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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/29225242/newly-developed-friction-tester-for-in-situ-soft-x-ray-absorption-measurements-of-frictional-engine-oil-metals-interfaces
#1
Yasuji Muramatsu, Masaru Okuyama, Naoko Takahashi, Toshihide Ohmori, Eric M Gullikson
A novel friction tester has been developed to clarify the friction mechanism between engine oil and metals by in situ/operando measurements of the X-ray absorption near edge structure (XANES) using the total electron yield (TEY) method. The tester can perform frictional motion with engine oil and metals in a vacuum chamber under a vacuum of 10-7 Torr during TEY-XANES measurements in BL-6.3.2 at the Advanced Light Source (ALS). From in situ XANES measurements in the C K and Fe L regions, the organic molecule layers at the oil/metals interfaces have been successfully observed...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225241/effect-of-the-elemental-composition-of-precursors-from-amino-acids-and-their-binary-mixtures-on-the-photoluminescent-intensity-of-carbon-nanodots
#2
Kotaro Morita, Shusei Kurusu, Haruka Kodama, Naoki Hirayama
We report on the photoluminescent (PL) properties of carbon nanodots (CNDs) doped with nitrogen and sulfur obtained by the pyrolytic carbonization of amino acids as precursors. Prepared CNDs exhibit stable PL emission under a wide variety of aqueous conditions. The results also provided the way to tune a PL intensity of CNDs by varying the amount of heteroatoms in precursors with a binary mixture of amino acids. The PL quantum yields of the obtained CNDs were determined to be from 0.079 to 0.571.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225240/a-fluorescence-quenching-assay-based-on-molecular-beacon-formation-through-a-ligase-detection-reaction-for-facile-and-rapid-detection-of-point-mutations
#3
Kensuke Sawamura, Masahiko Hashimoto
A fluorescence quenching assay based on a ligase detection reaction was developed for facile and rapid detection of point mutations present in a mixed population of non-variant DNA. If the test DNA carried a targeted mutation, then the two allele-specific primers were ligated to form a molecular beacon resulting in the expected fluorescence quenching signatures. Using this method, we successfully detected as low as 5% mutant DNA in a mixture of wild-type DNA (t test at 99% confidence level).
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225239/rapid-plasma-etching-for-fabricating-fused-silica-microchannels
#4
Kyojiro Morikawa, Kazuki Matsushita, Takehiko Tsukahara
In order to advance the performances of micro chemical and biochemical systems on a chip, the fabrication of microstructures such as channels and pillars is an essential basic technology. However, conventional fabrication methods based on wet etching have limitations in their applications for device engineering. In this study, we report on a new microchannel fabrication process on a fused silica substrate using photoresist and plasma etching based on C3F8, CHF3, and Ar gases. Deep, rectangular microchannels, having vertical angles close to 90°, 10 μm-scale deep and low surface roughness of less than 1 nm, could be fabricated on a fused silica substrate at high etching rates on the order of 5 - 7 nm s-1...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225238/distribution-equilibria-of-amphoteric-8-quinolinol-between-1-alkyl-3-methylimidazolium-bis-trifluoromethanesulfonyl-imide-and-aqueous-phases-and-their-effect-on-ionic-liquid-chelate-extraction-behavior-of-iron-iii
#5
Ayano Eguchi, Kotaro Morita, Naoki Hirayama
The distribution behavior of amphoteric 8-quinolinol (HQ) between ionic liquid (IL) phase and aqueous phase and ionic liquid chelate extraction behavior of iron(III) with HQ were investigated using four 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (CnmimTf2N, n = 2, 4, 6 and 8) ILs. Not only neutral HQ but also cationic H2Q+ were distributed into the IL phase, and the latter distribution based on cation-exchange with Cnmim+ was pronounced in the use of IL having a less-hydrophobic cation, such as C2mim+...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225237/a-biotin-streptavidin-enhanced-carbon-nanotube-amplification-strategy-for-an-ultrasensitive-immunodetection-of-polybrominated-diphenyl-ethers
