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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/28496073/mass-transfer-in-mesoporous-microparticles-studied-by-confocal-fluorescence-recovery-after-photobleaching
#1
Tatsumi Sato, Katsuya Hata, Kiyoharu Nakatani
The intraparticle diffusion of a fluorescent dye in single microparticles in an aqueous solution was analyzed using fluorescence recovery after photobleaching, with a confocal fluorescence microscope. The fluorescence depth profile of single microparticles, and the fluorescence recovery at the particle center, were measured; further, the intraparticle diffusion coefficient was determined through simulations of three-dimensional diffusion in the respective microparticles. The intraparticle diffusion of coumarin 102 in octadecylsilyl silica gel was limited by the surface diffusion...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496072/improvement-of-chromium-vi-extraction-from-acidic-solutions-using-a-poly-vinyl-chloride-based-polymer-inclusion-membrane-with-aliquat-336-as-the-carrier
#2
Shigehiro Kagaya, Tomonori Maeno, Kazuma Ito, Makoto Gemmei-Ide, Robert W Cattrall, Spas D Kolev
An important reason for the inefficient extraction of Cr(VI) from its acidic solutions into polymer inclusion membranes (PIMs), consisting of poly(vinyl chloride) as the base-polymer and Aliquat 336 as the carrier, was found to be associated with the leaching of Aliquat 336 from the PIMs into the solutions, where it subsequently reduced the anionic Cr(VI) species to cationic Cr(III) species. The PIM extraction efficiency for Cr(VI) was significantly improved by the addition of NaNO3 to the solutions, which suppressed the leaching of Aliquat 336 and the reduction of Cr(VI) to Cr(III)...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496071/solubility-based-separation-and-purification-of-long-chain-chitin-oligosaccharides-with-an-organic-water-mixed-solvent
#3
Hajime Katano, Shota Noba, Kimihiko Sato, Hisashi Kimoto
A simple and rapid method for separation and purification of chitin oligosaccharides, (GlcNAc)n, with n ≥ 5 is presented. A commercially available chitin oligosaccharides sample, consisting of (GlcNAc)n with n = 1 - 7, was used as the starting material. Ten milligrams of the material was mixed with 100 μL of the 1 mol/L HCl. All the (GlcNAc)n species were dissolved in the aqueous medium. The aqueous solution was mixed with 900 μL of EtOH; the mixture was centrifuged, and the supernatant was removed to obtain a precipitate...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496070/trace-elemental-determination-using-a-portable-total-reflection-x-ray-fluorescence-spectrometer-with-a-collodion-film-sample-holder
#4
Shinsuke Kunimura, Tomoki Shinkai
Using a portable total-reflection X-ray fluorescence (TXRF) spectrometer with a collodion film sample holder, a spectrum of an analyte containing 50 ng of aluminum was measured. The Al Kα line (1.49 keV) that partially overlaps with the Si Kα line (1.74 keV) from a quartz glass substrate usually used as a sample holder for TXRF analysis, was clearly detected when using the collodion film sample holder. To investigate the quantitative performance of the portable spectrometer with a collodion film sample holder, the concentrations of Cr, Mn, and Fe in a certified reference material of river water (JSAC 0302-3b), whose certified values are 10...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496069/optimization-and-investigation-of-zwitterionic-monolithic-stationary-phases-for-capillary-ion-chromatography
#5
Nobuyuki Takayama, Lee Wah Lim, Toyohide Takeuchi
Zwitterionic monolithic columns were synthesized by a one-pot reaction using [2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide, ethylene dimethacrylate, methanol and 2,2'-azobis(isobutyronitrile) as the monomer, cross-linker, porogen and initiator, respectively. The optimum conditions for polymerization and the efficiency of the prepared columns were examined for ion chromatography. The separation of five kinds of inorganic anions was achieved. The back pressures were monitored as increasing flow-rate, and the resulting plate heights (i...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496068/the-use-of-a-gas-chromatography-milli-whistle-technique-for-the-on-line-monitoring-of-ethanol-production-using-microtube-array-membrane-immobilized-yeast-cells
#6
Ming-Ju Wu, Guan-Fu Ye, Ching-Hao Wang, Hong-Ting Victor Lin, Chien-Chung Chen, Cheng-Huang Lin
