著者

小林 良夫 能美 隆 下池 洋一 上野 浩志 前川 麻弥 鈴木 克裕 川本 範之 山地 松夫 佐藤 隆

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.51, no.1, pp.205-215, 2003 (Released:2007-10-16)

参考文献数

4

被引用文献数

3 2

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The purpose of this study is to estimate the amounts of kerosene poured at the scene of arson. Several analytical methods have been carried out to detect kerosene in fire debris. There is no study to compare the methods quantitatively. First we discussed comparison about several analytical methods, and got the conclusion that the most sensitive method was found to be the analysis using gas chromatography/mass spectrometry (GC/MS) after extracting by ether. The detection limit of this methed was 0.05 µg/g.The kerosene concentration of tatami had an effect on the condition of combustion. We estimated the diffusion speed of kerosene sprinkled on tatami. We conducted experiments to check the condition of tatami burning, due to the amount of kerosene. Furthermore, we showed the evidence to get fire debris from the inside not the surface to get information about the kerosene amount.

著者

澤 竜一

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.64, no.3, pp.101-104, 2016-06-01 (Released:2016-06-15)

参考文献数

19

著者

中山 洋

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.64, no.3, pp.105-109, 2016-06-01 (Released:2016-06-15)

参考文献数

25

著者

中山 登 西村 俊秀

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.64, no.2, pp.65-69, 2016-04-01 (Released:2016-04-15)

参考文献数

20

著者

平山 明由 曽我 朋義

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.64, no.2, pp.61-64, 2016-04-01 (Released:2016-04-15)

参考文献数

12

被引用文献数

1

著者

川村 猛

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.64, no.2, pp.75-79, 2016-04-01 (Released:2016-04-15)

参考文献数

27

著者

中根 良平 栗原 修

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.11, no.24, pp.167-172, 1964-03-30 (Released:2010-06-28)

参考文献数

20

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The values of single-stage separation factor for the boron isotope exchange between boron fluoride gas and its weak complexes that are stable only at low temperatures are determined by means of the shaking-type gas-liquid contactor and mass spectrometer.

著者

高岡 宣雄

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.37, no.6, pp.343-351, 1989 (Released:2007-05-01)

被引用文献数

14 10

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The assumption that the 40Ar/36Ar ratio of Ar trapped in volcanic rocks at eruption is atmospheric often gives a large systematic error in the K-Ar dating of Quaternary volcanic rocks younger than 1 Ma. There are two possible sources of error, the existence of excess Ar and mass-fractionated, initial Ar.The major source of excess Ar is supposed to be magma. The 40Ar/36Ar ratio for magmatic Ar in the North-East Japan arc is tentatively estimated to be 340±10 from measurements of Ar in large phenocrysts separated from Quaternary volcanic rocks. Separation of phenocrysts is the most effective to decrease the systematic error caused by excess Ar.The mass-fractionation of initial Ar should give the 38Ar/36Ar ratio which was changed from the atmospheric ratio. This can be checked by determining the 38Ar/36Ar ratio in samples. A peak-height comparison method is preferential to an isotope dilution method in the K-Ar dating of very young volcanic rocks because with the former, both the amount of Ar and the 38Ar/36Ar ratio in a sample can be determined at one measurement, while with the latter, an additional measurement is needed to know the 38Ar/36Ar ratio in the sample. Further, the statistical error in the isotope dilution method overwhelms that of the peakheight comparison method for large atmospheric Ar correction (e.g., 83% correction for 1% relative errors of isotopic ratio measurements). Since the systematic error caused by the mass-fractionated, initial Ar increases greatly with the increasing atmospheric Ar correction, it is important to correct the result for the mass-fractionation. Correction formulae are given.The error sources other than those mentioned above are uncertainty in the blank correction and instabilities in the sensitivity of spectrometer and the Ar isotopic ratio measurement. Especially, Ar in Al- or other metal foil should be taken into consideration for the blank correction. In order to increase accuracy of the K-Ar age obtained, to check the systematic errors by measuring samples together with standard samples is of great importance in the K-Ar dating of very young volcanic rocks.A measurable limit of K-Ar age is affected greatly by the atmospheric Ar correction. For andesites containing 5×10-11 ccSTP 36Ar/g and 2 wt% K, the limit is estimated to be 0.004 Ma for 98% atmospheric Ar correction. For most of Japanese Quaternary lavas which contain 2×10-10 ccSTP 36Ar/g and 2 wt% K, the limit is 0.015 Ma for the same atmospheric Ar correction.

