OHTANI Hajime

写真a

Affiliation Department etc.

Department of Life Science and Applied Chemistry
Department of Life Science and Applied Chemistry

Title

Professor

Mail Address

E-mail address

Degree

  • Nagoya University -  Doctor of Engineering

External Career

  • 1998.04
    -
    2005.03

    Associate Professor, Graduate School of Engineering, Nagoya University   Associate Professor (as old post name)  

  • 1995.04
    -
    1998.03

    Associate Professor, Center for Integrated Research in Science and Engineering   Associate Professor (as old post name)  

  • 1986.07
    -
    1995.03

    Assistant Professor, School of Engineering, Nagoya University   Research Assistant  

Academic Society Affiliations

  • 2014.03
    -
    Now

    The Society of Rubber Science and Technology, Japan

  • 2012.10
    -
    Now

    Tha Mass Specttrometry Society of Japan

  • 2002.06
    -
    2018.06

    American Chemical Society

  • 1998.04
    -
    Now

    Materials Life Society, Japan

  • 1992.05
    -
    Now

    The Japan Scientist Association

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Field of expertise (Grants-in-aid for Scientific Research classification)

  • Polymer chemistry

  • Analytical chemistry

 

Research Career

  • Study on Degradation and Modification of Polymeric Materials

    Collaboration in Japan   (not selected)  

    Project Year:  1986.01  -  Now

  • Basis and Application of Pyrolysis-Gas Chromatography

    International Collaboration   (not selected)  

    Project Year:  1980.04  -  Now

  • Structural Characterization of Polymers

    International Collaboration   (not selected)  

    Project Year:  1980.04  -  Now

Papers

  • Effects of hydrothermal carbonization on products from fast pyrolysis of cellulose

    Isa Güdücü, Koray Alper, Tolgahan Evcil, KubilayTekin, Hajime Ohtani, Selhan Karagöz

    Journal of the Energy Institute ( Elsevier )  99   299 - 306   2021.12  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    In the first step of this study, the hydrothermal carbonization (HTC) of cellulose was performed at 225 and 250 °C for 4, 8 and 12 h. The effect of temperature and residence time on hydrochar (HC) yields and characteristics was investigated, and the highest hydrochar yield had a heating value of 21.06 MJ/kg. In the second step, cellulose and hydrochar-derived cellulose was subjected to fast online pyrolysis at 500, 600 and 700 °C, using a pyrolysis-gas chromatography-mass spectrometry system. The HTC process significantly affected the pyrolysis products. The major decomposition product resulting from the fast pyrolysis of cellulose was levoglucosan, but at all tested temperatures, 2-methylfuran was the major product from hydrochars. Increasing the pyrolysis temperature caused a decrease in the relative yield of 2-methylfuran. Another prominent compound observed in pyrolyzates was 2,5-dimethylfuran. The relative yields of these two compounds decreased when the residence time of the HTC process was increased. The highest 2-methylfuran selectivity was 67.4%, while the highest 2,5-dimethylfuran selectivity among the furanic compounds was 24.0%. This study demonstrated that, by combining HTC and pyrolysis processes, fine chemicals can be produced from cellulose.

  • End group analysis of poly(methylmethacrylate)s using the most abundant peak in electrospray ionization-ion mobility spectrometry-tandem mass spectrometry and Fourier transform–based noise filtering

    Mizuki Omae, Yuka Ozeki, Shinya Kitagawa, Hajime Ohtani

    Rapid Communications in Mass Spectrometry ( Wiley )  35   e9176   2021.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Rationale
    We recently developed the characterization method for synthetic polymers weighing more than a few tens of kilodalton using electrospray ionization-ion mobility spectrometry-tandem mass spectrometry, in which the m/z value of the most abundant peak was used for characterization. However, the identification of the most abundant peak from the isotopic peaks was often difficult due to the background noise.

    Methods
    Here, we employed a noise reduction method using Fourier transform (FT) filtering. In the power spectrum obtained using FT of the mass spectrum of the multiple charged analytes, the significant signals in the low-frequency region and at frequency z are observed for the analytes of z charges. When the signals in both regions were used for inversed FT (i.e., the signals in other regions were zero padded), a noise-filtered mass spectrum was obtained.