Hollow, poly(L-lactic acid) microtube array membranes (MTAM) were used in preparing membranes that contained immobilized yeast cells. To evaluate the performance of the developed system for continuous and fed-batch fermentation, a gas chromatography/milli-whistle device was used to on-line monitor the production of ethanol. The milli-whistle was connected to the outlet of a GC capillary, and when the fermentation gases and the GC carrier gas passed through it, a sound with a fundamental frequency was produced...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496067/retention-behavior-of-inorganic-anions-in-hydrophilic-interaction-chromatography
#7
Nobuyuki Takayama, Lee Wah Lim, Toyohide Takeuchi
The retention behavior of inorganic anions was studied in hydrophilic interaction chromatography (HILIC). In this study, five kinds of HILIC stationary phases (amino, imidazole, amide, pyridine and zwitterionic) were investigated. It was found that only amino and imidazole columns exhibited the separation of inorganic anions under HILIC conditions. The retention mechanism was further investigated under both columns. A reversed elution order of inorganic anions was observed under the HILIC condition compared with those observed under the ion-exchange chromatography mode (IEC)...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496066/application-of-deep-eutectic-solvents-in-hybrid-molecularly-imprinted-polymers-and-mesoporous-siliceous-material-for-solid-phase-extraction-of-levofloxacin-from-green-bean-extract
#8
Xiaoxia Li, Kyung Ho Row
Deep eutectic solvents (DES) are potential ecofriendly surfactants for the preparation of materials. In this study, both molecularly imprinted polymers (MIPs) and mesoporous siliceous materials (MSMs) were modified by betaine-based DES. Six materials were employed as solid phase extraction (SPE) adsorbents for the rapid purification of levofloxacin. The DES-based materials showed better selective adsorption than the conventional materials. The adsorption curves of DES-MIP showed superior molecular recognition ability and binding capability for levofloxacin compared to the other materials...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496065/solid-sampling-in-analysis-of-soils-by-two-jet-plasma-atomic-emission-spectrometry
#9
Natalia P Zaksas, Alexander F Veryaskin
The possibility of direct analysis of soils by two-jet plasma atomic emission spectrometry was investigated using certified reference materials of black earth, grey desert and red soils. It was shown that As, B, Cd, Cu, Hg, P, and V could be determined after a 2-fold, and Be, Co, Cr, Ga, Nb, Pb, and Zn-after a 10-fold dilution of the samples by a spectroscopic buffer using calibration samples based on graphite powder. The strongest matrix effects were revealed for red soil having the highest Al and Fe concentration, which led to the overstated concentrations of some elements...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496064/colorimetric-ion-sensors-based-on-polystyrenes-bearing-side-chain-triazole-and-donor-acceptor-chromophores
#10
Yongrong Li, Yusuke Washino, Tsuyoshi Hyakutake, Tsuyoshi Michinobu
Side chain clicked polystyrene derivatives formed by the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reaction showed colorimetric ion sensing behaviors when donor-acceptor chromophores, prepared by a [2+2] cylcoladdition-retroelectrocyclization between electron-rich alkynes and tetracyanoethylene (TCNE)/7,7,8,8-tetracyanoquinodimethane (TCNQ), were attached to the triazole rings. The metal ion sensing behaviors could be explained according to the theory of hard and soft acids and bases (HSAB). Hard acidic metal ions were mainly recognized by the hard basic anilino-nitrogen moieties, resulting in a decrease in the charge-transfer (CT) bands...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496063/fabrication-of-water-soluble-fluorescent-polymeric-micelles-for-selective-detection-of-hg-2-in-blood-serum
#11
Hong Wang, Jian Chen, Yongxiang Hong, Kun Lv, Maolin Yu, Peisheng Zhang, Yunfei Long, Pinggui Yi
In this study, amphiphilic diblock copolymers were designed and synthesized via the incorporation of reversible addition-fragmentation chain transfer radical polymerization (RAFT) and a subsequent grafting technique. Subsequently, Hg(2+)-sensitive water-soluble fluorescent polymeric micelles (FNs) were prepared by a reprecipitation strategy. The spectroscopic characteristics demonstrate that the fluorescein isothiocyanate (FITC) was successfully linked into the polymer. Due to the promoted reaction of desulfurization cyclization by Hg(2+), the fluorescence of fluorescein in FNs was obviously quenched...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496062/a-novel-electrochemical-sensor-based-on-ru-nh3-6-cl3-as-a-redox-indicator-for-the-detection-of-g-g-mismatched-dna
#12
Xiaoqian Zhu, Min Huang, Jiao Li, Hanping He, Xiuhua Zhang, Shengfu Wang
