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Tawakey SH, Mansour M, Soltan A, Salim AI. Early detection of hypo/hyperglycemia using a microneedle electrode array-based biosensor for glucose ultrasensitive monitoring in interstitial fluid. LAB ON A CHIP 2024; 24:3958-3972. [PMID: 39015046 DOI: 10.1039/d4lc00365a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
Diabetes is a common chronic metabolic disease with a wide range of clinical symptoms and consequences and one of the main causes of death. For the management of diabetes, painless and continuous interstitial fluid (ISF) glucose monitoring is ideal. Here, we demonstrate continuous diabetes monitoring using an integrated microneedle (MN) biosensor with an emergency alert system. MNs are a novel technique in the field of biomedical engineering because of their ability to analyze bioinformation with minimal invasion. In this work we developed a poly(methyl methacrylate) (PMMA) based MN glucose sensor. The device was produced by the 3D printing technique, microfabrication, electrodeposition, and enzyme immobilization step. The in vitro test for the glucose MN sensor showed a linear range from 1.5 to 14 mM with a sensitivity of 1.51 μA mM-1, limit of detection (LOD) of 0.35 mM and good selectivity. Highly repeatable sensing is observed with good reproducibility. The interference-free detection of glucose in the presence of physiologically relevant concentrations of ascorbic acid, uric acid, and mannose is demonstrated, along with the operational stability of the array. After resolving the biofouling consequences linked to on-body sensing, this MN platform would be appealing for minimally invasive electrochemical glucose monitoring. An alert is sent to confidants via email or SMS when the values are abnormal. The application is also able to display the recorded values in the form of a graph to help determine the state of health of the user over a period of time. It can be concluded that continuous monitoring and an emergency alert system are important for keeping an eye on diabetic patients and can send alert in case of an abnormal situation of the patient.
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Affiliation(s)
- Samar H Tawakey
- Nanoelectronics Integrated Systems Center (NISC), Nile University, 26th of July Corridor, Sheikh Zayed City, 12588, Giza, Egypt
- Chemistry Department, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Mohammad Mansour
- Nanoelectronics Integrated Systems Center (NISC), Nile University, 26th of July Corridor, Sheikh Zayed City, 12588, Giza, Egypt
| | - Ahmed Soltan
- Nanoelectronics Integrated Systems Center (NISC), Nile University, 26th of July Corridor, Sheikh Zayed City, 12588, Giza, Egypt
| | - Alyaa I Salim
- School of Biotechnology, Nile University, 26th of July Corridor, Sheikh Zayed City, 12588, Giza, Egypt.
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Bilal M, Degorska O, Szada D, Rybarczyk A, Zdarta A, Kaplon M, Zdarta J, Jesionowski T. Support Materials of Organic and Inorganic Origin as Platforms for Horseradish Peroxidase Immobilization: Comparison Study for High Stability and Activity Recovery. Molecules 2024; 29:710. [PMID: 38338454 PMCID: PMC10856027 DOI: 10.3390/molecules29030710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 02/12/2024] Open
Abstract
In the presented study, a variety of hybrid and single nanomaterials of various origins were tested as novel platforms for horseradish peroxidase immobilization. A thorough characterization was performed to establish the suitability of the support materials for immobilization, as well as the activity and stability retention of the biocatalysts, which were analyzed and discussed. The physicochemical characterization of the obtained systems proved successful enzyme deposition on all the presented materials. The immobilization of horseradish peroxidase on all the tested supports occurred with an efficiency above 70%. However, for multi-walled carbon nanotubes and hybrids made of chitosan, magnetic nanoparticles, and selenium ions, it reached up to 90%. For these materials, the immobilization yield exceeded 80%, resulting in high amounts of immobilized enzymes. The produced system showed the same optimal pH and temperature conditions as free enzymes; however, over a wider range of conditions, the immobilized enzymes showed activity of over 50%. Finally, a reusability study and storage stability tests showed that horseradish peroxidase immobilized on a hybrid made of chitosan, magnetic nanoparticles, and selenium ions retained around 80% of its initial activity after 10 repeated catalytic cycles and after 20 days of storage. Of all the tested materials, the most favorable for immobilization was the above-mentioned chitosan-based hybrid material. The selenium additive present in the discussed material gives it supplementary properties that increase the immobilization yield of the enzyme and improve enzyme stability. The obtained results confirm the applicability of these nanomaterials as useful platforms for enzyme immobilization in the contemplation of the structural stability of an enzyme and the high catalytic activity of fabricated biocatalysts.
