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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/29434115/announcements
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2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434114/droplet-counting-microtitration-system-for-precise-on-site-analysis
#2
Susumu Kawakubo, Taichi Omori, Yasutada Suzuki, Ikuo Ueta
A new microtitration system based on the counting of titrant droplets has been developed for precise on-site analysis. The dropping rate was controlled by inserting a capillary tube as a flow resistance in a laboratory-made micropipette. The error of titration was 3% in a simulated titration with 20 droplets. The pre-addition of a titrant was proposed for precise titration within an error of 0.5%. The analytical performances were evaluated for chelate titration, redox titration and acid-base titration.
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434113/implementation-of-tube-radial-distribution-chromatography-by-using-a-commercially-available-hplc-system
#3
Hyo Kan, Kento Yamada, Nobuyuki Sanada, Koyo Nakata, Kazuhiko Tsukagoshi
Tube radial distribution chromatography based on tube radial distribution flow, or annular flow, in an open-tubular capillary has been reported. The chromatographic system requires specific instruments and treatments for microfluidic flow in the capillary tube. In this study, we have developed a new model of tube radial distribution chromatography, which is comprised of a commercially available HPLC system without any packed separation columns. Separation is performed in an open-tubular pipe (100-μm inner diameter and 350-cm length; temperature, 5°C) connected between the pump and the detector in the HPLC system...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434112/temperature-variable-nmr-study-of-the-keto-enol-tautomerism-of-phenylpyruvic-acid
#4
Toshiki Yamaji, Takeshi Saito
The keto-enol tautomerism of phenylpyruvic acid (PPA) has been studied by temperature-variable 9.4 T nuclear magnetic resonance (NMR) spectroscopy. It was found that PPA favored its existence in the enol form in dimethyl sulfoxide (DMSO) solvent, 93.5% of the enol and 6.5% of the keto tautomer was present in DMSO at room temperature. Increasing the temperature increased the percentage of the keto form. The experimental thermodynamic parameters for the tautomerism were successfully obtained from the spectral data...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434111/a-simple-and-robust-method-for-determination-of-alkylmercury-in-seawater-and-industrial-wastewater-by-phenylation-pretreatment-combined-with-gc-ms
#5
Kaori Shigeta, Hiroaki Tao, Katsuhiro Nakagawa, Tomoaki Kondo, Tetsuya Nakazato
For determination of methylmercury (MeHg) and ethylmercury (EtHg) in seawater and industrial wastewater, a simple and robust analytical method was developed based on phenylation and solvent extraction followed by GC-MS measurement. Alkylmercury compounds were directly phenylated with sodium tetraphenylborate in water and extracted into toluene. The method detection limits obtained for MeHg and EtHg in pure water were 53.3 and 33.5 ng Hg L-1, respectively, which are almost 10 times lower than the environmental quality standards for water pollution in Japan (EQSJ): 0...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434110/detection-and-quantification-of-4-methylimidazole-in-cola-by-matrix-assisted-laser-desorption-ionization-mass-spectrometry-with-fe2o3-nanoparticles-on-zeolite
#6
Yosuke Fujii, Yuqi Ding, Taichi Umezawa, Takafumi Akimoto, Jiawei Xu, Takashi Uchida, Tatsuya Fujino
Food additives generally used in carbonated drinks, such as 4-methylimidazole (4MI), caffeine (Caf?), citric acid (CA), and aspartame (Apm), were measured by matrix-assisted laser desorption ionization mass spectrometry (MALDI MS) using nanometer-sized particles of iron oxide (Fe2O3 NPs). The quantification of 4MI in Coca Cola (C-cola) was carried out. In order to improve the reproducibility of the peak intensities, Fe2O3 NPs loaded on ZSM5 zeolite were used as the matrix for quantification. By using 2-ethylimidazole (2EI) as the internal standard, the amount of 4MI in C-cola was determined to range from 88 to 65 μg/355 mL...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434109/moment-analysis-of-mass-transfer-kinetics-in-micellar-electrokinetic-chromatography-systems
