1
|
Kawakami T, Ooshima T, Ohyama M, Sugaya N, Nishi I, Yoshitomi T, Takai H, Wakayama T, Ohno H, Tahara M, Ikarashi Y. [Examination of Analytical Method for Tris(2,3-dibromopropyl)phosphate and Bis(2,3-dibromopropyl)phosphate to Revise the Official Methods Based on "Act on the Control of Household Products Containing Harmful Substances"]. YAKUGAKU ZASSHI 2024; 144:463-471. [PMID: 38556319 DOI: 10.1248/yakushi.23-00188] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/02/2024]
Abstract
In Japan, the use of frame retardants [tris(2,3-dibromopropyl)phosphate: TDBPP and bis(2,3-dibromopropyl)phosphate: BDBPP] in several household textile products is banned under the "Act on the Control of Household Products Containing Harmful Substances." As the official analytical methods for testing these substances have not been revised for over 42 years, several issues such as the using of harmful reagents, have been pointed out. Therefore, we developed a new method to revise the official method in our previous study. In this study, the validity of the developed test method is evaluated at six laboratories using two types of textile samples spiked with TDBPP and BDBPP at three concentrations (4, 8, and 20 µg/g). TDBPP and BDBPP are extracted under reflux using methanol containing hydrochloric acid. TDBPP is analyzed using GC-MS, and BDBPP is also analyzed using GC-MS after methylation with trimethylsilyl diazomethane. Although the accuracy (70-120%), repeatability (<10%), and reproducibility (<15%) of a few samples, mainly low concentration samples, are out of range, overall, the concentration level of detection limits of TDBPP and BDBPP (8 and 10 µg/g) in official analytical methods are quantifiable with sufficient precision using the proposed method. Furthermore, harmful reagents are not used in this method. Thus, the method validated in this study is effective as a revised method for the testing of TDBPP and BDBPP in household textile products.
Collapse
Affiliation(s)
| | | | | | | | - Iwaki Nishi
- Kanagawa Prefectural Institute of Public Health
| | | | | | | | | | | | | |
Collapse
|
2
|
Fujita K, Ohno H. Hydrated Ionic Liquids: Perspective for Bioscience. CHEM REC 2023; 23:e202200282. [PMID: 36744600 DOI: 10.1002/tcr.202200282] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/20/2023] [Indexed: 02/07/2023]
Abstract
Hydrated ionic liquid (IL) is a simple mixture of IL and water. Unique aqueous electrolyte solution can be designed by mixing IL with limited amount of water. In most hydrated ILs, there are no free water and all are strongly interacted with ions. The properties of hydrated ILs, such as polarity, viscosity, ion mobility, and hydrogen bonding ability, can therefore be controlled simply by water content. This mixture is expected to provide similar environment to that of living cell, and is desired to be effective solvents for biomolecules. In this account, we would like to survey the basic properties, recent results, and future aspects of the hydrated ILs.
Collapse
Affiliation(s)
- Kyoko Fujita
- Department of Pathophysiology, Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo, 192-0392, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo, 184-8588, Japan
| |
Collapse
|
3
|
Yoshizawa-Fujita M, Ohno H. Applications of Zwitterions and Zwitterionic Polymers for Li-Ion Batteries. CHEM REC 2023; 23:e202200287. [PMID: 36782072 DOI: 10.1002/tcr.202200287] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/24/2023] [Indexed: 02/15/2023]
Abstract
A zwitterion is a neutral compound that has both a cation and an anion in the same molecule. Quaternary ammonium cations are frequently used for zwitterions. Zwitterions with quaternary ammonium cations are also common in biological molecules, such as phospholipids, which are the main components of cell membranes. Chemically, they have broad applicability because they are dielectric, non-volatile, and highly polar compounds with a large dipole moment. In addition, after salt addition, ion exchange does not occur in the presence of zwitterions. Owing to these characteristics, zwitterions have been applied as novel electrolyte materials targeting high ionic conductivity. In this review, application of zwitterions and their polymers for Li-ion batteries is addressed.
Collapse
Affiliation(s)
- Masahiro Yoshizawa-Fujita
- Department of Materials and Life Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| |
Collapse
|
4
|
Fujita K, Kobayashi K, Ito A, Yanagisawa S, Ichida K, Takeda K, Nakamura N, Ohno H. Improved renaturation process of aggregated recombinant proteins through the design of hydrated ionic liquids. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121440] [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: 02/19/2023]
|
5
|
Barutta F, Bellini S, Kimura S, Hase K, Corbetta B, Corbelli A, Fiordaliso F, Bruno S, Biancone L, Barreca A, Papotti M, Hirsh E, Martini M, Gambino R, Durazzo M, Ohno H, Gruden G. Protective effect of the tunneling nanotube-TNFAIP2/M-sec system on podocyte autophagy in diabetic nephropathy. Autophagy 2023; 19:505-524. [PMID: 35659195 PMCID: PMC9851239 DOI: 10.1080/15548627.2022.2080382] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Podocyte injury leading to albuminuria is a characteristic feature of diabetic nephropathy (DN). Hyperglycemia and advanced glycation end products (AGEs) are major determinants of DN. However, the underlying mechanisms of podocyte injury remain poorly understood. The cytosolic protein TNFAIP2/M-Sec is required for tunneling nanotubes (TNTs) formation, which are membrane channels that transiently connect cells, allowing organelle transfer. Podocytes express TNFAIP2 and form TNTs, but the potential relevance of the TNFAIP2-TNT system in DN is unknown. We studied TNFAIP2 expression in both human and experimental DN and the renal effect of tnfaip2 deletion in streptozotocin-induced DN. Moreover, we explored the role of the TNFAIP2-TNT system in podocytes exposed to diabetes-related insults. TNFAIP2 was overexpressed by podocytes in both human and experimental DN and exposre of podocytes to high glucose and AGEs induced the TNFAIP2-TNT system. In diabetic mice, tnfaip2 deletion exacerbated albuminuria, renal function loss, podocyte injury, and mesangial expansion. Moreover, blockade of the autophagic flux due to lysosomal dysfunction was observed in diabetes-injured podocytes both in vitro and in vivo and exacerbated by tnfaip2 deletion. TNTs allowed autophagosome and lysosome exchange between podocytes, thereby ameliorating AGE-induced lysosomal dysfunction and apoptosis. This protective effect was abolished by tnfaip2 deletion, TNT inhibition, and donor cell lysosome damage. By contrast, Tnfaip2 overexpression enhanced TNT-mediated transfer and prevented AGE-induced autophagy and lysosome dysfunction and apoptosis. In conclusion, TNFAIP2 plays an important protective role in podocytes in the context of DN by allowing TNT-mediated autophagosome and lysosome exchange and may represent a novel druggable target.Abbreviations: AGEs: advanced glycation end products; AKT1: AKT serine/threonine kinase 1; AO: acridine orange; ALs: autolysosomes; APs: autophagosomes; BM: bone marrow; BSA: bovine serum albumin; CTSD: cathepsin D; DIC: differential interference contrast; DN: diabetic nephropathy; FSGS: focal segmental glomerulosclerosis; HG: high glucose; KO: knockout; LAMP1: lysosomal-associated membrane protein 1; LMP: lysosomal membrane permeabilization; MAP1LC3/LC3: microtubule-associated protein 1 light chain 3; PI3K: phosphoinositide 3-kinase; STZ: streptozotocin; TNF: tumor necrosis factor; TNFAIP2: tumor necrosis factor, alpha-induced protein 2; TNTs: tunneling nanotubes; WT: wild type.
Collapse
Affiliation(s)
- F. Barutta
- Department of Medical Sciences, University of Turin, Turin, Italy,CONTACT F. Barutta Department of Medical Sciences, Corso Dogliotti 1410126, Turin, Italy
| | - S. Bellini
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - S. Kimura
- Division of Biochemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - K. Hase
- Division of Biochemistry, Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - B. Corbetta
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - A. Corbelli
- Unit of Bioimaging, Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - F. Fiordaliso
- Unit of Bioimaging, Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy
| | - S. Bruno
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - L. Biancone
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - A. Barreca
- Division of Pathology, Città della Salute e della Scienza Hospital, Turin, Italy
| | - M.G. Papotti
- Department of Oncology, University of Turin, Turin, Italy
| | - E. Hirsh
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - M. Martini
- Department of Molecular Biotechnology and Health Sciences, University of Turin, Turin, Italy
| | - R. Gambino
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - M. Durazzo
- Department of Medical Sciences, University of Turin, Turin, Italy
| | - H. Ohno
- Laboratory for Intestinal Ecosystem, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - G. Gruden
- Department of Medical Sciences, University of Turin, Turin, Italy
| |
Collapse
|
6
|
Sakuragi H, Suzuki M, Ohno H. [Validation Study on Developed Methods for Anions and Bromic Acid in Various Mineral Waters by Ion Chromatography]. Shokuhin Eiseigaku Zasshi 2023; 64:161-165. [PMID: 37673606 DOI: 10.3358/shokueishi.64.161] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
Five kinds of anions namely fluoride, chlorate, chlorite, nitrate and nitrite ions, and bromic acid were determined in various mineral waters (MWs), and the methods were validated. MWs are varying in the degree of hardness and contents of carbonate. When the five anions were measured based on the official method of tap water, the peak shape of fluoride ion in MWs with high degree of hardness was different from the standard solution, making it difficult to determine. The same phenomenon was also observed when bromic acid was measured. In order to achieve accurate determination, five-fold dilution with ultrapure water was carried out on the samples. With the additional step, the abnormal peak of both analytes was improved, and no difference in the retention times between standard and sample solutions was observed. The validation tests were performed using the developed methods with the additional diluting step, and the results of all target substances met the criteria of the guideline on analytical method validation for MW in Japan. Our results suggested that the methods we developed could be useful for the accurate determination of the anions and bromic acid in various MWs on the market.