#6
Xiaohan Zhang, Huisheng Zhuang
The extensive use of polybrominated diphenyl ethers (PBDEs) has resulted in its increasingly widespread presence. Especially the lower halogenated PBDEs accumulate to a greater degree than the higher halogenated PBDEs in house dust, sewage sludge, pets, or even humans. In the present work, we developed an ultrasensitive biotin-streptavidin-enhanced carbon nanotube amplification strategy for the immunodetection of PBDEs, in which single-walled carbon nanotubes were used to immobilize numerous streptavidin. Meanwhile, we used biotin conjugated horseradish peroxidase (B-HRP) and biotin conjugated Goat anti-rabbit (B-IgG) to link the HRP and IgG to CNTs by using a biotin-streptavidin system...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225236/microfluidic-platform-for-analyzing-the-thermotaxis-of-c-elegans-in-a-linear-temperature-gradient
#7
Sunhee Yoon, Hailing Piao, Tae-Joon Jeon, Sun Min Kim
Caenorhabditis elegans (C. elegans), which shares a considerable amount of characteristics with human genes is one of the important model organisms for the study of behavioral responses. Thermotaxis is a representative behavior response of C. elegans; C. elegans stores the cultivation temperature in thermosensory neurons and moves to the cultivation temperature region in a temperature variation. In this study, we developed a microfluidic system for effective thermotaxis analysis of C. elegans. The microfluidic channel was fabricated using polydimethylsiloxane (PDMS) by soft lithography process...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225235/solid-phase-extraction-of-trace-al-iii-fe-ii-co-ii-cu-ii-cd-ii-and-pb-ii-ions-in-beverages-on-functionalized-polymer-microspheres-prior-to-flame-atomic-absorption-spectrometric-determinations
#8
Hale Berber, Güzin Alpdogan
In this study, poly(glycidyl methacrylate-methyl methacrylate-divinylbenzene) was synthesized in the form of microspheres, and then functionalized by 2-aminobenzothiazole ligand. The sorption properties of these functionalized microspheres were investigated for separation, preconcentration and determination of Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II) ions using flame atomic absorption spectrometry. The optimum pH values for quantitative sorption were 2 - 4, 5 - 8, 6 - 8, 4 - 6, 2 - 6 and 2 - 3 for Al(III), Fe(II), Co(II), Cu(II), Cd(II) and Pb(II), respectively, and also the highest sorption capacity of the functionalized microspheres was found to be for Cu(II) with the value of 1...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225234/a-planar-bilayer-lipid-membrane-sensor-using-a-miniaturized-auto-patch-system
#9
Taiga Zamoto, Satoshi Tominaga, Masato Nishio, Atsushi Shoji, Masao Sugawara
A bilayer lipid membrane sensor was constructed with a miniaturized auto-patch system. The performance of the patch system was optimized to obtain an analytically relevant signal. A biosensor based on an anti-BSA-antibody as a receptor and gramicidin as a signal transduction element was demonstrated. The sensor for BSA exhibited a detection limit of pg/mL level for BSA.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225233/copper-nanoparticles-for-ascorbic-acid-sensing-in-water-on-carbon-screen-printed-electrodes
#10
Anastasiia V Shabalina, Valery A Svetlichnyi, Ksenia A Ryzhinskaya, Ivan N Lapin
A carbon screen-printed electrode was modified with copper nanoparticles from their dispersion obtained via pulsed laser ablation of a copper target in ethanol. The modified electrode exhibited activity in ascorbic acid electrochemical oxidation, giving an anodic current peak on voltammograms. Linear sweep and cyclic voltammetry have shown a linear dependence of the signal (both peak height and peak area) on the ascorbic acid concentration. The linear range from 1 to 250 μM of ascorbic acid was studied, and the detection limit was experimentally found to be 0...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225232/effect-of-ultraviolet-irradiation-on-proton-transfer-facilitated-by-5-10-15-20-tetraphenyl-21h-23h-porphine-and-its-metal-complexes-at-a-water-1-2-dichloroethane-interface
