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Mikrochimica Acta

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https://www.readbyqxmd.com/read/29386691/selective-adsorption-and-determination-of-hexavalent-chromium-ions-using-graphene-oxide-modified-with-amino-silanes
#1
Paulina Janik, Beata Zawisza, Ewa Talik, Rafal Sitko
Novel adsorbents are described for the preconcentration of chromium(VI). Graphene oxide (GO) was modified with various amino silanes containing one, two, or three nitrogen atoms in the molecule. These include 3-aminopropyltriethoxysilane (APTES), N-(3-trimethoxysilylpropyl)ethylenediamine (TMSPEDA), and N1-(3-trimethoxysilylpropyl)diethylenetriamine (TMSPDETA). The resulting GO derivatives were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray fluorescence spectrometry (EDXRF)...
2018: Mikrochimica Acta
https://www.readbyqxmd.com/read/29398725/lateral-flow-test-for-visual-detection-of-silver-i-based-on-cytosine-ag-i-cytosine-interaction-in-c-rich-oligonucleotides
#2
Zebin Guo, Yafeng Zheng, Hui Xu, Baodong Zheng, Wanwei Qiu, Zebin Guo
The authors describe an oligonucleotide-based lateral flow test for visual detection of Ag(I). The assay is based on cytosine-Ag(I)-cytosine [C-Ag(I)-C] coordination chemistry to capture gold nanoparticle (AuNP) tags in the test zone. A thiolated C-rich oligonucleotide probe was immobilized on the AuNPs via gold-thiol chemistry, and a biotinylated C-rich oligonucleotide probe was immobilized on the test zone. The AuNPs labelled with C-rich oligonucleotides are captured by Ag(I) ions in the test zone through the C-Ag(I)-C coordination...
November 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/29200502/lateral-flow-assay-for-carbohydrate-antigen-19-9-in-whole-blood-by-using-magnetized-carbon-nanotubes
#3
Yan Huang, Yongqiang Wen, Kwaku Baryeh, Sunitha Takalkar, Michelle Lund, Xueji Zhang, Guodong Liu
The authors describe a rapid, low-cost and sensitive approach for the determination of carbohydrate antigen 19-9 (CA 19-9) in whole blood by using magnetized carbon nanotube (MCNT) and lateral flow strip biosensor (LFSB). MCNTs were synthesized by depositing magnetite (Fe3O4) nanoparticles on multiwalled carbon nanotube (CNT) via co-precipitation of ferric and ferrous ions within a dispersion of shortened multiwalled CNTs. Antibody against CA 19-9 (Ab1) was covalently immobilized on the MCNTs and were used to capture CA 19-9 in blood...
November 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/29109592/nanomaterial-based-biosensors-for-detection-of-prostate-specific-antigen
#4
Dominika Damborska, Tomas Bertok, Erika Dosekova, Alena Holazova, Lenka Lorencova, Peter Kasak, Jan Tkac
Screening serum for the presence of prostate specific antigen (PSA) belongs to the most common approach for the detection of prostate cancer. This review (with 156 refs.) addresses recent developments in PSA detection based on the use of various kinds of nanomaterials. It starts with an introduction into the field, the significance of testing for PSA, and on current limitations. A first main section treats electrochemical biosensors for PSA, with subsections on methods based on the use of gold electrodes, graphene or graphene-oxide, carbon nanotubes, hybrid nanoparticles, and other types of nanoparticles...
July 14, 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/29187761/gold-nanocage-based-lateral-flow-immunoassay-for-immunoglobulin-g
#5
Yunhui Yang, Mehmet Ozsoz, Guodong Liu
The authors describe a gold nanocage-based lateral flow strip biosensor (LFSB) for low-cost and sensitive detection of IgG. This protein was used as a model analyte to demonstrate the proof-of-concept. The method combines the unique optical properties of gold nanocages (GNCs) with highly efficient chromatographic separation. A sandwich-type of immunoreactions occurs on the GNC-based LFSB which has the attractive features of avoiding multiple incubation, separation, and washing steps. The captured GNCs on the purple test zone and control zone of the biosensor are producing characteristic purple bands, and this enables IgG even to be visually detected...