Collapse
|
7
|
Kataoka Y, Mutsug M, Abe T, Abe Y, Ushiyama A, Uchiyama Y, Ohno H, Ohashi K, Kazama T, Kimura A, Kobayashi Y, Kondo M, Sato T, Zama S, Takahashi Y, Takezawa A, Tanaka A, Terui Y, Nagai S, Nomura C, Hanazawa K, Hayakawa M, Hirabayashi N, Fujiyoshi T, Hotta S, Miyakawa H, Murayama Y, Yotsuyanagi M, Watanabe K, Sato K. [Inter-laboratory Study on the Modified Methods for Analyzing Bisphenol A Content for Migration Tests from Polycarbonate Food Apparatuses, Containers, and Packaging]. Shokuhin Eiseigaku Zasshi 2023; 64:154-160. [PMID: 37673605 DOI: 10.3358/shokueishi.64.154] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/08/2023]
Abstract
An inter-laboratory study involving 24 laboratories was conducted to validate the modified analytical method for the migration solution of heptane for the determination of bisphenol A migrating from polycarbonate food processing materials. In this study, two concentrations of samples were blindly coded. Each laboratory determined the analyte (bisphenol A, phenol and p-tert-butylphenol) concentration in each sample according to the established protocol. The obtained values were analyzed statistically using internationally accepted guidelines. Horwitz ratios were calculated based on the reproducibility relative standard deviation (RSDR), which was estimated from the inter-laboratory study, and predicted RSDR, which was calculated using the Horwitz/Thompson equation. Horwitz ratios of the two samples ranged from 0.15 to 0.37 for the three compounds, meeting the performance criteria of less than 2 set by the Codex Alimentarius for analytical method approval. These results showed that this modified analytical method shows good performance as an analytical method for the migration solution of heptane.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Arisa Kimura
- Shizuoka City Institute of Environmental Sciences and Public Health
| | | | | | - Tamaki Sato
- Fukuoka Institute of Health and Environmental Sciences
| | | | | | | | | | | | | | | | - Kotaro Hanazawa
- Japan Inspection Association of Food and Food Industry Environment
| | - Masato Hayakawa
- High Polymer Test & Evaluation Center, Osaka office, Japan Chemical Innovation and Inspection Institute
| | | | | | - Saki Hotta
- Aichi Prefectural Institute of Public Health
| | | | - Yuko Murayama
- Saitama City Institute of Health Science and Research
| | | | - Kazunari Watanabe
- High Polymer Test & Evaluation Center, Tokyo office, Japan Chemical Innovation and Inspection Institute
| | | |
Collapse
|
8
|
Ohno H, Mano S, Katagiri N, Oguri R, Miyazaki K, Ito K, Sekiya Y, Inoue K, Masuda A, Tsuzuku A, Asano F, Hirashita T, Hayashi T. Influence of using history of immune checkpoint inhibitor therapy for neutropenia caused by combination therapy of ramucirumab and docetaxel. Pharmazie 2022; 77:248-254. [PMID: 36199179 DOI: 10.1691/ph.2022.2403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Recently, pretreatment with immune checkpoint inhibitors (ICIs) has been shown to enhance the therapeutic effects of the combination therapy of ramucirumab (RAM) and docetaxel (DTX); however, its influence on the drug's side effects remains unclear. This study investigated the influence of pretreatment with ICIs on the incidence of neutropenia caused by RAM + DTX therapy in patients with non-small cell lung cancer (NSCLC). Patients with NSCLC who received RAM + DTX therapy at Gifu Prefectural General Medical Center between April 2016 and December 2020 were enrolled. Retrospective data regarding age, sex, performance status and detailed treatment history, among others, at treatment initiation were collected from the patients' electronic medical records. Additionally, data on the course number of RAM + DTX therapy, supportive therapy and blood biochemical parameters, including leukocyte and neutrocyte counts, during the treatment period were collected. We identified 41 patients receiving RAM + DTX therapy. Among the more than grade 3 adverse events caused by this therapy, neutropenia was the most common (78.1%). Despite the fact that all previous risk factors influencing this incidence rate had corresponded, the only factor influencing the incidence rate of neutropenia more than grade 3 was ICI treatment history. A difference in the incidence of neutropenia more than grade 3 in the Kaplan-Meier curve was observed between patients with and without ICI pretreatment history (p = 0.037). The pretreatment history of ICI therapy affects the incidence of neutropenia caused by RAM + DTX therapy in patients with NSCLC.
Collapse
Affiliation(s)
- H Ohno
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - S Mano
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - N Katagiri
- College of Pharmacy, Kinjo Gakuin University, Nagoya, Japan
| | - R Oguri
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - K Miyazaki
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - K Ito
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - Y Sekiya
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - K Inoue
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - A Masuda
- Department of Pulmonary Medicine, Gifu Prefectural General Medical Center, Gifu, Japan
| | - A Tsuzuku
- Department of Pulmonary Medicine, Gifu Prefectural General Medical Center, Gifu, Japan
| | - F Asano
- Department of Pulmonary Medicine, Gifu Prefectural General Medical Center, Gifu, Japan
| | - T Hirashita
- Department of Pharmacy, Gifu Prefectural General Medical Center, Gifu, Japan
| | - T Hayashi
- College of Pharmacy, Kinjo Gakuin University, Nagoya, Japan;,
| |
Collapse
|
9
|
Fujita K, Takuya H, Tsukakoshi K, Ohno H, Ikebukuro K. The state of water molecules induces changes in the topologies and interactions of G-quadruplex DNA aptamers in hydrated ionic liquid. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120175] [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: 10/31/2022]
|
10
|
Ozaki A, Mutsuga M, Kishi E, Abe T, Abe Y, Ando K, Ishihara K, Ushiya A, Uchida S, Ohsaka I, Ohno H, Kazama T, Kato C, Kobayashi H, Sato T, Shibata H, Sekido H, Takashima H, Tanaka A, Tonooka H, Hanazawa K, Yamaguchi M, Yamada S, Yoshikawa M, Watanabe K, Sato K. [Validation Study on Migration Test for Plastic Food Utensils, Containers, and Packaging]. Shokuhin Eiseigaku Zasshi 2022; 63:51-61. [PMID: 35650029 DOI: 10.3358/shokueishi.63.51] [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: 11/17/2022]
Abstract
Migration test of food utensils, containers, and packaging is an important test method for confirming the safety and their compliance to the standards. However, there is little report on inter-laboratory study which was performed to evaluate the entire migration test, including migration operations and quantification. An interlaboratory study was performed participating 22 laboratories using 8 types of model synthetic resin samples containing 10 substances with a wide range of Log Pow values to evaluate the accuracy of the entire migration test. As a result, most of HorRat (r) values met the target criteria (0.3<HorRat (r) ≦1.3), but many of HorRat (R) values exceed the target criteria (0.5<HorRat (R) ≦2.0). The results showed good accuracy within the laboratory. However, we found that there was a problem in accuracy between laboratories. The main reason was considered to be the difference in the preparation of migration solution between the laboratories, such as temperature and time control during the migration operation.
