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Hideki Kuramitz
Department of Environmental Biology and Chemistry, Graduate School of Science and Engineering for Research, University of Toyama, Gofuku, Toyama, Japan

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Journal article
Published: 27 July 2021 in Analytical Letters
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Here is presented a potential-scanning sensing technique for refractive index detection using a long-period fiber grating (LPFG) coated with indium tin oxide (ITO). The LPFG was produced by an electric arc-induced technique. The sensing is achieved by controlling the electron density of the ITO electrode by potential scanning. The attenuation peak of the LPFG in the transmittance spectra is shifted by the application of a potential. Therefore, a transmittance–potential spectrum with an attenuation peak is obtained during potential scanning, and the refractive index near the sensor can be determined from the peak potential at attenuation. The ITO-LPFG was successfully employed to experimentally perform potential-scanning for refractive index detection in sucrose solutions with concentrations between 0% and 33%. A sensor resolution of 0.0063 ΔRI and a sensitivity of 9.9 V/RIU were obtained using this approach. These values were improved using wavelengths that were experimentally shown to provide high sensitivity and refractive index linearity. A minimum sensor resolution of 0.0017 ΔRI and a maximum sensitivity of 26.7 V/RIU were obtained at 1136 nm. The measurements determined from the peak potential in this work were unaffected by variations in the initial light intensity for individual samples. In addition, this sensing approach can be employed in the near-infrared region and is capable of real-time and remote monitoring.

ACS Style

Takuya Okazaki; Tatsuya Orii; Shin-Yinn Tan; Tomoaki Watanabe; Akira Taguchi; Faidz A. Rahman; Hideki Kuramitz. Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG). Analytical Letters 2021, 1 -11.

AMA Style

Takuya Okazaki, Tatsuya Orii, Shin-Yinn Tan, Tomoaki Watanabe, Akira Taguchi, Faidz A. Rahman, Hideki Kuramitz. Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG). Analytical Letters. 2021; ():1-11.

Chicago/Turabian Style

Takuya Okazaki; Tatsuya Orii; Shin-Yinn Tan; Tomoaki Watanabe; Akira Taguchi; Faidz A. Rahman; Hideki Kuramitz. 2021. "Potential-Scanning Sensing for Refractive Index Using an Indium Tin Oxide (ITO)-Coated Long-Period Fiber Grating (LPFG)." Analytical Letters , no. : 1-11.

Research article
Published: 12 November 2020 in Environmental Science and Pollution Research
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Formaldehyde (HCHO) is a naturally occurring compound found in ambient air which can induce cancer and sick-building syndrome. It plays an important role in the formation of OH radicals, which are connected to the formation of various airborne chemicals. Herein, we present a simple modeling for the simulation of diurnal variations in the HCHO concentration of ambient air. This was achieved using data collected during different seasons from November 2015 to March 2017 at a suburban location in Toyama City (Japan), where non-methane hydrocarbon (NMHC) levels were low at sub carbon ppm (ppmC) order. The modeling was based on the assumption that photochemical reactions of methane were the major factor of secondary HCHO formation. The model took into account the production and decomposition of HCHO by photochemical reactions as well as its loss due to other reactions such as dry deposition. Accordingly, the model’s equation contained terms for solar radiation, temperature, and methane concentration. The results predicted using the model showed good agreement with the experimental data observed on fine days, i.e., except rainy, foggy, and heavily cloudy days. The relationships between HCHO concentration and solar radiation/temperature on different days as well as the seasonal variation of HCHO concentration were also interpreted by the proposed model. This study contributes to the evaluation of the pollution levels of formaldehyde. Moreover, the model may be used to demonstrate the impact of increasing methane levels, with regard to global warming and the background levels of HCHO in the atmosphere.

ACS Style

Shigeru Taguchi; Moe Hagiwara; Ayumi Shibata; Hiroaki Fujinari; Sayaka Matsumoto; Makoto Kuwata; Kazuto Sazawa; Noriko Hata; Hideki Kuramitz. Investigation and modeling of diurnal variation in suburban ambient formaldehyde concentration. Environmental Science and Pollution Research 2020, 28, 13425 -13438.

AMA Style

Shigeru Taguchi, Moe Hagiwara, Ayumi Shibata, Hiroaki Fujinari, Sayaka Matsumoto, Makoto Kuwata, Kazuto Sazawa, Noriko Hata, Hideki Kuramitz. Investigation and modeling of diurnal variation in suburban ambient formaldehyde concentration. Environmental Science and Pollution Research. 2020; 28 (11):13425-13438.

