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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/28190849/luminol-chemiluminescence-profile-of-o-w-emulsions-during-thermal-oxidation
#1
Mitsuhiro Wada, Akiko Yamaguchi, Akihiro Ogawa, Hirotsugu Kido, Shinichi Nakamura, Makoto Takada, Shigeru Kawakami, Naotaka Kuroda, Kenichiro Nakashima
The luminol chemiluminescence (CL) profile of an oil-in-water (O/W) emulsion during thermal oxidation (60°C) was assessed using the luminol-K3[Fe(CN)6] assay, in which the oxidation species produced by the autoxidation of an O/W emulsion generated CL emission. Increased CL intensity was observed for O/W emulsions prepared using either linseed or corn oil, which was increased by the addition of Fe(2+) to the O/W emulsion. The relationship between the CL profile and results obtained by conventional approaches, such as the peroxide value (PV) and thiobarbituric acid (TBA) methods, were compared...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190848/determination-of-sunset-yellow-based-on-its-quenching-effect-on-the-fluorescence-of-acridine-orange
#2
Hui Zhang, Xing Zhao, Shaopu Liu, Jidong Yang, Ruilin Duan, Yusheng Yuan, Xiaoli Hu
Acridine orange (AO) is widely applied as an organic fluorescent probe. In this work, AO was reacted with sunset yellow (SY) to form an ion-association complex in pH 3.4 Britton-Robinson (BR) buffer solution medium. This resulted in the fluorescence quenching of the former and helped to detect the latter with the maximum excitation wavelengths (λex) and emission wavelengths (λem) near 490 and 530 nm, respectively. The assay exhibits high sensitivity and selectivity with a detection limit of 0.002 μmol L(-1) and the remarkable quenching of fluorescence was proportional to the concentration of SY in the range of 0...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190847/high-performance-alkyl-diamide-amine-and-water-soluble-diamide-ligand-for-separating-of-am-iii-from-cm-iii
#3
Hideya Suzuki, Yasuhiro Tsubata, Tatsuro Matsumura
Alkyl diamide amine (ADAAM), a new high-performance reagent with a simple structure, was examined for the mutual separation of Am(III) and Cm(III). The combination of ADAAM and N,N,N',N'-tetraethyldiglycolamide (TEDGA) as a masking agent shows selectivity for Am(III) over Cm(III) in highly acidic media with separation factors of up to 41.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190846/an-analytical-method-for-determining-residual-lactide-in-polylactide-by-gas-chromatography
#4
Xinchao Bian, Zhiming Chen, Lidong Feng, Bin Sun, Sheng Xiang, Yanlong Liu, Gao Li, Xuesi Chen
An analytical method to determine the residual lactide in polylactide (PLA) was proposed using an internal standard method of gas chromatography (GC). PLA samples and diphenyl ether (DPE) as an internal standard were dissolved in dichloromethane, then PLA was precipitated in anhydrous alcohol. The residual lactide and DPE were extracted to alcohol for GC analysis. At room temperature, lactide could react with alcohol and change into ethyl lactoyl lactate (ELL), but the relative response factor of lactide versus DPE could be obtained through a numerical analysis method...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190845/investigation-of-1-dodecylimidazolium-modified-filter-papers-as-a-thin-film-microextraction-phase-for-the-preconcentration-of-bisphenol-a-from-plant-oil-samples
#5
Cunling Ye, Chang Liu, Shen Wang, Zhike Wang
Based on the tunability of ionic liquids (ILs) according to the specific requirement of an application, 1-dodecylimidazolium chloride with amphiphilic structures was chemically fabricated on the surface of filter papers (DIL-FPs) for the first time. After synthesis, DIL-FPs was characterized by scanning electronic microscopy, energy dispersive X-ray spectroscopy and Fourier-transform infrared spectroscopy. DIL-FPs was used as a novel thin-film microextraction (TFME) phase for the preconcentration of amphiphilic bisphenol A from plant oil samples...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190844/sensitive-and-simple-detection-of-glucose-based-on-single-plasmonic-nanorod
#6
Gang Xu, Yuhua Zhu, Jie Pang