    Results
    In the analysis of poly(methylmethacrylate)s weighing 13–17 kDa, mass spectra without noise filtering with relatively high-intensity noise (than signal) were complicated to identify the most abundant peak. On the contrary, the most abundant peak was clearly identified from the mass spectra after FT-based noise filtering, and end group composition was estimated successfully.

    Conclusions
    The proposed FT-based noise filtering for the mass spectrum is effective to characterize multiply charged synthetic polymers weighing more than a few tens of kilodalton using electrospray ionization-ion mobility spectrometry-tandem mass spectrometry.

  • Qualitative and quantitative analysis of mixtures of microplastics in the presence of calcium carbonate by pyrolysis-GC/MS

    Takahisa Ishimura, Itsuko Iwai, Kazuko Matsui, Marco Mattonai, Atsushi Watanabe, Wiliam Robberson, Anna-Marie Cook, Harry L.Allen, William Pipkin, Norio Teramae, Hajime Ohtani, Chuichi Watanabe

    Journal of Analytical and Applied Pyrolysis ( Elsevier )  157   105188   2021.08  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Environmental pollution by microplastics (MPs) has attracted much attention due to possible risks of MPs to human health, and fast and reliable analytical methods are required for identification and quantification of MPs in various matrices. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) has advantageous characteristics in that both identification and mass quantification can be easily done by chromatographic separation in combination with mass spectral analysis. Environmental MP samples usually contain several types of polymers and the pyrolysis of mixed polymer particles may cause a secondary reaction between pyrolyzates from different polymers. In this study, effect of the usage of calcium carbonate (CaCO3) as a catalyst on pyrolytic behavior of polymers was examined to obtain catalytic conversion of reactive pyrolyzates to stable compounds. CaCO3 was also utilized as a diluent for insoluble PE and PP powders to assure weighing easiness by forming a homogenous mixture. First, a reference material was prepared to make calibration curves by mixing twelve different types of standard polymers, selected to reflect common polymers in the global production. Identification and quantification of polymers in mixed polymer samples were validated by using model polymer mixtures, after storing Py-GC/MS data of twelve polymers with a given sample amount in a software named as F-Search MPs. Results exceeding the limit of quantitation combined with the high probability of a library match as confirmed by the software, provided assurance of the presence of the identified polymer in the model polymer mixtures. The quantitated values for the model polymer mixtures were compared with the compounded amount. The recovery varied depending on the polymer type, and especially short recovery (ca. 60–70 %) was recognized for PC in the sample from Solution A (SA) and excess recovery (ca. 175 %) for PET in the sample from Solution B (SB). Finally, the developed method was applied to the analysis of ground mixtures of isolated environmental MP particle samples and quick identification and quantification of each polymer in the MP samples were attained.

  • Evolved gas analysis-mass spectrometry in an oxidative atmosphere using a temperature-programmable furnace-type pyrolyzer

    Ai Shiono, Atsushi Watanabe, Chuichi Watanabe, Robert R. Freeman, William Pipkin, Norio Teramae, Hajime Ohtani

    Journal of Analytical and Applied Pyrolysis ( Elsevier )  156   105122   2021.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Evolved gas analysis-mass spectrometry (EGA-MS) has been used to characterize the effect of heating a material in an oxidative or non-oxidative environment. Measurements in an oxidative environment are usually done by using the mixture of air and helium (He) as the carrier gas; however, ionization efficiency of evolved gases in a mass detector (MSD) decreases in such an environment, resulting in a corresponding decrease in sensitivity. The drop in sensitivity can be reduced by diluting the air in the carrier gas with He after evolving gases from a sample and before the evolved gases flow to the MSD. This study reports on a simple modification of the gas inlet system so that experiments requiring oxidative conditions in an air atmosphere can be routinely performed without loss of the MSD sensitivity. The impact of using this modification on the data is demonstrated using polystyrene (PS) as a test sample. EGA curves were acquired in two flow configurations: (1) adding He to the carrier gas immediately after the furnace, which reduces the concentration of nitrogen and oxygen in the carrier gas; thus, minimizing the quenching of the ionization and the associated decrease in signal-to-noise ratio (S/N) and (2) the standard configuration which simply uses a mixture of He and air as the carrier gas. Data obtained using the modified method had a much high S/N than that obtained using a gas mixture (He and air or He and oxygen) as a carrier gas. The RSD (n = 5) values for the peak area and the peak temperature of the EGA curve of PS were 1.6 and 0.60 % respectively, and these values were comparable with those obtained using a He carrier gas. The modified gas inlet system was also applied to the analysis of isotactic polypropylene.