July 2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28979051/enzyme-based-amperometric-galactose-biosensors-a-review
#6
REVIEW
Prosper Kanyong, Francis D Krampa, Yaw Aniweh, Gordon A Awandare
This review (with 35 references) summarizes the various strategies used in biosensors for galactose, and their analytical performance. A brief comparison of the enzyme immobilization methods employed and the analytical performance characteristics of a range of galactose biosensors are first summarized in tabular form and then described in detail. Selected examples have been included to demonstrate the various applications of these biosensors to real samples. Following an introduction into the field that covers the significance of sensing galactose in various fields, the review covers biosensors based on the use of galactose oxidase, with a discussion of methods for their immobilization (via cross-linking, adsorption, covalent bonding and entrapment)...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28845057/a-water-stable-lanthanide-metal-organic-framework-for-fluorimetric-detection-of-ferric-ions-and-tryptophan
#7
Hani Nasser Abdelhamid, Antonio Bermejo-Gómez, Belén Martín-Matute, Xiaodong Zou
The preparation of a highly water stable and porous lanthanide metal-organic framework (MOF) nanoparticles (denoted SUMOF-7II; SU refers to Stockholm University) is described. SUMOF-7II was synthesized starting from the tritopic linker of 2,4,6-tri-p-carboxyphenyl pyridine (H3L2) and La(III) as metal clusters. SUMOF-7II forms a stable dispersion and displays high fluorescence emission with small variation over the pH range of 6 to 12. Its fluorescence is selectively quenched by Fe(III) ions compared to other metal ions...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28572689/a-field-deployable-method-for-a-rapid-screening-analysis-of-inorganic-arsenic-in-seaweed
#8
Edi Bralatei, Karolina Nekrosiute, Jenny Ronan, Andrea Raab, Evin McGovern, Dagmar B Stengel, Eva M Krupp, Joerg Feldmann
Inorganic arsenic (iAs) in 13 store-bought edible seaweed samples and 34 dried kelp (Laminaria digitata) samples was determined by a newly developed, field-deployable method (FDM) with the aid of a field test kit for arsenic in water. Results from the FDM were compared to results from speciation analysis achieved by using high performance liquid chromatography coupled to inductively coupled plasma mass spectrometry (HPLC-ICP-MS). The FDM consisted of a simple extraction method using diluted HNO3 to quantitatively extract iAs without decomposing the organoarsenicals to iAs followed by the selective volatilisation of iAs as arsine (AsH3) and subsequent chemo-trapping on a filter paper soaked in mercury bromide (HgBr2) solution...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/28344361/the-interaction-of-fluorescent-nanodiamond-probes-with-cellular-media
#9
Simon R Hemelaar, Andreas Nagl, François Bigot, Melissa M Rodríguez-García, Marcel P de Vries, Mayeul Chipaux, Romana Schirhagl
Fluorescent nanodiamonds (FNDs) are promising tools to image cells, bioanalytes and physical quantities such as temperature, pressure, and electric or magnetic fields with nanometer resolution. To exploit their potential for intracellular applications, the FNDs have to be brought into contact with cell culture media. The interactions between the medium and the diamonds crucially influence sensitivity as well as the ability to enter cells. The authors demonstrate that certain proteins and salts spontaneously adhere to the FNDs and may cause aggregation...
2017: Mikrochimica Acta
https://www.readbyqxmd.com/read/27046940/optofluidic-devices-with-integrated-solid-state-nanopores
#10
Shuo Liu, Aaron R Hawkins, Holger Schmidt
This review (with 90 refs.) covers the state of the art in optofluidic devices with integrated solid-state nanopores for use in detection and sensing. Following an introduction into principles of optofluidics and solid-state nanopore technology, we discuss features of solid-state nanopore based assays using optofluidics. This includes the incorporation of solid-state nanopores into optofluidic platforms based on liquid-core anti-resonant reflecting optical waveguides (ARROWs), methods for their fabrication, aspects of single particle detection and particle manipulation...