Chicago/Turabian Style

Shigeru Taguchi; Moe Hagiwara; Ayumi Shibata; Hiroaki Fujinari; Sayaka Matsumoto; Makoto Kuwata; Kazuto Sazawa; Noriko Hata; Hideki Kuramitz. 2020. "Investigation and modeling of diurnal variation in suburban ambient formaldehyde concentration." Environmental Science and Pollution Research 28, no. 11: 13425-13438.

Research article
Published: 17 August 2020 in Environmental Science and Pollution Research
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Dissolved humic substances (DHSs) are the major components of organic matter in the aquatic environment. DHSs are well known to considerably affect the speciation, solubility, and toxicity of a wide variety of pollutants in the aquatic environment. In this study, the effects of the toxicity of heavy metals and hydrophobic organic pollutants (HOPs) on Chlamydomonas reinhardtii in the presence of humic acid (HA) were examined by a microscale algal growth inhibition (μ-AGI) test based on spectrophotometric detection. To clarify the relationship between the chemical properties of HAs and the toxicity change of pollutants, eight HAs from different sources were prepared and used. HAs were responsible for mitigating the toxicity of Hg, Cu, pesticides (γ-HCH, 2,4-D, and DDT), and polycyclic aromatic hydrocarbons (PAHs) such as naphthalene (Nap), anthracene (Ant), and benzo[a]pyrene (BaP). In particular, an approximately 100-fold decrease in the toxicity of BaP was observed in the presence of 10 ppm HAs extracted from tropical peat. The results indicated that the carboxylic group content and the HA molecular weight are correlated to the changes in the heavy metal toxicity. For HOPs, the aromaticity and polarity of HAs are crucial for mitigating their toxicity. Furthermore, it was clearly shown that the lake water including a high concentration of DHSs collected from Central Kalimantan, Indonesia, reduced the toxicity of Hg and γ-HCH on Chlamydomonas reinhardtii. Graphical abstract

ACS Style

Yasuaki Nanayama; Kazuto Sazawa; Yustiawati Yustiawati; M. Suhaemi Syawal; Masami Fukushima; Hideki Kuramitz. Effect of humic acids on the toxicity of pollutants to Chlamydomonas reinhardtii: Investigation by a microscale algal growth inhibition test. Environmental Science and Pollution Research 2020, 28, 211 -219.

AMA Style

Yasuaki Nanayama, Kazuto Sazawa, Yustiawati Yustiawati, M. Suhaemi Syawal, Masami Fukushima, Hideki Kuramitz. Effect of humic acids on the toxicity of pollutants to Chlamydomonas reinhardtii: Investigation by a microscale algal growth inhibition test. Environmental Science and Pollution Research. 2020; 28 (1):211-219.

Chicago/Turabian Style

Yasuaki Nanayama; Kazuto Sazawa; Yustiawati Yustiawati; M. Suhaemi Syawal; Masami Fukushima; Hideki Kuramitz. 2020. "Effect of humic acids on the toxicity of pollutants to Chlamydomonas reinhardtii: Investigation by a microscale algal growth inhibition test." Environmental Science and Pollution Research 28, no. 1: 211-219.

Research article
Published: 19 June 2020 in Analytical Chemistry
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We present an electrochemical long period fiber grating (LPFG) sensor for electroactive species with an optically transparent electrode. The sensor was fabricated by coating indium tin oxide onto the surface of LPFG using a polygonal barrel-sputtering method. LPFG was produced by an electric arc-induced technique. The sensing is based on change in the detec-tion of electron density on the electrode surface during potential application and its reduction by electrochemical redox of analytes. Four typical electroactive species of methylene blue, hexaammineruthenium(III), ferrocyanide and ferrocenedi-methanol were used to investigate the sensor performance. The concentrations of analytes were determined by the modula-tion of the potential as the change in transmittance around the resonance band of LPFG. The sensitivity of the sensor, par-ticularly to methylene blue, was high, and the sensor responded to a wide concentration range of 0.001 mM to 1 mM.

ACS Style

Takuya Okazaki; Tatsuya Orii; Shin-Yinn Tan; Tomoaki Watanabe; Akira Taguchi; Faidz Abd Rahman; Hideki Kuramitz. Electrochemical long period fiber grating sensing for electroactive species. Analytical Chemistry 2020, 92, 1 .

AMA Style

Takuya Okazaki, Tatsuya Orii, Shin-Yinn Tan, Tomoaki Watanabe, Akira Taguchi, Faidz Abd Rahman, Hideki Kuramitz. Electrochemical long period fiber grating sensing for electroactive species. Analytical Chemistry. 2020; 92 (14):1.

Chicago/Turabian Style

Takuya Okazaki; Tatsuya Orii; Shin-Yinn Tan; Tomoaki Watanabe; Akira Taguchi; Faidz Abd Rahman; Hideki Kuramitz. 2020. "Electrochemical long period fiber grating sensing for electroactive species." Analytical Chemistry 92, no. 14: 1.