  • Preparation and test of a reference mixture of eleven polymers with deactivated inorganic diluent for microplastics analysis by pyrolysis-GC–MS

    Mai Matsueda, Marco Mattonai, Itsuko Iwai, Atsushi Watanabe, Norio Teramae, William Robberson, Hajime Ohtani, Young-Min Kim, Chuichi Watanabe

    Journal of Analytical and Applied Pyrolysis ( Elsevier )  154   104993   2021.03  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Analytical pyrolysis coupled to gas chromatography and mass spectrometry (Py-GC–MS) can provide both qualitative and quantitative data on polymer mixtures, but no standardized protocols are available yet for the application of this technique in the field of environmental microplastics analysis. In this paper, we describe the preparation of a mixture of eleven common polymers, that could be used as reference sample for microplastics analysis in environmental samples by Py-GC–MS. The mixture is obtained combining two solutions with a total of nine polymers, and a solid mixture of two polymers with an inorganic diluent. First, a set of characteristic pyrolysis products and m/z signals is proposed as markers to perform semi-quantitative calculations. Then, changes in the pyrolytic yields of characteristic products due to secondary reactions in the pyrolytic environment are systematically evaluated. The characteristic pyrolysis product of polyurethane (PU), 4,4’-diphenylmethane diisocyanate (MDI), was found to be highly susceptible to hydrolysis by the inorganic diluent, except when deactivated silica was used. Finally, the performance of the reference mixture using the silica diluent is evaluated in terms of reproducibility and linearity of response. Relative standard deviations lower than 10% and good linearity of the integrated areas (r2 > 0.96) were obtained for all polymers except PU and polyethylene terephthalate. The results show that the proposed mixture could be used in Py-GC–MS analyses of microplastics as a reliable reference material for at least nine of the eleven investigated polymers.

  • Effect of Organic Modifier on the Retention of Low-Molecular-Weight Organic Compounds in Low-Temperature HPLC Using a Liquid CO2 Mobile Phase and an Octadecyl Stationary Phase

    Kohei Matsuo, Mina Otsubo, Tomohiro Motono, Shinya Kitagawa, Yoshinori Iiguni, Hajime Ohtani

    Chromatography ( クロマトグラフィー科学会 )  42 ( 1 ) 61 - 66   2021.02  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    The retention behaviors of various low-molecular-weight compounds in low-temperature HPLC with an ODS (octadecyl silica) column and liquid CO2 mobile phase containing methanol or acetonitrile as modifiers were investigated. The addition of methanol/acetonitrile reduced the retention of xanthone, which was dominated by the liquid CO2 content, independent of the modifier. Additionally, the retention of polycyclic aromatic hydrocarbons (PAHs) was reduced by the addition of methanol/acetonitrile. Because acetonitrile resulted in a rapid reduction in the retention compared with methanol, it was suggested that the CH- interactions have an important role in the retention of PAHs in the C18 stationary phase. Notably, the retention of alkylbenzenes were only slightly affected by the addition of methanol/acetonitrile. Acetonitrile slightly increased the retention of alkylbenzenes with longer alkyl chains than those with shorter alkyl chains. It is suggested that the interaction of the phenyl moiety in alkylbenzenes with C18 chains was reduced by the increase in the acetonitrile content, and enhanced in the case of the alkyl chain moieties. The retentions of alkyl benzenes were approximately compensated, when the alkyl chain length was relatively short.

