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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/29681565/measurement-of-electron-transfer-within-a-single-supramolecular-assembly-containing-a-biological-molecule
#1
Takafumi Kozakai, Takanori Harashima, Manabu Kiguchi, Tomoaki Nishino
No abstract text is available yet for this article.
April 20, 2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29563356/binding-constant-of-the-cell-shaped-cavity-formed-on-a-polymer-for-escherichia-coli-o157
#2
Xueling Shan, Takuya Yamauchi, Hiroshi Shiigi, Tsutomu Nagaoka
No abstract text is available yet for this article.
March 20, 2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29563355/ultrasonic-mist-generation-assist-nitrogen-argon-gas-mix-effect-on-radioactive-strontium-quantification-by-online-solid-phase-extraction-with-inductively-coupled-plasma-mass-spectrometry
#3
Makoto Furukawa, Makoto Matsueda, Yoshitaka Takagai
No abstract text is available yet for this article.
March 20, 2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643316/determination-of-blood-plasma-aminothiols-using-derivatization-enhanced-capillary-transient-isotachophoresis
#4
Alexander V Ivanov, Ksenya A Nikiforova, Polina O Bulgakova, Edward D Virus, Aslan A Kubatiev
A sensitive capillary electrophoresis method was developed for the determination of aminothiol (cysteine, homocysteine, and glutathione) total levels in human blood plasma. Analytes were derivatized with Ellman's reagent (5,5'-dithiobis(2-nitrobenzoic acid)) after reduction with dithiothreitol. Liquid-liquid extraction was applied to purify the samples and concentrate the analytes. Total analysis time was 7.5 min using a silica capillary (50 μm i.d.; effective separation length 23.5 cm). Electrophoretic separation was performed using 50 mM citric acid with 20 mM triethanolamine (pH 3) containing 2% Ficoll 400...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643315/a-dual-alkylated-peptide-ligand-enhances-affinity-to-human-serum-albumin
#5
Elnaz Nakhaei, Ko Takehara, Hikari Sato, Khadijah Zai, Akihiro Kishimura, Takeshi Mori, Yoshiki Katayama
Therapeutic peptides and diagnostic agents with their molecular size below the renal clearance threshold suffer from short blood circulation time. Here, we report a novel design of peptide-based ligand with a strong binding affinity to human serum albumin (HSA), which can be used as a tag to extend the blood circulation of small-size molecules. We designed ligands with dual alkyl groups connected with a negatively charged spacer. The ligands showed both higher binding affinity to HSA and a higher retention in mice blood than that of a single alkylated peptide...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643314/ultra-sensitive-trace-water-optical-sensor-with-in-situ-synthesized-metal-organic-framework-in-glass-paper
#6
Shin-Ichi Ohira, Nao Nakamura, Masaaki Endo, Yusuke Miki, Yasuo Hirose, Kei Toda
Monitoring of trace water in industrial gases is strongly recommended because contaminants cause serious problems during use, especially in the semiconductor industry. An ultra-sensitive trace-water sensor was developed with an in situ-synthesized metal-organic framework as the sensing material. The sample gas is passed through the sensing membrane and efficiently and rapidly collected by the sensing material in the newly designed gas collection/detection cell. The sensing membrane, glass paper impregnated with copper 1,3,5-benzenetricarboxylate (Cu-BTC), is also newly developed...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643313/development-of-an-analytical-system-based-on-a-magneto-pneumatic-oxygen-analyzer-for-atmospheric-oxygen-determination
#7
Nobuyuki Aoki, Takuya Shimosaka
A high-precision analytical system to observe the variations in the amount fractions of atmospheric oxygen with a very small uncertainty was developed. The system comprises a magneto-pneumatic oxygen analyzer and three automatic pressure controllers. The drift of the analyzer's signal intensity can be reduced when the amount fractions of oxygen in the sample and reference gases are similar because the temperature coefficient of the analyzer linearly depends on the difference between these amount fractions. The repeatability of oxygen determination and the long-term stability of the system were tested to assess the applicability of the analyzer to field-based measurements for continuous atmospheric observations...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643312/determination-of-dissolved-silica-in-seawater-by-ion-exclusion-chromatography-with-post-column-derivatization-silicomolybdenum-yellow-detection
#8
Chikako Cheong, Yoshiyasu Yamauchi, Tsutomu Miura