A simple and sensitive method to determinate glucose content was developed based on single plasmonic nanoparticles by conventional dark-field microscopy (DFM). An enzyme-responsive plasmonic Ag/Au bilayer of rods was designed and prepared. Their localized surface plasmon resonance (LSPR) could be tailored by the enzyme reaction of glucose oxidase (GOx) by finely tuning the morphology and plasmonic optical response of the hybrid nanostructure. It was found that the plasmon resonance scattering (PRS) spectra peak (λmax) shifted to longer wavelengths under enzyme reactions, and the degree of the shift were proportional to the content of glucose...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190843/application-of-internal-standard-method-for-several-3d-transition-metallic-elements-in-flame-atomic-absorption-spectrometry-using-a-multi-wavelength-high-resolution-spectrometer
#7
Yusuke Toya, Toshiko Itagaki, Kazuaki Wagatsuma
We investigated a simultaneous internal standard method in flame atomic absorption spectrometry (FAAS), in order to better the analytical precision of 3d-transition metals contained in steel materials. For this purpose, a new spectrometer system for FAAS, comprising a bright xenon lamp as the primary radiation source and a high-resolution Echelle monochromator, was employed to measure several absorption lines at a wavelength width of ca. 0.3 nm at the same time, which enables the absorbances of an analytical line and also an internal standard line to be estimated...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190842/simultaneous-direct-determinations-of-na-mg-k-ca-p-and-s-in-biodiesel-fuel-by-icp-qms-qms-after-xylene-dilution-development-and-application-of-a-high-throughput-method-for-a-homogeneity-assessment-of-a-candidate-reference-material
#8
Yanbei Zhu, Yuko Kitamaki, Masahiko Numata
Inductively coupled plasma tandem quadrupole mass spectrometry (ICP-QMS/QMS) measurements after xylene dilution were investigated as a method for determining the elements (Na, Mg, K, Ca, P, and S) in a biodiesel fuel (BDF) candidate reference material (RM). Optimizations were respectively carried out for the following parameters to obtain the best performance for measurements: O2 flow rate (additional gas to the carrier gas) to ensure complete combustion of the xylene solvent in the plasma, plasma power to obtain lower background signal intensities for Na and K, O2 flow rate (reaction cell gas) to remove any spectral interference with the S, H2 flow rate so as to remove spectral interference with Ca...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190841/hairpin-shaped-dna-templated-copper-nanoparticles-for-fluorescence-detection-of-adenosine-triphosphate-based-on-ligation-mediated-exonuclease-cleavage
#9
Wenping Zhu, Liyan Dai, Zengchen Liu, Weijie Yang, Chunxiang Zhao, Yanxia Li, Yahong Chen
DNA-templated copper nanoparticles (CuNPs) have recently received considerable interest as functional fluorescent probes for biochemical analysis. In this work, a novel ATP-dependent ligation reactions (ATP-DLR) based ATP assay strategy was proposed by using hairpin-shaped (HS) DNA templated CuNPs as a fluorescent probe. Nick sealing by T4 DNA ligase leads to the formation of intact HS DNA, which can resist the exonuclease cleavage and be taken as the template for CuNPs formation, resulting in strong fluorescence...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190840/preparation-of-a-surface-functionalized-power-free-pdms-microchip-for-microrna-detection-utilizing-electron-beam-induced-graft-polymerization
#10
Ryo Ishihara, Yoshitaka Uchino, Kazuo Hosokawa, Mizuo Maeda, Akihiko Kikuchi
We propose an easy microchannel surface functionalization method for a poly(dimethylsiloxane) (PDMS) microchip that utilizes electron beam-induced graft polymerization (EIGP) as a platform for microchip-based biomarker analysis. Unlike other grafting techniques, EIGP enables rapid surface modification of PDMS without initiator immobilization. The grafted microchip is preservable, and can be easily functionalized for versatile applications. In this study, the surface-functionalized power-free microchip (SF-PF microchip) was used for the detection of microRNA (miRNA), which is a biomarker for many serious diseases...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190839/label-free-water-soluble-fluorescent-peptide-probe-for-a-sensitive-and-selective-determination-of-copper-ions
