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Zhang Z, Guo H, Hirai Y, Takeda K, Asai C, Takamura N, Niwa O. A Novel Polyurethane-Based Polyion Complex Material with Tunable Selectivity against Interferents for Selective Dopamine Determination. Biosensors (Basel) 2023; 13:638. [PMID: 37367003 DOI: 10.3390/bios13060638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/06/2023] [Accepted: 06/06/2023] [Indexed: 06/28/2023]
Abstract
Polyion complex (PIC) materials have been widely used in biosensors due to their molecular selectivity. However, achieving both widely controllable molecular selectivity and long-term solution stability with traditional PIC materials has been challenging due to the different molecular structures of polycations (poly-C) and polyanions (poly-A). To address this issue, we propose a novel polyurethane (PU)-based PIC material in which the main chains of both poly-A and poly-C are composed of PU structures. In this study, we electrochemically detect dopamine (DA) as the analyte and L-ascorbic acid (AA) and uric acid (UA) as the interferents to evaluate the selective property of our material. The results show that AA and UA are significantly eliminated, while DA can be detected with a high sensitivity and selectivity. Moreover, we successfully tune the sensitivity and selectivity by changing the poly-A and poly-C ratios and adding nonionic polyurethane. These excellent results were employed in the development of a highly selective DA biosensor with a detection range from 500 nM to 100 μM and a 3.4 μM detection limit. Overall, our novel PIC-modified electrode has the potential to advance biosensing technologies for molecular detection.
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Affiliation(s)
- Zixin Zhang
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690, Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Hongchen Guo
- Department of Life Science and Green Chemistry, Graduate School of Engineering, Saitama Institute of Technology, 1690, Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Yuugo Hirai
- Department of Life Science and Green Chemistry, Graduate School of Engineering, Saitama Institute of Technology, 1690, Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Katsunori Takeda
- R&D Headquarters, DKS Co., Ltd., 5 Ogawara, Kisshoin, Minami, Kyoto 601-8391, Japan
| | - Chiho Asai
- R&D Headquarters, DKS Co., Ltd., 5 Ogawara, Kisshoin, Minami, Kyoto 601-8391, Japan
| | - Naohiro Takamura
- R&D Headquarters, DKS Co., Ltd., 5 Ogawara, Kisshoin, Minami, Kyoto 601-8391, Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690, Fusaiji, Fukaya, Saitama 369-0293, Japan
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Nakao K, Noda K, Hashimoto H, Nakagawa M, Nishimi T, Ohira A, Sato Y, Kato D, Kamata T, Niwa O, Kunitake M. Electrochemistry in bicontinuous microemulsions derived from two immiscible electrolyte solutions for a membrane-free redox flow battery. J Colloid Interface Sci 2023; 641:348-358. [PMID: 36940591 DOI: 10.1016/j.jcis.2023.03.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 03/04/2023] [Accepted: 03/09/2023] [Indexed: 03/16/2023]
Abstract
HYPOTHESES Bicontinuous microemulsions (BMEs) have attracted attention as unique heterogeneous mixture for electrochemistry. An interface between two immiscible electrolyte solutions (ITIES) is an electrochemical system that straddles the interface between a saline and an organic solvent with a lipophilic electrolyte. Although most BMEs have been reported with nonpolar oils, such as toluene and fatty acids, it should be possible to construct a sponge-like three-dimensionally expanded ITIES comprising a BME phase. EXPERIMENTS Dichloromethane (DCM)-water microemulsions stabilized by a surfactant were investigated in terms of the concentrations of co-surfactants and hydrophilic/lipophilic salts. A Winsor III microemulsion three-layer system, consisting of an upper saline phase, a middle BME phase, and a lower DCM phase, was prepared, and electrochemistry was conducted in each phase. FINDINGS We found the conditions for ITIES-BME phases. Regardless of where the three electrodes were placed in the macroscopically heterogeneous three-layer system, electrochemistry was possible, as in a homogeneous electrolyte solution. This indicates that the anodic and cathodic reactions can be divided into two immiscible solution phases. A redox flow battery comprising a three-layer system with a BME as the middle phase was demonstrated, paving the way for applications such as electrolysis synthesis and secondary batteries.
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Affiliation(s)
- Kodai Nakao
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan; Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Koji Noda
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Hinako Hashimoto
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Mayuki Nakagawa
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Taisei Nishimi
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Room 422, Bldg. 12, Faculty of Engineering, The University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Akihiro Ohira
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yukari Sato
- Research Institute for Energy Conservation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Dai Kato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Tomoyuki Kamata
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Masashi Kunitake
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan; Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan.
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Nagai H, Shimada T, Takahashi Y, Nishikawa M, Tozuka H, Yamamoto Y, Niwa O, Takahara Y, Fujita A, Nagase K, Kasahara K, Yano S, Sai Y. Evaluation of factors affecting epidermal growth factor receptor tyrosine kinase inhibitor-induced hepatotoxicity in Japanese patients with non-small cell lung cancer: a two-center retrospective study. J Pharm Health Care Sci 2022; 8:28. [DOI: 10.1186/s40780-022-00258-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 09/28/2022] [Indexed: 12/02/2022] Open
Abstract
Abstract
Background
Gefitinib and erlotinib, are epidermal growth factor receptor tyrosine kinase inhibitors, and are currently recommended for non-small cell lung cancer stage IV in the elderly and in patients with decreased performance status in the Japanese Lung Cancer Society Guideline, but they occasionally caused severe hepatotoxicity requiring postponement or modification of treatment. However, little is known about the risk factors for hepatotoxicity in patients receiving gefitinib and erlotinib. In this study, we investigated the factors influencing hepatotoxicity in Japanese non-small cell lung cancer (NSCLC) patients treated with gefitinib or erlotinib monotherapy.
Methods
Japanese patients with NSCLC who started gefitinib or erlotinib monotherapy from January 2005 to December 2017 at Kanazawa University Hospital or Kanazawa Medical University Hospital were included in this study. Factors affecting hepatotoxicity were retrospectively investigated by multiple logistic regression analysis.
Results
A total of 102 patients who received gefitinib and 95 patients who received erlotinib were included in the analysis. In the gefitinib group, a body mass index (BMI) ≥ 25 was associated with an increased risk of hepatotoxicity (OR = 4.571, 95% CI = 1.486–14.056, P = 0.008). In the erlotinib group, concomitant use of acid-suppressing medications (AS), namely proton pump inhibitors or histamine-2 receptor antagonists, was associated with a reduced risk of hepatotoxicity (OR = 0.341, 95% CI = 0.129–0.900, P = 0.030).
Conclusions
BMI ≥ 25 in patients treated with gefitinib increased the risk of hepatotoxicity. In contrast, AS combination with erlotinib reduced the risk of hepatotoxicity. Thus, because different factors influence the risk of hepatotoxicity, monitoring for adverse events should take into account patient background factors and concomitant medications.
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Shiba S, Yoshimoto S, Hashiguchi S, Kunitake M, Kato D, Niwa O, Matsuguchi M. Porous gold nanomesh films electrodeposited in toluene-based dynamic soft template. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Shiba S, Koike A, Takahashi S, Kato D, Kamata T, Niwa O. Vertically Oriented Metallic Heterodimer Array Semiembedded in Flat Conductive Carbon Film for Electrochemical Application. ACS Nano 2022; 16:10589-10599. [PMID: 35758937 DOI: 10.1021/acsnano.2c02157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
General synthesis of a highly oriented metallic heterodimer array based on a selective electrodeposition technique onto a metal nanoparticle-embedded carbon film is proposed, which enables the preparation of heterodimers with a wide variety of metal combinations. This method requires no surfactant, capping agent, organic solvent, or heat treatment. As a representative metal combination, a nickel (Ni)/palladium (Pd) heterodimer array was prepared by selective electrodeposition of Ni nanoparticles (Ni NPs) on top of partially exposed Pd NPs embedded in carbon film electrodes fabricated by a cosputtering technique. Such a selective electrodeposition becomes possible by utilizing the difference in electrodeposition overpotentials between carbon and Pd NP surfaces. X-ray photoelectron spectroscopy revealed a charge transfer from Ni NPs to Pd NPs, implying that the catalytic and optical properties can be expected to be controllable. The formed heterodimer array structure was mechanically stable against ultrasonication in ethanol for over 1 h because most parts of the Pd NPs were tightly embedded in the carbon film. After conversion from Ni to nickel hydroxide (Ni(OH)2), the electrode showed high electrocatalytic activity toward glucose oxidation, with a higher turnover rate and lower overpotential compared to Ni(OH)2 electrodeposited on pure carbon film electrodes.
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Affiliation(s)
- Shunsuke Shiba
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Bunkyo-cho 3, Matsuyama, Ehime 790-8577, Japan
| | - Ayaka Koike
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Shota Takahashi
- Department of Life Science and Green Chemistry, Faculty of Engineering, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Dai Kato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Tomoyuki Kamata
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
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Narafu S, Takashima Y, Niwa O, Yajima T, Ueno Y. Electrochemical analysis of ferrocene in bicontinuous microemulsions using β- cyclodextrin modified monolayer graphene electrodes. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Tango R, Koeda A, Nagamine K, Tokito S, Niwa O, Ishikawa S, Sugimoto M. Development of a highly sensitive Prussian-blue-based enzymatic biosensor for L-carnitine employing the thiol/disulfide exchange reaction. ANAL SCI 2022; 38:963-968. [PMID: 35578012 DOI: 10.1007/s44211-022-00122-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 04/23/2022] [Indexed: 11/01/2022]
Abstract
This is the first report of conducting proof-of-concept study for amperometric acetyltransferase-based L-carnitine sensor by employing the thiol/disulfide exchange reaction. The carnitine acetyltransferase (CrAT) catalyzes the reaction between acetyl-CoA and L-carnitine to produce CoA which is difficult to detect directly by electrochemical methods owing to steric hindrance and electrostatic effect of CoA. The thiol/disulfide exchange reaction between CoA and cystamine was mediated in the enzymatic reaction to produce electrochemically detectable low molecular weight of cationic cysteamine. The sensor exhibited high sensitivity and selectivity for L-carnitine in the concentration range 0.28-50 µM with a limit of detection of 0.28 µM. This is a promising strategy for L-carnitine sensing in point-of-care testing applications.
