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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/28302987/development-of-a-certified-reference-material-nmij-crm-7203-a-for-elemental-analysis-of-tap-water
#1
Yanbei Zhu, Tomohiro Narukawa, Kazumi Inagaki, Shin-Ichi Miyashita, Takayoshi Kuroiwa, Tomoko Ariga, Izumi Kudo, Masae Koguchi, Sung Woo Heo, Jung Ki Suh, Kyoung-Seok Lee, Yong-Hyeon Yim, Youngran Lim
A certified reference material (CRM), NMIJ CRM 7203-a, was developed for the elemental analysis of tap water. At least two independent analytical methods were applied to characterize the certified value of each element. The elements certified in the present CRM were as follows: Al, As, B, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Mo, Na, Ni, Pb, Rb, Sb, Se, Sr, and Zn. The certified value for each element was given as the (property value ± expanded uncertainty), with a coverage factor of 2 for the expanded uncertainty...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302986/sers-measurement-of-cysteamine-molecules-stretched-by-the-electromagnetophoretic-force
#2
Shin Wakiyama, Hitoshi Watarai
The role of an external force on chemical equilibria is an important subject in mechanobiochemistry. The effect of an electromagnetophoretic force for the stretching of cysteamine molecules was examined by using SERS spectrometry. Polystyrene particles modified with cysteamine were bound to silver nanoparticles adsorbed on the wall of a silica capillary cell. Under a constant magnetic field, when an electric current was applied to the conductive medium in the capillary, the shift of SERS bands and the increase of the trans/gauche ratio of cysteamine were observed, suggesting a molecular conformation change of cysteamine due to the stretching force...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302985/application-of-laser-ionization-time-of-flight-mass-spectrometry-for-the-direct-measurement-of-a-silane-coupling-agent-in-slurries
#3
Takaaki Fujii, Tomohiro Uchimura
Laser ionization time-of-flight mass spectrometry (LI-TOFMS) was applied to the direct measurement of a silane coupling agent in slurries. In the present study, a slurry with dispersed TiO2 nanoparticles treated with phenyltriethoxysilane (PTES) was prepared. As a result, the peaks for PTES could be observed from the slurry sample containing unreacted PTES, and no peaks were observed from the slurry sample where unreacted PTES was removed by washing. This method can be used to directly analyze surface coating agents, such as PTES in slurries, and would be useful for obtaining a direct understanding of the characteristics of slurries...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302984/development-of-a-multichannel-dialysis-microchip-for-bioassay-of-drug-efficacy-and-retention
#4
Yu Sakuta, Kin-Ichi Tsunoda, Kiichi Sato
Here, we developed a multichannel dialysis microchip having three sets of dialysis systems, which consisted of three independent circulation channels with a common micropump. Each dialysis system was composed of a pneumatic micropump (heart), dialysis unit (renal corpuscle), and cell culture chamber (drug target) as well as circulation and dialysate channels to mimic the circulation system. Small molecules were successfully separated in parallel from macromolecules at the dialysis components. Anticancer tests using this microchip showed results that considered both serum protein-binding nature and drug activity...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302983/determination-of-lead-in-water-samples-by-gfaas-after-collection-on-montmorillonite-with-slurry-introduction
#5
Ece Caliskan, Hande Tinas, Nil Ozbek, Suleyman Akman
In this study, a highly accurate, fast and practical separation/enrichment technique is described to determine the Pb in tap water samples by graphite furnace atomic absorption spectrometry. For this purpose, at first, Pb was collected on montmorillonite by batch technique, the supernatant was decanted and the solid phase was slurried in a mixture of 0.1% Triton X-114 and 0.1 mol L(-1) HNO3 then directly introduced into graphite furnace without elution. Since the elution step was not applied, the method was simpler and faster compared to conventional techniques...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302982/selective-and-sensitive-detection-of-silver-i-ion-based-on-tetracationic-complex-and-tga-gsh-co-capped-quantum-dots-as-an-effective-fluorescent-sensing-platform