#11
Tao Yang, Fang Zhu, Tianxiao Zhou, Jianzhong Cao, Yibo Xie, Meiyi Zhang, Yan Wang, Dong-Sheng Cao, Qinlu Lin, Lin Zhang
This study aimed to develop a label-free, sensitive, selective, and environment-friendly fluorescent peptide probe His-His-Trp-His (HHWH) for determining the concentration of copper ion (Cu(2+)) in aqueous solutions. The results demonstrated that the designed HHWH has a high selectivity and sensitivity for monitoring the concentration of free Cu(2+) via quenching of the probe fluorescence upon a binding of Cu(2+). The fluorescence intensity of the HHWH had a linear relationship with the concentration of Cu(2+) between 10 nM and 10 μM, and the detection limit was 8 nM...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190838/determination-of-aluminum-in-edible-jellyfish-using-chrome-azurol-s-with-spot-test-on-filter-paper
#12
Dai Cheng, Xinyu Zhang, Xiang Li, Lihua Hou, Chunling Wang
Aluminum (Al) has been well known as an environmental factor that may affect several enzymes and other biomolecules related to Alzheimer's disease. The increasing use of Al in the preparation and storage of food currently represents the main form of Al exposure for the general public. The present study was aimed to develop a household procedure for the rapid test determination of Al in edible jellyfish. The method was developed based on the reaction of Chrome Azurol S with Al in acidic medium, forming a colored compound on the surface of filter paper...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190837/analysis-of-distribution-and-intraparticle-diffusion-of-a-fluorescent-dye-in-mesoporous-silica-gel-by-confocal-fluorescence-microspectroscopy
#13
Tatsumi Sato, Kiyoharu Nakatani
A micrometer-sized spherical silica gel microparticle (pore diameter, ∼7 nm) was injected into an aqueous rhodamine 6G solution using microcapillary manipulation-injection technique, and the dye distribution in the single microparticle was measured as the fluorescence depth profile by confocal fluorescence microspectroscopy. The fluorescence depth profile was simulated by the convolution and deconvolution methods to correct the contribution of the spatial resolution of the experimental system. The dye homogeneously or heterogeneously distributed in the microparticle at the adsorption equilibrium, dependent on the type of silica gel...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190836/specificity-of-microrna-detection-on-a-power-free-microfluidic-chip-with-laminar-flow-assisted-dendritic-amplification
#14
Kazuki Hasegawa, Rina Negishi, Mutsuyoshi Matsumoto, Masafumi Yohda, Kazuo Hosokawa, Mizuo Maeda
MicroRNAs (miRNAs) are attracting considerable attention as potential biomarkers for the early diagnosis of cancer. We have been developing a detection method for miRNAs on a microfluidic chip with external-power-free fluid pumping and enzyme-free amplification. The assay is completed within 20 min. Here, we describe the specificity of this miRNA detection method. First, the specificity against mismatched sequences was investigated. The nonspecific detection of a 2-nucleotide mismatched sequence was negligible, while that of a 1-nucleotide mismatched sequence was observed to a reasonable extent...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190835/a-label-free-turn-on-fluorescence-method-for-detecting-mercury-ion-in-aqueous-solution-based-on-n-methyl-mesoporphyrin-ix-nmm-g-quadruplex-dna
#15
Xingping Zhang, Baomiao Ding, Huawei Wu, Jiujun Wang, Hualin Yang
In the present work, a simple design of "turn-on" fluorescence method for mercury ion was developed and explored based on specific T-Hg-T mismatches as a recognizer and N-methyl mesoporphyrin IX (NMM)/G-quadruplex DNA system as a reporter. The titration experiment showed that the mercury-ion concentration and the fluorescence intensity signal change exhibited a consistent linear correlation within the 50 to 500 nM range with a detection limit down to 12.9 nM. In a selectivity experiment, our method showed obvious selectivity against other metal ions, being consistent with other reported detection methods of mercury ion based on the specific reactivity of T-Hg-T mismatches...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190834/perchlorate-selectivity-of-anion-exchange-resins-as-evaluated-using-ion-selective-electrodes
