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HAN, Jee Hoon,CHOI, Han Nim,PARK, Sejin,CHUNG, Taek Dong,LEE, Won-Yong The Japan Society for Analytical Chemistry 2010 Analytical sciences Vol.26 No.9
<P>A simple amperometric detection (AD) method based on mesoporous platinum (Pt) electrodes has been developed for the determination of sugars (glucose, fructose, and sucrose) with high-performance anion-exchange chromatography (HPAEC). The amperometric detection is based on the direct oxidation of sugars on mesoporous Pt films formed on a gold electrode. The mesoporous Pt electrode (roughness factor of 243) sensitively responded to glucose, fructose, and sucrose in 80 mM sodium hydroxide solution as an alkaline mobile-phase for HPAEC. Under the optimum conditions, the limits of detection (<I>S/N</I> = 3) in these sugars were 0.24, 0.29, and 1.8 mM, for glucose, fructose, and sucrose, respectively. The reproducibility (relative standard deviation) of the measurements was less than 3.5%. The present method was applied to the determination of sugars in apple juice. The recoveries for all sugars ranged from 97 to 99%.</P>
Ma, Chang-Jin,Hwang, Kyung-Chul,Kim, Ki-Hyun Japan Society for Analytical Chemistry 2013 Analytical sciences Vol.29 No.8
<P>This study was carried out to describe the chemical characteristics of individual residual particles in hexagonal snow crystals, which can provide a clue to the aerosol removal mechanism during snowfall. In the present study, to collect snow crystal individually and to identify the elemental composition of individual residues retained in a hexagonal crystal, an orchestration of the replication technique and micro-particle induced X-ray emission (micro-PIXE) analysis was carried out. Information concerning the elemental compositions and their abundance in the snow crystals showed a severe crystal-to-crystal fluctuation. The residues retained in the hexagonal snow crystals were dominated primarily by mineral components, such as silica and calcium. Based on the elemental mask and the spectrum of micro-PIXE, it was possible to presume the chemical inner-structure as well as the elemental mixing state in and/or on the individual residues retained in single snow crystals.</P>
Development of an albumin copper binding (ACuB) assay to detect ischemia modified albumin.
Eom, Ji-Eun,Lee, Eunyoung,Jeon, Kyung-Hwa,Sim, Jeongeun,Suh, Minah,Jhon, Gil-Ja,Kwon, Youngjoo Japan Society for Analytical Chemistry 2014 Analytical sciences Vol.30 No.10
<P>Myocardial ischemia (MI) induces many changes in the body, including pH decrease and electrolyte imbalance. No obvious symptoms of MI appear until irreversible cellular injuries occur. Since early treatment is critical for recovery from ischemia, the development of reliable diagnostic tool is demanded to detect the early ischemic status. Ischemia modified albumin (IMA), formed by cleavage of the last two amino acids of the human serum albumin (HSA) N-terminus, has been considered so far as the most trustworthy and accurate marker for the investigation of ischemia. IMA levels are elevated in plasma within a few minutes of ischemic onset, and may last for up to 6 h. In the present study, we developed a novel assay for the examination of IMA levels to ameliorate the known albumin cobalt binding (ACB) test established previously. We observed a stronger copper ion bound to the HSA N-terminal peptide than cobalt ion by HPLC and ESI-TOF mass spectrometric analyses. The copper ion was employed with lucifer yellow (LY), a copper-specific reagent to develop a new albumin copper binding (ACuB) assay. The parameters capable of affecting the assay results were optimized, and the finally-optimized ACuB assay was validated. The result of the IMA level measurement in normal versus stroke rat serum suggests that the ACuB assay is likely to be a reliable and sensitive method for the detection of ischemic states.</P>