#7
Kanji Miyabe, Nozomu Suzuki
Moment equations were developed for quantitatively studying the separation characteristics of micellar electrokinetic chromatography (MEKC). They explain how the first absolute and second central moments of elution peaks are correlated with some fundamental parameters of the partition equilibrium and mass transfer kinetics in MEKC systems. In order to discuss the influence of the mass transfer kinetics on peak broadening, the moment equations were used to analyze the separation behavior in MEKC systems. Separation conditions were chosen on the basis of practical MEKC experiments previously conducted...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434108/rapid-hplc-analytical-method-development-for-herbal-medicine-formulae-based-on-retention-rules-acquired-from-the-constituting-herbs
#8
Hua Yin, Li Zou, Yunjie Sheng, Xue Bai, Qiang Liu, Binjun Yan
Herbal medicine (HM) formulae are the combinations of two or more types of constituting herbs. This study has proposed a novel approach to efficiently develop HPLC methods for HM formulae, which take advantage of the mutual retention rules between HM formulae and their constituting herbs. An HM formula composed of two herbs, Radix Salviae Miltiorrhizae and Rhizoma Chuanxiong, was taken as a case study. Based on design of experiments and stepwise multiple linear regression, models relating the analytical parameters to the chromatographic parameters were built (correlation coefficients >0...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434107/determination-of-aqueous-formic-and-acetic-acids-by-purge-and-trap-analysis-with-a-needle-type-extraction-device-and-gas-chromatography-barrier-discharge-ionization-detector
#9
Ikuo Ueta, Yohei Nakamura, Susumu Kawakubo, Yoshihiro Saito
A purge-and-trap method using a needle-type extraction device and a gas chromatography-barrier discharge ionization detector for the analysis of formic (FA) and acetic acids (AA) in aqueous samples is presented. An activated carbon-based adsorbent, Carboxen 1000, was employed as the extraction medium for the needle-type extraction device. The sampling time was 5 min for collecting headspace gas in a glass vial, including 10 mL of an aqueous sample. The detection limits for FA and AA with a headspace sampling volume of 100 mL were 3...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434106/a-new-microfluidic-polymer-chip-with-an-embedded-cationic-surfactant-ion-selective-optode-as-a-detector-for-the-determination-of-cationic-surfactants
#10
Mekonnen Abiyot Ashagre, Takashi Masadome
A new microfluidic polymer chip with an embedded cationic surfactant (CS) ion-selective optode (CS-optode) as a detector of flow-injection analysis (FIA) for the determination of CSs was developed. The optode sensing membrane is based on a poly(vinyl chloride) membrane plasticized with 2-nitrophenyl octyl ether containing tetrabromophenolphthalein ethyl ester. Under the optimal flow conditions of the FIA system, the CS-optode showed a good linear relationship between the peak heights in the absorbance, and the concentrations of CS in a concentration range from 50 to 400 μmol dm-3...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434105/application-of-a-lithium-ion-selective-metallacrown-to-extraction-spectrophotometric-determination-of-lithium-in-saline-water
#11
Shoichi Katsuta, Yuki Saito, Suguru Takahashi
The solvent-extraction behavior of Li+ and Na+ with a Li+ selective metallacrown, [{Ru(η6-3,5-dimethylanisole)(2,3-pyridinediolate)}3], was investigated in the presence of organic dye anions, 3',3″,5',5″-tetrabromophenolphthalein ethyl ester ([TBPE]-), 2,6-dichloroindophenolate, and picrate ([pic]-). Each alkali metal ion was extracted as a 1:1:1 ternary complex of the metal ion, metallacrown, and anion. The Li+/Na+ extraction selectivity is anion dependent and highest with [pic]-. Therefore, we devised an extraction-spectrophotometric determination method for Li+ in saline water based on the extraction of Li+ using the metallacrown and [pic]- for high selectivity and subsequent replacement of [pic]- in the extracted species with [TBPE]- for high sensitivity...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434104/detection-of-paracetamol-in-water-and-urea-in-artificial-urine-with-gold-nanoparticle-al-foil-cost-efficient-sers-substrate