Collapse
Affiliation(s)
| | | | | | | | | | - Keiko Ando
- Nagano Environmental Conservation Research Institute
| | | | | | | | - Ikue Ohsaka
- Saitama Prefectural Institute of Public Health
| | | | | | - Chika Kato
- Aichi Prefectural Institute of Public Health
| | | | - Tamaki Sato
- Fukuoka Institute of Health and Environmental Sciences
| | | | | | - Hideo Takashima
- Osaka Office, Japan Chemical Innovation and Inspection Institute
| | | | | | - Kotaro Hanazawa
- Japan Inspection Association of Food and Food Industry Environment
| | | | | | | | | | | |
Collapse
|
11
|
Abe Y, Abe T, Ohno H, Ohashi K, Ozaki A, Kazama T, Kataoka Y, Suzuki K, Nagai S, Hanazawa K, Hayakawa M, Hirabayashi N, Yamaguchi M, Watanabe K, Mutsuga M, Sato K. [Inter-laboratory Study on the Modified Method Assessment for the Determining Methanol Content in Kitchen Detergents]. Shokuhin Eiseigaku Zasshi 2022; 63:97-103. [PMID: 35650035 DOI: 10.3358/shokueishi.63.97] [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: 11/17/2022]
Abstract
We modified a method for determining methanol content in detergents used in kitchens. Furthermore, an inter-laboratory study was conducted in 10 laboratories to validate the modified method. In this study, two concentrations of samples were blindly coded. Each laboratory determined the methanol content in each sample according to a protocol. The determined values were statistically analyzed according to an international harmonized guideline. HorRat values were calculated based on the reproducibility relative standard deviation (RSDR) which was estimated from the interlaboratory study, and predicted RSDR calculated from the Horwitz/Thompson equation. The HorRat values of the two samples were 0.8 and 1.8, meeting the performance criteria of less than 2 set by the Codex Alimentarius for analytical method approval. These results confirm that this modified analytical method shows good performance as an analytical method for determining methanol content in kitchen detergents.
Collapse
Affiliation(s)
| | | | | | | | | | | | | | - Kumi Suzuki
- Tokyo Metropolitan Institute of Public Health
| | | | - Kotaro Hanazawa
- Japan Inspection Association of Food and Food Industry Environment
| | - Masato Hayakawa
- High Polymer Test & Evaluation Center, Osaka Office, Japan Chemical Innovation and Inspection Institute
| | | | | | - Kazunari Watanabe
- High Polymer Test & Evaluation Center, Tokyo Office, Japan Chemical Innovation and Inspection Institute
| | | | | |
Collapse
|
12
|
Ding HT, Kaczmarek O, Lorenz AL, Ohno H, Sandmeyer H, Shu HT. Charm and beauty in the deconfined plasma from quenched lattice QCD. Int J Clin Exp Med 2021. [DOI: 10.1103/physrevd.104.114508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
13
|
Wakayama T, Ito Y, Miyake M, Nomasa K, Sakai K, Oya N, Sato H, Ohno H, Kamijima M. Inhalation exposure to 2-ethyl-1-hexanol causes hepatomegaly and transient lipid accumulation without induction of peroxisome proliferator-activated receptor alpha in mice. Ind Health 2021; 59:383-392. [PMID: 34588381 PMCID: PMC8655744 DOI: 10.2486/indhealth.2020-0252] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 04/13/2021] [Indexed: 06/13/2023]
Abstract
2-Ethyl-1-hexanol (2EH) is a volatile organic compound known to cause sick building syndrome. However, 2EH-induced hepatotoxicity has been mainly evaluated in experiments orally administering 2EH as a metabolite of di(2-ethylhexyl) phthalate. To evaluate the hepatotoxicity risk of 2EH as an indoor air pollutant, we exposed 10-wk-old male ICR mice to 2EH by inhalation for 8 h/d, 5 d/wk for 3 months (0, 20, 60, or 150 ppm) or 6 months (0, 0.5, 10, or 100 ppm). In both experiments, relative liver weights significantly increased in the highest exposure groups. The 3-month exposure increased histopathological lipid droplets in the liver in a dose-dependent manner, hepatic triglyceride at all exposure levels, hepatic phospholipid at 150 ppm, and microsomal triglyceride transfer protein at 60 and 150 ppm; however, these changes were not observed following the 6-month of exposure. Following the 3-month exposure, alanine transaminase and peroxisomal bifunctional proteins, known markers of liver injury and peroxisome proliferation, respectively, remained unaltered. Therefore, in the present study, the inhalation concentration range of 2EH induced a toxic hypertrophic change, revealing a limited role of peroxisome proliferator-activated receptor alpha (PPARα). The liver weights may have presumably increased via a mechanism independent of PPARα activation.
Collapse
Affiliation(s)
- Takanari Wakayama
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
- Department of Environmental Health, Nagoya City Public Health Research Institute, Japan
| | - Yuki Ito
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Mio Miyake
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Karin Nomasa
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Kiyoshi Sakai
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
- Department of Environmental Health, Nagoya City Public Health Research Institute, Japan
| | - Naoko Oya
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
- Research Fellow of Japan Society for the Promotion of Science, Japan
| | - Hirotaka Sato
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Hiroyuki Ohno
- Department of Environmental Health, Nagoya City Public Health Research Institute, Japan
| | - Michihiro Kamijima
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Japan
| |
Collapse
|
14
|
Hayakawa K, Kanai S, Funatsu T, Igarashi J, Jinnai B, Borders WA, Ohno H, Fukami S. Nanosecond Random Telegraph Noise in In-Plane Magnetic Tunnel Junctions. Phys Rev Lett 2021; 126:117202. [PMID: 33798384 DOI: 10.1103/physrevlett.126.117202] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 02/16/2021] [Indexed: 06/12/2023]
Abstract
We study the timescale of random telegraph noise (RTN) of nanomagnets in stochastic magnetic tunnel junctions (MTJs). From analytical and numerical calculations based on the Landau-Lifshitz-Gilbert and the Fokker-Planck equations, we reveal mechanisms governing the relaxation time of perpendicular easy-axis MTJs (p-MTJs) and in-plane easy-axis MTJs (i-MTJs), showing that i-MTJs can be made to have faster RTN. Superparamagnetic i-MTJs with small in-plane anisotropy and sizable perpendicular effective anisotropy show relaxation times down to 8 ns at negligible bias current, which is more than 5 orders of magnitude shorter than that of typical stochastic p-MTJs and about 100 times faster than the shortest time of i-MTJs reported so far. The findings give a new insight and foundation in developing stochastic MTJs for high-performance probabilistic computers.
Collapse
Affiliation(s)
- K Hayakawa
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
| | - S Kanai
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
- Division for the Establishment of Frontier Sciences, Organization for Advanced Studies, Tohoku University, Sendai 980-8577, Japan
- Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan
| | - T Funatsu
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
| | - J Igarashi
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
| | - B Jinnai
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - W A Borders
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
| | - H Ohno
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
- Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Center for Innovative Integrated Electronic Systems, Tohoku University, Sendai 980-0845, Japan
| | - S Fukami
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai 980-8577, Japan
- Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai 980-8577, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- Center for Innovative Integrated Electronic Systems, Tohoku University, Sendai 980-0845, Japan
| |
Collapse
|
15
|
Takeda K, Kusuoka R, Inukai M, Igarashi K, Ohno H, Nakamura N. An amperometric biosensor of L-fucose in urine for the first screening test of cancer. Biosens Bioelectron 2020; 174:112831. [PMID: 33288426 DOI: 10.1016/j.bios.2020.112831] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 09/15/2020] [Revised: 11/15/2020] [Accepted: 11/17/2020] [Indexed: 01/18/2023]
Abstract
Quantitative routine detection of fucose, which is a cancer marker, in urine is effective for the preliminary screening of cancer. Amperometric biosensing methods have the advantage of being simple, rapid, and precise for urinalysis. However, coexisting electroactive interferences such as ascorbic acid (AA), dopamine (DA), and uric acid (UA) prevent accurate measurements. In this work, an amperometric l-fucose biosensor unaffected by interferences was developed and utilizes direct electron transfer type bioelectrocatalysis of pyrroloquinoline quinone (PQQ)-dependent pyranose dehydrogenase from Coprinopsis cinerea (CcPDH). The isolated PQQ domain from CcPDH was immobilized on gold nanoparticle (AuNP)-modified electrodes, which obtained a catalytic current at a lower potential than the oxidation potential of the interfering compounds. Applying an operating potential of -0.1 V vs. Ag|AgCl (3 M NaCl) enabled the detection of l-fucose while completely eliminating the oxidation of AA, DA, and UA on the electrodes. The increase in the specific area of the electrodes by increasing the AuNP drop-casting time resulted in an improvement in the sensor performance. The biosensor exhibited a linear range for l-fucose detection between 0.1 mM and 1 mM (R2 = 0.9996), including a cut-off value, the sensitivity was 3.12 ± 0.05 μA mM-1 cm-2, and the detection limit was 13.6 μM at a signal-to-noise ratio of three. The biosensor can be used to quantify the concentration of l-fucose at physiological levels and does not require urine preprocessing, making it applicable to practical use for point-of-care testing with urine.