#11
Tomoya Kubo, Manaki Ashida, Shiori Otagiri, Haruka Nozue, Souma Makigaki, Teruo Hinoue
We examined photochemical effects by ultraviolet irradiation on facilitated proton transfer at a water/1,2-dichloroethane (W/DCE) interface by ion-transfer voltammetry using a Xe flash lamp. 5,10,15,20-Tetraphenyl-21H,23H-porphine (H2TPP) or its metal complex, such as cobalt (Co(II)TPP), zinc (Zn(II)TPP), and nickel (Ni(II)TPP) complexes, was added into the DCE phase as an ionophore for the facilitated proton transfer. After we irradiated the W/DCE interface through the W phase, the voltammetric waves for proton transfer facilitated by H2TPP and Co(II)TPP were remarkably enhanced and shifted to the lower potential region, compared to those before irradiation...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225231/kinetic-determination-of-lanthanum-iii-by-the-catalytic-effect-on-the-oxidation-of-fluorescent-safranine-dyes-with-potassium-bromate
#12
Li Sheng, Zhihui Zhao, Biquan Su, Caihong Tao, Wangli Jing
Two simple and sensitive kinetic-fluorometric methods have been developed for the determination of lanthanum(III): fluorescence quenching generated by the oxidation of safranine T or phenosafranine with potassium bromate in an acetate buffer solution. The rate of the oxidation reaction is significantly accelerated after adding lanthanum(III). A good linearity between the relative fluorescence intensity and lanthanum(III) is observed in the range of both 0.04 - 2.0 and 4.0 - 16 μg/mL. The detection limits have been 3...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225230/in-situ-measurement-of-the-ph-dependent-transmission-infrared-spectra-of-aqueous-lactic-acid-solutions
#13
Takuji Ube, Yasuko Yoneyama, Takashi Ishiguro
The transmission infrared absorption spectra of an aqueous lactic acid solution was measured over a pH range of 2.66 - 1.59 using a cell with an optical path length of 12 μm. Absorption peaks were then identified by density functional theory (DFT) calculations. The observed pH-dependent changes in the absorbance spectra were consistent with the properties of the assigned functional groups. We therefore believe that the present method can be applied to the contactless and non-invasive quantitative evaluation of pH values in aqueous systems, such as bioprocesses and bioimaging...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225229/nhs-based-tandem-mass-tagging-of-proteins-at-the-level-of-whole-cells-a-critical-evaluation-in-comparison-to-conventional-tmt-labeling-approaches-for-quantitative-proteome-analysis
#14
Dominik A Megger, Leona L Pott, Kristin Rosowski, Birgit Zülch, Stephanie Tautges, Thilo Bracht, Barbara Sitek
Tandem mass tags (TMT) are usually introduced at the levels of isolated proteins or peptides. Here, for the first time, we report the labeling of whole cells and a critical evaluation of its performance in comparison to conventional labeling approaches. The obtained results indicated that TMT protein labeling using intact cells is generally possible, if it is coupled to a subsequent enrichment using anti-TMT antibody. The quantitative results were similar to those obtained after labeling of isolated proteins and both were found to be slightly complementary to peptide labeling...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225228/zinc-ion-immobilized-magnetic-microspheres-for-enrichment-and-identification-of-multi-phosphorylated-peptides-by-mass-spectrometry
#15
Se Won Bae, Jae Il Kim, Inseong Choi, Jiha Sung, Jong-In Hong, Woon-Seok Yeo
The selective isolation of phosphorylated peptides and subsequent analysis using mass spectrometry is important for understanding how protein kinase and phosphatase signals can precisely modulate the on/off states of signal transduction pathways. However, the isolation and detection of multi-phosphorylated peptides is still limited due to their distinct affinity to various materials and their poor ionization efficiency. Here, we report a highly efficient and selective enrichment of phosphorylated peptides using binuclear Zn2+-dipicolylamine complex-coated magnetic microspheres (ZnMMs)...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225227/selective-detection-of-carcinogenic-aromatic-diamines-in-aqueous-solutions-using-4-n-chloroformylmethyl-n-methylamino-7-nitro-2-1-3-benzoxadiazole-nbd-cocl-by-hplc
