Analytical Sciences

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Square-wave Adsorptive Anodic Stripping Voltammetric Determination of Antidiabetic Drug Linagliptin in Pharmaceutical Formulations and Biological Fluids Using a Pencil Graphite Electrode
Analytical Sciences - Tập 36 - Trang 1031-1038 - 2020
Ahmed H. Naggar, Gamal A. Saleh, Mahmoud A. Omar, Ahmed M. Haredy, Sayed M. Derayea
A simple, sensitive, low-cost, quick and reliable square-wave anodic stripping voltammetric method is described for the determination of the antidiabetic drug Linagliptin (LNG) in pure form, tablets, and spiked human urine and plasma samples. Using a pencil graphite electrode (PGE), cyclic voltammetry (CV) was applied to study the electrochemical behavior of LNG. In a Teorell-Stenhagen buffer (pH ... hiện toàn bộ
Unique Anion-exchange Properties of 3,3′-Diaminobenzidine Resulting in High Selectivity for Rhodium(III) over Palladium(II) and Platinum(IV) in a Concentrated Hydrochloric Acid Solution
Analytical Sciences - Tập 35 - Trang 1353-1360 - 2019
Tomoya Suzuki, Takeshi Ogata, Mikiya Tanaka, Tohru Kobayashi, Hideaki Shiwaku, Tsuyoshi Yaita, Hirokazu Narita
The effective recovery of Rh(III) from mixtures also containing Pd(II) and Pt(IV) is one of the most difficult tasks in platinum group metal refining. Adding 3,3′-diaminobenzidine (DAB) to 7 and 10 M HCl aqueous solutions containing Rh(III), Pd(II), and Pt(IV) chlorido species affords the effective separation of Rh(III) from Pd(II) and Pt(IV) through a process where Rh(III) becomes sequestered int... hiện toàn bộ
Influence of Contact Force on Electrochemical Responses of Redox Species Flowing in Nitrocellulose Membrane at Micropyramid Array Electrode
Analytical Sciences - Tập 31 Số 7 - Trang 729-732 - 2015
Wataru Iwasaki, Ramachandra Rao Sathuluri, Osamu Niwa, Masaya Miyazaki
Analytico- Chemical Evidence for Differentiation of Amino Acid Enantiomers in Aqueous Solutions of Physiological Salinity
Analytical Sciences - Tập 8 - Trang 589-597 - 1992
Shizuo Fujiwara
The enantiomeric isomers of organic compounds usually appear in the racemic form in synthetic reactions of the laboratory. However, each of the isomers must somehow be differentiated from the others in biosynthetic reactions, such as of proteins. This differentiation is possible in a bio-reaction because of a salt concentration of about 0.1 mol/ 1 NaCl and the presence of oxygen in the aqueous med... hiện toàn bộ
Determination of Sub-nmol Hydrogen Peroxide by Electrochemiluminescence of Luminol in Aqueous Solution
Analytical Sciences - Tập 4 - Trang 9-12 - 1988
Sachiko Sakura, Hideo Imai
An electrochemiluminescence method was developed for determination of sub-nmol hydrogen peroxide in aqueous solution. Luminol was electrochemically oxidized, then reacted with hydrogen peroxide; it emitted light of the maximum wavelength of 436 nm with a half-life of less than 0.2 s from the electrode surface. In flow injection analysis a carrier solution (phosphate buffer, pH 7–9) containing 17 μ... hiện toàn bộ
Chemical Effects of CeLγ4 Emission Spectra for Ce Compounds
Analytical Sciences - Tập 26 - Trang 885-889 - 2010
Hisashi Hayashi, Yuki Takehara, Naomi Kawamura, Masaichiro Mizumaki
High-resolution CeLγ4 emission spectra of CeF3, Ce2S3, CeF4, and CeO2 have been measured using a multicrystal, multidetector spectrometer. The spectra exhibited substantial differences depending on the chemical environment of the Ce ions. By comparing the observed CeO2 spectrum with the band calculations, we determined that the observed chemical effects of the main emission line were primarily att... hiện toàn bộ
Oxygenation Mechanism of Ions in Dynamic Reaction Cell ICP-MS
Analytical Sciences - Tập 29 - Trang 747-752 - 2013
Tomohiro Narukawa, Koichi Chiba
A dynamic reaction cell (DRC) is one of the most effective tools for eliminating spectral interferences caused by polyatomic molecules in inductively coupled plasma mass spectrometry (ICP-MS). Oxygen gas (O2), by producing oxygenated ions, is very effective in reducing some specific spectral interferences. In this study, the oxygenation of elemental ions (M+) in the DRC was investigated experiment... hiện toàn bộ
Separation and Characterization of Manganese(II,III) Chlorophylls
Analytical Sciences - Tập 7 - Trang 121-124 - 1991
Saijun Li, Hidenari Inoue
Manganese(III) chlorophyll-a[Mn(III)-chl-a] has been synthesized in almost pure form from pheophytin-a and manganese(II) acetate. A good separation of Mn(III)-chl-a has been achieved by reversed-phase high performance liquid chromatography. The chromatographic behavior, absorption spectra and elemental analyses have demonstrated that manganese(II) chlorophyll-a [Mn(II)-chl-a] and Mn(III)-chl-a are... hiện toàn bộ
Grazing Incidence X-ray Diffraction Analysis of Zeolite NaA Membranes on Porous Alumina Tubes
Analytical Sciences - Tập 22 - Trang 961-964 - 2006
Tomohiro Kyotani
Zeolite NaA-type membranes hydrothermally synthesized on porous alumina tubes, for dehydration process, were characterized by grazing incidence 2θ scan X-ray diffraction analysis (GIXRD). The fine structure of the membrane was studied fractionally for surface layer and for materials embedded in the porous alumina tube. The thickness of the surface layer on the porous alumina tube in the membranes ... hiện toàn bộ
Distribution Equilibria of 2-(2-Pyridylazo)-5-methylphenol and Its Zinc(II) Chelate between Two Phases Separated from a Micellar Solution of a Nonionic Surfactant
Analytical Sciences - Tập 1 - Trang 41-45 - 1985
Shigeru Kawamorita, Hiroto Watanabe, Kensaku Haraguchi
Distribution equilibria of 2-(2-pyridylazo)-5-methylphenol (PAP-5-Me) and its zinc(II) chelate have been studied between two phases which were formed from a micellar solution of poly(oxyethylene)-4-nonylphenyl ether with 7.5 oxyethylene units (PONPE-7.5). One phase was rich in PONPE-7.5 and the other was the aqueous phase. The volume ratio of the former to the latter was about 0.6:49.5 under the p... hiện toàn bộ
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