#6
Xue-Wen Liu, Jun-Shi Shu, Yang Xiao, Yang Yang, Song-Bai Zhang
CdTe quantum dots capped with glutathione (GSH) and thioglycolic acid (TGA) were synthesized and the interaction between QDs and tetracationic Fe complex was investigated. Based on the specific interaction between Ag(+) and cytosine bases (C), we designed a label-free DNA sensor for the detection of Ag(+) in aqueous solution. Furthermore, tetracationic Fe complex with a higher positive charge is demonstrated to improve the sensitivity of the sensor. A detection limit of 3.3 nmol dm(-3) was obtained, which was lower than in previous reports...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302981/studies-on-isotope-ratio-measurement-of-cl-by-inductively-coupled-plasma-triple-quad-mass-spectrometry
#7
Masaki Ohata, Yanbei Zhu, Naoko Nonose
Fundamental studies on isotope ratio measurement of Cl were carried out using inductively coupled plasma triple-quad mass spectrometry (ICP-MS/MS) and the analytical performance obtained was compared to that obtained by ICP sector field mass spectrometer (ICP-SFMS). Though the polyatomic ion interferences of (16)O(18)O(1)H and (36)Ar(1)H with respect to (35)Cl and (37)Cl, respectively, made a negative effect on the accuracy and the precision for isotope ratio measurements of Cl, the ICP-SFMS could eliminate these interferences by medium mass resolution mode (m/Δm = 4000) and achieved the isotope ratio measurements with 0...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302980/concentration-measurement-of-amino-acid-in-aqueous-solution-by-quantitative-1-h-nmr-spectroscopy-with-internal-standard-method
#8
Taichi Yamazaki, Sakae Eyama, Akiko Takatsu
We describe a procedure to determine concentrations of amino acid standard solutions by quantitative NMR spectroscopy using an internal standard. The measurement samples were prepared by solvent exchange to remove any intense solvent signal in the (1)H NMR spectra. The method was demonstrated on valine aqueous solutions of different concentrations. The accuracy of the measured concentrations that fell well within the range of the expanded uncertainty is also discussed. All of the results are in good agreement with the preparation values...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302979/development-of-a-method-for-measuring-phytanic-acid-as-a-lifestyle-related-disease-biomarker-in-rat-serum-using-ultra-fast-liquid-chromatography-ultraviolet-spectrophotometry-combined-with-a-modified-2-nitrophenylhydrazine-derivatization-method
#9
Aoi Miyamoto, Takahiko Aoyama, Masahiro Okamura, Noboru Fukuda, Takahiro Ueno, Masanori Abe, Yoshiaki Matsumoto
A simple and rapid ultra-fast liquid chromatography-ultraviolet spectrophotometry (UFLC-UV) method combined with modified 2-nitrophenylhydrazine (2-NPH) derivatization was developed for determining phytanic acid (Phy) in rat serum. Serum Phy and heptadecanoic acid (the internal standard) were derivatized by 2-NPH at ambient temperature for 20 min and extracted in n-hexane. After extracting derivatized Phy (D-Phy) and derivatized IS from the reaction mixture, the extracts were separated with a YMC-Pack C8 column (150 × 3...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302978/determination-of-ultra-trace-metal-impurities-in-high-purity-cadmium-using-inductively-coupled-plasma-mass-spectrometry-after-matrix-separation-with-anion-exchange-resin
#10
Ayaka Wada, Naoko Nonose, Masaki Ohata, Tsutomu Miura
The analytical method for ultra-trace metal impurities at μg kg(-1) level in high-purity Cd was examined by inductively coupled plasma mass spectrometry (ICP-MS) combined with matrix separation by Bio-Rad AG MP-1M anion exchange resin. After the separation of Cd, the metal impurities such as Li, In, Cr, Mn, Fe, Co, Ni, Cu, Ga, Sr, Ba and Pb were measured by an ICP-quadrupole mass spectrometer (ICP-QMS) and ICP-sector field mass spectrometer (ICP-SFMS). From the comparison of measured results, it was evaluated that the analytical sensitivity by ICP-SFMS was 10 times higher than ICP-QMS...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302977/real-time-in-situ-simultaneous-monitoring-of-dissolved-oxygen-and-materials-movements-at-a-vicinity-of-micrometers-from-an-aquatic-plant-by-combining-deflection-of-a-probe-beam-and-fluorescence-quenching