The determination of dissolved silica in seawater was investigated by an ion-exclusion chromatography with a post-column derivatization/silicomolybdenum yellow method. To determine dissolved silica in seawater accurately, the experimental conditions, such as the volume of a reaction coil, the eluent concentration and the sample dilution factor, were optimized. This is the first report that has examined the details of the experimental condition for the measurement of dissolved silica in seawater by ion-exclusion chromatography with silicomolybdenum-yellow detection...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643311/changes-in-the-structural-features-of-organic-matter-extracted-from-compost-by-the-seawater-during-a-90-day-period-under-anaerobic-conditions-and-its-effect-on-oogenesis-of-brown-macroalga
#9
Hisanori Iwai, Yuya Takasaki, Masami Fukushima
Seawater-extractable organic matter (SWEOM) has a potential to serve as an Fe complexing agent in an Fe-fertilizer intended to restore and preserve macroalgal forests. To better understand the restoration technique, structural alterations in SWEOM that occurred during a 90-day period of incubation in seawater were determined. Up to 82% of the total eluted SWEOM occurred during the initial 30 days; a small amount of SWEOM then continued to elute during the next 60 days. Spectroscopic analyses showed that the high-molecular-weight SWEOM fraction (HMW) altered in aliphatic-rich materials, while the low-molecular-weight fraction (LMW) became significantly enriched in aromatic structures...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643310/nanomolar-determination-of-hydrogen-peroxide-in-coastal-seawater-based-on-the-fenton-reaction-with-terephthalate
#10
Kazuhiko Takeda, Hitoshi Nojima, Kengo Kuwahara, Russel Chrispine Chidya, Adeniyi Olufemi Adesina, Hiroshi Sakugawa
A non-enzymatic fluorescence method for the determination of hydrogen peroxide (H2 O2 ) was investigated. This method is based on the hydroxylation reaction of terephthalate (TP) by hydroxyl radical formed from reaction between H2 O2 and Fe(II), resulting in the formation of a strongly fluorescent 2-hydroxyterephthalate (HTP). Under optimized conditions, a 3 nM detection limit and 1.0% precision at 200 nM were obtained. This was sensitive enough to determine the concentrations of H2 O2 in coastal marine environments...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643309/a-colorimetric-and-fluorescent-probe-for-the-detection-of-cu-2-in-a-complete-aqueous-solution
#11
Jing Xu, Zuokai Wang, Caiyun Liu, Zhenghe Xu, Baocun Zhu, Ning Wang, Kun Wang, Jiangting Wang
The fluorescent probe has become an important method for the detection of heavy metal ions. In the present work, a new and simple fluorescent probe, Cu-P, for detecting copper ion (Cu2+ ) was designed and synthesized. The probe has shown high sensitivity and selectivity toward Cu2+ . The detection limit was 13 nM (based on the 3σ/slope). A significant color change from yellow to pink was observed; thus, the probe Cu-P could serve as a "naked-eye" indicator for Cu2+ . Furthermore, the proposed probe was used to detect Cu2+ in real water and soil extract samples, with the result being satisfactory...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643308/porous-organic-cage-embedded-c18-amide-silica-stationary-phase-for-high-performance-liquid-chromatography
#12
Xuemeng Zhang, Hengye Li, Lin Zhang, Fenying Kong, Dahe Fan, Wei Wang
Reduced imine cage (RCC3) was first adopted for the preparation of porous organic cage embedded C18 amide silica stationary phase for high performance liquid chromatography. The prepared stationary phase was characterized by scanning electron microscope (SEM) and Fourier transformation infrared spectrum (FT-IR). Its chromatographic performance under reversed-phase mode was investigated in detail and compared with that of an ODS column. Multiple interactions, including hydrophobic interaction, π-π interactions, electrostatic interactions and hydrogen bonding, were involved due to the synergism of the C18 chain and RCC3...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643307/quantification-of-trans-resveratrol-in-red-wines-using-quechers-extraction-combined-with-liquid-chromatography-tandem-mass-spectrometry
#13
Shih-Chieh Lu, Wan-Rou Liao, Sung-Fang Chen
Resveratrol is one of representative ingredient in red wine, but its quantification is a challenge because of a complex and abundant matrix. In this study, two sample pretreatments, direct dilution and QuEChERS extraction, coupling LCMS analysis were examined for resveratrol quantification. Similar recoveries of 106.4 to 93.7% were obtained for direct dilution and QuEChERS, respectively. With the aid of condition optimization, QuEChERS extraction could concentrate the resveratrol from red wines to improve the detection sensitivity with a LOD value of 2...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643306/hyperbranched-polyglycerol-functionalized-silica-stationary-phase-for-hydrophilic-interaction-liquid-chromatography
#14
Hengye Li, Xuemeng Zhang, Lin Zhang, Hui Cang, Fenying Kong, Dahe Fan, Wei Wang