#12
Zhansaya Mukanova, Kristina Gudun, Zarina Elemessova, Laura Khamkhash, Ekaterina Ralchenko, Rostislav Bukasov
We demonstrated that a cost-efficient, easy to prepare, hybrid SERS substrate-gold nanoparticles (AuNPs) on untreated Al foil (AlF) can effectively detect pharmaceuticals, such as paracetamol and clinical biomarkers, like urea in artificial urine. The limit of detection (LOD) for paracetamol on AuNPs on AlF is superior (0.1 vs. 1 mM ) to the LOD reported for SERS detection of paracetamol in the literature. For SERS detection of urea in urine, AuNPs on both Al foil and Au film performed much better than AuNPs on glass, in terms of the concentration range, linearity and LOD...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434103/a-simple-and-highly-sensitive-quantitation-of-eicosanoids-in-biological-samples-using-nano-flow-liquid-chromatography-mass-spectrometry
#13
Ayumi Ando, Yoshinori Satomi
A simple sample preparation method for eicosanoid was developed by the combination of deproteinization and nanoLC-ESI-MS/MS. Eicosanoids are a group of bioactive lipid mediators, present in trace amounts in the body. Therefore, an analytical method for eicosanoids requires superior sensitivity. The method described in this report, which takes advantage of the highly sensitive power of nanoLC-ESI-MS/MS, enabled a simplification of the sample-preparation process. Eicosanoid extraction was performed just by homogenization in methanol with subsequent phospholipid removal, and then the liquid phase was directly subjected to nanoLC-ESI-MS/MS analysis without a condensation process...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434102/a-dual-acceptor-channel-membraneless-gas-diffusion-unit-for-simultaneous-determination-of-ethanol-and-acetaldehyde-in-liquors-using-reverse-flow-injection
#14
Nathawut Choengchan, Bangerdsuk Poontong, Arjnarong Mathaweesansurn, Noppadol Maneerat, Shoji Motomizu, Nuanlaor Ratanawimarnwong, Duangjai Nacapricha
A new design of membraneless gas-diffusion unit with dual acceptor channels for separation, collection and simultaneous determination of two volatile analytes in liquid sample is presented. The unit is comprised of three parallel channels in a closed module. A sample is aspirated into the central channel and two kinds of reagents are introduced into the other two channels. Two analytes are isolated from the sample matrix by diffusion into head-space and absorbed into the specific reagents. Non-absorbed vapor is released by opening the programmable controlled lid...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434101/microfluidic-analysis-with-front-face-fluorometric-detection-for-the-determination-of-total-inorganic-iodine-in-drinking-water
#15
Prawpan Inpota, Kamil Strzelak, Robert Koncki, Wisaroot Sripumkhai, Wutthinan Jeamsaksiri, Nuanlaor Ratanawimarnwong, Prapin Wilairat, Nathawut Choengchan, Rattikan Chantiwas, Duangjai Nacapricha
A microfluidic method with front-face fluorometric detection was developed for the determination of total inorganic iodine in drinking water. A polydimethylsiloxane (PDMS) microfluidic device was employed in conjunction with the Sandell-Kolthoff reaction, in which iodide catalyzed the redox reaction between Ce(IV) and As(III). Direct alignment of an optical fiber attached to a spectrofluorometer was used as a convenient detector for remote front-face fluorometric detection. Trace inorganic iodine (IO3- and I-) present naturally in drinking water was measured by on-line conversion of iodate to iodide for determination of total inorganic iodine...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434100/electrochemical-determination-of-chromium-vi-in-river-water-with-gold-nanoparticles-graphene-nanocomposites-modified-electrodes
#16
Trisna K Sari, Fumiki Takahashi, Jiye Jin, Rahmiana Zein, Edison Munaf