  • Ultralow-Temperature HPLC using Low-Molecular-Weight Hydrocarbons as Mobile Phases

    Tomohiro Motono, Takayuki Kanayama, Shinya Kitagawa, Yoshinori Iiguni, Hajime Ohtani

    Chromatography ( クロマトグラフィー科学会 )  41 ( 3 ) 109 - 114   2020.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    In ultralow-temperature HPLC, analyte retention is often enhanced, inhibiting elution. To solve this problem, we have investigated the use of low-molecular-weight hydrocarbons, methane and ethane, as the mobile phase in a monolithic ODS column. Analyte retention was successfully reduced by the use of these mobile phases, and elution of mono- and di-chloromethane and n-octane, which were not eluted in our previous work using a liquid nitrogen based mobile phase, was achieved. The analysis of octane structural isomers revealed that, in cryogenic HPLC, the retention of branched octanes was significantly reduced compared to the retention of n-octane, i.e., the retention factor of iso-octane (2,2,4-trimethylpentane) was almost negligible. The retention factors of branched octanes were distributed between those of n-pentane and n-heptane in HPLC at -176°C, whereas, in gas chromatography at 50°C, these values were between those of n-heptane and n-octane.

  • Characterizing chain‐end structures formed during initiation reactions of radical polymerization for MMA‐St‐BA terpolymer using pyrolysis‐gas chromatography/atmospheric pressure chemical ionization high‐resolution time‐of‐flight mass spectrometry

    Kenji Kenji Harata, Shinya Kitagawa, Yoshinori Iiguni, Hajime Ohtani, Tatsuya Ezaki

    Rapid Communication in Mass Spectrometry ( Wiley )  34 ( S2 ) e8691   2020.08  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Rationale
    Analyzing polymer end groups using pyrolysis (Py) gas chromatography/mass spectrometry (GC/MS) in multi‐component polymer samples is not an easy task because of the insufficient sensitivity, selectivity, and mass resolution of conventional Py‐GC/MS systems.

    Methods
    A new Py‐GC/MS system using an atmospheric pressure chemical ionization (APCI) source combined with high‐resolution time‐of‐flight mass spectrometry (TOFMS) was used for end‐group analysis of a methyl methacrylate (MMA)‐styrene (St)‐butyl acrylate (BA) terpolymer (P (MMA‐St‐BA)), which was radically polymerized using 2,2′‐azobis(2‐methylbutyronitrile) (AMBN) as an initiator.

    Results
    Five possible pyrolyzates, comprising an AMBN fragment and a monomer unit, formed during the initiation reactions from one of the three types of end groups, were selectively detected and exclusively identified in their respective extracted ion chromatograms for molecule‐related ions, such as M+ and [M + H]+, with a narrow mass window of ±2 milli m/z units.

    Conclusions
    It was demonstrated that Py‐APCI‐TOFMS is a powerful technique to characterize in detail the complex end groups in multi‐component polymer samples, because of the soft ionization nature of APCI and the high mass resolution of TOFMS.

  • Online fast pyrolysis of cellulose over titanium dioxide using tandem micro-reactor-GC-MS

    Hiroto Ida, Hajime Ohtani, Selhan Karagöz

    Sustainable Chemistry and Pharmacy ( Elsevier )  16   100268   2020.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    In this work, the catalytic effect of titanium dioxide (TiO2) on the online fast pyrolysis of cellulose was investigated using a tandem micro reactor coupled to a gas chromatograph-mass spectrometer (GC-MS) system. This system was used in the following two different modes: in-situ and ex-situ. The results obtained with TiO2 were compared with those of zeolite (HZSM-5) under identical pyrolysis conditions. Levoglucosan was the major product in the non-catalytic pyrolysis of cellulose. As for the catalytic pyrolysis of cellulose at 500 °C with TiO2 (in-situ), the peak of levoglucosan disappeared whereas aromatic hydrocarbons such as benzene, toluene and naphthalene were newly detected. In this case, oxygenated compounds such as furfural, furan, methylfuran were still observed for TiO2 whereas oxygenated compounds (i.e, furan, benzofuran, methylbenzofuran, acetone and 2-butanone) with low yields were observed for in-situ catalytic pyrolysis with HZSM-5. For ex-situ catalytic pyrolysis of cellulose at 500 °C using TiO2, oxygen-containing compounds were hardly formed, while various aromatic hydrocarbons were detected. When the ex-situ pyrolysis of cellulose with HZSM-5 was carried out, the yields of the aromatic hydrocarbons were comparable to those with TiO2.

