Article
Multidisciplinary Sciences
Jing-Hang Wu, Fei Chen, Tian-Hao Yang, Han-Qing Yu
Summary: This study introduces a comprehensive kinetic examination method for spin-trapping EPR analysis to monitor the concentration of singlet oxygen (O-1(2)). It can avoid false-positive results and provide insights into the reaction mechanisms in catalytic oxidation processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Alberto Hernandez-Minguez, Alexander Poshakinskiy, Michael Hollenbach, Paulo Santos, Georgy Astakhov
Summary: This study demonstrates a new method of acoustic manipulation of spin qubits, showing a significant interaction between surface acoustic waves and the excited-state spin of silicon vacancies, which leads to more coherent spin control. By simultaneously driving spins in the ground and excited states with the same surface acoustic wave, the spins can be trapped along a specific direction. This coherent acoustic manipulation of spins in different states opens up new opportunities for on-chip quantum information protocols and coherent sensing.
Article
Chemistry, Applied
Joaquin Velasco, Mogens L. Andersen, Leif H. Skibsted
Summary: ESR spin trapping can be useful for evaluating the oxidative susceptibility of dried microencapsulated oils (DMOs), but caution is needed in interpreting the data due to the complexity of reactions involved. Availability of oxygen can impact the rates of spin trapping and spin-adduct quenching, affecting the levels of radicals observed. Understanding the kinetics of oxidation, spin trapping, and spin-adduct decay in bulk oils is crucial for accurate data interpretation in DMOs.
Article
Agricultural Engineering
Wichittra Arai, Hiromi Kameya, Rokiah Hashim, Othman Sulaiman, Takamitsu Arai, Kumar Sudesh, Ishak Mohd Yusuff, Suhaida Mat Ghani, Ahmad Hazri Ab Rashid, Akihiko Kosugi
Summary: Oil palm waste is a potential source of renewable energy and bioactive compounds. In this study, the ROS scavenging capacity of oil palm trunk sap (OPTS) was analyzed, and it was found that OPTS from different parts of the trunk stored for different times exhibited varying levels of scavenging capacity for reactive oxygen species.
INDUSTRIAL CROPS AND PRODUCTS
(2022)
Article
Polymer Science
Thu Anh Nguyen, Shota Ichise, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Satoko Okubayashi
Summary: The thermal degradation mechanism of poly(propylene) fabric was analyzed using the electron spin resonance (ESR) spin-trapping technique. The results showed that the degradation of poly(propylene) starts from the tertiary carbon positions and involves various pathways of radical formation, which further participate in the degradation process of poly(propylene).
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Tomoki Hayashi, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Ayaka Fujii, Seisuke Inada, Hiroshi Yamamoto
Summary: Spin-trapping ESR and GPC analyses were used to study the thermal degradation mechanisms of PVA, revealing the production of radical intermediates and the occurrence of cross-linking reactions at temperatures above 100°C. Main chain scission was also observed significantly around 200°C, indicating the importance of the elimination of .OH in PVA degradation.
Article
Chemistry, Analytical
Qingqing Miao, Wan Chen, Yue Jiang, Min Zhao, Yi An, Yuan Zhang, Li Yang
Summary: In this study, a new and facile D2O sensor based on singlet oxygen (1O2)-relevant afterglow luminescence of chlorin e4 nanoparticles (Ce4-NPs) was reported for distinguishable detection between D2O and H2O. The 1O2 displays a much longer lifetime in D2O compared to H2O and generates more dioxetane intermediates, leading to enhanced afterglow brightness of Ce4-NPs in D2O. Ce4-NPs can also quantitatively detect the amount of H2O in D2O with a detection limit of 1.45%.
ANALYTICAL CHEMISTRY
(2023)
Article
Biophysics
Saranya Thiruvottriyur Shanmugam, Stanislav Trashin, Karolien De Wael
Summary: The study developed a photoelectrochemical method for DNA detection, evaluating different photosensitizers under specific laser wavelengths and successfully achieving photocurrent detection of DNA under certain conditions. By using magnetic beads and DNA probes labeled with specific photosensitizers, sensitive and robust detection of complementary DNA targets was achieved.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Food Science & Technology
Tomomi Kanno, Shigeaki Nakazawa, Etsuko Harada, Hiromi Kameya, Yoshiaki Miyake, Kazunobu Sato, Takeji Takui, Toshihiko Osawa
Summary: This study used ESR to analyze radical species in different parts of mushrooms and examined their hydroxyl radical scavenging activities. The results showed that different parts of mushrooms contain different metal ions, and different parts of mushrooms exhibit varied hydroxyl radical scavenging activities.