#11
Xing-Zheng Wu, Xiaoyan Wu, Tomomi Inoue
It is desirable to be able to monitor the intake or release of the components at different organs of aquatic plants in real time and in-situ. Here, we report a novel optical detection system that allows for real-time in-situ simultaneous monitoring of the dissolved oxygen and material movements at a vicinity of micrometers from the aquatic plant surface. A blue semiconductor diode-laser was used as the light source of both the probe beam and excitation light for fluorescence. The laser light reflected by a dichroic mirror was focused to a vicinity of the plant/water interface in a culture dish by an objective lens...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302976/fundamental-study-on-ablation-sampling-of-fe-based-binary-alloys-in-laser-induced-breakdown-optical-emission-spectrometry
#12
Xinyue Zhang, Shunsuke Kashiwakura, Kazuaki Wagatsuma
This paper describes the fundamental process of laser ablation occurring in a laser-induced plasma. The sampling process in laser-induced breakdown plasma spectrometry is very complicated and thus has not been fully understood. Our study focused on a relationship between the composition of ablation amounts and the bulk composition, when Fe-based binary alloys were employed as test samples. For this purpose, the ablation amounts of constituent elements in the alloys were determined by ICP-OES, through a method in which ablated deposits by laser irradiation were collected on a glass plate and then dissolved in an acid solution...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302975/chromatographic-separation-of-cd-from-plants-via-anion-exchange-resin-for-an-isotope-determination-by-multiple-collector-icp-ms
#13
Rongfei Wei, Qingjun Guo, Hanjie Wen, Marc Peters, Junxing Yang, Liyan Tian, Xiaokun Han
In this study, key factors affecting the chromatographic separation of Cd from plants, such as the resin column, digestion and purification procedures, were experimentally investigated. A technique for separating Cd from plant samples based on single ion-exchange chromatography has been developed, which is suitable for the high-precision analysis of Cd isotopes by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The robustness of the technique was assessed by replicate analyses of Cd standard solutions and plant samples...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302974/effect-of-the-chain-length-of-a-modified-layer-and-surface-roughness-of-an-electrode-on-impedimetric-immunosensors
#14
Chia-Hung Lin, Ming-Jie Lin, Ching-Chou Wu
An ultrasensitive label-free impedimetric immunosensor is constructed by modifying a 3-mercaptoproponic acid (MPA) monolayer on highly rough gold nanostructure (AuNS)-electrodeposited screen printed carbon electrodes (SPCEs) for the detection of small molecular weight drugs (SMWDs), such as salbutamol (SAL). The SPCEs preoxidized in a 0.1 M H2SO4 solution (called po-SPCEH2SO4) are electrodeposited with the AuNS to increase the roughness factor to 23.64 ± 1.76, larger than the AuNS/po-SPCENaOH or the AuNS/po-SPCEPBS...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302973/a-highly-sensitive-colorimetric-method-for-copper-ions-detection-based-on-controlling-the-peroxidase-like-activity-of-au-pt-nanocatalysts
#15
Yuan-Feng Wang, Na Pan, Chi-Fang Peng
In this study, a sensitive colorimetric method for the detection of copper ion (Cu(2+)) was developed based on controlling the peroxidase-like activity of (gold core)@(ultrathin platinum shell) nanocatalysts (Au@Pt-NCs). It was found that D-penicillamine can effectively inhibit the activity of Au@Pt-NCs. After being incubated with Cu(2+), D-penicillamine lost inhibition toward the catalytic ability of Au@Pt-NCs. Based on the above interaction, a colorimetric detection of Cu(2+) was develop by measuring the colorimetric signal variation of the H2O2-3,3',5,5'-tetramethylbenzidine (TMB) reaction...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302972/sequential-injection-chromatography-with-an-ultra-short-monolithic-column-for-the-low-pressure-separation-of-%C3%AE-tocopherol-and-%C3%AE-oryzanol-in-vegetable-oils-and-nutrition-supplements