Collapse
Affiliation(s)
- Kouta Takeda
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Ryo Kusuoka
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Misaki Inukai
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Kiyohiko Igarashi
- Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan; Protein Discovery and Engineering Team, VTT Technical Research Center of Finland Ltd., FI-02044 VTT, Espoo, Finland
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan
| | - Nobuhumi Nakamura
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588, Japan.
| |
Collapse
|
16
|
DuttaGupta S, Kurenkov A, Tretiakov OA, Krishnaswamy G, Sala G, Krizakova V, Maccherozzi F, Dhesi SS, Gambardella P, Fukami S, Ohno H. Spin-orbit torque switching of an antiferromagnetic metallic heterostructure. Nat Commun 2020; 11:5715. [PMID: 33177506 PMCID: PMC7658218 DOI: 10.1038/s41467-020-19511-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [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: 03/16/2020] [Accepted: 10/14/2020] [Indexed: 11/09/2022] Open
Abstract
The ability to represent information using an antiferromagnetic material is attractive for future antiferromagnetic spintronic devices. Previous studies have focussed on the utilization of antiferromagnetic materials with biaxial magnetic anisotropy for electrical manipulation. A practical realization of these antiferromagnetic devices is limited by the requirement of material-specific constraints. Here, we demonstrate current-induced switching in a polycrystalline PtMn/Pt metallic heterostructure. A comparison of electrical transport measurements in PtMn with and without the Pt layer, corroborated by x-ray imaging, reveals reversible switching of the thermally-stable antiferromagnetic Néel vector by spin-orbit torques. The presented results demonstrate the potential of polycrystalline metals for antiferromagnetic spintronics.
Collapse
Affiliation(s)
- Samik DuttaGupta
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. .,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. .,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
| | - A Kurenkov
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Oleg A Tretiakov
- School of Physics, The University of New South Wales, Sydney, 2052, Australia
| | - G Krishnaswamy
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - G Sala
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - V Krizakova
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - F Maccherozzi
- Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - S S Dhesi
- Diamond Light Source, Chilton, Didcot, Oxfordshire, OX11 0DE, United Kingdom
| | - P Gambardella
- Laboratory for Magnetism and Interface Physics, Department of Materials, ETH Zurich, 8093, Zurich, Switzerland
| | - S Fukami
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-0845, Japan.,WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - H Ohno
- Center for Science and Innovation in Spintronics, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Spintronics Research Network, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.,Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aramaki Aza Aoba, Aoba-ku, Sendai, 980-0845, Japan.,WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| |
Collapse
|
17
|
Sakuragi H, Suzuki M, Ohno H. [Validation Study on Developed Methods for Total Organic Carbon in Some Kinds of Mineral Water]. Shokuhin Eiseigaku Zasshi 2020; 61:206-209. [PMID: 33132366 DOI: 10.3358/shokueishi.61.206] [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: 11/17/2022]
Abstract
Total organic carbon (TOC) was measured in some kinds of mineral water, and the method was validated. In mineral water, there are many kinds of elements such as carbon dioxide and a wide range of hardness. The official method for amount of TOC in tap water was validated in non-carbonated mineral water regardless of the degree of hardness. However, the amount of TOC was not accurately measured in two kinds of carbonated mineral water with medium or high degree of hardness. In our method of this study, the removal of carbon dioxide from the two kinds of mineral water was achieved by making bubbling time longer and additive rate of HCl upper than the official condition of tap water. And then, the method we developed was validated in the two kinds of mineral water. Our results suggested that the method we developed could be useful to measure the amount of TOC in many kinds of mineral water on the market.
Collapse
|
18
|
Tsurumaki A, Tajima M, Abe M, Sato D, Ohno H. Effect of the cation structure on cellulose dissolution in aqueous solutions of organic onium hydroxides. Phys Chem Chem Phys 2020; 22:22602-22608. [PMID: 33000814 DOI: 10.1039/d0cp03807e] [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: 12/13/2022]
Abstract
The solubility of cellulose was systematically assessed in organic onium/inium hydroxide aqueous solutions (OHAS) having assorted cations, such as phosphonium, ammonium, piperidinium, morpholinium, pyrrolidinium, and cholinium. From a dissolution test of cellulose in OHAS, it was confirmed that the single most important factor in the dissolution is the high concentration of OHAS. In addition, having a weaker hydrogen bond network around OH and H2O was found to be important to facilitate the cellulose dissolution. In NMR analysis, the OHAS with an excellent cellulose solubility, such as tetrabutylphosphonium hydroxide ([P4444]OH), exhibited a chemical shift of water (δH2O) integrated with that of OH in the low frequency region (∼4.9 ppm), while choline hydroxide ([Ch]OH) with poor cellulose solubility showed δH2O higher than 5.2 ppm. A higher δH2O means that the protons are deshielded due to a stronger hydrogen bond network around H2O and OH, which indicates a strong self-associating property of OHAS that is unfavourable for the cellulose dissolution. Assuming that the strong self-associating property can be reduced by improving the hydrophobicity of organic cations, the methyl group in N-butyl-N-methylmorpholinium hydroxide ([Mor14]OH) was replaced by a butyl chain to shield the positive charge. While [Mor14]OH dissolved only 5 wt% of cellulose, the solubility in the synthesised OHAS, N,N-dibutylmorpholinium hydroxide ([Mor44]OH), was successfully improved to 20 wt%. In the present paper, cellulose solubility was also analysed in relation to the Kamlet-Taft parameters.
Collapse
Affiliation(s)
- Akiko Tsurumaki
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
| | | | | | | | | |
Collapse
|
19
|
Ohno H, Kawamura Y. Analysis of Acrylonitrile, 1,3-Butadiene, and Related Compounds in Acrylonitrile-Butadiene-Styrene Copolymers for Kitchen Utensils and Children's Toys by Headspace Gas Chromatography/Mass Spectrometry. J AOAC Int 2019. [DOI: 10.1093/jaoac/93.6.1965] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Abstract
A headspace gas chromatography/mass spectrometry method was developed for the simultaneous determination of the residual levels of acrylonitrile (AN), 1,3-butadiene (1,3-BD), and their related compounds containing propionitrile (PN) and 4-vinyl-1-cyclohexene (4-VC) in acrylonitrilebutadiene-styrene (ABS) copolymers for kitchen utensils and children's toys. A sample was cut into small pieces, then N,N-dimethylacetamide and an internal standard were added in a sealed headspace vial. The vial was incubated for 1 h at 90C and the headspace gas was analyzed by gas chromatography/mass spectrometry. The recovery rates of the analytes were 93.3101.8 and the coefficients of variation were 0.36.5. In ABS copolymers, the levels were 0.350.4 g/g for AN, ND4.5 g/g for PN, 0.061.58 g/g for 1,3-BD, and 1.1295 g/g for 4-VC. The highest level was found for 4-VC, which is a dimer of 1,3-BD, and the next highest was for AN, which is one of the monomers of the ABS copolymer. Furthermore, the method was also applied to acrylonitrile-styrene (AS) copolymers and polystyrenes (PS) for kitchen utensils, and nitrile-butadiene rubber (NBR) gloves. In AS copolymers, AN and PN were detected at 16.854.5 and 0.86.9 g/g, respectively. On the other hand, the levels in PS and NBR samples were all low.
Collapse
Affiliation(s)
- Hiroyuki Ohno
- Nagoya City Public Health Research Institute, Environmental Health Department, 1-11, Hagiyama-cho, Mizuho-ku, Nagoya 467-8615, Japan
| | - Yoko Kawamura
- National Institute of Health Sciences, Division of Food Additives, 1-18-1, Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| |
Collapse
|
20
|
Ding HT, Hegde P, Kaczmarek O, Karsch F, Lahiri A, Li ST, Mukherjee S, Ohno H, Petreczky P, Schmidt C, Steinbrecher P. Chiral Phase Transition Temperature in (2+1)-Flavor QCD. Phys Rev Lett 2019; 123:062002. [PMID: 31491166 DOI: 10.1103/physrevlett.123.062002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Indexed: 06/10/2023]
Abstract
We present a lattice-QCD-based determination of the chiral phase transition temperature in QCD with two degenerate, massless quarks and a physical strange quark mass using lattice QCD calculations with the highly improved staggered quarks action. We propose and calculate two novel estimators for the chiral transition temperature for several values of the light quark masses, corresponding to Goldstone pion masses in the range of 58 MeV≲m_{π}≲163 MeV. The chiral phase transition temperature is determined by extrapolating to vanishing pion mass using universal scaling analysis. Finite-volume effects are controlled by extrapolating to the thermodynamic limit using spatial lattice extents in the range of 2.8-4.5 times the inverse of the pion mass. Continuum extrapolations are carried out by using three different values of the lattice cutoff, corresponding to lattices with temporal extents N_{τ}=6, 8, and 12. After thermodynamic, continuum, and chiral extrapolations, we find the chiral phase transition temperature T_{c}^{0}=132_{-6}^{+3} MeV.