FOOD SCIENCE AND TECHNOLOGY RESEARCH
(2021)
Review
Chemistry, Inorganic & Nuclear
Suman Joseph, S. K. Ashok Kumar
Summary: Singlet oxygen (1O2) plays an important role in chemistry, medicine, and human physiology, but its use in biological systems is limited due to a lack of efficient probes. This review discusses the current developments of probes and molecular carriers of 1O2, which typically consist of a 1O2-specific binding unit and a signaling unit. Based on the signaling mode, these probes can be categorized into absorption-based, colorimetric, photoluminescent, and chemiluminescent. The review also highlights the factors affecting their efficiency and identifies unexplored areas for potential future developments.
COORDINATION CHEMISTRY REVIEWS
(2023)
Review
Chemistry, Inorganic & Nuclear
Manabu Nakaya, Ryo Ohtani, Leonard F. Lindoy, Shinya Hayami
Summary: This review provides an overview of reported examples of SCO iron(III) systems that exhibit the LIESST effect, which is crucial for understanding the excited states and spin state transitions in iron(III) complexes.
INORGANIC CHEMISTRY FRONTIERS
(2021)
Article
Polymer Science
Thu Anh Nguyen, Hui Ming Lim, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi, Satoko Okubayashi, Satoru Hosoda, Tetsu Sato
Summary: The purpose of this study is to investigate the thermo-oxidative degradation behavior of polypropylene (PP) by comparing three types of pristine PP granules with their corresponding oxidized analogues. The degrees of oxidation were evaluated using chemiluminescence intensity. In the pristine PP samples, a small amount of hydroperoxides were unintentionally formed, while in the oxidized PP granules, the higher hydroperoxide concentration led to two-stage cage reactions and bimolecular decomposition.
Article
Polymer Science
Akihiro Kurima, Kenji Kinashi, Wataru Sakai, Naoto Tsutsumi
Summary: This study investigated the mechanisms of thermal degradation of polyamide 66 (PA66) under a vacuum at temperatures ranging from 80°C to 240°C. It was found that there was no significant weight loss or signs of degradation at this temperature range under oxygen-free conditions. However, slight production of secondary amine groups was observed. The analysis revealed the presence of two intermediate radicals generated during the thermal degradation process.
Article
Food Science & Technology
Hafida Wahia, Long Zhang, Cunshan Zhou, Abdullateef Taiye Mustapha, Olugbenga Abiola Fakayode, Robert Amanor-Atiemoh, Haile Ma, Mokhtar Dabbour
Summary: This study investigated the effectiveness of pulsed multifrequency ultrasound in minimizing Alicyclobacillus acidoterrestris (AAT) spores and vegetative cells. It was found that dual-frequency thermosonication and ultrasonication significantly reduced AAT bacteria, with dual-frequency thermosonication exhibiting higher bactericidal efficacy. Microscopic analysis revealed ultra-structural modifications induced by sonoporation. Fourier-transform infrared spectroscopy showed major changes in the membrane fatty acids and proteins of AAT. The results suggested that pulsed multifrequency ultrasound can be an alternative to mono-frequency ultrasound in the beverage industry.
FOOD RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Inorganic & Nuclear
Cao-Ming Yu, Xian Zhang, Yong-Qin Wei, Li-Zhen Cai, Ming-Sheng Wang, Guo-Cong Guo
Summary: This study presents a new photochromic coordination compound with selective O-3(2) detection ability, which undergoes photoinduced formation of a stable diradical-like triplet species, leading to color change for oxygen detection.