Journal article
Published: 14 May 2020 in Sensors
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Herein, we propose an evanescent-wave fiber optic sensing technique for the anionic dye uranine based on ion association extraction. The sensor was prepared by removing a section of the cladding from a multimode fiber and hydrophobization of the exposed core surface. Uranine was extracted in association along with hexadecyltrimethylammonium (CTA) ion onto the fiber surface and detected via absorption of the evanescent wave generated on the surface of the exposed fiber core. The effect of CTA+ concentration added for ion association was investigated, revealing that the absorbance of uranine increased with increasing CTA+ concentration. A change in the sensor response as a function of the added uranine concentration was clearly observed. The extraction data were analyzed using a distribution equilibrium model and a Freundlich isotherm. The uranine concentration in the evanescent field of the fiber optic was up to 54 times higher than that in the bulk solution, and the limit of detection (3σ) for uranine was found to be 1.3 nM.

ACS Style

Takuya Okazaki; Tomoaki Watanabe; Hideki Kuramitz. Evanescent-Wave Fiber Optic Sensing of the Anionic Dye Uranine Based on Ion Association Extraction. Sensors 2020, 20, 2796 .

AMA Style

Takuya Okazaki, Tomoaki Watanabe, Hideki Kuramitz. Evanescent-Wave Fiber Optic Sensing of the Anionic Dye Uranine Based on Ion Association Extraction. Sensors. 2020; 20 (10):2796.

Chicago/Turabian Style

Takuya Okazaki; Tomoaki Watanabe; Hideki Kuramitz. 2020. "Evanescent-Wave Fiber Optic Sensing of the Anionic Dye Uranine Based on Ion Association Extraction." Sensors 20, no. 10: 2796.

Journal article
Published: 08 April 2020 in Analytica Chimica Acta
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We designed an electrode that has the ability to sense a target cell. This new electrode is intended for use in cell recognition via electron-transfer and cross-linker peptide immobilization. Myelopeptide-4 (MP-4:FRPRIMTP) is a marrow-origin peptide that interacts with receptors of the human leukemia cell line (K562 cells), and allows their differentiation. The YYYYC electron-transfer peptide improves the electron-transfer accessibility from an electroactive compound to an electrode. Oligoalanine plays the role of a cross-linker that immobilizes a peptide series (Ac-FRPRIMTPYYYYCAAAAA) to collagen, which then allows it to be cast onto an electrode. Use of the electrode with a peptide increased the peak currents of [Fe(CN)6]4-/3- and also improved the reversibility of redox. These improvements are due to the interaction between [Fe(CN)6]4-/3- and the peptide. When electrochemical impedance spectroscopy (EIS) measurements were carried out using a collagen/peptide probe-immobilized electrode, the electron transfer resisitance was lower than that without the peptide. The detection of K562 cells was based on an increase in resistance, because MP-4 was bound to the receptors on the cell surface. The responses were linear and ranged in number from 27 to 2,000 cells/mLwith a detection limit of 8 cells/mL. Recoveries of 50 and 1,000 cells/mL in human serum were accomplished at rates of 98 and 101%, respectively. Consequently, the proposed procedure is a powerful new concept for cytosensing.

ACS Style

Kazuharu Sugawara; Sora Ishizaki; Keito Kodaira; Hideki Kuramitz; Toshihiko Kadoya. Fabrication of a cell-recognition/electron-transfer/cross-linker, peptide-immobilized electrode for the sensing of K562 cells. Analytica Chimica Acta 2020, 1116, 53 -61.

AMA Style

Kazuharu Sugawara, Sora Ishizaki, Keito Kodaira, Hideki Kuramitz, Toshihiko Kadoya. Fabrication of a cell-recognition/electron-transfer/cross-linker, peptide-immobilized electrode for the sensing of K562 cells. Analytica Chimica Acta. 2020; 1116 ():53-61.

Chicago/Turabian Style

Kazuharu Sugawara; Sora Ishizaki; Keito Kodaira; Hideki Kuramitz; Toshihiko Kadoya. 2020. "Fabrication of a cell-recognition/electron-transfer/cross-linker, peptide-immobilized electrode for the sensing of K562 cells." Analytica Chimica Acta 1116, no. : 53-61.