Collapse
Affiliation(s)
- H-T Ding
- Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
| | - P Hegde
- Center for High Energy Physics, Indian Institute of Science, Bangalore 560012, India
| | - O Kaczmarek
- Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
- Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
| | - F Karsch
- Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Anirban Lahiri
- Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
| | - S-T Li
- Key Laboratory of Quark & Lepton Physics (MOE) and Institute of Particle Physics, Central China Normal University, Wuhan 430079, China
| | - Swagato Mukherjee
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - H Ohno
- Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
| | - P Petreczky
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - C Schmidt
- Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany
| | - P Steinbrecher
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| |
Collapse
|
21
|
Ikeda K, Fujita K, Ohno H, Nakamura N. Effects of charge balance and hydrophobicity of the surface of cytochrome c on the distribution behaviour in an ionic liquid/buffer biphasic system. Org Biomol Chem 2019; 17:7337-7341. [PMID: 31334530 DOI: 10.1039/c9ob00900k] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Factors contributing to the different distribution behaviour of cytochrome c were investigated in a biphasic tetrabutylphosphonium 2,4,6-trimethylbenzenesulfonate and potassium phosphate buffer system, which shows a lower critical solution temperature. To change charge balance and hydrophobicity of cytochrome c, surface modification with a few modifier molecules was applied. Surface charge and hydrophobicity affected the distribution behavior of chemically modified cytochrome c in the tetrabutylphosphonium 2,4,6-trimethylbenzenesulfonate and potassium phosphate buffer biphasic system. The distribution ratio into tetrabutylphosphonium 2,4,6-trimethylbenzenesulfonate decreased with decreasing isoelectric point of cytochrome c. Furthermore, cytochrome c possessing a low isoelectric point showed different distribution ratio depending on surface hydrophobicity. Taken together, these findings indicate that isoelectric point and surface hydrophobicity of cytochrome c are important factors controlling the distribution behavior in temperature sensitive biphasic systems.
Collapse
Affiliation(s)
- Kazuma Ikeda
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Koganei, Tokyo 184-8588, Japan
| | | | | | | |
Collapse
|
22
|
Tsurumaki A, Iwata T, Tokuda M, Minami H, Navarra MA, Ohno H. Polymerized ionic liquids as durable antistatic agents for polyether-based polyurethanes. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.031] [Citation(s) in RCA: 8] [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: 10/27/2022]
|
23
|
Wakayama T, Ito Y, Sakai K, Miyake M, Shibata E, Ohno H, Kamijima M. Comprehensive review of 2-ethyl-1-hexanol as an indoor air pollutant. J Occup Health 2019; 61:19-35. [PMID: 30698348 PMCID: PMC6499367 DOI: 10.1002/1348-9585.12017] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/02/2018] [Accepted: 10/10/2018] [Indexed: 11/12/2022] Open
Abstract
Objectives 2‐Ethyl‐1‐hexanol (2EH), a fragrance ingredient and a raw material for the production of plasticizer di(2‐ethylhexyl) phthalate, is responsible for sick building syndrome (SBS). This review aims to clarify the 2EH characteristics as an indoor air pollutant such as indoor air concentration, emission mechanism, toxicity, and clinical effects. Methods Scientific publications in English that has been made available on PubMed as of June 2018 and ad hoc publications in regional languages were reviewed. Results Inhalation exposure to 2EH caused mucous membrane irritation in the eyes, nose, and throat in experimental animals. Studies in human volunteers revealed an increase in olfactory irritation and eye discomfort. There has been increasing evidence of 2EH being present in indoor air in buildings. The primary sources of 2EH emissions are not building materials themselves, but instead the hydrolysis of plasticizers and flooring adhesives. In particular, compounds like di(2‐ethylhexyl) phthalate present in polyvinyl chloride flooring materials are hydrolyzed upon contact with alkaline moisture‐containing concrete floors. That being said, it may be observed that indoor concentrations of 2EH increased every year during summer. Conclusions Unlike other volatile organic compounds that cause SBS, 2EH can be retained in indoor air for long durations, increasing the likelihood of causing undesirable health effects in building occupants exposed to it. As a precautionary measure, it is important to use flooring materials that do not emit 2EH by hydrolysis, or to dry concrete before covering with flooring materials.
Collapse
Affiliation(s)
- Takanari Wakayama
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.,Department of Environmental Health, Nagoya City Public Health Research Institute, Nagoya, Japan
| | - Yuki Ito
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Kiyoshi Sakai
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan.,Department of Environmental Health, Nagoya City Public Health Research Institute, Nagoya, Japan
| | - Mio Miyake
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Eiji Shibata
- Department of Health and Psychosocial Medicine, Aichi Medical University School of Medicine, Nagakute, Japan
| | - Hiroyuki Ohno
- Department of Environmental Health, Nagoya City Public Health Research Institute, Nagoya, Japan
| | - Michihiro Kamijima
- Department of Occupational and Environmental Health, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| |
Collapse
|
24
|
Ohno H, Yoshizawa-Fujita M, Kohno Y. Functional Design of Ionic Liquids: Unprecedented Liquids that Contribute to Energy Technology, Bioscience, and Materials Sciences. BCSJ 2019. [DOI: 10.1246/bcsj.20180401] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Hiroyuki Ohno
- Tokyo University of Agriculture and Technology, 3-8-1 Harumi-cho, Fuchu, Tokyo 183-8538, Japan
| | - Masahiro Yoshizawa-Fujita
- Department of Materials and Life Sciences, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan
| | - Yuki Kohno
- National Institute of Advanced Industrial Science and Technology (AIST), 4-2-1 Nigatake, Miyagino-ku, Sendai, Miyagi 983-8551, Japan
| |
Collapse
|
25
|
Nitta A, Morita T, Ohno H, Nishikawa K. Fluctuations and Mixing State of an Aqueous Solution of the Ionic Liquid Tetrabutylphosphonium Trifluoroacetate around the Critical Point. Aust J Chem 2019. [DOI: 10.1071/ch18380] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Aqueous solutions of ionic liquids have unique mixing states. Fluctuations are useful for understanding the inhomogeneity of the mixing states. In this study, an aqueous solution of tetrabutylphosphonium trifluoroacetate, ([P4,4,4,4]CF3COO), which exhibits a lower-critical-solution-temperature-type phase transition, was investigated. Focussing on the concentration and temperature range near the critical point, the fluctuations were evaluated by combining three kinds of experimentally obtained data: small-angle X-ray scattering intensity, partial molar volumes, and isothermal compressibility. Using Kirkwood–Buff integrals, individual density fluctuations of water and [P4,4,4,4]CF3COO were calculated, and these suggested that a large number of water molecules hydrated [P4,4,4,4]CF3COO ion pairs, and the hydrated ion pairs aggregated near the critical point. The relationship between the mesoscopic fluctuations and the macroscopic phase transition was clarified by drawing counter maps of the fluctuations in the phase diagrams.
Collapse
|
26
|
Abstract
Ionic liquids have established themselves as promising soft compounds for bringing innovation to materials science. For further developing functions and abilities of ionic liquids, one of the most important challenges is to organize ionic liquids into dimensionally ordered states. In this feature article, we will present the organization of ionic liquids by endowing them with liquid-crystalline properties. In particular, focusing on the specific abilities and properties of functional ionic liquids, a variety of nanostructured ionic materials have been developed and their unique and enhanced functions have been revealed. Some potential uses of organized ionic liquids have also been mentioned.
Collapse
Affiliation(s)
- Takahiro Ichikawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588, Japan. and Functional Ionic Liquid Laboratories (FILL), Nakacho, Koganei, Tokyo 184-8588, Japan and JST, PRESTO, Honcho, Kawaguchi, Saitama, 332-0012, Japan
| | - Takashi Kato
- Department of Chemistry and Biotechnology, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588, Japan. and Functional Ionic Liquid Laboratories (FILL), Nakacho, Koganei, Tokyo 184-8588, Japan
| |
Collapse
|
27
|
Nikawa Y, Tsuzuki S, Ohno H, Fujita K. Hydration States of Cholinium Phosphate-Type Ionic Liquids as a Function of Water Content. Aust J Chem 2019. [DOI: 10.1071/ch18381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We investigated the hydration states of cholinium phosphate-type ionic liquids (ILs) in relation to ion structure, focusing on the influence of the hydroxyl group of the cation and the alkyl chain length of the anion. Water activity measurements provided information on the macroscopic hydration states of the hydrated ILs, while NMR measurements and molecular dynamics simulations clearly showed the microscopic interactions and coordination of the water molecules. The hydrogen bonding networks in these ILs were influenced by the anion structure and water content, and the mobility of water molecules was influenced by the number of hydroxyl groups in the cation and anion.