著者

松本 哲一 宇都 浩三 柴田 賢

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.37, no.6, pp.353-363, 1989 (Released:2007-05-01)

被引用文献数

11 8

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Precise determination of argon isotopic ratios was made on twenty-seven historic lavas from Japan. Their isotopic ratios were mostly mass fractionated from that of the atmospheric argon toward the enrichment in lighter isotopes. This suggests that the correction for the mass fractionated initial 40Ar/36Ar ratio is very important for the K-Ar dating of volcanic rocks younger than 0.1 Ma. The limit of measurable K-Ar age is estimated to be 0.03 Ma for a normal andesitic lava having a fractionated initial argon.

著者

杉浦 悠毅

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.63, no.6, pp.159-162, 2015-12-01 (Released:2015-12-26)

参考文献数

2

著者

田中 耕一

出版者

日本質量分析学会

雑誌

質量分析 = Mass spectroscopy (ISSN:13408097)

巻号頁・発行日

vol.45, no.1, pp.113-121, 1997-02-01

著者

二見 順 入江 浩彰 大江 修造 西 功

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.47, no.6, pp.386-388, 1999 (Released:2007-10-16)

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In recent studies, it has been revealed that Helicobacter pylori (HP) causes stomach cancer, stomach ulcers, duodenal ulcers and chronic gastritis. The 13C-urea breath test (UBT) is one of the diagnostic methods for HP infection. A new UBT method with the respiratory mass spectrometer developed by authors continuously measures with on-line the amount of decomposed 13C-urea in the stomach after the administration of 13C-urea. Trial examinations by the new method were carried out with two subjects; one was diagnosed positive of HP infection and the other was negative by clinical examinations. Significant difference was found in the amount of decomposed 13C-urea between both subjects. The results presented in this paper demonstrate that the new UBT method is applicable to the clinical use in the diagnosis of HP infection.

著者

Joseph A. Loo Sabrina A. Benchaar Jiang Zhang

出版者

日本質量分析学会

雑誌

Mass Spectrometry (ISSN:2187137X)

巻号頁・発行日

vol.2, no.Special_Issue, pp.S0013-S0013, 2013-04-15 (Released:2013-05-03)

参考文献数

35

被引用文献数

2 5

---

Native protein mass spectrometry (MS), the measurement of proteins and protein complexes from non-denaturing solutions, with electrospray ionization (ESI) has utility in the biological sciences. Protein complexes exceeding 1 MDa have been measured by MS and ion mobility spectrometry (IMS), and the data yields information not only regarding size, but structural details can be revealed also. ESI-IMS allows the relative stability of protein–ligand binding to be measured. Top-down MS, the direct dissociation of the intact gas phase biomolecule, can generate sequence and identity information for monomeric (denatured) proteins, and topology information for noncovalent protein complexes. For protein complexes with small molecule ligands, i.e., drugs, cofactors, metals, etc., top-down MS with electron capture dissociation can be used to elucidate the site(s) of ligand binding. Increasing protein ESI charging, e.g., supercharging, enhances the efficiency for dissociation of protein complexes.