April 2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27217593/%C3%AE-hemolysin-nanopore-studies-reveal-strong-interactions-between-biogenic-polyamines-and-dna-hairpins
#11
Yun Ding, Aaron M Fleming, Cynthia J Burrows
The α-hemolysin (α-HL) nanopore analyzes DNA as it is electrophoretically driven through the pore. The respective current vs. time (i-t) traces depends on the DNA sequence, its secondary structures, or on the physical conditions of the analysis. The current study describes analysis of a DNA hairpin with a 5'-extension with the α-HL nanopore in the presence of the polyamines spermine (Spm), spermidine (Spd), and putrescine (Put). These studies identified a new i-t trace characteristic of the DNA-polyamine complex...
March 2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27057067/quantum-dot-modified-paper-based-assay-for-glucose-screening
#12
Gema M Durán, Tomás E Benavidez, Ángel Ríos, Carlos D García
A simple and inexpensive method to fabricate a colloidal CdSe/ZnS quantum dots-modified paper-based assay for glucose is herein reported. The circular paper sheets were uniformly loaded and displayed strong fluorescence under a conventional hand-held UV lamp (365 nm). The assay is based on the use of glucose oxidase enzyme (GOx), which impregnated the paper sheets, producing H2O2 upon the reaction with the glucose contained in the samples. After 20 min of exposure, the fluorescence intensity changed due to the quenching caused by H2O2...
February 1, 2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27795582/plasmonic-detection-and-visualization-of-directed-adsorption-of-charged-single-nanoparticles-to-patterned-surfaces
#13
Vitali Scherbahn, Shavkat Nizamov, Vladimir M Mirsky
It has recently been shown that surface plasmon microscopy (SPM) allows single nanoparticles (NPs) on sensor surfaces to be detected and analyzed. The authors have applied this technique to study the adsorption of single metallic and plastic NPs. Binding of gold NPs (40, 60 and 100 nm in size) and of 100 nm polystyrene NPs to gold surfaces modified by differently ω-functionalized alkyl thiols was studied first. Self-assembled monolayers (SAM) with varying terminal functions including amino, carboxy, oligo(ethylene glycol), methyl, or trimethylammonium groups were deposited on gold films to form surfaces possessing different charge and hydrophobicity...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27546906/ionic-liquid-assisted-electrochemical-exfoliation-of-carbon-dots-of-different-size-for-fluorescent-imaging-of-bacteria-by-tuning-the-water-fraction-in-electrolyte
#14
Xuehua Li, Zhiwei Zhao, Chen Pan
An electrochemical approach is introduced for synthesis of carbon dots (CDs) by exfoliating graphite rods at a voltage of 15 V in an electrolyte consisting of a mixture of water and two ionic liquids. It is found that the size of the CDs can be tuned by varying the fraction of water in the mixed electrolyte; CDs in sizes of 4.9, 4.1 and 3.1 nm are obtained if the electrolyte contains water in fractions of 24, 38 and 56 %, respectively. The CDs have a quantum yield of almost 10 % and display the typical excitation wavelength-dependent maxima of photoluminescence, strongest at excitation/emission wavelengths of 360/440 nm...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27217592/manganese-dioxide-modified-carbon-paste-electrode-for-voltammetric-determination-of-riboflavin
#15
Eda Mehmeti, Dalibor M Stanković, Sudkate Chaiyo, Ľubomir Švorc, Kurt Kalcher
A carbon paste electrode bulk was modified with MnO2 and investigated for use as an electrochemical sensor for riboflavin (vitamin B2) using differential pulse voltammetry (DPV). Riboflavin displays a well expressed oxidation peak at -0.15 V (versus Ag/AgCl) in solutions with a pH value of 2. Effects of pH value, pulse amplitude and pulse time were optimized by employing DPV. The signals obtained are linearly related to the concentrations of riboflavin in the range from 0.02 to 9 μM. Other features include a 15 nM detection limit, and good reproducibility (±3 %) and repeatability (±2 %)...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27013767/nanopore-based-analysis-of-biochemical-species