Collapse
|
28
|
Fujita K, Nakano R, Nakaba R, Nakamura N, Ohno H. Hydrated ionic liquids enable both solubilisation and refolding of aggregated concanavalin A. Chem Commun (Camb) 2019; 55:3578-3581. [DOI: 10.1039/c8cc10102g] [Citation(s) in RCA: 18] [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: 11/21/2022]
Abstract
Dissolution and refolding of aggregated concanavalin A were demonstrated in hydrated ionic liquids.
Collapse
Affiliation(s)
- Kyoko Fujita
- Department of Pathophysiology
- Tokyo University of Pharmacy and Life Sciences
- Tokyo
- Japan
| | - Roka Nakano
- Department of Biotechnology and Functional Ionic Liquid laboratories
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
| | - Risa Nakaba
- Department of Pathophysiology
- Tokyo University of Pharmacy and Life Sciences
- Tokyo
- Japan
| | - Nobuhumi Nakamura
- Department of Biotechnology and Functional Ionic Liquid laboratories
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
| | - Hiroyuki Ohno
- Department of Biotechnology and Functional Ionic Liquid laboratories
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
| |
Collapse
|
29
|
Tsurumaki A, Ohno H, Panero S, Navarra MA. Novel bis(fluorosulfonyl)imide-based and ether-functionalized ionic liquids for lithium batteries with improved cycling properties. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.09.205] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
30
|
Ohno H, Mutsuga M, Abe T, Abe Y, Amano H, Ishihara K, Ohsaka I, Ohno H, Ohno Y, Ozaki A, Kakihara Y, Kobayashi H, Sakuragi H, Shibata H, Shirono K, Sekido H, Takasaka N, Takenaka Y, Tajima Y, Tanaka A, Tanaka H, Tonooka H, Nakanishi T, Nomura C, Haneishi N, Hayakawa M, Miura T, Yamaguchi M, Watanabe K, Sato K. [Interlaboratory Study on Evaporation Residue Test for Food Contact Products (Report 1)]. Shokuhin Eiseigaku Zasshi 2018; 59:55-63. [PMID: 29743469 DOI: 10.3358/shokueishi.59.55] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An interlaboratory study was performed to evaluate the equivalence between an official method and a modified method of evaporation residue test using three food-simulating solvents (water, 4% acetic acid and 20% ethanol), based on the Japanese Food Sanitation Law for food contact products. Twenty-three laboratories participated, and tested the evaporation residues of nine test solutions as blind duplicates. For evaporation, a water bath was used in the official method, and a hot plate in the modified method. In most laboratories, the test solutions were heated until just prior to evaporation to dryness, and then allowed to dry under residual heat. Statistical analysis revealed that there was no significant difference between the two methods, regardless of the heating equipment used. Accordingly, the modified method provides performance equal to the official method, and is available as an alternative method.
Collapse
Affiliation(s)
| | | | | | | | - Homare Amano
- Nagano Environmental Conservation Research Institute
| | | | - Ikue Ohsaka
- Saitama Prefectural Institute of Public Health
| | - Haruka Ohno
- Aichi Prefectural Institute of Public Health
| | | | | | | | | | | | | | | | | | | | - Yu Takenaka
- Japan Recreation and Miscellaneous Goods Safety Laboratory
| | - Yoshiyasu Tajima
- Japan Inspection Association of Food and Food Industry Environment
| | | | - Hideyuki Tanaka
- National Institute of Advanced Industrial Science and Technology
| | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Ohno H, Mutsuga M, Abe T, Abe Y, Amano H, Ishihara K, Ohsaka I, Ohno H, Ohno Y, Ozaki A, Kakihara Y, Kobayashi H, Sakuragi H, Shibata H, Shirono K, Sekido H, Takasaka N, Takenaka Y, Tajima Y, Tanaka A, Tanaka H, Nakanishi T, Nomura C, Haneishi N, Hayakawa M, Miura T, Yamaguchi M, Yamada K, Watanabe K, Sato K. [Interlaboratory Study on Evaporation Residue Test for Food Contact Products (Report 2)]. Shokuhin Eiseigaku Zasshi 2018; 59:64-71. [PMID: 29743470 DOI: 10.3358/shokueishi.59.64] [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] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An interlaboratory study was performed to evaluate the equivalence between an official method and a modified method of evaporation residue test using heptane as a food-simulating solvent for oily or fatty foods, based on the Japanese Food Sanitation Law for food contact products. Twenty-three laboratories participated, and tested the evaporation residues of nine test solutions as blind duplicates. In the official method, heating for evaporation was done with a water bath. In the modified method, a hot plate was used for evaporation, and/or a vacuum concentration procedure was skipped. In most laboratories, the test solutions were heated until just prior to dryness, and then allowed to dry under residual heat. Statistical analysis revealed that there was no significant difference between the two methods. Accordingly, the modified method provides performance equal to the official method, and is available as an alternative method. Furthermore, an interlaboratory study was performed to evaluate and compare two leaching solutions (95% ethanol and isooctane) used as food-simulating solvents for oily or fatty foods in the EU. The results demonstrated that there was no significant difference between heptane and these two leaching solutions.
Collapse
Affiliation(s)
| | | | | | | | - Homare Amano
- Nagano Environmental Conservation Research Institute
| | | | - Ikue Ohsaka
- Saitama Prefectural Institute of Public Health
| | - Haruka Ohno
- Aichi Prefectural Institute of Public Health
| | | | | | | | | | | | | | | | | | | | - Yu Takenaka
- Japan Recreation and Miscellaneous Goods Safety Laboratory
| | - Yoshiyasu Tajima
- Japan Inspection Association of Food and Food Industry Environment
| | | | - Hideyuki Tanaka
- National Institute of Advanced Industrial Science and Technology
| | | | | | | | | | | | | | - Kyohei Yamada
- Saitama City Institute of Health Science and Research
| | | | | |
Collapse
|
32
|
Abstract
A zwitterion, an ion pair where cation and anion are covalently tethered, is known to be a type of salt. These ions have not been recognised as interesting, but they are physicochemically unique and fascinating ions. In the present review, some functional zwitterions derived from ionic liquids are mentioned to emphasise the usefulness of the tethering of the component cations and anions of ionic liquids. Basic properties, advantages and disadvantages after the functional design of zwitterions, and some applications are summarised.
Collapse
Affiliation(s)
- Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Naka-cho, Koganei 184-8588, Tokyo, Japan.
| | | | | |
Collapse
|
33
|
Ferreira AM, Passos H, Okafuji A, Tavares APM, Ohno H, Freire MG, Coutinho JAP. An integrated process for enzymatic catalysis allowing product recovery and enzyme reuse by applying thermoreversible aqueous biphasic systems. Green Chem 2018; 20:1218-1223. [PMID: 30271274 PMCID: PMC6161812 DOI: 10.1039/c7gc03880a] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Thermoreversible aqueous biphasic systems (ABS) composed of ammonium-based zwitterions (ZIs) and polymers are here disclosed to act as integrated bioreaction-separation processes. The biocatalytic reaction involving laccase occurs in homogeneous media, after which small changes in temperature induce the formation of two phases and the complete separation of the enzyme from the products in a single-step. These systems also allow the recover and reuse of the enzyme, along with the ZI-rich phase, contributing towards the development of sustainable biocatalytic processes.
Collapse
Affiliation(s)
- Ana M. Ferreira
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Helena Passos
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Akiyoshi Okafuji
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
| | - Ana P. M. Tavares
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
| | - Mara G. Freire
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - João A. P. Coutinho
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| |
Collapse
|
34
|
Kabir RS, Haramaki Y, Ki H, Ohno H. Self-Active Relaxation Therapy (SART) and Self-Regulation: A Comprehensive Review and Comparison of the Japanese Body Movement Approach. Front Hum Neurosci 2018; 12:21. [PMID: 29472851 PMCID: PMC5809433 DOI: 10.3389/fnhum.2018.00021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 01/15/2018] [Indexed: 11/13/2022] Open
Abstract
Relaxation programs are known for their versatility, cost-effectiveness, and ability to help people obtain skills to regulate their mental states and promote and maintain health. Self-Active Relaxation Therapy (SART) is a body-oriented approach to psychological rehabilitation that grew out of the suite of movement tasks developed in the Japanese psychotherapy known as Dohsa-hou, or the body movement method. The program for SART is designed to stretch, twist, and release areas of the upper, lower, and whole body through a set of movements which are guided by the practitioner and performed "self-actively" by the client to empower them to learn to recognize points of tension in the body and act on their own to achieve a relaxed state. Numerous studies have showed that SART is associated with reduced negative mood states and enhanced body awareness. A short version of SART has been investigated as a psychological support salon activity for the elderly, mothers raising children, special needs students, and children adapting to school. The full program has also been applied in clinical settings to address or supplement treatments for psychological and developmental conditions, and longitudinally employed in community contexts to assist residents facing long-term disaster recovery circumstances in Japan. This paper reviews the research and applications of SART as a bodymind approach by critically examining evidence and research gaps for future studies, comparing it with techniques established in the literature, and positing a self-regulatory framework for SART as a tool to become aware of bodily states, regulate mood, and manage stress through the deliberate practice of relaxation.