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Affiliation(s)
- Ryota Tango
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa, 992-8510, Yamagata, Japan
| | - Aya Koeda
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa, 992-8510, Yamagata, Japan
| | - Kuniaki Nagamine
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa, 992-8510, Yamagata, Japan.
| | - Shizuo Tokito
- Graduate School of Organic Materials Science, Yamagata University, 4-3-16, Jonan, Yonezawa, 992-8510, Yamagata, Japan
| | - Osamu Niwa
- Saitama Institute of Technology, 1690, Fusaiji, Fukaya, 369-0293, Saitama, Japan
| | - Shigeo Ishikawa
- Department of Dentistry, Oral and Maxillofacial Plastic and Reconstructive Surgery, Faculty of Medicine, Yamagata University, 2-2-2, lida-nishi, Yamagata, 990-9585, Japan
| | - Masahiro Sugimoto
- Research and Development Center for Minimally Invasive Therapies, Institute of Medical Science, Tokyo Medical University, 6-1-1, Shinjuku, Tokyo, 160-0023, Japan
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Kato S, Terada N, Niwa O, Yamada M. Response to: Risk Factors Affecting Cage Retropulsion into the Spinal Canal Following Posterior Lumbar Interbody Fusion: Association with Diffuse Idiopathic Skeletal Hyperostosis. Asian Spine J 2022; 16:309-310. [PMID: 35508943 PMCID: PMC9066248 DOI: 10.31616/asj.2022.0089.r2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2022] [Accepted: 03/23/2022] [Indexed: 11/23/2022] Open
Affiliation(s)
- Shinichi Kato
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
- Corresponding author: Shinichi Kato Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, 3-6-10 Otobashi, Nakagawa-ku, Nagoya, Aichi 454-8509, Japan Tel: +81-52-323-5650, Fax: +81-52-332-8634, E-mail:
| | - Nobuki Terada
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Osamu Niwa
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Mitsuko Yamada
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
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Kato S, Terada N, Niwa O, Yamada M. Factors Affecting Incomplete L5/S Posterior Lumbar Interbody Fusion, Including Spinopelvic Sagittal Parameters. Asian Spine J 2021; 16:526-533. [PMID: 34470098 PMCID: PMC9441434 DOI: 10.31616/asj.2021.0064] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 06/01/2021] [Indexed: 11/23/2022] Open
Abstract
Study Design Retrospective observational study. Purpose In this study we identify risk factors, including patient demographics, sagittal parameters, and clinical examinations, affecting incomplete L5/S posterior lumbar interbody fusion (PLIF). Overview of Literature The lumbosacral spine is considered to have an interbody fusion rate lower than that of the lumbar spine, but few studies have investigated the cause, including investigating the pelvis. We believe that pelvic morphology can affect L5/S interbody fusion of the lumbosacral spine. Methods We observed 141 patients (61 men, 80 women; average age, 65.8 years) who had undergone PLIF and checked for the presence of L5/S interbody fusion. We investigated factors such as age, gender, the presence of diffuse idiopathic skeletal hyperostosis (DISH), fusion level, and grade 2 osteotomy, as well as pre-, post-, and post-preoperative L5/S disk height and angle, lumbar lordosis, Visual Analog Scale (VAS) score, Japanese Orthopaedic Association (JOA) score, and pelvic incidence (PI), comparing those with and without L5/S interbody fusion. In addition, we analyzed the patients classified into short-level (n=111) and multi-level fusion groups (n=30). Results Overall, the L5/S interbody fusion rate was 70% (short-level, 78%; multi-level, 40%). Age and pre- and post-preoperative L5/S disk angle were significantly different in each fusion level group. DISH presence, grade 2 osteotomy, and postoperative VAS and JOA scores were significantly different in the short-level fusion group, whereas PI was significantly different in the multi-level fusion group. Conclusions Incomplete union after L5/S PLIF correlates with advanced age, many fusion levels, and a large value of preoperative and a small value of post-preoperative L5/S disk angles.
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Affiliation(s)
- Shinichi Kato
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Nobuki Terada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Osamu Niwa
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Mitsuko Yamada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
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Li J, Xue Q, Chen T, Liu F, Wang Q, Chang C, Lu X, Zhou T, Niwa O. The influence mechanism of the molecular structure on the peak current and peak potential in electrochemical detection of typical quinolone antibiotics. Phys Chem Chem Phys 2021; 23:13873-13877. [PMID: 34110338 DOI: 10.1039/d1cp01358k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Antibiotic pollution in water has become an increasingly serious problem, posing a potentially huge threat to human health. Ofloxacin (OFL), norfloxacin (NOR), and enoxacin (ENX) are typical broad-spectrum quinolone antibiotics, which are frequently detected in various water environments. An electrochemical sensor is a rapid and effective tool to detect antibiotics in the aquatic environment. The molecular structure of target pollutants is an important factor affecting the detection performance of electrochemical sensors. Based on the electrochemical detection results of antibiotics (OFL, NOR, and ENX), we first used the molecular structure analysis method based on quantum chemistry to accurately identify the electronegativity and the electrocatalytic degree of the oxidizable (and non-oxidizable) functional groups of pollutants. We also clarified the influence mechanism of the molecular structure on the peak current and peak potential. These results can provide theoretical support for rapidly selecting electrodes with a suitable electrochemical window to efficiently detect trace organic pollutants (such as antibiotics) in water based on the molecular structure of the target pollutant.
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Affiliation(s)
- Jiawei Li
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Aerospace Seahawk Electromechanical Technology Research Institute Co., Ltd, 100074, Beijing, China and Beijing Jinghang Institute of Computing and Communication, 100074, China
| | - Qiang Xue
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Beijing Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Tao Chen
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Beijing Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Fei Liu
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Beijing Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Qun Wang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Beijing Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Chunwen Chang
- MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, China University of Geosciences (Beijing), Beijing 100083, P. R. China. and Beijing Key Laboratory of Water Resources and Environmental Engineering, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, P. R. China
| | - Xiaohua Lu
- National Institute of Metrology, No. 18, Bei San Huan Dong Lu, 100022 Beijing, China
| | - Taogeng Zhou
- Beijing Institute of Technology, No. 5, South Zhongguancun Street, 100081 Beijing, China
| | - Osamu Niwa
- Saitama Institute of Technology, 1690, Fusaiji, Fukaya, Saitama 369-0293, Japan
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Abstract
Surface modification is recognized as one of the fundamental techniques to fabricate biosensing interfaces. This review focuses on the surface modification of carbon substrates (GC and HOPG) and silica with a close-packed monolayer, in particular. In the cases of carbon substrates, GC and HOPG, it was demonstrated that surface modification of carbon substrates with diazonium derivatives could create a close-packed monolayer similar to the self-assembled monolayer (SAM) formation with mercapto derivatives. Similarly, the potential of trialkoxysilanes to form a close-packed monolayer was evaluated, and modification with a close-packed monolayer tended to occur under milder conditions when the trialkoxysilanes had a longer alkyl chain. In these studies, we synthesized surface modification materials having ferrocene as a redox active moiety to explore features of the modified surfaces by an electrochemical method using cyclic voltammetry, where surface concentrations of immobilized molecules and blocking effect were studied to obtain insight for density leading to a close-packed layer. Based on those findings, fabrication of a biosensing interface on the silica sensing chip of the waveguide-mode sensor was carried out using triethoxysilane derivatives bearing succinimide ester and oligoethylene glycol moieties to immobilize antibodies and to suppress nonspecific adsorption of proteins, respectively. The results demonstrate that the waveguide-mode sensor powered by the biosensing interface fabricated with those triethoxysilane derivatives and antibody has the potential to detect several tens ng/mL of biomarkers in human serum with unlabeled detection method.
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Affiliation(s)
- Mutsuo Tanaka
- Department of Life Science & Green Chemistry, Saitama Institute of Technology
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology
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Shiba S, Ohta S, Ohtani K, Takahashi S, Kato D, Niwa O. Supporting effects of a N-doped carbon film electrode on an electrodeposited Ni@Ni(OH) 2 core-shell nanocatalyst in accelerating electrocatalytic oxidation of oligosaccharides. RSC Adv 2021; 11:13311-13315. [PMID: 35423851 PMCID: PMC8697587 DOI: 10.1039/d1ra01157j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 03/31/2021] [Indexed: 12/16/2022] Open
Abstract
The supporting effect of a N-doped carbon film induced superior crystallinity in electrodeposited Ni@Ni(OH)2 core-shell nanoparticles. This improvement resulted in a much higher regeneration rate of catalytic sites (NiOOH), leading to higher oxidation currents of sugars. Also, the overpotential of the maltopentaose (G5) oxidation reaction decreased significantly, probably due to the effect of the electrostatic interaction between NPs and G5.
