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Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry

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https://www.readbyqxmd.com/read/28392534/determination-of-trace-elements-in-sintered-and-single-crystal-silicon-carbide-by-laser-ablation-in-liquid-inductively-coupled-plasma-mass-spectrometry
#1
Ryo Machida, Rina Nishioka, Masahide Fujiwara, Naoki Furuta
Laser ablation in liquid (LAL) sampling method transformed hard-to-digest materials to soluble particles, and thus allowed for smooth decomposition by acid digestion. LAL sampling is useful to generate nanoparticles from samples with less contamination. After acid digestion, trace elements in the LAL-sampled particles were analyzed by solution nebulization inductively coupled plasma mass spectrometry (ICPMS). For the first time we demonstrated that LAL-ICPMS can be used to determine trace elements in hard-to-digest samples; sintered SiC and single-crystal SiC...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392533/quantitative-and-single-step-enzyme-immunosensing-based-on-an-electrochemical-detection-coupled-with-lateral-flow-system
#2
Kohei Tominaga, Satoshi Arimoto, Ken Shimono, Toshihiko Yoshioka, Fumio Mizutani, Tomoyuki Yasukawa
A single-step electrochemical immunochromatography has been developed: the device was based on two pieces of nitrocellulose membrane, a sample pad with anti-mouse IgG antibody labeled with glucose oxidase (GOx-labeled antibody), a conjugate pad with glucose, and a Pt working electrode. Either antibody or antigen was immobilized on the membrane. The addition of a solution containing mouse IgG, a model target, allows for the dissolution of GOx-labeled antibody in the sample pad to form an immunocomplex. The produced immunocomplex was automatically separated by capturing to the antibody immobilized on the membrane with the sandwich structure or by passing through the membrane modified with an antigen for the competitive reaction...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392532/high-throughput-screening-of-erratic-cell-volume-regulation-using-a-hydrogel-based-single-cell-microwell-array
#3
Casey L Brown, Valerie Fleischauer, Jinseok Heo
Here, we report that a single-cell microwell array based on photocrosslinked hydrogel can be used to screen cells exhibiting a defective regulatory volume decrease (RVD) in high-throughput. The RVD is a regulatory function of cells that maintains cell volume homeostasis in a hypotonic medium. Single Madin-Darby canine kidney (MDCK) cells grown in the microwells were loaded with a volume-sensitive fluorescence dye. Changes in the volume of discrete single cells were traced for 20 min in a hypotonic solution using a wide-field fluorescence microscopy...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392531/validation-of-in-situ-measurements-of-atmospheric-nitrous-acid-using-incoherent-broadband-cavity-enhanced-absorption-spectroscopy
#4
Yoshihiro Nakashima, Yasuhiro Sadanaga
Incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) is a useful technique for measuring trace gaseous species in the atmosphere. Recently, IBBCEAS was used to measure concentrations of nitrous acid (HONO) in the troposphere to resolve controversies related to its formation and loss. Here, measurements of HONO and a mixture of HONO and NO2 using IBBCEAS were validated by comparing them with those obtained with a NOx analyzer. Good agreement was found between these methods, given their respective experimental uncertainties...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392530/a-highly-structured-1-10-phenanthroline-arrayed-hydrophobic-sulfone-membrane-platform-for-the-rapid-determination-and-speciation-of-fe-2-fe-3-ions-in-water
#5
Liyakat Hamid Mujawar, Muhammad Imtiaz Rashid, Zulfiqar Ahmad Rehan, Talal Almeelbi, Jalal Mohammad Basahi, Mohammad Soror El-Shahawi
An optical assay for the rapid determination and chemical speciation of Fe(2+)/Fe(3+) species has been proposed for the first time on a polyether sulfone (PES) membrane platform. The small pore size and low wettability (θ ∼82°) of the membrane disallowed the dissipation of analyte droplets on the surface, thus localizing it onto nanoliter arrayed 1,10-phenanthroline spots. Under optimized conditions and within ∼5 min, an acceptable limit of detection (0.1 μg mL(-1)) and linear dynamic range (1 - 100 μg mL(-1)) were achieved...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392529/development-of-a-high-density-microplasma-emission-source-for-a-micro-total-analysis-system