Collapse
Affiliation(s)
- Russell S Kabir
- Graduate School of Education, Hiroshima University, Higashihiroshima, Japan
| | - Yutaka Haramaki
- Department of Clinical Psychology, Hiroshima University, Higashihiroshima, Japan
| | - Hyeyoung Ki
- Department of Psychology, Fukuoka Jo Gakuin University, Fukuoka, Japan
| | - Hiroyuki Ohno
- Department of Clinical Psychology, Fukuoka Jo Gakuin University, Fukuoka, Japan
| |
Collapse
|
35
|
Fujita K, Kajiyama M, Liu Y, Nakamura N, Ohno H. Hydrated ionic liquids as a liquid chaperon for refolding of aggregated recombinant protein expressed in Escherichia coli. Chem Commun (Camb) 2018; 52:13491-13494. [PMID: 27801474 DOI: 10.1039/c6cc06999a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We have succeeded in refolding of aggregated recombinant protein from Escherichia coli in hydrated ionic liquids. In cholinium dihydrogen phosphate containing a limited amount of water molecules, aggregated solid cellulase was dissolved and refolding was successfully carried out without further processing.
Collapse
Affiliation(s)
- K Fujita
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan and Functional Ionic Liquid Laboratories (FILL), Graduate School of Engneering, Tokyo University of Agriculture and Technology, Japan
| | - M Kajiyama
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan and Functional Ionic Liquid Laboratories (FILL), Graduate School of Engneering, Tokyo University of Agriculture and Technology, Japan
| | - Y Liu
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan
| | - N Nakamura
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan and Functional Ionic Liquid Laboratories (FILL), Graduate School of Engneering, Tokyo University of Agriculture and Technology, Japan
| | - H Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan and Functional Ionic Liquid Laboratories (FILL), Graduate School of Engneering, Tokyo University of Agriculture and Technology, Japan
| |
Collapse
|
36
|
Ohno H, Tamura M, Kawakubo K, Gunji A, Kashihara H. Risk Factors for Ischemic Heart Disease in an Urban Area of Japan: A Case-Control Study in AMHTS. Methods Inf Med 2018. [DOI: 10.1055/s-0038-1634341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
AbstractObjectives: In Japan controversy exists as to whether or not the risk factors for ischemic heart disease (IHD) are the same as in western countries. We conducted a case-control study on IHD to clarify the risk factors in males in an urban area of Japan using our automated multiphasic health testing and services (AMHTS) system. Method: Cases were the clients who took the health check-up between January 1987 and July 1994 and had onset of IHD after the check-up. For each case five clients were selected as controls by conditional matching. The check-up data were compared between cases and controls 11 years, 6 years and just before the onset of the heart diseases. Results: The statistically significant items were as follows: (1) Eleven years before the onset: Total cholesterol (T-Chol) for myocardial infarction (MI), and fasting blood sugar (FBS) for angina pectoris (AP). (2) Six years before the onset: T-Chol, electrocardiographic (ECG) findings and the complaint of palpitation or breathlessness for MI, and FBS and palpitation or breathlessness for AP. (3) Just before the onset: T-Chol, the complaint of chest pain, FBS, smoking index and hypertensive status for MI and palpitation or breathlessness, ECG findings, chest pain, systolic blood pressure and erythrocyte sedimentation rate at 60 minutes for AP. In conclusion, the risk factors for MI in males in an urban area of Japan are the same as in western countries. The most significant risk factor for AP in males in an urban area of Japan is fasting blood sugar.
Collapse
|
37
|
Fujiwara S, Ohno H, Yoshio M, Kato T, Ichikawa T. Design of Dication-Type Amino Acid Ionic Liquids and Their Application to Self-Assembly Media of Amphiphiles. BCSJ 2018. [DOI: 10.1246/bcsj.20170276] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Saki Fujiwara
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
| | - Masafumi Yoshio
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0044
| | - Takashi Kato
- Department of Chemistry and Biotechnology, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656
| | - Takahiro Ichikawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo 184-8588
| |
Collapse
|
38
|
Okafuji A, Kohno Y, Nakamura N, Ohno H. Design of thermoresponsive poly(ionic liquid) gels containing proline units to catalyse aldol reaction in water. POLYMER 2018. [DOI: 10.1016/j.polymer.2017.11.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
39
|
Tsurumaki A, Ohno H. Dissolution of oligo(tetrafluoroethylene) and preparation of poly(tetrafluoroethylene)-based composites by using fluorinated ionic liquids. Chem Commun (Camb) 2018; 54:409-412. [DOI: 10.1039/c7cc08449h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Fluorinated ionic liquids form stable composites with poly(tetrafluoroethylene).
Collapse
Affiliation(s)
- Akiko Tsurumaki
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
- Functional Ionic Liquid Laboratories
| | - Hiroyuki Ohno
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
- Functional Ionic Liquid Laboratories
| |
Collapse
|
40
|
Ferreira AM, Passos H, Okafuji A, Freire MG, Coutinho JAP, Ohno H. Designing the thermal behaviour of aqueous biphasic systems composed of ammonium-based zwitterions. Green Chem 2017; 19:4012-4016. [PMID: 30271270 PMCID: PMC6157716 DOI: 10.1039/c7gc02262j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The ability of water-soluble ammonium-based zwitterions (ZIs) to form aqueous biphasic systems (ABS) in presence of salts aqueous solutions is here disclosed for the first time. These systems are thermoreversible at temperatures close to room temperature and further allow the design of their thermal behavior, from an upper critical solution temperature (UCST) to a lower critical solution temperature (LCST), by increasing the ZIs alkyl chains length. The investigated thermoreversible ABS are more versatile than typical liquid-liquid systems, and can be applied in a wide range of temperatures and compositions envisaging a target separation process.
Collapse
Affiliation(s)
- Ana M. Ferreira
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Helena Passos
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Akiyoshi Okafuji
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
| | - Mara G. Freire
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - João A. P. Coutinho
- CICECO – Aveiro Institute of Materials, Chemistry Department, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan
| |
Collapse
|
41
|
Konishi S, Yoshida H, Ohno H, Naruse Y, Coffin DO, Walthers CR, Binning KE. Experiments on a Ceramic Electrolysis Cell and a Palladium Diffuser at the Tritium Systems Test Assembly. ACTA ACUST UNITED AC 2017. [DOI: 10.13182/fst85-a24585] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- S. Konishi
- Japan Atomic Energy Research Institute Tokai-mura, Ibaraki-ken, Japan
| | - H. Yoshida
- Japan Atomic Energy Research Institute Tokai-mura, Ibaraki-ken, Japan
| | - H. Ohno
- Japan Atomic Energy Research Institute Tokai-mura, Ibaraki-ken, Japan
| | - Y. Naruse
- Japan Atomic Energy Research Institute Tokai-mura, Ibaraki-ken, Japan
| | - D. O. Coffin
- Los Alamos National Laboratory Los Alamos, NM 87545 (505)667-5868
| | - C. R. Walthers
- Los Alamos National Laboratory Los Alamos, NM 87545 (505)667-5868
| | - K. E. Binning
- Los Alamos National Laboratory Los Alamos, NM 87545 (505)667-5868
| |
Collapse
|
42
|
Ohno H, Nakagawa M, Kishimori C, Fukutsuka K, Honjo G. Cryptic t(3;8)(q27;q24) and/or MYC-BCL6 linkage associated with MYC expression by immunohistochemistry is frequent in multiple-hit B-cell lymphomas. Blood Cancer J 2017; 7:e578. [PMID: 28665415 PMCID: PMC5520406 DOI: 10.1038/bcj.2017.59] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- H Ohno
- Department of Hematology, Tenri Hospital, Tenri, Japan.,Tenri Institute of Medical Research, Tenri, Japan
| | - M Nakagawa
- Tenri Institute of Medical Research, Tenri, Japan
| | - C Kishimori
- Tenri Institute of Medical Research, Tenri, Japan
| | - K Fukutsuka
- Tenri Institute of Medical Research, Tenri, Japan
| | - G Honjo
- Department of Diagnostic Pathology, Tenri Hospital, Tenri, Japan
| |
Collapse
|
43
|
Navarra MA, Fujimura K, Sgambetterra M, Tsurumaki A, Panero S, Nakamura N, Ohno H, Scrosati B. New Ether-functionalized Morpholinium- and Piperidinium-based Ionic Liquids as Electrolyte Components in Lithium and Lithium-Ion Batteries. ChemSusChem 2017; 10:2496-2504. [PMID: 28407378 DOI: 10.1002/cssc.201700346] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2017] [Revised: 03/28/2017] [Indexed: 06/07/2023]
Abstract
Here, two ionic liquids, N-ethoxyethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide (M1,2O2 TFSI) and N-ethoxyethyl-N-methylpiperidinium bis(trifluoromethanesulfonyl)imide (P1,2O2 TFSI) were synthesized and compared. Fundamental relevant properties, such as thermal and electrochemical stability, density, and ionic conductivity were analyzed to evaluate the effects caused by the presence of the ether bond in the side chain and/or in the organic cation ring. Upon lithium salt addition, two electrolytes suitable for lithium batteries applications were found. Higher conducting properties of the piperidinium-based electrolyte resulted in enhanced cycling performances when tested with LiFePO4 (LFP) cathode in lithium cells. When mixing the P1,2O2 TFSI/LiTFSI electrolyte with a tailored alkyl carbonate mixture, the cycling performance of both Li and Li-ion cells greatly improved, with prolonged cyclability delivering very stable capacity values, as high as the theoretical one in the case of Li/LFP cell configurations.