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Affiliation(s)
- Shunsuke Shiba
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University 3 Bunkyo-cho Matsuyama Ehime 790-8577 Japan
| | - Saki Ohta
- Advanced Science Research Laboratory, Saitama Institute of Technology 1690 Fusaiji, Fukaya Saitama 369-0293 Japan +81-48-585-6896 +81-48-585-6304
| | - Kazuya Ohtani
- Advanced Science Research Laboratory, Saitama Institute of Technology 1690 Fusaiji, Fukaya Saitama 369-0293 Japan +81-48-585-6896 +81-48-585-6304
| | - Shota Takahashi
- Advanced Science Research Laboratory, Saitama Institute of Technology 1690 Fusaiji, Fukaya Saitama 369-0293 Japan +81-48-585-6896 +81-48-585-6304
| | - Dai Kato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology 1-1-1 Higashi, Tsukuba Ibaraki 305-8566 Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology 1690 Fusaiji, Fukaya Saitama 369-0293 Japan +81-48-585-6896 +81-48-585-6304
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Abstract
Carbon materials have been widely used for electrochemical analysis and include carbon nanotubes, graphene, and boron-doped diamond electrodes in addition to conventional carbon electrodes, such as those made of glassy carbon and graphite. Of the carbon-based electrodes, carbon film has advantages because it can be fabricated reproducibly and micro- or nanofabricated into electrodes with a wide range of shapes and sizes. Here, we report two categories of hybrid-type carbon film electrodes for mainly electroanalytical applications. The first category consists of carbon films doped or surface terminated with other atoms such as nitrogen, oxygen and fluorine, which can control surface hydrophilicity and lipophilicity or electrocatalytic performance, and are used to detect various electroactive biochemicals. The second category comprises metal nanoparticles embedded in carbon film electrodes fabricated by co-sputtering, which exhibits high electrocatalytic activity for environmental and biological samples including toxic heavy metal ions and clinical sugar markers, which are difficult to detect at pure carbon-based electrodes.
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Affiliation(s)
- Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji Fukaya Saitama, 369-0293, Japan.
| | - Saki Ohta
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji Fukaya Saitama, 369-0293, Japan
| | - Shota Takahashi
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji Fukaya Saitama, 369-0293, Japan
| | - Zixin Zhang
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji Fukaya Saitama, 369-0293, Japan
| | - Tomoyuki Kamata
- Health and Medical Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Dai Kato
- Health and Medical Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566, Japan
| | - Shunsuke Shiba
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering Ehime University, 3-Bunkyo-cho, Matsuyama, Ehime, 790-8577, Japan
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Yamada M, Kato S, Mito K, Furui A, Niwa O, Terada N. Early functional recovery after two-stage surgery with an allogenic bone graft for baseplate loosening in reverse shoulder arthroplasty: a case report. Fujita Med J 2021; 7:29-34. [PMID: 35111541 PMCID: PMC8749484 DOI: 10.20407/fmj.2020-002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 05/02/2020] [Indexed: 11/30/2022]
Abstract
OBJECTIVES Reverse shoulder arthroplasty (RSA) for cuff tear arthropathy results in good shoulder function. However, RSA is associated with several complications, including infection, dislocation of the shoulder joint, implant loosening, and axillary nerve palsy. Several problems may also occur on the glenoid side, including bone defects of the glenoid, baseplate loosening, and displacement of the sphere. Herein, we report a 79-year-old man who obtained early functional recovery following a two-stage operation with an allogenic bone graft to treat baseplate loosening and a glenoid bone defect after RSA. CASE REPORT The patient presented with pain during motion and limited active shoulder joint movement 5 weeks after undergoing RSA for cuff tear arthropathy. CT revealed baseplate loosening and a glenoid bone defect; these complications were treated via a two-stage operation. The first stage comprised the removal of all implants and the grafting of allogenic bone from the femoral head into the glenoid defect. Six months later, CT confirmed complete union of the grafted bone and glenoid. The second stage comprised the re-insertion of all implants. Two months after the last operation, the active shoulder range of motion of the affected side was almost identical to that of the contralateral side. CONCLUSION Good early functional recovery was obtained using a two-stage operation for baseplate loosening after RSA. Allogenic bone grafting was effective in the reconstruction of the glenoid defect.
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Affiliation(s)
- Mitsuko Yamada
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
| | - Shinichi Kato
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
| | - Kazuaki Mito
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
| | - Atsuo Furui
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
| | - Osamu Niwa
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
| | - Nobuki Terada
- Department of Orthopaedic Surgery and Restorative Medicine of the
Neuro-Musculoskeletal System, Fujita Health University Bantane Hospital,
Nagoya, Aichi, Japan
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Kato S, Terada N, Niwa O, Yamada M. Risk Factors Affecting Cage Retropulsion into the Spinal Canal Following Posterior Lumbar Interbody Fusion: Association with Diffuse Idiopathic Skeletal Hyperostosis. Asian Spine J 2020; 15:840-848. [PMID: 33371621 PMCID: PMC8696061 DOI: 10.31616/asj.2020.0434] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 09/27/2020] [Indexed: 11/23/2022] Open
Abstract
Study Design This was a retrospective observational study. Purpose We identify risk factors, including physical and surgical factors, and comorbidities affecting cage retropulsion following posterior lumbar interbody fusion (PLIF). Overview of Literature Diffuse idiopathic skeletal hyperostosis (DISH) is considered a risk factor for reoperation after PLIF. We evaluated the effect of DISH on cage retropulsion into the spinal canal, which may require surgical revision for severe neurological disorders. Methods A total of 400 patients (175 men, 225 women) who underwent PLIF were observed for >1 year. Factors investigated included the frequency of cage retropulsion and surgical revision. In addition, physical (age, sex, disease), surgical (fusion and PLIF levels, cage number, grade 2 osteotomy), and comorbid (DISH, existing vertebral fracture) factors were compared between patients with and without cage retropulsion. Factors related to surgical revision during the observation period were also considered. Results Cage retropulsion occurred in 15 patients and surgical revision was performed in 11. Revisions included the replacement of pedicle screws (PSs) with larger screws in all patients and supplementary implants in 10. Among the patients with cage retropulsion, the average PLIF level was 2.7, with DISH present in nine patients and existing vertebral fractures in six. Factors affecting cage retropulsion were diagnoses of osteoporotic vertebral fracture, multilevel fusion, single-cage insertion, grade 2 osteotomy, presence of DISH, and existing vertebral fracture. Multivariable analysis indicated that retropulsion of a fusion cage occurred significantly more frequently in patients with DISH and multilevel PLIF. Conclusions DISH and multilevel PLIF were significant risk factors affecting cage retropulsion. Revision surgery for cage retropulsion revealed PS loosening, suggesting that implant replacement was necessary to prevent repeat cage retropulsion after revision.
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Affiliation(s)
- Shinichi Kato
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Nobuki Terada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Osamu Niwa
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
| | - Mitsuko Yamada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, School of Medicine, Fujita Health University, Nagoya, Japan
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16
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Hashimoto H, Goto K, Sakata K, Watanabe S, Kamata T, Kato D, Niwa O, Kuraya E, Nishimi T, Takemoto M, Kunitake M. Stand-Alone Semi-Solid-State Electrochemical Systems Based on Bicontinuous Microemulsion Gel Films. Anal Chem 2020; 92:14031-14037. [PMID: 32942844 DOI: 10.1021/acs.analchem.0c02948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bicontinuous microemulsion (BME)-based hydrogel films were integrated with screen-printed electrodes (SPEs) comprising working, counter, and reference electrodes to form stand-alone, semi-solid-state electrochemical systems that do not require an outer electrolyte solution. The gel network of the BME hydrogel only exists in the microaqueous phase and retains the structure of the entire BME gel. Following gelation, a microaqueous phase with sufficient ionic strength ensured effective ionic conductivity, even in thin gel films. This enabled the electrochemical reaction to proceed using a thin gel film as an electrolyte solution. However, an intact micro-oil phase with no gel network enabled efficient extraction from an external oil solution and exhibited rapid electrochemistry that was comparable to that of a BME solution. Cyclic voltammograms of lipophilic redox species in oil using the gel-integrated SPE system demonstrated successfully in the oil itself and in the air with dropped oil onto the system.
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Affiliation(s)
- Hinako Hashimoto
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Kyosei Goto
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Kouhei Sakata
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Satoshi Watanabe
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Tomoyuki Kamata
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Dai Kato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Eisuke Kuraya
- Science and Technology Division, National Institute of Technology, Okinawa College, 905 Henoko, Nago, Okinawa 905-2192, Japan
| | - Taisei Nishimi
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Itopia Hashimoto Bldg. 7F, 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo 101-0032, Japan
| | | | - Masashi Kunitake
- Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.,Institute of Industrial Nanomaterials, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
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Shimizu Y, Taga M, Takahashi Y, Tada I, Takase F, Niwa O, Masauji T. Study of the More Suitable Drugs and Dosage Forms for Administration to Newborn Infants via Feeding Tube Using the Collection Rate as an Indicator. Chem Pharm Bull (Tokyo) 2020; 68:802-805. [PMID: 32741923 DOI: 10.1248/cpb.c20-00154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The dosages of drugs in newborn infants are small. Small dose necessitate consideration of the loss of drug when administered via feeding tube. In this study, we conducted a tube administration test for seven kinds of antiepileptic drugs and two kinds of potassium supplements using a neonatal feeding tube and investigated the drug loss using the collection rate. We also studied the differences in collection rates among different dosage forms and drugs to determine the more suitable dosage forms and drugs. We investigated three dosage forms: powder, fine granules or dry syrup (powdery form) drugs, powdery form drugs that have been pulverized (pulverized powdery forms), and pulverized tablets. Additionally, we investigated two potassium supplements to determine which was more suitable: potassium L-aspartate and potassium gluconate. For topiramate, only the powdery form caused tube obstructions; the collection rates of the pulverized powdery form and pulverized tablets were > 90%. All antiepileptic drugs other than topiramate that were tested had collection rates of about > 90%. Considering stability and pharmacokinetics, the more suitable dosage form for topiramate is pulverized tablets, whereas the more suitable dosage form for other antiepileptic drugs is powdery form. Collection rate of potassium gluconate was higher than that of potassium L-aspartate. The current study, which indicates that potassium gluconate powdery form is the more suitable drug, presents the more suitable dosage form and drug for administration via feeding tube to newborn infants. These results show that it is essential to evaluate passage through the tube using the collection rate.