INORGANIC CHEMISTRY
(2022)
Article
Multidisciplinary Sciences
Hiromi Kurokawa, Hidehiro Ito, Mai Inoue, Kenji Tabata, Yoshifumi Sato, Kazuya Yamagata, Shinae Kizaka-Kondoh, Tetsuya Kadonosono, Shigenobu Yano, Masahiro Inoue, Toshiaki Kamachi
SCIENTIFIC REPORTS
(2015)
Article
Chemistry, Multidisciplinary
Tetsuya Haruyama, Takamitsu Namise, Naoya Shimoshimizu, Shintaro Uemura, Yoshiyuki Takatsuji, Mutsuki Hino, Ryota Yamasaki, Toshiaki Kamachi, Masahiro Kohno
Article
Food Science & Technology
Mana Tsukada, Hong Sheng, Toshiaki Kamachi, Yoshimi Niwano
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
(2016)
Article
Multidisciplinary Sciences
Mana Tsukada, Takuji Nakashima, Toshiaki Kamachi, Yoshimi Niwano
Article
Biochemical Research Methods
Toshihiro Kobayashi, Yuriko Matsumura, Toshihiko Ozawa, Hiroyuki Yanai, Atsuo Iwasawa, Toshiaki Kamachi, Kouichi Fujiwara, Noriaki Tanaka, Masahiro Kohno
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2014)
Article
Biochemistry & Molecular Biology
Hidehiro Ito, Ryuichi Kondo, Kosei Yoshimori, Toshiaki Kamachi
Article
Multidisciplinary Sciences
Hidefumi Uchiyama, Qing-Li Zhao, Mariame Ali Hassan, Gabor Andocs, Nobuyuki Nojima, Keigo Takeda, Kenji Ishikawa, Masaru Hori, Takashi Kondo
Article
Food Science & Technology
Ryota Hosomi, Ayano Nishimoto, Toshihiro Kobayashi, Yuki Ikeda, Megumi Mitsui, Takaki Shimono, Seiji Kanda, Toshimasa Nishiyama, Munehiro Yoshida, Kenji Fukunaga
JOURNAL OF FOOD SCIENCE
(2020)
Article
Microbiology
Hidehiro Ito, Kosei Yoshimori, Masahito Ishikawa, Katsutoshi Hori, Toshiaki Kamachi
Summary: In this study, a methanol production system was established using methanotroph mutants to control the expression of methanol dehydrogenase (MDH), allowing for methanol accumulation. By modulating the metal ion composition, the conditions for cell growth inhibition and methanol accumulation were repeatedly alternated, showcasing the potential for efficient conversion of methane to methanol.
FRONTIERS IN MICROBIOLOGY
(2021)
Article
Multidisciplinary Sciences
Hiroyuki Kawata, Masahiro Kohno, Kohei Nukina, Isanori Horiuchi, Hisataka Goda, Tomomi Kuwahara, Kosei Yoshimori, Akimitsu Miyaji, Toshiaki Kamachi, Toshikazu Yoshikawa
Summary: This study identified the chloroperoxyl radical as the active species in acidic sodium chlorite using ESR spectroscopy and demonstrated the feasibility of quantifying it with the DPD method. The chloroperoxyl radical showed high thermodynamic stability and had a linear relationship between its UV-visible absorbance at 354 nm and the ESR signal intensity. Quantifying the free chlorine concentration with the DPD method also showed a linear relationship with the absorbance and ESR signal intensity, suggesting the potential for quantifying the chloroperoxyl radical as the active species in ASC aqueous solution.
Article
Multidisciplinary Sciences
Masahiro Kohno, Toshiaki Kamachi, Koji Fukui
Summary: This study investigated the states of oxygen, nitrogen, and hydrogen dissolved in water using experimental trials and theoretical calculations. The results showed that the Earth's magnetic field is involved in the bonding and dissociation of molecules at the gas-liquid interface, and molecular interactions caused by electromagnetic properties and the external geomagnetic field affect intermolar bonding.
Article
Multidisciplinary Sciences
Zhen Lei, Mizuki Endo, Hitoshi Ube, Takafumi Shiraogawa, Pei Zhao, Koichi Nagata, Xiao-Li Pei, Tomoya Eguchi, Toshiaki Kamachi, Masahiro Ehara, Takeaki Ozawa, Mitsuhiko Shionoya
Summary: Photoluminescent gold clusters with unique chemical and physical properties based on the perturbed electronic structures have been synthesized using N-heterocyclic carbene ligands.
NATURE COMMUNICATIONS
(2022)
Article
Biotechnology & Applied Microbiology
Wataru Shiina, Hidehiro Ito, Toshiaki Kamachi
Summary: In this study, a lanthanide transporter was identified in Methylosinus trichosporium OB3b, and a potential interaction between intracellular lanthanide and glycerol was indicated. Understanding the genetic and environmental factors affecting lanthanide uptake should not only help improve the use of lanthanides for the bioconversion of methane into valuable products like methanol but also be of value for developing biomining to extract lanthanides under neutral conditions.
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
(2023)
Article
Chemistry, Physical
Kenya Tanaka, Masahiro Kaneko, Masahito Ishikawa, Souichiro Kato, Hidehiro Ito, Toshiaki Kamachi, Kazuhide Kamiya, Shuji Nakanishi
Article
Biology
Mana Tsukada, Hong Sheng, Mika Tada, Takayuki Mokudai, Satomi Oizumi, Toshiaki Kamachi, Yoshimi Niwano
BIOCONTROL SCIENCE
(2016)
