Yoshiki Makino

Selective Continuous‐Flow Syntheses of 1,2‐Diols From Alkenes by Utilizing a Dual Functionality of Titanium Silicalite‐1 Catalyst in the Presence of Hydrogen Peroxide Without Carboxylic Acids

Yoshihiro Kon, Takuya Nakashima, Hiroki Nagashima, Yoshiki Makino et autres

Selective syntheses of 1,2‐diols from alkenes have traditionally relied on carboxylic acids and various oxidants, which often co‐produce hazardous byproducts. This report describes a simple, carboxylic‐acid‐free method to produce various aliphatic and cyclic diols from their corresponding alkenes in 51–96% isolated yields …

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A simple hydrofluoric acid-free pressurized-cavity microwave-assisted acid digestion method for determination of impurity elements in recycled carbon fibers with ICP-MS

Tetsuya Nakazato, Yoshiki Makino

A simple method was proposed for the determination of 13 impurity elements (Na, Mg, Al, K, Ca, Ti, Cr, Fe, Co, Ni, Cu, Zn, and Pb) in recycled carbon fibers (rCFs) using pressurized-cavity microwave-assisted acid digestion without hydrofluoric acid (HF) combined with …

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A case of liver schistosomiasis japonica in which abdominal ultrasound examination was the only useful diagnostic tool

Yoshiki Makino, Tetuya Kaneko

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Continuous-flow synthesis of carboxylic acids from alcohols via platinum and silicon dioxide-catalyzed hydrogen peroxide oxidation

Yoshihiro Kon, Takuya Nakashima, Yoshiki Makino, Shun‐ya Onozawa et autres

oxidation method demonstrates good reactivity for a variety of alcohols, including aliphatic, aromatic, allylic, and heteroaromatic, affording the corresponding carboxylic acids in 19-98% isolated yields with water as the sole byproduct. X-ray photoelectron spectroscopy (XPS) analysis confirmed the preservation of metallic zero-valent …

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A reaction cell as a sample introduction portal for detection of gaseous components in ICP-MS

Takafumi Hirata, Kyoko Kobayashi, Hisashi Asanuma, Yoshiki Makino et autres

The detection of gaseous elements (He, Ne, Kr, and Xe) and molecules (CO 2 , CH 4 , and NH 3 ) using inductively coupled plasma-tandem mass spectrometry (ICP-MS/MS) is described.

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Development of Organic Matrix-based Standard Samples for Quantitative Analysis of Various Trace Element by Femtosecond Laser Ablation-ICP-mass Spectrometry

Yuko TERAO, Takuro SUGIYAMA, Yasuhiko Hirana, Kaoru Iwato et autres

フェムト秒レーザーでのアブレーションによるサンプリング技術と，誘導結合プラズマ質量分析法を組み合わせた「フェムト秒レーザーアブレーション誘導結合プラズマ質量分析法」（fsLA-ICP-MS法）が，さまざまな固体試料中の主成分や微量成分の高感度，高速な分析法として注目を集めている．fsLA-ICP-MS法を用いることで，硝酸，塩酸，フッ酸などの危険な試薬を用いた煩雑な前処理を行うことなく，また，環境や実験器具による元素汚染の影響を受けることなく，超高感度な元素分析が可能である．一方で，これまでfsLA-ICP-MS法による有機マトリックス中の微量元素の定量分析に適した標準物質がなかったため，さまざまな試料中の元素濃度を正確に測定することが困難だった．この問題を克服するため，0.1〜100 mg kg−1の幅広い濃度範囲で18種類の元素を含み，有機物をマトリックスとする新たな標準試料を開発した．開発したfsLA-ICP-MS法用標準試料の詳細と，これを用いた微量分析の事例について報告する．

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Cover Picture: Continuous Synthesis of Epoxides from Alkenes by Hydrogen Peroxide with Titanium Silicalite‐1 Catalyst Using Flow Reactors (Adv. Synth. Catal. 19/2023)

Yoshihiro Kon, Takuya Nakashima, Yoshiki Makino, Hiroki Nagashima et autres

The inside cover picture of a waterfall stream illustrates the continuous synthesis of various epoxides from olefins, with hydrogen peroxide as an oxidant, catalyzed by titanium silicalite-1 (TS-1). This reaction is applicable to the epoxidation of more than 20 olefins and the …

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Continuous Synthesis of Epoxides from Alkenes by Hydrogen Peroxide with Titanium Silicalite‐1 Catalyst Using Flow Reactors

Yoshihiro Kon, Takuya Nakashima, Yoshiki Makino, Hiroki Nagashima et autres

Abstract Abstract. Continuous‐flow epoxidation of aliphatic and aromatic alkenes with hydrogen peroxide (H2O2) was carried out to give epoxides using a fixed‐bed liquid flow reactor equipped with a solid titanium silicalite‐1 (TS‐1) catalyst column. The developed flow reaction enables continuous synthesis of …

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Rapid and sensitive determination of leached platinum group elements in organic reaction solution of metal-catalyzed reactions by laser ablation-ICP-MS with spot-drying on paper

Yoshiki Makino, Hiroki Matsuo, Koichiro Masuda, Shun‐ya Onozawa et autres

A LA-ICP-MS based analytical method for the evaluation of trace PGE leaching.

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Trace Elemental Analysis by Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry

Yoshiki Makino

無機元素は顔料・インクをはじめさまざまな材料に広く用いられている。添加量の制御あるいは不純物元素の分析は製品開発や品質管理のために重要である。現在，微量元素の分析は酸・アルカリによる分解・溶液化後に原子吸光分析法，誘導結合プラズマ発光分光法，誘導結合プラズマ質量分析法にて分析する手法が用いられている。本稿では近年注目されている固体・液体試料中の無機元素を簡便に分析可能なレーザーアブレーション－誘導結合プラズマ質量分析法による分析原理・応用例を紹介する。

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Determination of trace elements in polymers using fsLA-ICP-MS with internal standardization by carbon

Yoshiki Makino, Tetsuya Nakazato

We reported the fsLA-ICP-MS analysis of 5 types of polymer CRMs including hydrocarbon-based and containing heteroatoms to demonstrate the performance of internal standardization by 13 C.

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Multi-photon fluorescence microscopy imaging of mitochondria in living cells excited by Yb-doped femtosecond fiber laser utilizing two- and three-photon competitive absorption

Hiroki Moritomo, Shinya Onishi, Yoshiki Makino, Kazuya Matsumoto et autres

By employing an Yb-doped femtosecond fiber laser oscillating at 1030 nm, multi-photon fluorescence microscopy imaging was demonstrated, utilizing competitive two- and three-photon absorption processes for excitation of the fluorescence probes. Competitive two- and three-photon absorptions occurred for all six of the fluorescence …

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