著者

Carlito B. Lebrilla

出版者

日本質量分析学会

雑誌

Mass Spectrometry (ISSN:2187137X)

巻号頁・発行日

vol.2, no.Special_Issue, pp.S0016-S0016, 2013-04-15 (Released:2013-05-03)

参考文献数

18

被引用文献数

1 3

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The role of glycosylation and their biological functions whether as free oligosaccharides or glycoconjugates has been made possible by the recent advancements in the analyses of these compounds. The heterogeneity and the large structural diversity have made oligosaccharide analysis significantly more difficult than other biopolymers. The next stage of development is to achieve high throughput analysis. However, the structural elucidation of oligosaccharides remains an extremely difficult task. Recent reports reveal that the diversity of structures in a given biological system is finite and may not be large. It may be possible to create a database of structures that can be used to determine the identity of known compounds. This capability would therefore make high throughput glycomics possible. Achieving this task depends on the proper selection of chemical characteristics to identify the compound. In this presentation, nanoflow liquid chromatography retention times, accurate mass, and tandem MS is used to determine structure with a high degree of certainty. The method is used to determine the biological function of milk oligosaccharides as well as to discover glycan-based biomarkers for diseases.

著者

井上 清 小林 唯男 谷口 薫

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.14, no.5, pp.265-274, 1966-12-25 (Released:2010-06-28)

参考文献数

4

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A fundamental study was performed on the mass spectrometric determination of the ratios of uranium and fission products in the uranium dioxide specimen irradiated in the nuclear reactor. Mass spectrometer used in this experiment was a 90° sector type with a 350 mm radius of curvature, made by Hitachi, Ltd. In the period of the experiment, this spectrometer was equipped with a thermal-ionization source. The specimen dissolved in nitric acid was pipetted and evaporated to dryness on a filament, and then was analysed in the single filament arrangement. From the results it has been found that: (1)By isotopic analysis of uranium, the contribution to burnup of the specimen by fission of U235was determined as 4, 370 MWD/T. The loss of U235in neutron capture reaction during inadiation was corrected by the ratio of U236to U235. (2)The burnup of the specimen can be determined from the amount of a fission product formed during irradiation. Because of known contribution of the burnup by fission of U235mentioned above, the contribution of burnup of the specimen by fission of Pu239 might be determined by excessive formation of fission product. As the number of fissions of Pu239 was estimated, the burnup of the specimen was calculated as approximately 7, 980 MWD/T. (3)Experience with the mass spectrometric analysis was obtained for the radioactive specimen. The noticeable phenomenon was the increase in the emissivity of ion current at relatively law heating current through filament under the existence of beta-rays emitter.

著者

佐々木 申二

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.1953, no.1, pp.1-7, 1953 (Released:2010-06-28)

被引用文献数

1

著者

久田 美貴

出版者

日本質量分析学会

雑誌

Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)

巻号頁・発行日

vol.51, no.1, pp.310-316, 2003 (Released:2007-10-16)

参考文献数

14

被引用文献数

1 2

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We examined the applicability of the “nested” collision induced dissociation/post-source decay (CID/PSD) method to sequencing of novel peptides from solitary wasps which have neurotoxic venom for paralyzing other insects. The CID/PSD spectrum of a ladder peptide derived from an exopeptidase digest was compared with that of the intact peptide. The mass peaks observed only in the CID/PSD spectrum of a ladder peptide were extracted as C-terminal fragment ions. Assignment of C-terminal fragment ions enabled calculation of N-terminal fragment masses, leading to differentiation between N-terminal fragment ions and internal fragment ions. Furthermore, a method incorporating nested CID/PSD combined with endopeptidase digestion is described as an approach to determine the sequence of N-terminally modified peptides. The information from immonium and related ions observed in the CID/PSD spectrum was used for the selection of a suitable endopeptidase for the digestion of peptides. These nested CID/PSD methods allowed rapid and sensitive identification by removing ambiguity in the assignment of the fragment ions, and proved useful for sequencing unknown peptides, in particular those available as natural products with a limited supply.