Collapse
Affiliation(s)
- Maria Assunta Navarra
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Kanae Fujimura
- Functional Ionic Liquid Laboratories and Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Mirko Sgambetterra
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Akiko Tsurumaki
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
- Functional Ionic Liquid Laboratories and Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Stefania Panero
- Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro 5, 00185, Rome, Italy
| | - Nobuhumi Nakamura
- Functional Ionic Liquid Laboratories and Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Hiroyuki Ohno
- Functional Ionic Liquid Laboratories and Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Bruno Scrosati
- Istituto Italiano di Tecnologia, Via Morego, 30, 16163, Genova, Italy
| |
Collapse
|
44
|
Affiliation(s)
- Kosuke Kuroda
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
| | - Yuki Kohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
- Functional Ionic Liquid Laboratories, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588
| |
Collapse
|
45
|
Takahashi H, Fujita K, Ohno H. Dynamic Analysis of Adsorption-Desorption Equilibrium of Sublimed Aromatic Molecules Using Polarized Optical Waveguide Spectroscopy. ANAL SCI 2017; 33:465-467. [PMID: 28392521 DOI: 10.2116/analsci.33.465] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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
The adsorption-desorption equilibrium of sublimed molecules has been analyzed dynamically by optical waveguide (OWG) spectroscopy. Dynamic change of the transition moment during adsorption behavior was successfully detected using polarized incident light. With this technique, sublimed planer aromatic molecules, such as azobenzene, were revealed to stack parallel to the solid surface at the initial stage followed by adsorption with relatively random orientation.
Collapse
|
46
|
Sugimoto C, Takeda K, Kariya Y, Matsumura H, Yohda M, Ohno H, Nakamura N. A method of expression for an oxygen-tolerant group III alcohol dehydrogenase from Pyrococcus horikoshii OT3. J Biol Inorg Chem 2017; 22:527-534. [PMID: 28084552 DOI: 10.1007/s00775-017-1439-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 09/05/2016] [Accepted: 12/28/2016] [Indexed: 05/29/2023]
Abstract
NAD(P)-dependent group III alcohol dehydrogenases (ADHs), well known as iron-activated enzymes, generally lose their activities under aerobic conditions due to their oxygen-sensitivities. In this paper, we expressed an extremely thermostable group III ADH from the hyperthermophilic archaeon Pyrococcus horikoshii OT3 (PhADH) heterologously in Escherichia coli. When purified from a culture medium containing nickel, the recombinant PhADH (Ni-PhADH) contained 0.85 ± 0.01 g-atoms of nickel per subunit. Ni-PhADH retained high activity under aerobic conditions (9.80 U mg-1), while the enzyme expressed without adding nickel contained 0.46 ± 0.01 g-atoms of iron per subunit and showed little activity (0.27 U mg-1). In the presence of oxygen, the activity of the Fe2+-reconstituted PhADH prepared from the Ni-PhADH was gradually decreased, whereas the Ni2+-reconstituted PhADH maintained enzymatic activity. These results indicated that PhADH with bound nickel ion was stable in oxygen. The activity of the Ni2+-reconstituted PhADH prepared from the expression without adding nickel was significantly lower than that from the Ni-PhADH, suggesting that binding a nickel ion to PhADH in this expression system contributed to protecting against inactivation during the expression and purification processes. Unlike other thermophilic group III ADHs, Ni-PhADH showed high affinity for NAD(H) rather than NADP(H). Furthermore, it showed an unusually high k cat value toward aldehyde reduction. The activity of Ni-PhADH for butanal reduction was increased to 60.7 U mg-1 with increasing the temperature to 95 °C. These findings provide a new strategy to obtain oxygen-sensitive group III ADHs.
Collapse
Affiliation(s)
- Chikanobu Sugimoto
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Kouta Takeda
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Yumi Kariya
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Hirotoshi Matsumura
- Department of Life Science, Graduate School and Faculty of Engineering Science, Akita University, Akita, 010-8502, Japan
| | - Masafumi Yohda
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Nobuhumi Nakamura
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, Japan.
| |
Collapse
|
47
|
Nikawa Y, Fujita K, Ohno H. Quantitative assessment of kosmotropicity of hydrated ionic liquids by nuclear magnetic resonance. Phys Chem Chem Phys 2017; 19:8148-8151. [DOI: 10.1039/c6cp07463d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The NMR chemical shift variation of H2O varied with the component ion and reflected the kosmotropicity quantitatively in hydrated ionic liquids.
Collapse
Affiliation(s)
- Yohsuke Nikawa
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
| | - Kyoko Fujita
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
| | - Hiroyuki Ohno
- Department of Biotechnology
- Tokyo University of Agriculture and Technology
- Koganei
- Japan
- Functional Ionic Liquid Laboratories (FILL)
| |
Collapse
|
48
|
Abstract
A new class of hydrophobic and polar ionic liquids was prepared by coupling hydrophobic tetraoctylphosphonium cation and polar phosphonate-derived anions. Mixtures of these ionic liquids and water showed lower critical solution temperature-type phase behaviour. Furthermore, these mixtures displayed thermoreversible, however, non-linear viscosity change despite their large content of water. The abrupt increase in the viscosity was explained by the occurrence of rheopectic gelation of the ionic liquid/water mixtures by external stimuli such as shear stress.
Collapse
|
49
|
Kobayashi T, Ichikawa T, Kato T, Ohno H. Development of Glassy Bicontinuous Cubic Liquid Crystals for Solid Proton-Conductive Materials. Adv Mater 2017; 29:1604429. [PMID: 27882615 DOI: 10.1002/adma.201604429] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/27/2016] [Indexed: 06/06/2023]
Abstract
Glassy bicontinuous cubic liquid crystals are developed to be a matrix having a hydrophilic infinite periodic minimal surface (IPMS). They function as a scaffold for water, leading to the formation of a 3D continuous hydrogen-bonding network of water molecules along the IPMS. This material design is advantageous for developing novel electrolytes with rigidity and high proton conductivity.
Collapse
Affiliation(s)
- Tsubasa Kobayashi
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo, 184-8588, Japan
| | - Takahiro Ichikawa
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo, 184-8588, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, 332-0012, Japan
| | - Takashi Kato
- Department of Chemistry and Biotechnology, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Hiroyuki Ohno
- Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho, Koganei, Tokyo, 184-8588, Japan
| |
Collapse
|
50
|
Yamanaka S, Yoshioka K, Miyafuji H, Ohno H. Effect of Hydrogen Peroxide on the Extraction of Components of Cedar Powder with Tetrabutylphosphonium Hydroxide Aqueous Solution at 60°C. Aust J Chem 2017. [DOI: 10.1071/ch16454] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We successfully dissolved cedar powder with tetrabutylphosphonium hydroxide ([P4 4 4 4]OH) aqueous solution at 60°C. The dissolution was accelerated by the addition of H2O2. At the initial stage, cellulose was more soluble than hemicellulose and lignin. Both hemicellulose and lignin were gradually dissolved in this solution containing H2O2. Cellulose chains were revealed to be cut into shorter chains in this solution. The lignin network was also found to be partly broken at 60°C. These steps induced components with higher-molecular-weight fractions that cannot be extracted with polar ionic liquids to dissolve. Also, low-molecular-weight fractions such as vanillin and 5-(hydroxymethyl)furfural were found in the resulting solution. Breakage of ether bonds of polysaccharides and lignin and further oxidation were attributed to the active oxygens generated from H2O2. The aqueous mixture reported here is a protocol that can be used to dissolve woody biomass under mild conditions.
Collapse
|