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Volume 60 (2012)
- Issue 6 Pages 65-
- Issue 5 Pages 51-
- Issue 4 Pages 43-
- Issue 2 Pages 21-
- Issue 1 Pages 5-
Volume 60, Issue 2
Displaying 1-3 of 3 articles from this issue
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Shio TAKAHASHI, Hiroko SHINOZAKI, Yoshihiro KANADA, Akio HANADA, Yutak ...2012 Volume 60 Issue 2 Pages 21-26
Published: April 01, 2012
Released on J-STAGE: April 25, 2012
JOURNAL FREE ACCESSPhosphate glass represents a potential substrate material for use in thermal transfer printing heads, because of its lower melting point and environmental friendliness compared with lead-based glass. However, conventional phosphate glass does not meet the practical criterion for durability against water. We found that the addition of cerium dramatically enhanced the water durability of phosphate glass, and that this was further improved by the addition of Al2O3. The aim of this study was to understand the mechanism for this enhanced water durability through TOF-SIMS analysis. The incorporation of cerium into conventional phosphate glass resulted in an increase negative fragment ions with a higher mass, indicating the presence of a highly polymerized phosphate structure, probably the longer chain structure was stabilized by chelation between cerium and oxygen. The ratio of linear chain structure to cyclic ring structure (polymetaphosphate) also increased when cerium was added. The spectrum of the Al2O3-added phosphate glass indicated that aluminum had been incorporated into polyphosphate chains and that this converted the chains from two-dimensional to three-dimensional structures. The intensity of fragment ions related to P4O10 decreases with an increase in the water durability of the glass samples.View full abstractDownload PDF (786K) -
Shinichi MUKOSAKA, Kanae TERAMOTO, Hideki KOIKE2012 Volume 60 Issue 2 Pages 27-32
Published: April 01, 2012
Released on J-STAGE: April 25, 2012
Advance online publication: February 27, 2012JOURNAL FREE ACCESSMatrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) is widely used for the analysis of not only biological materials but also synthetic polymers. A mass spectrum obtained by MALDI-MS was found to have peaks at equal intervals on the m/z axis. The chemical structure of many types of biological compounds contain repeating units that have exactly the same elemental composition. If these repeated peaks could be identified based on the m/z interval value, such analyses could be optimized even further from the point of view of chemical structure. In this study, we describe a system for visualizing such data that has the capability of analyzing the repeated peaks on the m/z axis. The system, mzRepeat, was developed and evaluated by applying the mass spectrum of polyethylene glycol and mycolic acid, which was obtained using a JMS-S3000 Spiral-TOFMS system. Because mzRepeat can systematically show a mass spectrum that includes different numbers of repeating units, it has the potential for use in analyzing these types of molecules.View full abstractDownload PDF (3394K)
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Fumihiro ITO, Tomoko NAKAMURA, Kentaro YAMAGUCHI2012 Volume 60 Issue 2 Pages 33-36
Published: April 01, 2012
Released on J-STAGE: April 25, 2012
Advance online publication: January 30, 2012JOURNAL FREE ACCESSWe have developed a new ionization method called ‘ionic probe attachment ionization,’ which uses lanthanide-complex-based ionic probes containing tetramethyl 2,6-bis(oxazolinyl)pyridine (TMpybox) ligands. Cold-spray ionization mass spectra of the lanthanide-series ionic probes are presented using NHS-TMpybox-binding lysine. The coordination ability of lanthanides, which is a fundamental property of these metals, was estimated by determining the stability of each complex at low spray temperature.View full abstractDownload PDF (750K)
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