In this study, nanocomposites of ligand-free gold nanoparticles that are anchored onto the graphene surface (Graphene/AuNPs) were synthesized by a sonochemical method in a single reaction step. A highly sensitive amperometric sensor using Graphene/AuNPs is proposed for the determination of trace hexavalent chromium Cr(VI) in environmental water samples. Compared with a gold electrode, a glassy carbon electrode and a AuNPs modified glassy carbon electrode, the Graphene/AuNPs modified glassy carbon electrode exhibits the highest electrocatalytic activity and stability towards the reduction of Cr(VI), based on the results by cyclic voltammetry and electrochemical AC impedance studies...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434099/a-thioflavin-t-induced-g-quadruplex-fluorescent-biosensor-for-target-dna-detection
#17
Xiao Fang Zhang, Hong Mei Xu, Lei Han, Nian Bing Li, Hong Qun Luo
The detection of disease-related DNA is of great significance for early and accurate diagnosis and therapy. In this work, we successfully achieved the sensitive detection of target DNA based on a thioflavin T (ThT)-induced G-quadruplex fluorescent biosensor. ThT, a water-soluble fluorescent dye, can induce G-rich sequences to form G-quadruplexes and obtain an obviously enhanced fluorescence. In this work, it was employed to construct a biosensor for the detection of HIV. When the target HIV existed, the hairpin DNA probes would be opened in succession and release the completely exposed G-rich sequence to combine with ThT...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434098/promotion-effect-of-streptothricin-on-a-glucose-oxidase-enzymatic-reaction-and-its-application-to-a-colorimetric-assay
#18
Kohei Uematsu, Takaaki Ueno, Haruka Kawasaki, Chitose Maruyama, Yoshimitsu Hamano, Hajime Katano
Previously, we reported that ε-poly-L-lysine (25 - 35 residues) significantly promoted a glucose oxidase enzymatic (GOx) reaction using ferricyanide ion as the oxidant, and that the effect was due to the formation of a polyion complex between anionic GOx and protonated (polycationic) ε-poly-L-lysine. Here, we show that streptothricins (STs), which have an L-β-lysine oligomer (1 - 7 residues) and possess only several positive charges at most, also effectively promote the GOx enzymatic reaction. Interestingly, the promotion effect increased with the size of the lysine oligomer of STs, suggesting that the ionic valence is a key factor determining the degree of the promotion effect...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434097/three-dimensional-representation-method-using-pressure-time-and-number-of-theoretical-plates-to-analyze-separation-conditions-in-hplc-columns
#19
Masahito Ito, Katsutoshi Shimizu, Kiyoharu Nakatani
There has been considerable discussion of the speed performance of HPLC separation, especially regarding the relationship between theoretical plates and hold-up time. The fundamental discussion focuses on the optimal velocity, u0,opt, which gives a minimal height equivalent to a theoretical plate of the van Deemter plot. On the other hand, Desmet's method, using the kinetic performance limit (KPL), calculates the highest performance with a constant pressure drop, without focusing solely on the optimal velocity...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29434096/a-graphene-quantum-dots-enzyme-hybrid-system-for-the-fluorescence-assay-of-alkaline-phosphatase-activity-and-inhibitor-screening
#20
Hui Huang, Bingdi Wang, Meng Chen, Wenjing Zhang, Yongxin Li, Zhenning Liu
A graphene quantum dots (GQDs) and horse radish peroxidase (HRP) hybrid system was designed for the sensing of alkaline phosphatase (ALP) activity and inhibitor screening. We found that the photoluminescence (PL) intensity of GQDs could be quenched efficiently in the presence of phenol, H2O2 and HRP. Moreover, ALP could hydrolyze disodium phenyl phosphate (DPP) to produce phenol, and also could result in the photoluminescence quenching of GQDs. The decrease in the PL intensity was linear to the activity of ALP in the concentration range of 0...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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