  • Identification of polymer species in a complex mixture by pyrolysis-gas chromatography-atmospheric pressure chemical ionization-high resolution time-of-flight mass spectrometry as a basis for environmental microplastic analysis

    Kenji Harata, Shinya Kitagawa, Yoshinori Iiguni, Hajime Ohtani

    Journal of Analytical and Applied Pyrolysis ( Elsevier )  148   104828   2020.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Pyrolysis-gas chromatography coupled with atmospheric pressure chemical ionization-high resolution time-of-flight mass spectrometry (Py-GC-APCI-TOFMS) was applied for the reliable identification of polymer species in a complex mixture to establish this system as a platform for environmental microplastic analysis. The method was evaluated on a model sample of mixed microplastics comprised of five major polymers: polyethylene (PE), polypropylene (PP), poly(vinyl chloride) (PVC), polystyrene (PSt), and poly(ethylene terephthalate) (PET). The representative ions in the mass spectra of the pyrolyzates were identified by Py-GC-APCI-TOFMS measurements of the individual polymer species. The unique APCI ionization/fragmentation process and the high mass resolution of TOFMS were exploited to confirm the presence of the respective polymer species in the extracted ion chromatograms (EICs) of the mixed sample for the selected key ions. PE and PP were successfully and uniquely identified in the mixed sample by focusing on specific fragment ions of the pyrolyzates formed during APCI (m/z 114.093 ± 0.020 and m/z 156.139 ± 0.020, respectively). The resultant EICs allowed for the specific analysis of these species, even in the presence of interfering species produced from the other polymers. Similar processes were applied to the detection of PVC, PSt, and PET in the mixed sample. These results demonstrated that Py-GC-APCI-TOFMS is a promising tool to characterize a complex mixture of environmental microplastics.

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Books

  • Analytical Pyrolysis Handbook Third Edition

    Hajime Ohtani, Shin Tsuge (Part: Allotment Writing )

    CRC Press  2021.03 ISBN: 978-0-367-19232-7

  • Practical Gas Chromatography

    Shin TSUGE, Hajime OHTANI (Part: Allotment Writing )

    Springer  2014.12 ISBN: 978-3-642-54640-2

  • Pyrolysis-GC/MS Data Book of Synthetic Polymers

    TSUGE Shin, OHTANI Hajime, WATANABE Chuichi (Part: Multiple Authorship )

    Elsevier  2011.10 ISBN: 978-0-444-53892-5

    This data book provides an extensive reference collection of the behavior of specific polymers during pyrolysis. It fills a big gap in the available standards and data on pyrolysis research, as there are no books that give the same combination of excellent analytical data with such a wide range of polymer systems that are useful to so many areas of multidisciplinary research. The data provided will be useful whenever a new polymer has to be analyzed in order to facilitate the identification or to confirm the results. The book also briefly reviews the instrumentation available in advanced analytical pyrolysis and offers guidance to perform this technique, effectively combining gas chromatography and mass spectrometry. Main contents are comprehensive sample pyrograms, thermograms, identification tables, and representative mass spectra (MS) of pyrolyzates for synthetic polymers. This edition also highlights thermally assisted hydrolysis and methylation techniques effectively applied to 33 basic condensation polymers.

  • Recent Trends of LED-UV Curing Technology and Curing Materials, "jointly worked"

    H. Ohtani (Part: Multiple Authorship )

    CMC Publishing  2010.05 ISBN: 978-4-7813-0221-8

  • Introduction to Polymer Analysis, "jointly works"

    H. Ohtani (Part: Multiple Authorship )

    2010.04 ISBN: 978-4-06-154360-7

  • Conservation of Paper and Books

    H. Ohtnai (Part: Multiple Authorship )

    Iwata-shoin  2009.10 ISBN: 978-4-87294-574-4

  • Crosslinking and Degradation of Polymers for Sustainable Chemistry

    H. Ohtani (Part: Multiple Authorship )

    CMC Publishing  2007.07 ISBN: 978-4-88231-693-0

  • The Fifth Series of Experimental Chemistry 20-1 Analytical Chemistry, "jointly worked"

    H. Ohtani (Part: Multiple Authorship )

    Maruzen  2007.01 ISBN: 978-4-621-07319-3

  • Applied Pyrolysis Handbook second edition, "jointly worked"