#16
Naoko Inoue
Reaction conditions for the selective derivatization of three types of aromatic diamines without clean-up in an aqueous solution using 4-(N-chloroformylmethyl-N-methylamino)-7-nitro-2,1,3-benzoxadiazole (NBD-COCl) have been developed for simple, fast, and selective analysis by HPLC. The aromatic amines were derivatized to give di-NBD-CO-aromatic amines at 35°C for 5 min in a buffer solution at pH 5 containing a low acetonitrile concentration (0 - 400 ng/mL, n = 5, r >0.998). The retention times of these di-NBD-CO-aromatic amines were <5 min...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225226/a-novel-biosensor-based-on-terminal-protection-and-fluorescent-copper-nanoparticles-for-detecting-potassium-ion
#17
WenJing Deng, Chang Liu, YanLei Hu, RuQin Yu, TingTing Chen, Xia Chu
A novel biosensor for sensitively detecting potassium ion (K+) has been developed based on fluorescent copper nanoparticles (Cu NPs). In our design, we employ a label-free single-strand DNA (ssDNA) that contains two parts. One is 3'-terminus structure-switching aptamers (SSAs) that can fold into G-quadruplex after binding with its target K+. The other is 5'-terminus poly thymine (polyT) which works as a template to construct fluorescent Cu NPs. After incubating with K+, the part SSAs go through target-induced conformational changes...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225225/internal-standard-amplitude-modulated-multiplexed-flow-analysis
#18
Takuya Sumitomo, Mari Osaki, Takeshi Ogusu, Masaki Takeuchi, Hideji Tanaka
A new concept of flow analysis, internal standard-amplitude modulated multiplexed flow analysis, is proposed. A proof of concept was verified by applying it to the determination of ferrous ion (Fe2+) by 1,10-phenanthroline (o-Phen) spectrophotometry. The flow rates of sample solutions containing Methylene Blue (MB) as an internal standard substance were sinusoidally varied at different frequencies. The solutions were merged with a color reagent (o-Phen) solution, while the total flow rate was held constant...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225224/characterization-of-melanin-radicals-in-paraffin-embedded-malignant-melanoma-and-nevus-pigmentosus-using-x-band-epr-and-epr-imaging
#19
Kouichi Nakagawa, Satoko Minakawa, Daisuke Sawamura, Hideyuki Hara
Continuous wave electron paramagnetic resonance (CW EPR) and X-band (9 GHz) EPR imaging (EPRI) were used to nondestructively investigate the possible differentiation between malignant melanoma (MM) and nevus pigmentosus (NP) melanin radicals in paraffin-embedded specimens. The EPR spectra of both samples were analyzed using linewidth, spectral pattern, and X-band EPRI. The CW-EPR spectra of the MM showed an additional signal overlap. Eumelanin- and pheomelanin-related radicals were observed in the MM specimens...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/29225223/ph-independent-recognition-of-polyhydroxy-compounds-by-niobium-v-porphyrin-complex-with-unique-sugar-selectivity
#20
Takuya Doi, Norihide Kachikawa, Takashi Yasui, Akio Yuchi
The niobium(V) complex with tetraphenylporphin having OH- as an auxilliay ligand exists as a dimeric complex, [Nb2(tpp)2O3] at a total concentration >10-4.5 mol dm-3, and reacts with an aliphatic or aromatic polyhydroxy compound to form a monomeric complex containing chelate rings by coordination of the deprotonated species, and to cause an appreciable UV-Vis spectral change. In contrast to phenylboronic acid (PBA), the reactivity of [Nb2(tpp)2O3] is independent of pH at least between 4 and 8. Aliphatic comounds are more reactive than aromatic compounds in dioxane-water, while the reactivity order is reversed in the two-phase reaction...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
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