#16
Kenji Yamamoto, Shin'ya Mitsuda, Naomi Ohtake, Natsuki Murashige, Satoshi Ohmuro, Akio Yuchi
The selectivity coefficients reported for perchlorate of the high selectivity on anion exchange resins (AXRs) have not been consistent with one another. Possible errors by the unique use of four parameters (concentrations of two anions in two phases) were experimentally verified. The concentrations of perchlorate buffered at low levels (10(-6) - 10(-4) mol L(-1)) by two forms of AXRs were successfully determined by potentiometry with a perchlorate ion-selective electrode. This gave reasonable coefficients. The coefficients for perchlorate on several AXRs were independent of the relative exchange (RE), in contrast to the previous reports...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190833/determination-of-ammonium-in-aqueous-samples-by-gas-phase-light-scattering-using-hydrogen-chloride-gas-as-a-derivatizing-reagent-followed-by-nondispersive-atomic-fluorescence-spectrometry
#17
Xuchuan Duan, Jinliang Fang, Rui Sun
A sensitive method was developed for the determination of ammonium in an aqueous solution based on gas phase light scattering. In a stream of carrier gas, the gaseous ammonia from the alkalized solution formed a volatile ammonium chloride derivative by reacting with gaseous hydrogen chloride; the gaseous ammonium chloride was analyzed by nondispersive atomic fluorescence spectrometry. The mechanisms of the method are elucidated based on evaporative light scattering detection. Parameters such as temperature, amount of sodium hydroxide, and carrier gas flow rate were studied...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190832/dimerization-products-of-chloroprene-are-background-contaminants-emitted-from-altef-polyvinylidene-difluoride-gas-sampling-bags
#18
Jae Kwak, Maomian Fan, Jennifer A Martin, Darrin K Ott, Claude C Grigsby
Gas sampling bags have been used for collecting air samples. Tedlar bags are most commonly used, but bleed background chemicals such as N,N-dimethylacetamide and phenol. It is often necessary to remove the contaminant by flushing the bags with pure nitrogen or air. In this study, we identified four chloroprene dimerization products as background contaminants emitted from ALTEF bags that are made of a proprietary polyvinylidene difluoride (PVDF). No monomer chloroprene was detected in the bags analyzed. All of the dimers gradually increased once bags were filled with nitrogen due to diffusion from the bag surface...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190831/transduction-function-of-a-magnetic-nanoparticle-tmadm-for-stem-cell-imaging-with-quantum-dots
#19
Yusuke Ogihara, Hiroshi Yukawa, Daisuke Onoshima, Yoshinobu Baba
We investigated the transduction function of a cationic dextran hydroxypropyltrimethyl ammonium chloride-coated magnetic iron oxide nanoparticle (TMADM-03) for transducing quantum dots (QDs) into adipose tissue-derived stem cells (ASCs). As a result, the fluorescence intensity of ASCs labeled with QDs using TMADM-03 was much higher than that of QDs only labeling. These data suggest that TMADM-03 can be useful as a transduction agent for QDs in stem-cell imaging.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28190830/f%C3%A3-rster-resonance-energy-transfer-mediated-photoluminescence-quenching-in-stoichiometrically-assembled-cdse-zns-quantum-dot-peptide-labeled-black-hole-quencher-conjugates-for-matrix-metalloproteinase-2-sensing
#20
Sreenadh Sasidharan Pillai, Hiroshi Yukawa, Daisuke Onoshima, Vasudevanpillai Biju, Yoshinobu Baba
The steady state and time-resolved photoluminescence quenching of streptavidin modified CdSe/ZnS quantum dots (QDs) instigated by biotin-peptide-BHQ-1 (biotin-pep-BHQ-1) molecule was investigated. Here, we have achieved an efficient photoluminescence (PL) quenching of QDs with the conjugation of dark quencher (black hole quencher-BHQ) molecules intermediated with the GPLGVRGK peptide. The luminescence of streptavidin-QDs585 was decreased upon titration with a nano molar concentration of the biotin-GPLGVRGK-BHQ-1 molecule...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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