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Affiliation(s)
| | - Masatoshi Taga
- Department of Pharmacy, Kanazawa Medical University Hospital
| | | | - Iku Tada
- Department of Pharmacy, Kanazawa Medical University Hospital
| | - Fumiyuki Takase
- Department of Pharmacy, Kanazawa Medical University Hospital
| | - Osamu Niwa
- Department of Pharmacy, Kanazawa Medical University Hospital
| | - Togen Masauji
- Department of Pharmacy, Kanazawa Medical University Hospital
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18
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Kato S, Terada N, Niwa O. Activities of Daily Living after Surgical Treatment for Osteoporotic Vertebral Fracture with or without Diffuse Idiopathic Skeletal Hyperostosis: A Retrospective Single-Institutional Study. Asian Spine J 2020; 14:847-856. [PMID: 32460468 PMCID: PMC7788374 DOI: 10.31616/asj.2019.0372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 01/30/2020] [Indexed: 11/29/2022] Open
Abstract
Study Design This investigation was a retrospective observational study. Purpose The aim of this study was to evaluate whether having diffuse idiopathic skeletal hyperostosis (DISH) as a comorbidity affects the patient’s ability to perform activities of daily living (ADL) after surgical treatment for osteoporotic vertebral fracture (OVF). Overview of Literature A few studies have extensively evaluated elderly patients with comorbidities such as DISH and OVF-induced persistent back pain and their ability to perform ADL postoperatively. Methods In this study, 63 patients (21 men and 42 women) who underwent surgical treatment for OVF were enrolled. Of these patients, 26 had DISH (D+) and 37 did not have DISH (D-). Patient demographic characteristics and surgical, clinical, and radiological findings were compared between those with and without DISH. The change in their ability to perform ADL after surgery was also evaluated. Results Age, number of comorbidities, and 1-year mortality rate were significantly higher in the D+ group (p<0.05). Postoperative Visual Analog Scale (VAS) scores were significantly higher in patients with impaired (n=6, p=0.04) abilities to perform ADL, and improvements in VAS scores were significantly higher in patients with unchanged abilities to perform ADL (n=54, p=0.03) after surgery. The average postoperative VAS scores were 2.2 for the D+ group and 2.3 for the D- group, which were not significantly different. Conclusions The frequency of OVF with DISH was higher in elderly men with multiple comorbidities and contributed to a higher 1-year mortality rate than those in patients without DISH. However, preoperative and postoperative VAS scores and improvements in VAS scores were similar between those with and without DISH. Postoperative impaired ability to perform ADL was associated with old age, high postoperative VAS scores, and little improvements in VAS scores, which were limitedly influenced by DISH. Surgical treatment of OVF combined with DISH is effective and appropriate for elderly patients.
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Affiliation(s)
- Shinichi Kato
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
| | - Nobuki Terada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
| | - Osamu Niwa
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
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Lee N, Maeda K, Fukizawa S, Ieiri I, Tomaru A, Akao H, Takeda K, Iwadare M, Niwa O, Masauji T, Yamane N, Kajinami K, Kusuhara H, Sugiyama Y. Microdosing clinical study to clarify pharmacokinetic and pharmacogenetic characteristics of atorvastatin in Japanese hypercholesterolemic patients. Drug Metab Pharmacokinet 2019; 34:387-395. [DOI: 10.1016/j.dmpk.2019.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 07/28/2019] [Accepted: 08/13/2019] [Indexed: 10/26/2022]
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Kato S, Terada N, Niwa O. Surgical Treatment of Osteoporotic Vertebral Fracture Associated with Diffuse Idiopathic Skeletal Hyperostosis along with Comparative Assessment of the Levels of Affected Vertebra or Anterior Column Reconstruction. Spine Surg Relat Res 2019; 4:57-63. [PMID: 32039298 PMCID: PMC7002056 DOI: 10.22603/ssrr.2019-0050] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 07/12/2019] [Indexed: 11/05/2022] Open
Abstract
Introduction Surgical treatment of osteoporotic vertebral fracture (OVF) often involves older patients with various comorbidities; thus, attending physicians must pay special attention to the invasiveness of surgical procedures and possible perioperative complications. In this retrospective observational study, we investigated the relationship between OVF and diffuse idiopathic skeletal hyperostosis (DISH) by examining the clinical characteristics and surgical outcomes. Methods Subjects comprised 26 patients (14 men, 12 women) who underwent surgical treatment for OVF complicated by DISH. Vertebral injuries affected the thoracolumbar transitional vertebrae in 18 patients and the middle and lower lumbar vertebrae in eight patients. The clinical characteristics, surgical results, radiological assessments, and outcomes were evaluated on the basis of the levels of affected vertebrae and whether anterior column reconstruction (ACR) was performed. Results Visual Analog Scale (VAS) measurements improved from an average of 69.7 mm before surgery to 21.3 mm after surgery. 14 patients had neurological deficits, who exhibited improvements by one or more steps on the Frankel scale after surgery. Activities of daily living (ADLs) were maintained during the six-month period following surgery in 23 patients. Comorbidity was observed in 22 patients. 14 patients had perioperative complications, and six required additional surgery. Both operating time and blood loss volume were significantly higher in patients in the middle and lower lumbar vertebrae and ACR groups. Postoperative correction loss was also significantly lower in the ACR group. Conclusions Favorable degrees of improvement in neurological deficits and VAS were observed following surgery in patients with OVF complicated by DISH, and postoperative ADLs were maintained in 92% of the patients. Elderly men frequently presented with comorbidities, and the frequencies of patients with perioperative complications and those requiring additional surgery were high.
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Affiliation(s)
- Shinichi Kato
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
| | - Nobuki Terada
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
| | - Osamu Niwa
- Department of Orthopedic Surgery, Restorative Medicine of Neuro-Musculoskeletal System, Fujita Health University School of Medicine, Nagoya, Japan
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Ohta S, Shiba S, Yajima T, Kamata T, Kato D, Niwa O. Gas-phase Treatment Methods for Chemical Termination of Sputtered Nanocarbon Film Electrodes to Suppress Surface Fouling by Proteins. J PHOTOPOLYM SCI TEC 2019. [DOI: 10.2494/photopolymer.32.523] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Saki Ohta
- Advanced Science Research Laboratory, Saitama Institute of Technology
| | - Shunsuke Shiba
- Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University
| | - Tatsuhiko Yajima
- Advanced Science Research Laboratory, Saitama Institute of Technology
| | - Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology
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Kamata T, Kato D, Niwa O. Electrochemical performance at sputter-deposited nanocarbon film with different surface nitrogen-containing groups. Nanoscale 2019; 11:10239-10246. [PMID: 31094397 DOI: 10.1039/c9nr01569h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Carbon materials containing nitrogen have been extensively studied as electrode materials for use in non-platinum cathodes of fuel cells due to their high electrocatalytic activity for oxygen reduction. The activity is strongly dependent on the structure of surface nitrogen-containing functional groups. Carbon film containing nitrogen is also suitable for analytical applications because of its low background noise and its electrocatalytic activity, which is superior to that of pure carbon film. Here, we fabricated sputter-deposited nanocarbon film with a nitrogen-containing group and estimated the efficacy of a surface nitrogen-containing group for detecting biomolecules. Two types of carbon films, one rich in graphite-like nitrogen-containing bonds and the other rich in pyridine-like bonds, were successfully fabricated without changing their nitrogen concentration, sp2/sp3 ratio or surface flatness. The carbon film rich in pyridine-like bonds shows a positive oxygen reduction peak of about 250 mV compared with pure carbon film and is also 200 mV more positive compared with film with graphite-like nitrogen-containing bonds. This indicates that pyridine-like bonds contribute more effectively to electrocatalytic activity than graphite-like nitrogen-containing bonds. For detecting biomolecules, carbon film rich in pyridine-like bonds also exhibits more negative peak potentials for the oxidation of NADH and l-ascorbic acid, suggesting that carbon film rich in pyridine-like bonds will show improved performance for detecting electroactive biomolecules.
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Affiliation(s)
- Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
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Kamata T, Sumimoto M, Shiba S, Kurita R, Niwa O, Kato D. Increased electrode activity during geosmin oxidation provided by Pt nanoparticle-embedded nanocarbon film. Nanoscale 2019; 11:8845-8854. [PMID: 31012904 DOI: 10.1039/c9nr00793h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The musty odor compound geosmin was electrochemically detected by using Pt nanoparticle (PtNP)-embedded nanocarbon (Pt-C) films formed with unbalanced magnetron (UBM) co-sputtering. The sputtered Pt components formed NPs (typically 1.53-4.75 nm in diameter) spontaneously in the carbon films, owing to the poor intermiscibility of Pt with carbon. The surface concentrations of PtNPs embedded in the nanocarbon film were widely controllable (Pt = 4.8-35.9 at%) by regulating the target powers of the Pt and carbon individually. The obtained film had a flat surface (Ra = 0.17-0.18 nm) despite the fact the PtNPs were partially exposed at the surface. Compared with a Pt film electrode, some Pt-C films exhibited higher electrode activity against geosmin although the surface Pt concentrations of these Pt-C films were much lower than that of the Pt film electrode, thanks to the wider potential window and lower background current that resulted from the ultraflat and stable carbon-based film prepared by UBM co-sputtering. Computational experiments revealed that the theoretical oxidation potential (Eox) value for geosmin was relatively similar to that obtained in electrochemical experiments using our Pt-C film electrode. Moreover, we also theoretically estimated the possible oxidation site of geosmin molecules and the advantage of the NP shape of the electroactive Pt parts as regards the electrochemical oxidation of geosmin. We successfully used the Pt-C film (10.6 at%) electrode to detect geosmin in combination with HPLC at a low detection limit of 100 ng L-1.