Sensors
Published: 28 February 2020 in Analytical Letters
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In the development of fiber optic sensors for monitoring scale formation in geothermal brine, high sensitivity and easy handling are desirable features. These characteristics have already been successfully enhanced for U-shaped sensors with other applications. In this work, U-shaped fiber optic sensors for scale formation are reported. The sensors were easily fabricated by bending the exposed core of a multimode fiber optic. Two types of fiber optics, i.e., a polymer cladding silica fiber and a hetero-core structure fiber, were used in preparing the U-shaped sensors. The percentage of total internal reflection between water and the fiber core is affected by the high refractive index of the CaCO3 scale formed on the surface. For laboratory measurements, the optical responses of the U-shaped fiber sensors with respect to calcium carbonate formation were investigated in a mixture of calcium chloride dehydrate and sodium hydrogen carbonate using a white-light source and a spectroscopic detector. The U-shaped fiber sensors were responsive to calcium carbonate formation on the sensor surface. Almost no change in the sensitivity was detected when comparing the U-shaped sensors with their straight counterparts. The transmittance changes were independent of the bending radius. Finally, the U-shaped polymer cladding fiber sensor was used to monitor the silica scale formation in geothermal brine at the Takigami geothermal plant.

ACS Style

Takuya Okazaki; Ryuichi Seto; Tomoaki Watanabe; Akira Ueda; Hideki Kuramitz. U-Shaped Polymer Cladding and Hetero-Core Fiber Optic Sensors for Monitoring Scale Formation in Geothermal Brine. Analytical Letters 2020, 53, 2160 -2169.

AMA Style

Takuya Okazaki, Ryuichi Seto, Tomoaki Watanabe, Akira Ueda, Hideki Kuramitz. U-Shaped Polymer Cladding and Hetero-Core Fiber Optic Sensors for Monitoring Scale Formation in Geothermal Brine. Analytical Letters. 2020; 53 (13):2160-2169.

Chicago/Turabian Style

Takuya Okazaki; Ryuichi Seto; Tomoaki Watanabe; Akira Ueda; Hideki Kuramitz. 2020. "U-Shaped Polymer Cladding and Hetero-Core Fiber Optic Sensors for Monitoring Scale Formation in Geothermal Brine." Analytical Letters 53, no. 13: 2160-2169.

Journal article
Published: 01 November 2019 in Remote Sensing of Environment
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ACS Style

Kazuto Sazawa; Kensuke Kawamura; Taisuke Yasuda; Hideki Kuramitz; Naoya Wada. Assessing the spatial dispersion of products of the fumarolic activity using remotely sensed snow color in an alpine environment. Remote Sensing of Environment 2019, 233, 1 .

AMA Style

Kazuto Sazawa, Kensuke Kawamura, Taisuke Yasuda, Hideki Kuramitz, Naoya Wada. Assessing the spatial dispersion of products of the fumarolic activity using remotely sensed snow color in an alpine environment. Remote Sensing of Environment. 2019; 233 ():1.

Chicago/Turabian Style

Kazuto Sazawa; Kensuke Kawamura; Taisuke Yasuda; Hideki Kuramitz; Naoya Wada. 2019. "Assessing the spatial dispersion of products of the fumarolic activity using remotely sensed snow color in an alpine environment." Remote Sensing of Environment 233, no. : 1.

Journal article
Published: 07 August 2019 in Electroanalysis
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ACS Style

Kazuharu Sugawara; Sora Ishizaki; Hideki Kuramitz; Toshihiko Kadoya. Electrochemical Sensing of Ovalbumin Based on the Interaction between Lysozyme Origin/Tyrosine‐rich Peptides Modified on Magnetic Beads and Oligothreonine/Ovalbumin‐origin Peptide. Electroanalysis 2019, 32, 207 -216.

AMA Style

Kazuharu Sugawara, Sora Ishizaki, Hideki Kuramitz, Toshihiko Kadoya. Electrochemical Sensing of Ovalbumin Based on the Interaction between Lysozyme Origin/Tyrosine‐rich Peptides Modified on Magnetic Beads and Oligothreonine/Ovalbumin‐origin Peptide. Electroanalysis. 2019; 32 (2):207-216.

Chicago/Turabian Style

Kazuharu Sugawara; Sora Ishizaki; Hideki Kuramitz; Toshihiko Kadoya. 2019. "Electrochemical Sensing of Ovalbumin Based on the Interaction between Lysozyme Origin/Tyrosine‐rich Peptides Modified on Magnetic Beads and Oligothreonine/Ovalbumin‐origin Peptide." Electroanalysis 32, no. 2: 207-216.

Journal article
Published: 24 July 2019 in Scientific Reports
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Treatment with an electromagnetic field, one of the potential techniques to inhibit scale deposition from water, has the advantage of not requiring the addition of any chemicals. Field tests using a fibre optic sensor were conducted to evaluate the effect that the treatment of hot spring water in Matsushiro, Japan with an electromagnetic field had on calcium carbonate scale formation. The optical response to scale deposition recorded by the fibre optic sensor decreased as a consequence of the application of an electromagnetic field, and the effectiveness of scale formation inhibition depended on the frequency of the electromagnetic field. This evidence was compared with results from changes in scale mass measured using the quartz crystal microbalance (QCM) method. Mass increases of the scale formed on the quartz crystal surface in hot spring water were inhibited by electromagnetic field treatment. These results were verified performing a column flow test, whereby the flow rate of hot spring water through a column was measured.