In this paper, a novel electrochemical sensor was developed for the rapid detection of G-G mismatched DNA based on hexaammineruthenium(III) chloride ([Ru(NH3)6]Cl3) as a redox indicator. The sensor platform was constructed by immobilizing small molecules (NC-linker) on the gold electrode via amide bonds. The as-prepared NC-linker as the nucleic acids recognition molecule can interact with the G base of DNA. After the sensor was incubated with G-G mismatched DNA, the double-stranded DNA (dsDNA) acted as carriers of the signal tags-[Ru(NH3)6]Cl3, which resulted in a remarkable electrochemical signal...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496061/application-of-electron-paramagnetic-resonance-and-solid-state-13-c-nuclear-magnetic-resonance-of-cross-polarization-magic-angle-spinning-to-study-enzymatic-degradation-of-silk-fabrics
#13
Yuan Zeng, Zhiqin Peng, Bing Wang, Zhiwen Hu, Junmin Wan, Yang Zhou
The enzymatic degradation of silk by protease XIV has been investigated by using scanning electron microscopy (SEM), Fourier transfer infrared spectroscopy (FTIR), solid-state (13)C nuclear magnetic resonance of cross-polarization/magic angle spinning ((13)C CP/MAS solid state NMR) and electron paramagnetic resonance (EPR). Micro-morphology of protease XIV aged samples showed that microfilaments were stripped out from the surface of silk fibers. The results of FTIR and (13)C CP/MAS solid-state NMR indicated that the enzymatic degradation process could be divided into two stages...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496060/rapid-detection-of-small-molecule-metabolites-in-serum-of-hepatocellular-carcinoma-patients-using-ultrafast-liquid-chromatography-ion-trap-time-of-flight-tandem-mass-spectrometry
#14
Hui Li, Su-Fang Fan, Yan Wang, Shi-Gang Shen, Dian-Xing Sun
A method was developed for analyzing broad spectrum small molecule metabolites in the serum of hepatocellular carcinoma (HCC) patients based on ultrafast liquid chromatography-ion trap-time of flight tandem mass spectrometry (UFLC-IT-TOF MS). Serum samples were collected from 80 HCC patients and healthy persons. After pretreatment process for protein precipitation, the supernatant was analyzed with the UFLC-IT-TOF MS to obtain information on the metabonomics of small molecules. The eight compounds of glycocholic acid, choline glycerophosphate, acetyl-L-phenylalanine, oleamide, tetradecanamide, acetylcarnitine, lysolecithin and glycochenodeoxycholic acid in the HCC group were identified with significant differences from those in the health group (P <0...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496059/rapid-photoluminescence-quenching-based-detection-of-cu-2-in-aqueous-medium-by-cds-quantum-dots-surface-passivated-by-thiourea
#15
Ambika Kumar, R K Dutta
Presented here is a simple yet rapid and efficient analytical method for visual as well as spectroscopic method for sensing of trace concentrations of Cu(2+) ions in aqueous medium by systematic photoluminescence quenching of a highly water soluble probe made of CdS quantum dots surface modified by thiourea. The salient features of this work describe rapid detection (2 min equilibration time) of Cu(2+) ions at wider linear concentration range (0.025 - 10 mg/L) corresponding to a sensitivity of 2.81(mg/L)(-1) and limit of quantification of 47...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496058/derivatization-based-high-throughput-bioanalysis-by-lc-ms
#16
Toshimasa Toyo'oka
Liquid chromatography coupled with mass spectrometry (LC-MS) is one of the most prominent analytical techniques due to its inherent selectivity and sensitivity. LC-MS is currently the first choice for high-throughput bioanalysis due to the advancements in MS instruments and the analytical software. Based on this situation, we are developing various types of derivatization reagents, including chiral reagents for MS and/or MS/MS detection. These developed reagents are adopted for the detection of biomarker candidates related to diseases...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28496057/optical-elemental-analysis-of-metals-using-shewanella-oneidensis
#17
Kengo Ishiki, Hiroshi Shiigi, Tsutomu Nagaoka
A simple method for the detection of metal ions in solution is proposed, using Shewanella oneidensis, which has the ability to reduce metal ions into metal nanoparticles on the cell surface. The method can be used to identify metal ions in solution using the light-scattering characteristics of the metal nanoparticles formed on the cells.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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
#18
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
#19
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
#20
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
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