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Affiliation(s)
- Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
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Niwa O, Kato S, Terada N. Correlation between ultrasonographic findings and symptoms of knee osteoarthritis. Fujita Med J 2019; 5:49-52. [PMID: 35111501 PMCID: PMC8766228 DOI: 10.20407/fmj.2018-013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 09/18/2018] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Knee osteoarthritis (OA) is mainly diagnosed by clinical and radiographic findings. The aim of this study was to evaluate the correlation between ultrasonography (US) findings during flexion and knee loading and symptoms of knee OA. METHODS We studied 33 knees with OA in 21 patients. Using US, the medial meniscal protrusion was measured at the midpoint of the medial joint space with the patient standing and the knee in maximum extension and flexion. With the knee in extension, the thickness of the synovial membrane at the suprapatellar area and the size of the osteophytes at the medial joint space were measured. Radiography was performed to determine the Kellgren-Lawrence (K-L) scores. The correlations between US findings and the visual analog scale (VAS) score, Japanese Knee Osteoarthritis Measure (JKOM) score, K-L score, and range of motion (ROM) were analyzed. RESULTS Medial meniscal protrusion was significantly correlated with K-L score and ROM limitation. Synovial membrane thickness was also significantly correlated with the total JKOM and usual activity scores. There was no correlation between the VAS scores and US findings. Multigroup comparisons of the patients' positions during US did not reveal significant intergroup differences. CONCLUSIONS US was able to detect a change in medial meniscal protrusion during knee flexion and loading. Although medial meniscal protrusion was not correlated with pain, it was related to structural changes of the knee, similar to radiographic findings. Synovial membrane thickness detected by US correlated with pain and a disturbance in the usual activity of patients with OA.
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Affiliation(s)
- Osamu Niwa
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal
System, Fujita Health University Bantane Hospital, Nagoya, Aichi,
Japan
| | - Shinichi Kato
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal
System, Fujita Health University Bantane Hospital, Nagoya, Aichi,
Japan
| | - Nobuki Terada
- Department of Orthopaedic Surgery, Restorative Medicine of Neuro-Musculoskeletal
System, Fujita Health University Bantane Hospital, Nagoya, Aichi,
Japan
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Shiba S, Maruyama R, Kamata T, Kato D, Niwa O. Chromatographic Determination of Sugar Probes Used for Gastrointestinal Permeability Test by Employing Nickel-Copper Nanoalloy Embedded in Carbon Film Electrodes. ELECTROANAL 2018. [DOI: 10.1002/elan.201800072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shunsuke Shiba
- Advanced Science Research Laboratory; Saitama Institute of Technology, Fusaiji, 1690, Fukaya; Saitama 369-0293 Japan
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba; Ibaraki 305-8566 Japan
- Graduate School of Pure and Applied Sciences; University of Tsukuba, 1-1-1 Tennodai, Tsukuba; Ibaraki 305-8573 Japan
| | - Rina Maruyama
- Advanced Science Research Laboratory; Saitama Institute of Technology, Fusaiji, 1690, Fukaya; Saitama 369-0293 Japan
| | - Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba; Ibaraki 305-8566 Japan
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba; Ibaraki 305-8566 Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory; Saitama Institute of Technology, Fusaiji, 1690, Fukaya; Saitama 369-0293 Japan
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Tanaka M, Sawaguchi T, Hirata Y, Niwa O, Tawa K, Sasakawa C, Kuraoka K. Properties of modified surface for biosensing interface. J Colloid Interface Sci 2017; 497:309-316. [PMID: 28288377 DOI: 10.1016/j.jcis.2017.02.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 02/28/2017] [Accepted: 02/28/2017] [Indexed: 11/24/2022]
Abstract
Properties of modified surface, behavior against salting-out effect, suppressive effect for protein nonspecific adsorption, and wettability were examined using various mercapto compounds bearing methyloligoethylene glycol, oligoethylene glycol, alkyl oligoethylene glycol, alkyl phosphoryl choline, alkyl inverse phosphoryl choline, and alkyl sulfobetaine moieties. The behavior against salting-out effect was examined using gold nanoparticle with PBS and NaCl aqueous solution. The suppressive effect for protein nonspecific adsorption was evaluated by SPR, and the wettability was measured on the SPR chip. The gold nanoparticle modified with 8C3EG, 12C4EG, 12CPC, 6CCP, and 12CCP showed excellent behavior against salting-out effect. The suppression of protein nonspecific adsorption was effective with 6EG, 12C4EG, 12CPC, and 12CS. On the other hand, the modified surface possessed high wettability except for the surface modified with M6EG. The results indicate that incorporation of alkyl group into surface modification materials is effective for the enhancement of behavior against salting-out effect and suppressive effect for protein nonspecific adsorption regardless of wettability. Among the zwitter ionic derivatives, inverse phosphoryl choline derivatives showed intriguing properties, high behavior against salting-out effect with high wettability but low suppressive effect for protein nonspecific adsorption.
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Affiliation(s)
- Mutsuo Tanaka
- Health Research Institute, Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
| | - Takahiro Sawaguchi
- Health Research Institute, Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Yoshiki Hirata
- Health Research Institute, Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Keiko Tawa
- School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Chisato Sasakawa
- School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Koji Kuraoka
- Graduate School of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami, Higashinada, Kobe, Hyogo 658-0022, Japan
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Kurita R, Yanagisawa H, Kamata T, Kato D, Niwa O. On-Chip Evaluation of DNA Methylation with Electrochemical Combined Bisulfite Restriction Analysis Utilizing a Carbon Film Containing a Nanocrystalline Structure. Anal Chem 2017; 89:5976-5982. [DOI: 10.1021/acs.analchem.7b00533] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ryoji Kurita
- Biomedical Research Institute,
National
Institute of Advanced Industrial Science and Technology (AIST) and
DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Hiroyuki Yanagisawa
- Biomedical Research Institute,
National
Institute of Advanced Industrial Science and Technology (AIST) and
DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Tomoyuki Kamata
- Biomedical Research Institute,
National
Institute of Advanced Industrial Science and Technology (AIST) and
DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Dai Kato
- Biomedical Research Institute,
National
Institute of Advanced Industrial Science and Technology (AIST) and
DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Osamu Niwa
- Biomedical Research Institute,
National
Institute of Advanced Industrial Science and Technology (AIST) and
DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
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Minamiki T, Minami T, Sasaki Y, Wakida SI, Kurita R, Niwa O, Tokito S. Label-Free Detection of Human Glycoprotein (CgA) Using an Extended-Gated Organic Transistor-Based Immunosensor. Sensors (Basel) 2016; 16:s16122033. [PMID: 27916899 PMCID: PMC5191014 DOI: 10.3390/s16122033] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/26/2016] [Accepted: 11/28/2016] [Indexed: 11/16/2022]
Abstract
Herein, we report on the fabrication of an extended-gated organic field-effect transistor (OFET)-based immunosensor and its application in the detection of human chromogranin A (hCgA). The fabricated OFET device possesses an extended-gate electrode immobilized with an anti-CgA antibody. The titration results of hCgA showed that the electrical changes in the OFET characteristics corresponded to the glycoprotein recognition ability of the monoclonal antibody (anti-CgA). The observed sensitivity (detection limit: 0.11 µg/mL) and selectivity indicate that the OFET-based immunosensor can be potentially applied to the rapid detection of the glycoprotein concentration without any labeling.
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Affiliation(s)
- Tsukuru Minamiki
- Research Center for Organic Electronics, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
- Japan Society for the Promotion of Science (JSPS), Ichibancho, Chiyoda-ku, Tokyo 102-8471, Japan.
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
| | - Tsuyoshi Minami
- Research Center for Organic Electronics, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
| | - Yui Sasaki
- Research Center for Organic Electronics, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
| | - Shin-Ichi Wakida
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan.
| | - Ryoji Kurita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
| | - Osamu Niwa
- Advanced Science Research Laboratory, Saitama Institute of Technology, Fukaya, Saitama 369-0293, Japan.
| | - Shizuo Tokito
- Research Center for Organic Electronics, Graduate School of Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan.
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Abstract
In the field of genetics, epigenetics is the study of changes in gene expression without any change in DNA sequences. Chemical base modification in DNA by DNA methyltransferase, and specifically methylation, has been well studied as the main mechanism of epigenetics. Therefore, the determination of DNA methylation of, for example, 5'-methylcytosine in the CpG sequence in mammals has attracted attention because it should prove valuable in a wide range of research fields including diagnosis, drug discovery, and therapy. Methylated DNA bases and DNA methyltransferase activity are analyzed using conventional methods; however, these methods are time-consuming and require complex multiple operations. Therefore, new methods and devices for DNA methylation analysis are now being actively developed. Furthermore, microfluidic technology has also been applied to DNA methylation analysis because the microfluidic platform offers the promising advantage of making it possible to perform thousands of DNA methylation reactions in small reaction volumes, resulting in a high-throughput analysis with high sensitivity. This review discusses epigenetics and the microfluidic platforms developed for DNA methylation analysis.
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Affiliation(s)
- Ryoji Kurita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) and DAILAB, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8566 Japan.
