@article{pmid36001293,

title = {Novel chemically cross-linked self-molding particulate sorbents as solid-phase extraction media},

author = {Yuta Miki and Hiroya Murakami and Marin Gotoh and Tomonari Umemura and Yukihiro Esaka and Yoshinori Inoue and Norio Teshima},

doi = {10.1007/s44211-022-00179-3},

issn = {1348-2246},

year  = {2023},

date = {2023-05-01},

journal = {Anal Sci},

volume = {39},

number = {5},

pages = {749--754},

abstract = {Here, we describe novel, chemically cross-linked, self-molding particulate polymer sorbents that are utilized as a molding-type solid-phase extraction medium (M-SPEM), which exhibits high permeability and rigidness. To fabricate such M-SPEM, first, polyethyleneimine (PEI)-modified reversed-phase (RP)-type particulate sorbents were synthesized, thereafter, they were chemically cross-linked by a polymer having many epoxy groups together with additional PEI. By optimizing the binding conditions of the particulate sorbents, the resultant M-SPEM has almost the same adsorption properties as the corresponding unmolded particulate sorbent for some polar (e.g., uracil and adenine) compounds. The binding technique proposed here is expected to facilitate the fabrication of molding-type sorbents and improve the performance of the SPE procedure.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{pmid36577893,

title = {Hydrophilic interaction chromatography-type sorbent prepared by the modification of methacrylate-base resin with polyethyleneimine for solid-phase extraction of polar compounds},

author = {Hiroya Murakami and Keisuke Iida and Yuki Oda and Tomonari Umemura and Hizuru Nakajima and Yukihiro Esaka and Yoshinori Inoue and Norio Teshima},

doi = {10.1007/s44211-022-00250-z},

issn = {1348-2246},

year  = {2023},

date = {2023-03-01},

journal = {Anal Sci},

volume = {39},

number = {3},

pages = {375--381},

abstract = {Hydrophilic interaction chromatography (HILIC)-type sorbents were newly developed for the solid-phase extraction (SPE) of polar compounds. Two methacrylate-base resins with different cross-linking monomers and pore properties were synthesized, and three polyethyleneimines (PEIs) with different molecular weights were modified onto each base resin. In both cases, PEIs with a molecular weight of 10,000 (PEI-10,000) exhibited the highest adsorption properties for polar compounds (uracil, uridine, adenosine, cytidine, and guanosine). To control the water-enriched layer at the surface of the PEI-10,000-modified sorbents, the additive amount of PEI-10,000 in the modified reaction was also optimized. When 10 times the amount of PEI-10,000 to each base resin was added, an improvement in adsorption property was observed. Moreover, the use of a nonaqueous sample solution (100% acetonitrile) during the sample loading process drastically improved adsorption, especially for uracil (about 80%) and adenosine (100%). These results indicate that the formation of a strong water-enriched layer at the surface of sorbents with an effective expression of hydrophilic interaction was an important factor in the adsorption properties of polar compounds in HILIC mode-SPE.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{田中杏奈2023,

title = {アミノ酸のペンタフルオロベンジル誘導体のGC/EI-MSによる解析},

author = {田中,杏奈 and 落合,陽香 and 熊田,英峰 and 榎本,剛司 and 梅村,知也},

doi = {10.2116/bunsekikagaku.72.407},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {分析化学},

volume = {72},

number = {10.11},

pages = {407-416},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{uchida2023source,

title = {Source apportionment of black carbon aerosols by isotopes (14C and 13C) and Bayesian modeling from two remote islands in east Asian outflow region},

author = {Masao Uchida and Kanako Mantoku and Hidetoshi Kumata and Naoki Kaneyasu and Daishi Handa and Takemitsu Arakaki and Toshiyuki Kobayashi and Shiro Hatakeyama and Yasuyuki Shibata and Kimitaka Kawamura},

year  = {2023},

date = {2023-01-01},

journal = {Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms},

volume = {538},

pages = {64–74},

publisher = {Elsevier},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{pmid34996015,

title = {Development of a surface plasmon resonance sensor using an optical fiber prepared by electroless displacement gold plating and its application to immunoassay},

author = {Atsushi Shoji and Miyu Nakajima and Kazuhiro Morioka and Eiji Fujimori and Tomonari Umemura and Akio Yanagida and Akihide Hemmi and Katsumi Uchiyama and Hizuru Nakajima},

doi = {10.1016/j.talanta.2021.123162},

issn = {1873-3573},

year  = {2022},

date = {2022-04-01},

journal = {Talanta},

volume = {240},

pages = {123162},

abstract = {A simple and low-cost method of fabricating an optical fiber for a surface plasmon resonance (SPR) sensor was proposed. The method is based on the electroless nickel plating and subsequent displacement gold plating of the core of the optical fiber. The thickness of the nickel and gold thin films deposited on the core of the optical fiber could be controlled by measuring the reflected light intensity from the tip of the optical fiber during the plating processes. The sensitivity and resolution of the SPR sensor with the fabricated optical fiber in the refractive index range from 1.333 to 1.348 were 1324.3 nm/RIU and 7.6 × 10 RIU, respectively. The developed SPR sensor was successfully used in the determination of immunoglobulin A (IgA) in human saliva. The IgA quantification results obtained by the SPR sensor were in excellent agreement with those obtained by conventional enzyme-linked immunosorbent assay using a 96-well microtiter plate.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{pmid35314976,

title = {Preparation and evaluation of molding-type solid-phase extraction media binding with commercially available adhesives},

author = {Yuta Miki and Hiroya Murakami and Keisuke Iida and Tomonari Umemura and Yukihiro Esaka and Yoshinori Inoue and Norio Teshima},

doi = {10.2116/analsci.21P265},

issn = {1348-2246},

year  = {2022},

date = {2022-02-01},

journal = {Anal Sci},

volume = {38},

number = {2},

pages = {307--315},

abstract = {A fabrication method of molding-type solid-phase extraction media (M-SPEM) bound with commercially available adhesive is presented. Six pieces of M-SPEM were prepared by heating each kneaded product of a particulate sorbent and an adhesive inserted into a six-hole cylindrical mold for hardening under an open system and normal pressure. The particulate sorbent contained in M-SPEM was divinylbenzene-based reversed-phase mode solid-phase extractants that we have reported. An examination of several adhesives showed that the moldability of M-SPEM depended on the composition and properties of the adhesive. The optimized procedure can be used to prepare an M-SPEM containing an 85 wt% particulate sorbent (particulate sorbent/adhesive, 100 mg/17 mg; particle diameter, 90-150 µm), and the M-SPEM has a specific surface area of about 500 m/g. The established procedure in this study can bind particulate sorbents together, which showed almost no reductions in the adsorption property and liquid permeability compared with those of the particulate sorbent.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{article,

title = {Development of Portable Fluorescence Microplate Reader Equipped with Indium Tin Oxide Glass Heater for Loop-mediated Isothermal Amplification},

author = {Ryo Ishii and Kazuhiro Morioka and Takuya Mizumoto and Natsumi Yamasaki and Akihide Hemmi and Atsushi Shoji and Hiroya Murakami and Norio Teshima and Tomonari Umemura and Katsumi Uchiyama and Hizuru Nakajima},

doi = {10.18494/SAM.2022.3618},

year  = {2022},

date = {2022-01-01},

journal = {Sensors and Materials},

volume = {34},

pages = {1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}