#16
Sujitra Thaithet, Supaporn Kradtap Hartwell, Somchai Lapanantnoppakhun
A low-pressure separation procedure of α-tocopherol and γ-oryzanol was developed based on a sequential injection chromatography (SIC) system coupled with an ultra-short (5 mm) C-18 monolithic column, as a lower cost and more compact alternative to the HPLC system. A green sample preparation, dilution with a small amount of hexane followed by liquid-liquid extraction with 80% ethanol, was proposed. Very good separation resolution (Rs = 3.26), a satisfactory separation time (10 min) and a total run time including column equilibration (16 min) were achieved...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302971/electrochemical-control-of-bioluminescence-by-blocking-the-adsorption-of-the-bacterial-luciferase-using-a-mercaptobipyridine-self-assembled-monolayer
#17
Shinya Yamasaki, Shuto Yamada, Hiroyuki Takemura, Kô Takehara
An N-butyl-N'-(4-mercaptobutyl)-4,4'-bipyridinium (4BMBP) was modified on a gold electrode to improve the electrochemical control of the bacterial luciferase (BL) luminescence system. The 4BMBP-modified gold electrode (4BMBP/Au) was able to prevent the adsorption of BL on the electrode surface, and enhanced the electrochemical regeneration rate of the reduced flavin mononucleotide (FMNH2), which is one of the substrates of the BL luminescence reaction. By using the 4BMBP/Au, the luminescence intensity increased by about 27% compared to that of a bare gold electrode (bare Au)...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302970/modified-radical-scavenging-and-antioxidant-activity-measurement-of-%C3%AE-carotene-with-%C3%AE-cyclodextrins-complexation-in-aqueous-medium
#18
Saliha Esin Çelik, Burcu Bekdeser, Ayse Nur Tufan, Resat Apak
In order to evaluate the antioxidant capacity/activity of β-carotene (BC) in aqueous media, we investigated the inclusion complexes of BC with methyl-β-cyclodextrin (Me-β-CD), 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) and 2-hydroxyethyl-β-cyclodextrin (HE-β-CD) that enhance water solubility and chemical stability. The inclusion complexes (monitored by FTIR) exhibited higher solubility than free BC, and phase solubility studies showed a linear increase in the solubility with the Me-β-CD concentration...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302969/fast-and-simple-determination-of-3-aminopiperidine-without-derivatization-using-high-performance-liquid-chromatography-charged-aerosol-detector-with-an-ion-exchange-reversed-phase-mixed-mode-column
#19
Shubo Dong, Zhengyu Yan, Hanyue Yang, Zhen Long
A sensitive non-derivatization method for the determination of the highly polar compound 3-aminopiperidine was developed using a mixed-mode column combined with a charged aerosol detector (CAD). Chromatographic conditions, including the type of detector, separation mode, and mobile phase composition, were optimized to achieve high sensitivity towards and sufficient retention of 3-aminopiperidine. Compared to the precolumn derivatization UV method, the current method showed higher recovery and greater simplicify...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28302968/electrodes-modified-with-composite-layers-based-on-poly-3-4-ethylenedioxythiophene-as-sensors-for-paracetamol
#20
Karolina Sipa, Ewelina Socha, Slawomira Skrzypek, Pawel Krzyczmonik
Two sensors for paracetamol were obtained on the basis of a GC electrode modified with poly(3,4-ethylenedioxythiophene) (PEDOT). The first sensor was a GC electrode modified with a conductive composite layer of PEDOT doped with poly(4-lithium styrenesulfonic acid) (PSSLi), and the second one was a GC electrode modified by a composite of PEDOT doped with PSSLi and multiwall carbon nanotubes (MWCNT). A conductive PEDOT polymer film was used as an electron mediator with a rich electron cloud. Both sensors were developed for the determination of paracetamol (ACOP) in the presence of interference compounds...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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