#6
Ken Kakegawa, Ryoto Harigane, Mari Aida, Hidekazu Miyahara, Shoji Maruo, Akitoshi Okino
To achieve a highly sensitive and onsite analysis of a small amount samples, a microplasma-based micro total analysis systems (μ-TAS) device was developed. A dielectric barrier discharge (DBD) that can generate a stable plasma at atmospheric pressure was generated in a microchip and used as the plasma source. The use of DBD suppresses the temperature rise of the electrodes and enables operation for long times because of a reduction of the electrode damage due to suppression of the current via dielectric interposing between the electrodes...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392528/colorimetric-microtiter-plate-assay-of-polycationic-aminoglycoside-antibiotics-in-culture-broth-using-amaranth
#7
Hajime Katano, Yasuhiro Kuroda, Shu Taira, Chitose Maruyama, Yoshimitsu Hamano
We present a colorimetric method for the detection of aminoglycoside antibiotics such as neomycin (NEO) using a reddish anionic dye, amaranth (AR(3-)). Under acidic conditions, at which NEO exists in fully protonated form (NEOH(6+)), the AR(3-) anion associates with the NEOH(6+) cation to form a precipitate, NEOH(AR)2. The precipitate was soluble in a buffer solution of pH 8.5, yielding a reddish solution with an absorption maximum at around 520 nm. Tobramycin and gentamycin, which exist as pentavalent cations under acidic conditions, gave almost the same results...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392527/interactions-of-three-chalcones-with-human-serum-albumin-revealed-by-spectroscopic-techniques
#8
Ji Ma, Yunchang Fan, Qingerile Si, Yuan Liu, Xiangfeng Wang, Hailing Liu, Mengxia Xie
Chalcones are the proverbial precursors of many naturally occurring compounds and possess a variety of biological activities and a broad spectrum of pharmacological properties. The interaction mechanism between three chalcones, 2',4',4-trihydroxyflavone (also called isoliquiritigenin, 2',4',4-triHC), 2',4'-dihydroxyflavone (2',4'-diHC), and 4-hydroxyflavone (4-HC) and human serum albumin (HSA) was investigated using fluorescence quenching, fluorescence enhancement and UV absorption spectra. The binding parameters of chalcone-HSA complexes were evaluated by fluorescence quenching measurements, and the results were consistent with those obtained from fluorescence enhancement methods...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392526/determination-of-trace-hydrazine-in-environmental-water-samples-by-in-situ-solid-phase-extraction
#9
Toshikuni Kato, Shogo Sugahara, Takahiro Kajitani, Yukiko Senga, Michiko Egawa, Hiroshi Kamiya, Yasushi Seike
A simple and rapid in situ method for the determination of hydrazine based on the concentration of aldazine compound formed by the reaction of hydrazine with p-dimethylaminobenzaldehyde was developed. This method was based on solid-phase extraction using a Sep-Pak C18 cartridge, followed by the quantification of hydrazine using a spectrophotometric method. To a sample solution of environmental water, p-dimethylaminobenzaldehyde solution was added to form aldazine by the reaction with hydrazine. The solution was passed through a Sep-Pak C18 cartridge for the adsorption of aldazine...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392525/effects-of-interfacial-properties-of-a-surface-modified-surface-plasmon-resonance-chip-on-protein-immobilization-performance
#10
Juan Wu, Yanbin Jiang, Lishi Wang, Qiang Zeng
In order to confirm the correlation between interfacial properties of modified surface plasmon resonance (SPR) chips and their SPR responses to immobilized anti-IgG, SPR chips were modified by mercaptoundecanoic acid, poly(ethylene glycol) diacrylate (PEG), PEG-based copolymer and cyclodextrin coupled PEG using self-assembled or radical polymerization methods. The resulting interfacial properties such as film thickness and hydrophilicity were characterized by AFM, elliptic polarization scanners and contact angle meter...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392524/direct-detection-of-aqueous-co2-by-infrared-waveguide-spectroscopy-with-an-amorphous-fluoropolymer-coating-rod