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30
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Kunitake M, Kuraya E, Kato D, Niwa O, Nishimi T. Electrochemistry in bicontinuous microemulsions based on control of dynamic solution structures on electrode surfaces. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.05.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Niwa O, Barcellos-Hoff MH, Globus RK, Harrison JD, Hendry JH, Jacob P, Martin MT, Seed TM, Shay JW, Story MD, Suzuki K, Yamashita S. ICRP Publication 131: Stem Cell Biology with Respect to Carcinogenesis Aspects of Radiological Protection. Ann ICRP 2016; 44:7-357. [PMID: 26637346 DOI: 10.1177/0146645315595585] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This report provides a review of stem cells/progenitor cells and their responses to ionising radiation in relation to issues relevant to stochastic effects of radiation that form a major part of the International Commission on Radiological Protection's system of radiological protection. Current information on stem cell characteristics, maintenance and renewal, evolution with age, location in stem cell 'niches', and radiosensitivity to acute and protracted exposures is presented in a series of substantial reviews as annexes concerning haematopoietic tissue, mammary gland, thyroid, digestive tract, lung, skin, and bone. This foundation of knowledge of stem cells is used in the main text of the report to provide a biological insight into issues such as the linear-no-threshold (LNT) model, cancer risk among tissues, dose-rate effects, and changes in the risk of radiation carcinogenesis by age at exposure and attained age. Knowledge of the biology and associated radiation biology of stem cells and progenitor cells is more developed in tissues that renew fairly rapidly, such as haematopoietic tissue, intestinal mucosa, and epidermis, although all the tissues considered here possess stem cell populations. Important features of stem cell maintenance, renewal, and response are the microenvironmental signals operating in the niche residence, for which a well-defined spatial location has been identified in some tissues. The identity of the target cell for carcinogenesis continues to point to the more primitive stem cell population that is mostly quiescent, and hence able to accumulate the protracted sequence of mutations necessary to result in malignancy. In addition, there is some potential for daughter progenitor cells to be target cells in particular cases, such as in haematopoietic tissue and in skin. Several biological processes could contribute to protecting stem cells from mutation accumulation: (a) accurate DNA repair; (b) rapidly induced death of injured stem cells; (c) retention of the DNA parental template strand during divisions in some tissue systems, so that mutations are passed to the daughter differentiating cells and not retained in the parental cell; and (d) stem cell competition, whereby undamaged stem cells outcompete damaged stem cells for residence in the niche. DNA repair mainly occurs within a few days of irradiation, while stem cell competition requires weeks or many months depending on the tissue type. The aforementioned processes may contribute to the differences in carcinogenic radiation risk values between tissues, and may help to explain why a rapidly replicating tissue such as small intestine is less prone to such risk. The processes also provide a mechanistic insight relevant to the LNT model, and the relative and absolute risk models. The radiobiological knowledge also provides a scientific insight into discussions of the dose and dose-rate effectiveness factor currently used in radiological protection guidelines. In addition, the biological information contributes potential reasons for the age-dependent sensitivity to radiation carcinogenesis, including the effects of in-utero exposure.
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Tomita S, Niwa O, Kurita R. Artificial Modification of an Enzyme for Construction of Cross-Reactive Polyion Complexes To Fingerprint Signatures of Proteins and Mammalian Cells. Anal Chem 2016; 88:9079-86. [DOI: 10.1021/acs.analchem.6b02010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Shunsuke Tomita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, and DAILAB, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, and DAILAB, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
- Advanced
Science Research Laboratory, Saitama Institute of Technology, 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
| | - Ryoji Kurita
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, and DAILAB, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
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Shiba S, Kato D, Kamata T, Niwa O. Co-sputter deposited nickel-copper bimetallic nanoalloy embedded carbon films for electrocatalytic biomarker detection. Nanoscale 2016; 8:12887-12891. [PMID: 27333270 DOI: 10.1039/c6nr02287a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the fabrication of a nickel (Ni)-copper (Cu) bimetallic nanoalloy (∼3 nm) embedded carbon film electrode with the unbalanced magnetron (UBM) co-sputtering technique, which requires only a one-step process at room temperature. Most of each nanoalloy body was firmly embedded in a chemically stable carbon matrix with an atomically flat surface (Ra: 0.21 nm), suppressing the aggregation and/or detachment of the nanoalloy from the electrode surface. The nanoalloy size and composition can be controlled simply by individually controlling the target powers of carbon, Ni and Cu, which also makes it possible to localize the nanoalloys near the electrode surface. This electrode exhibited excellent electrocatalytic activity for d-mannitol, which should be detected with a low detection limit in urine samples for the diagnosis of severe intestinal diseases. With a Ni/Cu ratio of around 64/36, the electrocatalytic current per metal area was 3.4 times larger than that of an alloy film electrode with a similar composition (∼70/30). This improved electrocatalytic activity realized higher stability (n = 60, relative standard deviation (RSD): 4.6%) than the alloy film (RSD: 32.2%) as demonstrated by continuous measurements of d-mannitol.
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Affiliation(s)
- Shunsuke Shiba
- Advanced Science Research Laboratory, Saitama Institute of Technology, Fusaiji, 1690, Fukaya, Saitama 369-0293, Japan.
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34
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Minamiki T, Minami T, Sasaki Y, Kurita R, Niwa O, Wakida SI, Tokito S. An Organic Field-effect Transistor with an Extended-gate Electrode Capable of Detecting Human Immunoglobulin A. ANAL SCI 2016; 31:725-8. [PMID: 26165299 DOI: 10.2116/analsci.31.725] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We herein report on the development of an extended-gate type organic field-effect transistor (OFET)-based immunosensor for the detection of human immunoglobulin A (IgA). The titration results of IgA exhibited shifts in the transfer characteristics of the OFET sensor device with increasing IgA concentration. A linear detection range from 0 to 10 μg/mL was realized with a detection limit of 2.1 μg/mL, indicating that the OFET-based immunosensor can be potentially applied to the monitoring of infectious diseases and psychological stress in daily life.
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Affiliation(s)
- Tsukuru Minamiki
- Research Center for Organic Electronics (ROEL), Graduate School of Science and Engineering, Yamagata University
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35
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Oda A, Kato D, Yoshioka K, Tanaka M, Kamata T, Todokoro M, Niwa O. Fluorinated Nanocarbon Film Electrode Capable of Signal Amplification for Lipopolysaccharide Detection. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.12.100] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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36
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Hendry JH, Niwa O, Barcellos-Hoff MH, Globus RK, Harrison JD, Martin MT, Seed TM, Shay JW, Story MD, Suzuki K, Yamashita S. ICRP Publication 131: Stem cell biology with respect to carcinogenesis aspects of radiological protection. Ann ICRP 2016; 45:239-52. [PMID: 26956677 DOI: 10.1177/0146645315621849] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Current knowledge of stem cell characteristics, maintenance and renewal, evolution with age, location in 'niches', and radiosensitivity to acute and protracted exposures is reviewed regarding haematopoietic tissue, mammary gland, thyroid, digestive tract, lung, skin, and bone. The identity of the target cells for carcinogenesis continues to point to the more primitive and mostly quiescent stem cell population (able to accumulate the protracted sequence of mutations necessary to result in malignancy), and, in a few tissues, to daughter progenitor cells. Several biological processes could contribute to the protection of stem cells from mutation accumulation: (1) accurate DNA repair; (2) rapid induced death of injured stem cells; (3) retention of the intact parental strand during divisions in some tissues so that mutations are passed to the daughter differentiating cells; and (4) stem cell competition, whereby undamaged stem cells outcompete damaged stem cells for residence in the vital niche. DNA repair mainly operates within a few days of irradiation, while stem cell replications and competition require weeks or many months depending on the tissue type. This foundation is used to provide a biological insight to protection issues including the linear-non-threshold and relative risk models, differences in cancer risk between tissues, dose-rate effects, and changes in the risk of radiation carcinogenesis by age at exposure and attained age.