ACS Style

Takuya Okazaki; Senshin Umeki; Tatsuya Orii; Ryusuke Ikeya; Aya Sakaguchi; Takamichi Yamamoto; Tomoaki Watanabe; Akira Ueda; Hideki Kuramitz. Investigation of the effects of electromagnetic field treatment of hot spring water for scale inhibition using a fibre optic sensor. Scientific Reports 2019, 9, 1 -8.

AMA Style

Takuya Okazaki, Senshin Umeki, Tatsuya Orii, Ryusuke Ikeya, Aya Sakaguchi, Takamichi Yamamoto, Tomoaki Watanabe, Akira Ueda, Hideki Kuramitz. Investigation of the effects of electromagnetic field treatment of hot spring water for scale inhibition using a fibre optic sensor. Scientific Reports. 2019; 9 (1):1-8.

Chicago/Turabian Style

Takuya Okazaki; Senshin Umeki; Tatsuya Orii; Ryusuke Ikeya; Aya Sakaguchi; Takamichi Yamamoto; Tomoaki Watanabe; Akira Ueda; Hideki Kuramitz. 2019. "Investigation of the effects of electromagnetic field treatment of hot spring water for scale inhibition using a fibre optic sensor." Scientific Reports 9, no. 1: 1-8.

Journal article
Published: 10 July 2019 in Analytical Sciences
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ACS Style

Tomohiro Uchimura; Hideki Kuramitz; Takashi Tomiyasu. "Analytical Chemistry for Environmental Sciences". Analytical Sciences 2019, 35, 715 -715.

AMA Style

Tomohiro Uchimura, Hideki Kuramitz, Takashi Tomiyasu. "Analytical Chemistry for Environmental Sciences". Analytical Sciences. 2019; 35 (7):715-715.

Chicago/Turabian Style

Tomohiro Uchimura; Hideki Kuramitz; Takashi Tomiyasu. 2019. ""Analytical Chemistry for Environmental Sciences"." Analytical Sciences 35, no. 7: 715-715.

Journal article
Published: 02 July 2019 in Optik
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This paper presents the detection of mercury (II) ions based on a novel hybrid Long Period Fiber Grating (LPFG)-Diffusive Gradient in Thin Films (DGT) sensor system. The fundamental design of the hybrid sensor combines the features of a gold nanoparticles-coated LPFG embedded within a DGT structure. The main function of the DGT structure is to overcome the weakness of LPFG sensor by providing a durable housing for the protection of the fiber sensor, thereby allowing near real-time, in situ as well as long-term monitoring of mercury (II) ions in water. Experiments were conducted with mercury (II) solutions with concentrations ranging from 0.5 ppm to 10.0 ppm in order to study the sensing ability of the hybrid sensor. The performance of this hybrid sensor was then compared with an open structure sensor, in which the membrane filter and gel layers of DGT device were not included. Results showed that the response rate of the hybrid structure was lower than the open structure, i.e., 0.0049- and 0.0078-a.u./min, respectively in 2.0 ppm mercury (II) solution. This has proven that the presence of the structure of DGT has prolonged the movement of the mercury (II) ions towards the innermost Polyelectrolyte-Gold nanoparticles (PE-AuNP) coated LPFG sensor. Furthermore, the brittle LPFG sensor was well protected by the DGT structure. This mechanism makes the proposed LPFG-DGT sensor system suitable to be used for long-term and near real-time monitoring of water bodies due to the prolonged lifespan.

ACS Style

Shin-Yinn Tan; Sheng-Chyan Lee; Hideki Kuramitz; Faidz Abd-Rahman. A novel hybrid long period fiber grating-diffusive gradient in thin films sensor system for the detection of mercury (II) ions in water. Optik 2019, 194, 163040 .

AMA Style

Shin-Yinn Tan, Sheng-Chyan Lee, Hideki Kuramitz, Faidz Abd-Rahman. A novel hybrid long period fiber grating-diffusive gradient in thin films sensor system for the detection of mercury (II) ions in water. Optik. 2019; 194 ():163040.

Chicago/Turabian Style

Shin-Yinn Tan; Sheng-Chyan Lee; Hideki Kuramitz; Faidz Abd-Rahman. 2019. "A novel hybrid long period fiber grating-diffusive gradient in thin films sensor system for the detection of mercury (II) ions in water." Optik 194, no. : 163040.