#11
Hiroki Hotta, Yuko Miki, Yukiko Kawaguchi, Kin-Ichi Tsunoda, Atsuko Nakaoka, Sho Ko, Takashi Kimoto
Infrared waveguide spectroscopy using a sapphire rod coated with an amorphous fluoropolymer (Cytop, Asahi Glass Co., ltd, Japan) has been developed in order to directly observe CO2 in aqueous solutions. Since the amorphous fluoropolymer has a relatively high gas-permeability and hydrophobic feature, the aqueous CO2 transmits into the amorphous fluoropolymer coating film, but water cannot penetrate into the film. Good linearity of calibration curves for CO2 in the gas and the aqueous solution were obtained.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392523/nanoporous-waveguide-spectroscopy-for-the-estimation-of-enzyme-adsorption-on-mesoporous-silica
#12
Hiroyuki Arafune, Kazuhiro Hotta, Tetsuji Itoh, Norio Teramae, Akira Yamaguchi
Mesoporous silica is considered as promising host material for enzymes due to its uniform pore size of enzyme dimensions and tunable surface chemical properties. In this study, we applied nanoporous waveguide (NPWG) spectroscopy to observe adsorption dynamics of heme proteins with different molecular size within mesoporous silica film modified with different surface functional groups. Since NPWG spectroscopy provides kinetic information and rough quantification of adsorption amount, it is useful to study the adsorption process of enzymes within inorganic nanoporous materials...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392522/in-situ-observation-of-direct-electron-transfer-reaction-of-cytochrome-c-immobilized-on-ito-electrode-modified-with-11-2-2-2-methoxyethoxy-ethoxy-ethoxy-undecylphosphonic-acid-self-assembled-monolayer-film-by-electrochemical-slab-optical-waveguide-spectroscopy
#13
Naoki Matsuda, Hirotaka Okabe, Ayako Omura, Miki Nakano, Koji Miyake
To immobilize cytochrome c (cyt.c) on an ITO electrode while keeping its direct electron transfer (DET) functionality, the ITO electrode surface was modified with 11-{2-[2-(2-methoxyethoxy)ethoxy]ethoxy}undecylphosphonic acid (CH3O (CH2CH2O)3C11H22PO(OH)2, M-EG3-UPA) self-assembled monolayer (SAM) film. After a 100-times washing process to exchange a phosphate buffer saline solution surrounding cyt.c and ITO electrode to a fresh one, an in situ observation of visible absorption spectral change with slab optical waveguide (SOWG) spectroscopy showed that 87...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392521/dynamic-analysis-of-adsorption-desorption-equilibrium-of-sublimed-aromatic-molecules-using-polarized-optical-waveguide-spectroscopy
#14
Hiromi Takahashi, Kyoko Fujita, Hiroyuki Ohno
The adsorption-desorption equilibrium of sublimed molecules has been analyzed dynamically by optical waveguide (OWG) spectroscopy. Dynamic change of the transition moment during adsorption behavior was successfully detected using polarized incident light. With this technique, sublimed planer aromatic molecules, such as azobenzene, were revealed to stack parallel to the solid surface at the initial stage followed by adsorption with relatively random orientation.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392520/in-situ-observation-of-desorption-reaction-of-cytochrome-c-from-solid-liquid-interfaces-with-slab-optical-waveguide-spectroscopy
#15
Shinya Taguchi, Hirofumi Kawazumi, Toshihiko Nagamura, Hirotaka Okabe, Naoki Matsuda
An automated solution exchange (SE) mechanism has been introduced to slab optical waveguide spectroscopy to estimate the protein immobilizing ability of a slab optical waveguide (SOWG) surface. In each SE process, SOWG spectral change in absorbance at peak position of cytochrome c (cyt.c) Soret band at 409 nm was observed to analyze the desorption ratio of cyt.c adsorbed on SOWG surface. Continuous SE processes for 100 times have successfully brought us a kind of master desorption curve of cyt.c, which was well fitted by a double exponential equation, indicating the existence of three kinds of adsorbed states, including weakly adsorbed, strongly adsorbed, and immobilized cyt...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392519/detection-of-lipomannan-in-cattle-infected-with-bovine-tuberculosis