Surface-initiated anionic-ring-opening multibranching polymerization was employed to prepare a hyperbranched polyglycerol (HPG) functionalized silica stationary phase for hydrophilic interaction liquid chromatography (HILIC). The obtained stationary phase was characterized by Fourier-transform infrared spectrometry (FT-IR) and thermogravimetric analysis (TGA). The chromatographic properties of the prepared stationary phase were systematically investigated. The abundance and multitude distribution of hydroxyl groups in HPG endowed the stationary phase with improved hydrophilicity and enhanced separation performance compared with the stationary phase functionalized with monolayer of hydroxyl groups...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643305/an-ascorbic-acid-oxidase-based-sensing-platform-for-stereoselective-interaction-with-ascorbic-acid-and-isoascorbic-acid
#15
Jiao Ma, Juanjuan Xu, Chengcheng Yang, Jinyi Song, Yingzi Fu
A simple enzyme-based nanohybrid material was fabricated via immobilizing ascorbic acid oxidase (AO) on the surface of flower-like electrodeposited gold nanoparticles (dpAu) and reduced graphene oxide (rGO) modified glassy carbon electrodes (GCEs). The composite material was used for stereoselective interaction with ascorbic acid (AA) and isoascorbic acid (IAA). Herein, AO was applied as a stereoselective selector, and the dpAu/rGO nanohybrid not only acted as a supporter for high loading of AO, but also served as the nanomaterial for signal amplification...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643304/determination-of-anthracene-in-water-samples-by-elisa-using-ahr-binding
#16
Yanfeng Lv, Xiaoxiang Zhao, Lian Yang, Xian Zhang, Yujie Bai
The degradation of polycyclic aromatic hydrocarbons (PAHs) can generate AhR-binding compounds, exhibiting genotoxicity and carcinogenicity. In this investigation, aryl hydrocarbon receptor (AhR) from carp and anthracene (Ant) were coupled as antigen to establish an indirect competition ELISA (ic-ELISA) with an AhR-Ant antibody. A standard curve was determined for the ic-ELISA concerning detection range and limit. Also, the specificity, stability and the recovery of the ic-ELISA were checked. Results indicate that the ratio of antibody to antigen titer is 1:64000...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643303/fast-detection-of-bismerthiazol-in-cabbage-based-on-fluorescence-quenching-of-protein-capping-gold-nanoclusters
#17
Yuliang Cheng, Yao Zhang, Renjun Pei, Yunfei Xie, Weirong Yao, Yahui Guo, He Qian
In this work, bismerthiazol was firstly assayed by a fast and portable method employing protein-capping gold nanoculsters as probes. The luminescent intensity of the nanoclusters showed a correlative response towards bismerthiazol from 5 to 4000 μg/mL with a linear relation in the range of 5 - 100 μg/mL. As little as 5 μg/mL of bismerthiazol could be quantified. The high affinity of bismerthiazol to interact with the soybean protein-capped gold nanoclusters contributed to the excellent selectivity of this method over other common pesticides...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643302/rapid-determination-of-two-triterpenoid-acids-in-chaenomelis-fructus-using-supercritical-fluid-extraction-on-line-coupled-with-supercritical-fluid-chromatography
#18
Xiaotian Zhang, Feng Ji, Yueqi Li, Tian He, Ya Han, Daidong Wang, Zongtao Lin, Shizhong Chen
In this study, an on-line supercritical fluid extraction (SFE) and supercritical fluid chromatography (SFC) method was developed for the rapid determination of oleanoic acid and ursolic acid in Chaenomelis Fructus. After optimization of the conditions, the two triterpenoid acids was obtained by SFE using 20% methanol as a modifier at 35°C in 8 min. They were resolved on a Shim-pack UC-X Diol column (4.6 × 150 mm, 3 μm) in 14 min (0 - 10 min, 5 - 10%; 10 - 14 min, 10% methanol in CO2 ) with a backpressure of 15 MPa at 40°C...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643301/current-mass-spectrometric-tools-for-the-bioanalyses-of-therapeutic-monoclonal-antibodies-and-antibody-drug-conjugates
#19
Kenichiro Todoroki, Tomohiro Yamada, Hajime Mizuno, Toshimasa Toyo'oka
The increase in the use of therapeutic monoclonal antibodies (mAbs) and antibody-drug conjugates (ADCs) has made the detailed bioanalysis of these drugs essential not only for planning optimal therapeutic programs for clinical practice, but also for evaluating the biological equivalencies in the development of other biosimilars. The ligand binding assays that are widely in use now are being replaced rapidly by the highly accurate, sensitive, and selective analytical method using a mass spectrometer. This review will discuss the progress in and challenges observed during the development of a mass spectrometry-based bioanalytical method for therapeutic mAbs and ADCs...
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29643300/copper-ion-sensing
#20
Ryo Kato
No abstract text is available yet for this article.
2018: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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