Journal article
Published: 01 January 2019 in Journal of Water and Environment Technology
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Microcystin-LR (MC-LR) is one of the most frequent and most lethal toxicants and a vital environmental pollutant due to its toxicity and persistence. It is hepatotoxins and have been shown to be potent tumor-promoters which pose a serious threat to human health in the form of chronic exposure through drinking water. In this study, a novel electrochemical method for the determination of MC-LR has been developed using protein phosphatase 2A (PP2A) enzyme inhibition. The rapid and simple determination of PP2A activity was accomplished by means of hydrodynamic voltammetry in a 50 µL micro-droplet with a rotating disk electrode (RDE). The chronoamperometric response were obtained from the electrochemical oxidation of p-aminophenol (PAP) following the enzymatic conversion of p-aminophenyl phosphate (PAPP) as a substrate. PP2A activity estimated by using PAPP substrate is affected by MC-LR, and this phenomenon decreases the current signal of PAP. The IC50 value was calculated as 0.08 µg/L which is well below the World Health Organization (WHO) provisional guideline value for total MC-LR of 1 µg/L in drinking water. The enzymatic reaction using RDE is possible to perform using fewer chemicals in a rapid manner. Therefore, the method can be very attractive for MC contaminated drinking water routine assessment.

ACS Style

Saiful Islam; Kazuto Sazawa; Kazuharu Sugawara; Hideki Kuramitz. Micro-droplet Hydrodynamic Voltammetry for the Determination of Microcystin-LR Based on Protein Phosphatase. Journal of Water and Environment Technology 2019, 17, 18 -26.

AMA Style

Saiful Islam, Kazuto Sazawa, Kazuharu Sugawara, Hideki Kuramitz. Micro-droplet Hydrodynamic Voltammetry for the Determination of Microcystin-LR Based on Protein Phosphatase. Journal of Water and Environment Technology. 2019; 17 (1):18-26.

Chicago/Turabian Style

Saiful Islam; Kazuto Sazawa; Kazuharu Sugawara; Hideki Kuramitz. 2019. "Micro-droplet Hydrodynamic Voltammetry for the Determination of Microcystin-LR Based on Protein Phosphatase." Journal of Water and Environment Technology 17, no. 1: 18-26.

Journal article
Published: 10 December 2018 in Analytical Sciences
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ACS Style

Syeda Mushahida-Al-Noor; Ryo Murashima; Takuya Okazaki; Shigeru Taguchi; Hideki Kuramitz; Noriko Hata. Micro-organic Ion-associate Phase Extraction/micro-volume Back-extraction for the Preconcentration and GF-AAS Determination of Cadmium, Nickel and Lead in Environmental Water. Analytical Sciences 2018, 34, 1445 -1448.

AMA Style

Syeda Mushahida-Al-Noor, Ryo Murashima, Takuya Okazaki, Shigeru Taguchi, Hideki Kuramitz, Noriko Hata. Micro-organic Ion-associate Phase Extraction/micro-volume Back-extraction for the Preconcentration and GF-AAS Determination of Cadmium, Nickel and Lead in Environmental Water. Analytical Sciences. 2018; 34 (12):1445-1448.

Chicago/Turabian Style

Syeda Mushahida-Al-Noor; Ryo Murashima; Takuya Okazaki; Shigeru Taguchi; Hideki Kuramitz; Noriko Hata. 2018. "Micro-organic Ion-associate Phase Extraction/micro-volume Back-extraction for the Preconcentration and GF-AAS Determination of Cadmium, Nickel and Lead in Environmental Water." Analytical Sciences 34, no. 12: 1445-1448.

Original research paper
Published: 05 November 2018 in Analytical Letters
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A novel and simple method is proposed for the determination of tetracycline by adsorptive voltammetry in a droplet using a carbon nanotube paste rotating disk electrode (CNTP-RDE). An enhanced electrochemical oxidation response of tetracycline was observed in pH 8.2 supporting electrolyte by the addition of a long-chain cationic surfactant, such as benzyldimethyltetradecylammonium chloride (zephiramine). Under the optimized experimental conditions, the calibration curve was linear across a tetracycline concentration range from 1.0 × 10−7 to 2.0 × 10−6 M. The limit of detection and sensitivity were 4.0 × 10−8 M and 0.9358 A M−1, respectively. This method was successfully employed for the determination of tetracycline in milk samples.

ACS Style

Ayesha Sultana; Kazuto Sazawa; Saiful Islam; Kazuharu Sugawara; Hideki Kuramitz. Determination of Tetracycline by Microdroplet Hydrodynamic Adsorptive Voltammetry Using a Multiwalled Carbon Nanotube Paste Rotating Disk Electrode. Analytical Letters 2018, 52, 1153 -1164.