#16
Nannan Liu, Zekun Yang, Xiaowen Ou, Benmei Wei, Juntao Zhang, Yongmei Jia, Fan Xia
Biological nanochannels or nanopores play a crucial role in basic biochemical processes in cells. Artificial nanopores possessing dimensions comparable to the size of biological molecules and mimicking the function of biological ion channels are of particular interest with respect to the design of biosensors with a sensitivity that can go down to the fM level and even to single molecule detection. Nanopore-based analysis (NPA) is currently a new research field with fascinating prospects. This review (with 118 refs...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/26766877/preconcentration-of-fe-iii-co-ii-ni-ii-cu-ii-zn-ii-and-pb-ii-with-ethylenediamine-modified-graphene-oxide
#17
Beata Zawisza, Anna Baranik, Ewa Malicka, Ewa Talik, Rafał Sitko
We describe a novel solid phase sorbent that was synthesized by coupling graphene oxide (GO) to ethylenediamine (EDA). This nanomaterial (referred to as GO-EDA) is capable of adsorbing the ions of iron, cobalt, nickel, copper, zinc and lead. The ethylenediamine-modified graphene oxide was characterized by X-ray photoelectron spectroscopy, scanning electron microscopy and Fourier transform infrared spectroscopy. The analytical procedure relies on (a) sorption of metal ions on GO-EDA dispersed in aqueous samples; (b) filtering, and (c) direct submission of the filter paper to energy-dispersive X-ray fluorescence spectrometry...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/26766876/direct-speciation-analysis-of-thallium-based-on-solid-phase-extraction-and-specific-retention-of%C3%A2-a-tl-iii-complex-on-alumina-coated-with-sodium-dodecyl-sulfate
#18
Ewa Biaduń, Monika Sadowska, Natalia Ospina-Alvarez, Beata Krasnodębska-Ostręga
Alumina (Al2O3) with an average particle size of 63 μm was modified with the anionic surfactant sodium dodecyl sulfate (SDS) and then applied to (i) solid phase extraction and separation of both thallium(I) and thallium(III), and (ii) preconcentration of Tl(III) from waste water samples. Only Tl(III), in the form of its complex with diethylenetriaminepentaacetate (DTPA), was retained on the sorbent, from where it can be eluted with 40 % nitric acid. Thallium species were then quantified by ICP MS. The method was characterized by a LOD of 25 pg of Tl(I) and 160 pg of Tl(III) in 10 mL samples...
2016: Mikrochimica Acta
https://www.readbyqxmd.com/read/27134313/interference-of-atp-with-the-fluorescent-probes-yoyo-1-andyoyo-3-modifies-the-mechanical-properties-of-intercalator-stained-dna-confined-in-nanochannels
#19
Maedeh Roushan, Zubair Azad, Shuang Fang Lim, Hong Wang, Robert Riehn
Intercalating fluorescent probes are widely used to visualize DNA in studies on DNA-protein interactions. Some require the presence of adenosine triphosphate (ATP). We have investigated the mechanical properties of DNA stained with the fluorescent intercalating dyes YOYO-1 and YOYO-3 as a function of ATP concentrations (up to 2 mM) by stretching single molecules in nanofluidic channels with a channel cross-section as small as roughly 100×100 nm(2). The presence of ATP reduces the length of the DNA by up to 11 %...
June 1, 2015: Mikrochimica Acta
https://www.readbyqxmd.com/read/26500376/extraction-and-pre-concentration-of-platinum-and-palladium-from-microwave-digested-road-dust-via-ion-exchanging-mesoporous-silica-microparticles-prior-to-their-quantification-by-quadrupole-icp-ms
#20
Winfried Nischkauer, Marie-Alexandra Neouze, Frank Vanhaecke, Andreas Limbeck
We report on the use of mesoporous silica microparticles (μPs) functionalized with quarternary amino groups for the isolation of platinum and palladium tetrachloro complexes from aqueous road dust digests. The μPs have a size ranging from 450 to 850 nm and are suspended directly in the aqueous digests, upon which the anionic Pt and Pd complexes are retained on the cationic surface. Subsequently, the μPs are separated by centrifugation. Elements that cause spectral interferences in ICP-MS determination of Pt and Pd can be quantitatively removed by adding fresh 0...
2015: Mikrochimica Acta
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