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Affiliation(s)
- J H Hendry
- Christie Medical Physics and Bioengineering, Christie Hospital NHS Foundation Trust and University of Manchester, Manchester M20 4BX, UK
| | - O Niwa
- Fukushima Medical University and Radiation Effects Research Foundation, Japan
| | - M H Barcellos-Hoff
- Radiation Oncology and Cell Biology, New York University School of Medicine, USA
| | - R K Globus
- Bone and Signaling Laboratory, Space Biosciences Research Branch, NASA Ames Research Center, USA
| | - J D Harrison
- Centre for Radiation, Chemical and Environmental Hazards, Health Protection Directorate, Public Health England, UK
| | - M T Martin
- Laboratoire de Genomique et Radiobiologie de la Kertinopoiese, CEA, France
| | | | - J W Shay
- Radiation Oncology, Simmons Cancer Center, University of Texas, Southwestern Medical Center, USA
| | - M D Story
- Radiation Oncology, Simmons Cancer Center, University of Texas, Southwestern Medical Center, USA
| | - K Suzuki
- Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Japan
| | - S Yamashita
- Radiation Medical Sciences, Atomic Bomb Disease Institute, Nagasaki University, Japan
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Adachi N, Adamovitch V, Adjovi Y, Aida K, Akamatsu H, Akiyama S, Akli A, Ando A, Andrault T, Antonietti H, Anzai S, Arkoun G, Avenoso C, Ayrault D, Banasiewicz M, Banaśkiewicz M, Bernardini L, Bernard E, Berthet E, Blanchard M, Boreyko D, Boros K, Charron S, Cornette P, Czerkas K, Dameron M, Date I, De Pontbriand M, Demangeau F, Dobaczewski Ł, Dobrzyński L, Ducouret A, Dziedzic M, Ecalle A, Edon V, Endo K, Endo T, Endo Y, Etryk D, Fabiszewska M, Fang S, Fauchier D, Felici F, Fujiwara Y, Gardais C, Gaul W, Gurin L, Hakoda R, Hamamatsu I, Handa K, Haneda H, Hara T, Hashimoto M, Hashimoto T, Hashimoto K, Hata D, Hattori M, Hayano R, Hayashi R, Higasi H, Hiruta M, Honda A, Horikawa Y, Horiuchi H, Hozumi Y, Ide M, Ihara S, Ikoma T, Inohara Y, Itazu M, Ito A, Janvrin J, Jout I, Kanda H, Kanemori G, Kanno M, Kanomata N, Kato T, Kato S, Katsu J, Kawasaki Y, Kikuchi K, Kilian P, Kimura N, Kiya M, Klepuszewski M, Kluchnikov E, Kodama Y, Kokubun R, Konishi F, Konno A, Kontsevoy V, Koori A, Koutaka A, Kowol A, Koyama Y, Kozioł M, Kozue M, Kravtchenko O, Kruczała W, Kudła M, Kudo H, Kumagai R, Kurogome K, Kurosu A, Kuse M, Lacombe A, Lefaillet E, Magara M, Malinowska J, Malinowski M, Maroselli V, Masui Y, Matsukawa K, Matsuya K, Matusik B, Maulny M, Mazur P, Miyake C, Miyamoto Y, Miyata K, Miyata K, Miyazaki M, Molȩda M, Morioka T, Morita E, Muto K, Nadamoto H, Nadzikiewicz M, Nagashima K, Nakade M, Nakayama C, Nakazawa H, Nihei Y, Nikul R, Niwa S, Niwa O, Nogi M, Nomura K, Ogata D, Ohguchi H, Ohno J, Okabe M, Okada M, Okada Y, Omi N, Onodera H, Onodera K, Ooki S, Oonishi K, Oonuma H, Ooshima H, Oouchi H, Orsucci M, Paoli M, Penaud M, Perdrisot C, Petit M, Piskowski A, Płocharski A, Polis A, Polti L, Potsepnia T, Przybylski D, Pytel M, Quillet W, Remy A, Robert C, Sadowski M, Saito M, Sakuma D, Sano K, Sasaki Y, Sato N, Schneider T, Schneider C, Schwartzman K, Selivanov E, Sezaki M, Shiroishi K, Shustava I, Śniecińska A, Stalchenko E, Staroń A, Stromboni M, Studzińska W, Sugisaki H, Sukegawa T, Sumida M, Suzuki Y, Suzuki K, Suzuki R, Suzuki H, Suzuki K, Świderski W, Szudejko M, Szymaszek M, Tada J, Taguchi H, Takahashi K, Tanaka D, Tanaka G, Tanaka S, Tanino K, Tazbir K, Tcesnokova N, Tgawa N, Toda N, Tsuchiya H, Tsukamoto H, Tsushima T, Tsutsumi K, Umemura H, Uno M, Usui A, Utsumi H, Vaucelle M, Wada Y, Watanabe K, Watanabe S, Watase K, Witkowski M, Yamaki T, Yamamoto J, Yamamoto T, Yamashita M, Yanai M, Yasuda K, Yoshida Y, Yoshida A, Yoshimura K, Żmijewska M, Zuclarelli E. Measurement and comparison of individual external doses of high-school students living in Japan, France, Poland and Belarus-the 'D-shuttle' project. J Radiol Prot 2016; 36:49-66. [PMID: 26613195 DOI: 10.1088/0952-4746/36/1/49] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Twelve high schools in Japan (of which six are in Fukushima Prefecture), four in France, eight in Poland and two in Belarus cooperated in the measurement and comparison of individual external doses in 2014. In total 216 high-school students and teachers participated in the study. Each participant wore an electronic personal dosimeter 'D-shuttle' for two weeks, and kept a journal of his/her whereabouts and activities. The distributions of annual external doses estimated for each region overlap with each other, demonstrating that the personal external individual doses in locations where residence is currently allowed in Fukushima Prefecture and in Belarus are well within the range of estimated annual doses due to the terrestrial background radiation level of other regions/countries.
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Affiliation(s)
- N Adachi
- Adachi High School, 2-347 Kakunai, Nihonmatsu, Fukushima 964-0904, Japan
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Kato D, Kamata T, Kato D, Yanagisawa H, Niwa O. Au Nanoparticle-Embedded Carbon Films for Electrochemical As(3+) Detection with High Sensitivity and Stability. Anal Chem 2016; 88:2944-51. [PMID: 26829010 DOI: 10.1021/acs.analchem.6b00136] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Au nanoparticle (AuNP)-embedded carbon films were formed with a one-step reproducible process by using unbalanced magnetron (UBM) cosputtering to make it possible to detect As(3+) in water. The sputtered Au components formed NPs (typically 5 nm in diameter) spontaneously in the carbon films, owing to the poor intermiscibility of Au with carbon. The surface contents of embedded AuNPs in the carbon film were widely controllable (Au = 13-21 at %) by regulating the target powers of Au and carbon individually. The obtained film had a flat surface (Ra = 0.1 nm) despite the fact the AuNPs were partially exposed at the surface. By anodic stripping voltammetry (ASV) As(3+) detection, a limit of detection of 0.55 ppb and linear dynamic range of 1-100 ppb were obtained with our electrode. These values meet the requirements imposed by international regulation. Moreover, our electrode structure realized good electrode stability for repetitive ASV measurements (relative standard deviation (RSD) = 11.7%, n = 15) because the partially embedded AuNP structures prevented the AuNPs from detaching from the surface. This result was achieved by the electrode recovery only by a potential scan from 0.1 to 1.5 V. Our electrodes can be stocked for a long time (2 years) with maintaining the electrode performance, which is very attractive for practical electrode. Selectivity test by using Tsukuba tap water added 10 ppb As(3+) and 1000 ppb Cu(2+) was successfully achieved with existence of 0.1 M EDTA (RSD = 2.6%, n = 3). The ASV results with tap water samples agreed well with those by the conventional ICPMS method.
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Affiliation(s)
- Daiki Kato
- National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba 305-8566, Japan.,Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba 305-8573, Japan
| | - Tomoyuki Kamata
- National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba 305-8566, Japan.,Chiba Institute of Technology , 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba 305-8566, Japan
| | - Hiroyuki Yanagisawa
- Institute of Materials Science, Graduate School of Pure and Applied Sciences, University of Tsukuba , 1-1-1 Tennodai, Tsukuba 305-8573, Japan
| | - Osamu Niwa
- National Institute of Advanced Industrial Science and Technology (AIST) , 1-1-1 Higashi, Tsukuba 305-8566, Japan.,Saitama Institute of Technology , 1690 Fusaiji, Fukaya, Saitama 369-0293, Japan
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Kuraya E, Nagatomo S, Sakata K, Kato D, Niwa O, Nishimi T, Kunitake M. Direct Analysis of Lipophilic Antioxidants of Olive Oils Using Bicontinuous Microemulsions. Anal Chem 2015; 88:1202-9. [PMID: 26639911 DOI: 10.1021/acs.analchem.5b03445] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Quantitative analyses of olive oil for lipophilic antioxidants, such as α-tocopherol and phenolics, by simple electrochemical measurements were conducted in a bicontinuous microemulsion (BME), which was bicontinuously composed of saline and toluene microphases with a surfactant system. Lipophilic antioxidants in oils were directly monitored in BME solutions using a lipophilic, fluorinated nanocarbon-film electrode (F-ECR). The combination of a well-balanced BME and extremely biased electrodes, such as strongly hydrophilic indium/tin oxide and strongly lipophilic (hydrophobic) F-ECR, allowed individual monitoring of hydrophilic and lipophilic antioxidants in the same BME solution without any required extraction. Furthermore, values for the charge Q, integrated from observed currents, showed good linear relationships with the results of conventional assays for antioxidant activity, namely, total phenolics and oxygen radical absorbance capacity assays, even with practical food samples. This proposed methodology provided a very simple, rapid, easily serviceable, and highly reproducible analysis that possesses great potential for applications to a wide range of chemical mixtures, in terms of analyte and media, beyond food oils.
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Affiliation(s)
- Eisuke Kuraya
- Science and Technology Division, Okinawa National College of Technology , 905 Henoko, Nago, Okinawa 905-2192, Japan.,Graduate School of Science and Technology, Kumamoto University , 2-39-1 Kurokami, Kumamoto, Kumamoto 860-8555, Japan
| | - Shota Nagatomo
- Graduate School of Science and Technology, Kumamoto University , 2-39-1 Kurokami, Kumamoto, Kumamoto 860-8555, Japan
| | - Kouhei Sakata
- Graduate School of Science and Technology, Kumamoto University , 2-39-1 Kurokami, Kumamoto, Kumamoto 860-8555, Japan
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Taisei Nishimi
- Japan Technological Research Association of Artificial Photosynthetic Chemical Process (ARPChem), Itopia Hashimoto Building 7F, 2-11-9 Iwamoto-cho, Chiyoda-ku, Tokyo 101-0032, Japan
| | - Masashi Kunitake
- Graduate School of Science and Technology, Kumamoto University , 2-39-1 Kurokami, Kumamoto, Kumamoto 860-8555, Japan
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40
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Kurita R, Yanagisawa H, Yoshioka K, Niwa O. On-Chip Sequence-Specific Immunochemical Epigenomic Analysis Utilizing Outward-Turned Cytosine in a DNA Bulge with Handheld Surface Plasmon Resonance Equipment. Anal Chem 2015; 87:11581-6. [DOI: 10.1021/acs.analchem.5b03520] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ryoji Kurita
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Hiroyuki Yanagisawa
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Kyoko Yoshioka
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
| | - Osamu Niwa
- National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan 305-8566
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41
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Tomita S, Sakao M, Kurita R, Niwa O, Yoshimoto K. A polyion complex sensor array for markerless and noninvasive identification of differentiated mesenchymal stem cells from human adipose tissue. Chem Sci 2015; 6:5831-5836. [PMID: 28970874 PMCID: PMC5618151 DOI: 10.1039/c5sc01259g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 06/29/2015] [Indexed: 12/12/2022] Open
Abstract
Currently available methods for stem cell evaluation require both prior knowledge of specific markers and invasive cell lysis or staining, hampering the development of stem cell products with assured safety and quality. Here, we present a strategy using optical cross-reactive sensor arrays for markerless and noninvasive identification of differentiated stem cell lineages with common laboratory equipment. The sensor array consists of a library of polyion complexes (PICs) between anionic enzymes and synthetic poly(ethylene glycol)-modified polyamines, which can recognize "secretomic signatures" in cell culture supernatants. Due to the reversible nature of PIC formation, the incubation of diluted culture supernatants with PICs caused enzyme release through competitive interactions between the secreted molecules and the PICs, generating unique patterns of recovery in enzyme activity for individual cell types or lineages. Linear discriminant analysis of the patterns allowed not only normal/cancer cell discrimination but also lineage identification of osteogenic and adipogenic differentiation of human mesenchymal stem cells, therefore providing an effective way to characterize cultured cells in the fields of regenerative medicine, tissue engineering and cell biology.