    H. Ohtani, S. Tsuge (Part: Multiple Authorship ,  4. Microstructure of Polyolefins, pp.65-80; 5. Degradation Mechanism of Condensation Polymers:Polyesters and Polyamides, pp.81-103;11. Characterization of Condensation Polymers by Pyrolysis-GC in the Presence of Organic Alkali, pp.249-269 )

    CRC Press  2007.01 ISBN: 1-57444-641-X

  • Pyrolysis GC/MS of Highpolymers - Fundamentals and Pyrograms -, "jointly worked"

    S. Tsuge, H. Ohtani, C. Watanabe (Part: Multiple Authorship )

    Technosystem  2006.10 ISBN: 4-924728-51-9

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Review Papers

  • Polymer Analysis by Analytical Pyrolysis

    Journal of the Mass Spectrometry Society of Japan   68 ( 681 ) 13 - 18   2020.09  [Refereed]  [Invited]

    Introduction and explanation (scientific journal)   Single Author

  • Development of Frequency Division Multiplex LC-MS for Simultaneous Analyses

      68 ( 1 ) 13 - 18   2020.02  [Refereed]  [Invited]

    Introduction and explanation (scientific journal)   Multiple Authorship

  • Rapid Evaluation of The Weatherrability of polymers bu Xenon Lamp-Based Online Ultraviolet Irradiation-Pyrolysis-GC/MS

    Science and Industry   88 ( 1 ) 19 - 27   2014.01

    Introduction and explanation (others)   Multiple Authorship

  • Evaluation of Acidic Paper Deterioration in Library Materials by Pyrolysis-Gas Chromatography

    Hajime Ohtani

    Senri Ethnological Studies ( 国立民族学博物館 )  85   11 - 19   2013.12

    Introduction and explanation (others)   Single Author

    Pyrolysis-gas chromatography (Py-GC) was used to evaluate deteriorated acidic paper in old books. A tiny piece (ca. 0.25 mg) of deteriorated paper from each book was subjected to Py-GC measurement at a 300 °C pyrolysis temperature. Levoglucosan and its dehydrated form levoglucosenone were typical degradation products, whereas primarily only levoglucosan was observed in control samples of undamaged new paper. The relative intensity of levoglucosenone was much higher in samples taken at the heavily deteriorated marginal edge than in those taken from the center of the same page of an old book. Accordingly, levoglucosenone observed in the pyrogram can be used as a marker to evaluate the degree of deterioration of acidic paper. The formation of levoglucosenone can be attributed to the slow deterioration process of paper, in which the dehydration reaction plays an important role, accompanied by the chain scission of cellulose. The Py-GC method for paper evaluation was also applied to clarify the effect of storage conditions on the deterioration of paper materials and to evaluate the long-term deterioration of the British Parliamentary Papers (1801–1986) collected at the Kyoto University Library.

  • Direct Analysis of Stabilizers in Plastic Materials by Pyrolysis-GC and MALDI-MS

      47 ( 10 ) 336 - 344   2012.10

    Introduction and explanation (international conference proceedings)   Single Author

  • Polymer Characterization by Mass Spectrometry

    OHTANI Hajime

    Journal of Network Polymer, Japan ( Japan Thermosetting Plastic Industry Association )  32 ( 4 ) 219 - 227   2011.07

    Introduction and explanation (international conference proceedings)   Single Author

  • Ongoing study on the conservation of paper and books: evaluating paper deterioration and strengthening of deteriorated paper

    H, Sonoda, M. Seki, T. Okayama, H. Ohtani

    International Preservation News ( The International Federation of Library Associations and Institutions )  48   27 - 29   2009.08

    Introduction and explanation (international conference proceedings)   Multiple Authorship

  • Structural Characterization of UV-cured Acrylic Ester Resins by Specific Sample Decomposition

    H. Ohtani

    Journal of Network Polymer, Japan ( Japan Thermosetting Plastics Industry Association )  30 ( 1 ) 23 - 32   2009.02

    Introduction and explanation (international conference proceedings)   Single Author

Presentations

  • Identification of polymer species in mixed mcroplastic model sample by pyrolysis-gas chromatography-atmospheric pressure chemical ionization quadrupole time-of-flight mass spectrometry

    H. Ohtani, K. Harata, S. Kitagawa. Y. IIguni

    The 2020 International Chemical Congress of Pacific Basin Societies (Pacifichem 2020)  (オンライン)  2021.12  -  2021.12 

