate curve resolution for the efficient determination of galantamine and its main metabolites in serum

Author:
Culzoni, María J.; Aucelio, Ricardo Q.; Escandar, Graciela M.
Source:
Analytica chimica acta 2012 v.740 pp. 27-35
ISSN:
0003-2670
Subject:
Alzheimer disease; acetonitrile; ammonium acetate; analytical chemistry; blood serum; cholinesterase; data collection; detection limit; fluorescence; high performance liquid chromatography; least squares; metabolites; patients; prediction; wavelengths
Abstract:
... Based on green analytical chemistry principles, an efficient approach was applied for the simultaneous determination of galantamine, a widely used cholinesterase inhibitor for the treatment of Alzheimer's disease, and its major metabolites in serum samples. After a simple serum deproteinization step, second-order data were rapidly obtained (less than 6min) with a chromatographic system operating i ...
DOI:
10.1016/j.aca.2012.06.034

8. Instrument and process independent binning and baseline correction methods for liquid chromatography–high resolution-mass spectrometry deconvolution

Author:
Krishnan, Shaji; Vogels, Jack T.W.E.; Coulier, Leon; Bas, Richard C.; Hendriks, Margriet W.B.; Hankemeier, Thomas; Thissen, Uwe
Source:
Analytica chimica acta 2012 v.740 pp. 12-19
ISSN:
0003-2670
Subject:
chromatography; mass spectrometry; metabolites; molecular weight; solvents; spectrometers; washing
Abstract:
... Setting appropriate bin sizes to aggregate hyphenated high-resolution mass spectrometry data, belonging to similar mass over charge (m/z) channels, is vital to metabolite quantification and further identification. In a high-resolution mass spectrometer when mass accuracy (ppm) varies as a function of molecular mass, which usually is the case while reading m/z from low to high values, it becomes a ...
DOI:
10.1016/j.aca.2012.06.014

9. Ion-pair sorptive extraction of perfluorinated compounds from water with low-cost polymeric materials: Polyethersulfone vs polydimethylsiloxane

Author:
Villaverde-de-Sáa, Eugenia; Racamonde, Inés; Quintana, José Benito; Rodil, Rosario; Cela, Rafael
Source:
Analytica chimica acta 2012 v.740 pp. 50-57
ISSN:
0003-2670
Subject:
carboxylic acids; desorption; detection limit; freshwater; ionic strength; liquid chromatography; pH; perfluorocarbons; polar compounds; polymers; prices; sewage; solvents; surface water; tandem mass spectrometry
Abstract:
... A method for the determination of seven perfluorinated carboxylic acids and perfluorooctane sulphonate (PFOS) in aqueous samples using low-cost polymeric sorptive extraction as sample preparation technique, followed by liquid chromatography–tandem mass spectrometry (LC–MS/MS) determination has been developed and validated. Simplicity of the analytical procedure, low volume of solvent and sample re ...
DOI:
10.1016/j.aca.2012.06.027

10. Miniaturization through lab-on-a-chip: Utopia or reality for routine laboratories? A review

Author:
Ríos, Ángel; Zougagh, Mohammed; Avila, Mónica
Source:
Analytica chimica acta 2012 v.740 pp. 1-11
ISSN:
0003-2670
Subject:
Biological Sciences; chemistry; medicine
Abstract:
... Micro total analysis (μTAS), also called “lab-on-a-chip (LOC)” technology, promises solutions for high throughput and highly specific analysis for chemistry, biology and medicine, while consuming only tiny amounts of samples, reactants and space. This article reports selected contributions of LOC, which represent clear practical approaches for routine work, or presenting potentiality to be transfe ...
DOI:
10.1016/j.aca.2012.06.024

11. Multiresidue determination of pesticides from aquatic media using polyaniline nanowires network as highly efficient sorbent for microextraction in packed syringe

Author:
Bagheri, Habib; Alipour, Noshin; Ayazi, Zahra
Source:
Analytica chimica acta 2012 v.740 pp. 43-49
ISSN:
0003-2670
Subject:
cetyltrimethylammonium bromide; desorption; detection limit; gas chromatography-mass spectrometry; micelles; microextraction; monitoring; multiresidue analysis; nanowires; pH; pesticides; polymers; river water; scanning electron microscopy; solvents; triazines
Abstract:
... A simple, rapid and sensitive method based on microextraction in packed syringe (MEPS), in combination with gas chromatography–mass spectrometry (GC–MS) was developed. Polyaniline (PANI) nanowires network was synthesized and used as sorbent of MEPS for the multiresidue determination of selected analytes from triazine, organochlrorine and organophosphorous pesticides in aqueous samples. The PANI na ...
DOI:
10.1016/j.aca.2012.06.026

12. Photoluminescent and electrochemiluminescent dual-signaling probe for bio-thiols based on a ruthenium(II) complex

Author:
Zhang, Wenzhu; Zhang, Run; Zhang, Jingmei; Ye, Zhiqiang; Jin, Dayong; Yuan, Jingli
Source:
Analytica chimica acta 2012 v.740 pp. 80-87
ISSN:
0003-2670
Subject:
aqueous solutions; biotechnology; cysteine; detection limit; diagnostic techniques; dose response; glutathione; image analysis; photoluminescence; ruthenium; thiols
Abstract:
... Photoluminescence (PL) and electrochemiluminescence (ECL) detection techniques are highly sensitive and widely used methods for clinical diagnostics and analytical biotechnology. In this work, a unique ruthenium(II) complex, [Ru(bpy)₂(DNBSO-bpy)](PF₆)₂ (bpy: 2,2′-bipyridine; DNBSO-bpy: 2,4-dinitrobenzenesulfonate of 4-(4-hydroxyphenyl)-2,2′-bipyridine), has been designed and synthesized as a highl ...
DOI:
10.1016/j.aca.2012.06.028

13. Random frog: An efficient reversible jump Markov Chain Monte Carlo-like approach for variable selection with applications to gene selection and disease classification

Author:
Li, Hong-Dong; Xu, Qing-Song; Liang, Yi-Zeng
Source:
Analytica chimica acta 2012 v.740 pp. 20-26
ISSN:
0003-2670
Subject:
Markov chain; algorithms; colon; data collection; disease diagnosis; frogs; gene expression; genes; microarray technology; models
Abstract:
... The identification of disease-relevant genes represents a challenge in microarray-based disease diagnosis where the sample size is often limited. Among established methods, reversible jump Markov Chain Monte Carlo (RJMCMC) methods have proven to be quite promising for variable selection. However, the design and application of an RJMCMC algorithm requires, for example, special criteria for prior di ...
DOI:
10.1016/j.aca.2012.06.031