#16
Dung M Vu, Rama M Sakamuri, W Ray Waters, Basil I Swanson, Harshini Mukundan
Early and rapid detection of bovine tuberculosis (bTB) is critical to controlling the spread of this disease in cattle and other animals. In this study, we demonstrate the development of an immunoassay for the direct detection of the bovine bTB biomarker, lipomannan (LM) in serum using a waveguide-based optical biosensor. We apply an ultra-sensitive detection strategy developed by our team, termed lipoprotein capture, that exploits the pull-down of high-density lipoprotein (HDL) nanodiscs from cattle blood that allows for the recovery and detection of associated LM...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392518/development-of-tetrahydrofuran-water-optical-waveguide-and-its-application-to-the-observation-of-extraction-behavior-of-1-anilino-8-naphtalene-sulfonate-at-the-tetrahydrofuran-water-interface
#17
Hiromi Takiguchi, Soto Asanuma, Junya Kamiyama, Hiroyasu Murata, Yuki Hasegawa, Satoshi Yoshizawa, Hiroki Hotta, Tamao Odake, Tomonari Umemura, Kiichi Sato, Kin-Ichi Tsunoda
A stable two-phase sheath flow using tetrahydrofuran (THF) for an inner flow and water for an outer flow was formed in a glass capillary, and worked as a stable liquid-core/liquid-cladding optical waveguide (THF/water LLW). Although THF and water were miscible with any ratio, the length of the stable THF/water LLW at 0.9 - 2.1 cm s(-1) reached at least 150 mm. The THF/water LLW was applied to the observation of extraction behavior of solvatochromic fluorescence dye, 1-anilino-8-naphtalene sulfonate (ANS), through the THF/water interface...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392517/ammonia-gas-detection-under-various-humidity-conditions-using-waveguide-surface-plasmon-resonance-spectroscopy
#18
Kazunari Shinbo, Ryo Komai, Hiroki Honda, Yasuo Ohdaira, Akira Baba, Keizo Kato, Futao Kaneko
Analysis of NH3 gas under various humidity conditions was conducted using a waveguide surface plasmon resonance (SPR) sensor with dual sensing parts. Two pairs of Ag films/sensing polymer films were prepared separately on a waveguide core of BK-7 slide glass. Poly(acrylic acid) (PAA) and poly(vinyl alcohol) (PVA) were used as sensing materials. A white light was guided through the core by illuminating the substrate edge, and the SPR property was investigated by observing the output light spectrum. The thicknesses of PAA and PVA films were adjusted to induce SPR at different wavelengths...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392516/electron-transfer-rate-in-potential-modulated-redox-reactions-with-electro-active-optical-waveguides
#19
Xue Han, Sergio B Mendes
A novel methodology has been developed to determine electron-transfer rate in electrically driven redox reactions. Based on a widely adopted electrical circuit describing faradaic processes in an electrochemical cell, the approach uses a combination of impedance data from optical and electrical measurements that are simultaneously acquired in a spectroelectrochemical experiment. Once the consistency of our methodology was experimentally corroborated, it was put to practice for investigating electron-transfer rate of cytochrome c adsorbates at very low concentrations on an indium tin oxide electrode by using a highly sensitive, single-mode, electro-active, integrated optical waveguide platform...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28392515/characterization-of-charge-transfer-kinetics-at-organic-electrode-interfaces-using-potential-modulated-attenuated-total-reflectance-pm-atr-spectroscopy
#20
Yilong Zheng, S Scott Saavedra
Potential-modulated attenuated total reflectance (PM-ATR) spectroscopy is a spectroelectrochemical method that utilizes the potential modulation approach and a waveguide ATR geometry. This unique combination enables measurements of electron-transfer (ET) kinetics of monolayer to submonolayer thin films on waveguide electrode surfaces. Selective probing of molecular subpopulations in a film can be achieved by choosing appropriate combinations of applied potential, wavelength, and polarization of light, which allows subpopulation structure to be correlated with ET kinetics...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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