  • Analysis of microplastics ingested in individual planktons by pyrolysis-GC-MS

    Hajime Ohtani, Risa Nakano, Yuji Tanaka, Ridvan Kaan Guerses, Yasuyuki Ishida, Takashi Kimoto

    The 2020 International Chemical Congress of Pacific Basin Societies (Pacifichem 2020)  (オンライン)  2021.12  -  2021.12 

  • Analysis of synthetic polymers in electrospray ionization-ion mobility spectrometry-tandem mass spectrometry with collision induced charge stripping and Fourier transform filter

    Y. Ozeki, S. Kitagawa, H. Ohtani

    The 2020 International Chemical Congress of Pacific Basin Societies (Pacifichem 2020)  (オンライン)  2021.12  -  2021.12 

  • Frequency division multiplex HPLC-MS for simultaneous analyses of six samples

    S. Kitagawa, R. Sakita, M. Satsutani, H. Ohtani

    The 2020 International Chemical Congress of Pacific Basin Societies (Pacifichem 2020)  (オンライン)  2021.12  -  2021.12 

  • Microplastics Analysis by Pyrolysis-GC/MS-Recent Developments-

    Hajime Ohtani  [Invited]

    International Online Symposium on Environmental Microplastics  (オンライン)  2021.11  -  2021.11  SG LAB FORUM

  • Determination of microplastics ingested in plankton individuals by pyrolysis-GC-MS

    Hajime Ohtani, Risa Nakano, Yuji Tanaka, Ridvan Kaan Guerses, Yasuyuki Ishida, Takashi Kimoto  [Invited]

    International eConference on Analytical and Applied Pyrolysis  (オンライン)  2021.04  -  2021.04  ePYRO2021 organizing committee

  • Analytical Pyrolysis for Environmental Microplastic Analysis: Challenges and Solutions

    大谷 肇  [Invited]

    PyroAsia2020  (オンライン)  2020.12  -  2020.12  PyroAsia組織委員会

  • エレクトロスプレーイオン化イオンモビリティ衝突誘起解離タンデム型質量分析法によるポリブチレンテレフタレートの末端構造解析

    森本雄貴, 北川慎也, 大谷 肇, 川口邦明, 阿久津裕明

    第68回質量分析総合討論会  (オンライン)  2020.05  -  2020.05  日本質量分析学会

  • Identification of polymer species in complex mixture samples by pyrolysis-gas chromatography-atmospheric pressure chemical ionization quadrupole time-of-flight mass spectrometry (Py-APGC-MS) as a basic research for environmental microplastics

    H. Ohtani,K. Harata

    5th International Symposium on Advances in Sustainable Polymers (ASP-19)  (京都工芸繊維大学)  2019.10  -  2019.10 

  • Thermal degradation reaction of 4-vinylpyridine-divinylbenzene copolymer in acetic acid studied by pyrolysis-GC-MS and MALDI-MS

    Y. Ogawa, H. Ohtani, K. Urasaki, R. Kanai

    32nd International Symposium on Polymer Analysis and Characterization (ISPAC2019)  2019.06  -  2019.06 

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Grant-in-Aid for Scientific Research

  • Applicability of Cellulose Nanofibers for the Conservation of Paper

    Grant-in-Aid for Scientific Research(B)

    Project Year: 2015.04  -  2018.03 

 
 

Academic Activity

  • 2020.04
    -
    Now

    The Japan Society for Analytical Chemistry  

  • 2020.03
    -
    Now

    The Chemical Society of Japan  

  • 2019.05
    -
    2021.02

    The Japan Society for Analytical Chemistry  

  • 2018.06
    -
    2019.08

    Materials Life Society, Japan  

  • 2018.03
    -
    Now

    The Japan Society for Analytical Chemistry  

  • 2018.03
    -
    2020.02

    The Chemical Society of Japan  

  • 2016.04
    -
    Now

    Tha Mass Specttrometry Society of Japan  

  • 2016.03
    -
    2017.02

    The Japan Society for Analytical Chemistry  

  • 2014.04
    -
    Now

    The Japan Society for Analytical Chemistry  

  • 2014.04
    -
    2015.03

    The Japan Society for Analytical Chemistry  

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