AMA Style

Ayesha Sultana, Kazuto Sazawa, Saiful Islam, Kazuharu Sugawara, Hideki Kuramitz. Determination of Tetracycline by Microdroplet Hydrodynamic Adsorptive Voltammetry Using a Multiwalled Carbon Nanotube Paste Rotating Disk Electrode. Analytical Letters. 2018; 52 (7):1153-1164.

Chicago/Turabian Style

Ayesha Sultana; Kazuto Sazawa; Saiful Islam; Kazuharu Sugawara; Hideki Kuramitz. 2018. "Determination of Tetracycline by Microdroplet Hydrodynamic Adsorptive Voltammetry Using a Multiwalled Carbon Nanotube Paste Rotating Disk Electrode." Analytical Letters 52, no. 7: 1153-1164.

Journal article
Published: 17 October 2018 in Review of Polarography
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Shunitz Tanaka; Kazuharu Sugawara; Hideki Kuramitz; Norifumi Terui. Development of Accumulation Voltammetry and Electrochemical Binding Assay using Labelled Ligands. Review of Polarography 2018, 64, 71 -78.

AMA Style

Shunitz Tanaka, Kazuharu Sugawara, Hideki Kuramitz, Norifumi Terui. Development of Accumulation Voltammetry and Electrochemical Binding Assay using Labelled Ligands. Review of Polarography. 2018; 64 (2):71-78.

Chicago/Turabian Style

Shunitz Tanaka; Kazuharu Sugawara; Hideki Kuramitz; Norifumi Terui. 2018. "Development of Accumulation Voltammetry and Electrochemical Binding Assay using Labelled Ligands." Review of Polarography 64, no. 2: 71-78.

Cover picture
Published: 09 October 2018 in Electroanalysis
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ACS Style

Ayesha Sultana; Kazuto Sazawa; Takuya Okazaki; Saiful Islam; Noriko Hata; Kazuharu Sugawara; Hideki Kuramitz. Cover Picture: Adsorptive Voltammetry for the Determination of Ochratoxin A Using Enrichment Effect by Cationic Surfactants (Electroanalysis 10/2018). Electroanalysis 2018, 30, 1 .

AMA Style

Ayesha Sultana, Kazuto Sazawa, Takuya Okazaki, Saiful Islam, Noriko Hata, Kazuharu Sugawara, Hideki Kuramitz. Cover Picture: Adsorptive Voltammetry for the Determination of Ochratoxin A Using Enrichment Effect by Cationic Surfactants (Electroanalysis 10/2018). Electroanalysis. 2018; 30 (10):1.

Chicago/Turabian Style

Ayesha Sultana; Kazuto Sazawa; Takuya Okazaki; Saiful Islam; Noriko Hata; Kazuharu Sugawara; Hideki Kuramitz. 2018. "Cover Picture: Adsorptive Voltammetry for the Determination of Ochratoxin A Using Enrichment Effect by Cationic Surfactants (Electroanalysis 10/2018)." Electroanalysis 30, no. 10: 1.

Research article
Published: 29 August 2018 in Environmental Science and Pollution Research
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Increases in global wildfires and fire severity are expected to result from global warming. Severe wildfires not only burn surface vegetation but also affect forest soil. Humic substances play key roles in the transport of nutrients and the carbon cycle in terrestrial ecosystems. In this study, we evaluated the effects of forest fires on the chemical properties of fulvic acid (FA) and humic acid (HA) extracted from non-burned and burned forest soils in Gunma, Japan. The differential thermal analysis of FA indicated that the intensity of exothermic reaction peak at 400 °C was 2-fold higher than that from non-burned soil. Based on pyrolysis-gas chromatography-mass spectrometry analysis with tetramethyl ammonium hydroxide, the amount of pyrolysate compounds in FA from burnt soil was significantly lower than that in FA from non-burnt soil. Therefore, we can conclude that the forest fire caused the significant change in the properties of FA such as increasing the aromaticity and refractory. In addition, the concentration of dissolved organic carbon with low molecular weight in surface soil increased after forest fire. This study suggests that the denaturation of soil organic matter by wildfire can affect the carbon cycle in terrestrial ecosystems.

ACS Style

Kazuto Sazawa; Hironori Yoshida; Katsuya Okusu; Noriko Hata; Hideki Kuramitz. Effects of forest fire on the properties of soil and humic substances extracted from forest soil in Gunma, Japan. Environmental Science and Pollution Research 2018, 25, 30325 -30338.

AMA Style

Kazuto Sazawa, Hironori Yoshida, Katsuya Okusu, Noriko Hata, Hideki Kuramitz. Effects of forest fire on the properties of soil and humic substances extracted from forest soil in Gunma, Japan. Environmental Science and Pollution Research. 2018; 25 (30):30325-30338.