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Affiliation(s)
- Shunsuke Tomita
- Biomedical Research Institute , National Institute of Advanced Industrial Science and Technology , 1-1-1 Higashi , Tsukuba , Ibaraki 305-8566 , Japan .
| | - Miho Sakao
- College of Arts and Sciences , The University of Tokyo , 3-8-1 Komaba , Meguro , Tokyo 153-8902 , Japan .
| | - Ryoji Kurita
- Biomedical Research Institute , National Institute of Advanced Industrial Science and Technology , 1-1-1 Higashi , Tsukuba , Ibaraki 305-8566 , Japan .
| | - Osamu Niwa
- Biomedical Research Institute , National Institute of Advanced Industrial Science and Technology , 1-1-1 Higashi , Tsukuba , Ibaraki 305-8566 , Japan .
| | - Keitaro Yoshimoto
- College of Arts and Sciences , The University of Tokyo , 3-8-1 Komaba , Meguro , Tokyo 153-8902 , Japan .
- Department of Life Sciences , Graduate School of Arts and Sciences , The University of Tokyo , 3-8-1 Komaba , Meguro , Tokyo 153-8902 , Japan
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42
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Kurita R, Yanagisawa H, Yoshioka K, Niwa O. Site-specific immunochemical methylation assessment from genome DNA utilizing a conformational difference between looped-out target and stacked-in nontarget methylcytosines. Biosens Bioelectron 2015; 70:366-71. [DOI: 10.1016/j.bios.2015.03.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 03/23/2015] [Accepted: 03/24/2015] [Indexed: 02/06/2023]
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Iwasaki W, Sathuluri RR, Niwa O, Miyazaki M. Influence of Contact Force on Electrochemical Responses of Redox Species Flowing in Nitrocellulose Membrane at Micropyramid Array Electrode. ANAL SCI 2015; 31:729-32. [PMID: 26165300 DOI: 10.2116/analsci.31.729] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In this study, we developed a micropyramid array electrode that facilitates contact between a nitrocellulose membrane and electrode, which is important to realize a quantitative and sensitive electrochemical detection system for immunochromatography. We evaluated the micropyamid array electrode with our newly developed detection system that can measure contact forces between a membrane and electrode, and also investigated the relationship between redox current and contact forces. By using normal pulse voltammetry, we observed higher reduction currents over a flat surface electrode at lower contact forces with the micropyramid array.
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Affiliation(s)
- Wataru Iwasaki
- Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology
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Grant EJ, Ozasa K, Ban N, de González AB, Cologne J, Cullings HM, Doi K, Furukawa K, Imaoka T, Kodama K, Nakamura N, Niwa O, Preston DL, Rajaraman P, Sadakane A, Saigusa S, Sakata R, Sobue T, Sugiyama H, Ullrich R, Wakeford R, Yasumura S, Milder CM, Shore RE. A report from the 2013 international symposium: the evaluation of the effects of low-dose radiation exposure in the life span study of atomic bomb survivors and other similar studies. Health Phys 2015; 108:551-556. [PMID: 25811153 DOI: 10.1097/hp.0000000000000262] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The RERF International Low-Dose Symposium was held on 5-6 December 2013 at the RERF campus in Hiroshima, Japan, to discuss the issues facing the Life Span Study (LSS) and other low-dose studies. Topics included the current status of low-dose risk detection, strategies for low-dose epidemiological and statistical research, methods to improve communication between epidemiologists and biologists, and the current status of radiological studies and tools. Key points made by the participants included the necessity of pooling materials over multiple studies to gain greater insight where data from single studies are insufficient; generating models that reflect epidemiological, statistical, and biological principles simultaneously; understanding confounders and effect modifiers in the current data; and taking into consideration less studied factors such as the impact of dose rate. It is the hope of all participants that this symposium be used as a trigger for further studies, especially those using pooled data, in order to reach a greater understanding of the health effects of low-dose radiation.
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Affiliation(s)
- E J Grant
- *Radiation Effects Research Foundation, Hiroshima, Japan; †Tokyo Healthcare University, Tokyo, Japan; ‡U.S. National Cancer Institute, Bethesda, MD; §National Institute of Radiological Sciences, Chiba, Japan; **Fukushima Medical University, Fukushima, Japan; ††Hirosoft, Eureka, CA; ‡‡Osaka University, Osaka, Japan; §§University of Manchester, Manchester, UK
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Kuraya E, Nagatomo S, Sakata K, Kato D, Niwa O, Nishimi T, Kunitake M. Simultaneous Electrochemical Analysis of Hydrophilic and Lipophilic Antioxidants in Bicontinuous Microemulsion. Anal Chem 2015; 87:1489-93. [DOI: 10.1021/ac5044576] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Eisuke Kuraya
- Science
and Technology Division, Okinawa National College of Technology, 905 Henoko, Okinawa 905-2192, Japan
- Graduate
School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Shota Nagatomo
- Graduate
School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Kouhei Sakata
- Graduate
School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
| | - Dai Kato
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Osamu Niwa
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Taisei Nishimi
- Fujifilm Corporation, 577 Ushijima,
Kaisei-machi, Ashigarakami-gun, Kanagawa 258-9577, Japan
| | - Masashi Kunitake
- Graduate
School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
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Guo Q, Liu D, Zhang X, Li L, Hou H, Niwa O, You T. Pd–Ni Alloy Nanoparticle/Carbon Nanofiber Composites: Preparation, Structure, and Superior Electrocatalytic Properties for Sugar Analysis. Anal Chem 2014; 86:5898-905. [DOI: 10.1021/ac500811j] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Qiaohui Guo
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Dong Liu
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Xueping Zhang
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Libo Li
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
| | - Haoqing Hou
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330027, China
| | - Osamu Niwa
- Nano-biodevice
Research Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Tianyan You
- State
Key Laboratory of Electroanalytical Chemistry, Changchun Institute
of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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Affiliation(s)
- Dong Liu
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
| | - Qiaohui Guo
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
| | - Haoqing Hou
- College
of Chemistry and Chemical Engineering, Jiangxi Normal University, Jiangxi 330027, China
| | - Osamu Niwa
- Nano-biodevice Research
Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology, Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
| | - Tianyan You
- State Key Laboratory
of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, Jilin 130022, China
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Kato D, Oda A, Tanaka M, Iijima S, Kamata T, Todokoro M, Yoshimi Y, Niwa O. Poly-ε-Lysine Modified Nanocarbon Film Electrodes for LPS Detection. ELECTROANAL 2014. [DOI: 10.1002/elan.201300542] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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49
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Kamata T, Kato D, Hirono S, Niwa O. Correction to Structure and Electrochemical Performance of Nitrogen-Doped Carbon Film Formed by Electron Cyclotron Resonance Sputtering. Anal Chem 2014. [DOI: 10.1021/ac404138h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tanaka M, Yoshioka K, Hirata Y, Fujimaki M, Kuwahara M, Niwa O. Design and fabrication of biosensing interface for waveguide-mode sensor. Langmuir 2013; 29:13111-13120. [PMID: 24063697 DOI: 10.1021/la402802u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In order to develop a biosensing system with waveguide-mode sensor, fabrication of a biosensing interface on the silica surface of the sensing chip was carried out using triethoxysilane derivatives with anti-leptin antibody. Triethoxysilane derivatives bearing succinimide ester and oligoethylene glycol moieties were synthesized to immobilize the antibody and to suppress nonspecific adsorption of proteins, respectively. The chip modified with triethoxysilane derivatives bearing oligoethylene glycol moiety suppressed nonspecific adsorption of proteins derived from human serum effectively by rinse with PBS containing surfactant (0.05% Tween 20). On the other hand, it was confirmed that antibody was immobilized on the chip by immersion into antibody solution to show response of antigen-antibody reaction, where the chip was modified with triethoxysilane derivatives bearing succinimide ester moiety. When the interface was fabricated with antibody and a mixture of triethoxysilane derivatives bearing succinimide ester and oligoethylene glycol moieties, the response of antigen-antibody reaction depended on composition of the mixture and enhanced with the increase of ratio for triethoxysilane derivatives bearing succinimide ester moiety reflecting the antibody concentration immobilized on the chip. While introduction of excess triethoxysilane derivatives bearing succinimide ester moiety induced nonspecific adsorption of proteins derived from human serum, the immobilized antibody on the chip kept its activity after 1-month storage in a refrigerator. Taking into consideration those factors, the biosensing interface was fabricated using triethoxysilane derivatives with anti-leptin antibody to examine performance of the waveguide-mode sensor. It was found that the detection limits for human leptin were 50 ng/mL in PBS and 100 ng/mL in human serum. The results demonstrate that the waveguide-mode sensor powered by the biosensing interface fabricated with those triethoxysilane derivatives and antibody has potential to detect several tens of nanograms per milliliter of biomarkers in human serum with an unlabeled detection method.
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Affiliation(s)
- Mutsuo Tanaka
- Biomedical Research Institute , Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
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