Chicago/Turabian Style

Kazuto Sazawa; Hironori Yoshida; Katsuya Okusu; Noriko Hata; Hideki Kuramitz. 2018. "Effects of forest fire on the properties of soil and humic substances extracted from forest soil in Gunma, Japan." Environmental Science and Pollution Research 25, no. 30: 30325-30338.

Journal article
Published: 16 August 2018 in Analytica Chimica Acta
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We used an electron-transfer carbohydrate-mimetic peptide (YYYYC) to construct an electrochemical cytosensing system. Magnetic beads were modified with either asialofetuin (ASF) or soybean agglutinin (SBA) to evaluate the effect on cell sensing. Because SBA binds to the galactose residue that exists at the terminals of the carbohydrate chains in ASF, the target protein was accumulated on the protein magnetic beads. SBA is an example of N-acetylgalactosamine- and galactose-binding proteins that readily combine with YYYYC. When the peptides and protein-immobilized beads competed for a target protein, the peak current of the peptides changed according to the concentration of the protein at the 10-12 M level. Next, human myeloid leukemia cells (K562 cell) were measured using the peptide and the carbohydrate chains on the cell surface that recognize SBA. The electrode response was linear to the number of K562 cells and ranged from 1.0 × 102 to 5.0 × 103 cells mL-1. In addition, detection of a human liver cancer cell (HepG2 cell) was carried out using interactions with the peptide, the ASF receptors in HepG2 cells, and the carbohydrate chains of ASF. The peak currents were proportional and ranged between 5.0 × 101 and 1.5 × 103 cells mL-1. When the values estimated from an electrochemical process were compared with those obtained by ELISA, the results were within the acceptable range of measurement error.

ACS Style

Kazuharu Sugawara; Hideki Kuramitz; Toshihiko Kadoya. Label-free cytosensing of cancer cells based on the interaction between protein and an electron-transfer carbohydrate-mimetic peptide. Analytica Chimica Acta 2018, 1040, 166 -176.

AMA Style

Kazuharu Sugawara, Hideki Kuramitz, Toshihiko Kadoya. Label-free cytosensing of cancer cells based on the interaction between protein and an electron-transfer carbohydrate-mimetic peptide. Analytica Chimica Acta. 2018; 1040 ():166-176.

Chicago/Turabian Style

Kazuharu Sugawara; Hideki Kuramitz; Toshihiko Kadoya. 2018. "Label-free cytosensing of cancer cells based on the interaction between protein and an electron-transfer carbohydrate-mimetic peptide." Analytica Chimica Acta 1040, no. : 166-176.

Journal article
Published: 07 July 2018 in CATENA
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The objective of this study was to clarify what changes occurred in the amount and chemical properties of the soil organic matter (SOM) and dissolved organic matter (DOM) in the soil following isothermal incubation for 170 days. In this study, the soil samples were collected from coniferous and broadleaf forests in Toyama, Japan. The changes in the amount of carbon dioxide generation, the composition of the organic components of the SOM and its chemical properties during the incubation period were investigated. Likewise, DOM was extracted and examined for changes in chemical properties. For that purpose, pyrolysis-gas chromatography–mass spectrometry using tetramethylammonium hydroxide (TMAH-Py-GC/MS), absorption spectrophotometry, and fluorometry were used. From the amount of CO2 generated during incubation, it was found that 10%–15% of the SOM was mineralized. More CO2 was found to have been generated by the soil of the coniferous forests than by the soil of the broadleaf forests, probably because the former was more strongly affected by temperature changes. The DOM increased during the incubation period by day 55 and then sharply decreased. The absorption and fluorescence spectra showed that the DOM in the soil contained large amounts of humic substances after 97 days of incubation, which comprised organic compounds that did not readily decompose.

ACS Style

Hironori Yoshida; Kazuto Sazawa; Naoya Wada; Noriko Hata; Katsumi Marumo; Masami Fukushima; Hideki Kuramitz. Changes in the chemical composition of soil organic matter including water-soluble component during incubation: A case study of coniferous and broadleaf forest soils. CATENA 2018, 171, 22 -28.

AMA Style

Hironori Yoshida, Kazuto Sazawa, Naoya Wada, Noriko Hata, Katsumi Marumo, Masami Fukushima, Hideki Kuramitz. Changes in the chemical composition of soil organic matter including water-soluble component during incubation: A case study of coniferous and broadleaf forest soils. CATENA. 2018; 171 ():22-28.

Chicago/Turabian Style

Hironori Yoshida; Kazuto Sazawa; Naoya Wada; Noriko Hata; Katsumi Marumo; Masami Fukushima; Hideki Kuramitz. 2018. "Changes in the chemical composition of soil organic matter including water-soluble component during incubation: A case study of coniferous and broadleaf forest soils." CATENA 171, no. : 22-28.