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Affiliation(s)
- Muhammad Bilal
- Department of Sanitary Engineering, Faculty of Civil and Environmental Engineering, Gdansk University of Technology, G. Narutowicza 11/12, PL-80233 Gdansk, Poland
- Advanced Materials Center, Gdansk University of Technology, 11/12 Narutowicza, PL-80233 Gdansk, Poland
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Oliwia Degorska
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Daria Szada
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Agnieszka Rybarczyk
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Agata Zdarta
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Michal Kaplon
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Jakub Zdarta
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
| | - Teofil Jesionowski
- Institute of Chemical Technology and Engineering, Faculty of Chemical Technology, Poznan University of Technology, Berdychowo 4, PL-60965 Poznan, Poland; (O.D.); (D.S.); (A.Z.); (M.K.); (T.J.)
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Sardaremelli S, Hasanzadeh M, Seidi F. Enzymatic recognition of hydrogen peroxide (H 2 O 2 ) in human plasma samples using HRP immobilized on the surface of poly(arginine-toluidine blue)- Fe 3 O 4 nanoparticles modified polydopamine; A novel biosensor. J Mol Recognit 2021; 34:e2928. [PMID: 34378255 DOI: 10.1002/jmr.2928] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 07/15/2021] [Accepted: 07/16/2021] [Indexed: 12/16/2022]
Abstract
In this study, an innovative strategy was proposed for the electrocatalytical reduction and enzymatic biosensing of hydrogen peroxide (H2 O2 ) using chronoamperometry technique. For the first time, immobilization of horseradish peroxidase (HRP) in polydopamine-modified magnetic nanoparticles (PDA-MNPs) was successfully performed. Also, poly(l-arginine/toluidine blue) film-modified glassy carbon electrode was constructed through co-electropolymerization of l-arginine and toluidine blue on the surface of GCE using cyclic voltammetry technique. The engineered hybrid thin film provides strong functionalities for efficient grafting of PDA-MNPs which, in turn, enable the covalent immobilization of HRP. The proposed biosensor was used for the detection of H2 O2 in the range of 0.5-30 μM with a low limit of quantification 0.23 μM. It also was successfully applied for the investigation of hydrogen peroxide in human plasma samples.
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Affiliation(s)
- Sanam Sardaremelli
- Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, China.,Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Hasanzadeh
- Pharmaceutical Analysis Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Nutrition Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Farzad Seidi
- Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources and International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, China
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Singh M, Sahu A, Singh PK, Verma F, Rai A, Rai VK. A Novel Ternary Graphene‐based Nanocomposite Modified Electrode for Acetaminophen Detection. ELECTROANAL 2020. [DOI: 10.1002/elan.201900668] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Manorama Singh
- Department of ChemistryGuru Ghasidas Vishwavidyalaya Bilaspur CG-495009 INDIA
| | - Anjumala Sahu
- Department of ChemistryGuru Ghasidas Vishwavidyalaya Bilaspur CG-495009 INDIA
| | - Puneet K. Singh
- School of Physical SciencesJawaharlal Nehru University New Delhi 110067 INDIA
| | - Fooleswar Verma
- Department of ChemistryGuru Ghasidas Vishwavidyalaya Bilaspur CG-495009 INDIA
| | - Ankita Rai
- School of Physical SciencesJawaharlal Nehru University New Delhi 110067 INDIA
| | - Vijai K. Rai
- Department of ChemistryGuru Ghasidas Vishwavidyalaya Bilaspur CG-495009 INDIA
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A Sensitive Electrochemical Ascorbic Acid Sensor Using Glassy Carbon Electrode Modified by Molybdenite with Electrodeposited Methylene Blue. Appl Biochem Biotechnol 2020; 191:1533-1544. [PMID: 32152958 DOI: 10.1007/s12010-020-03255-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Accepted: 02/13/2020] [Indexed: 12/25/2022]
Abstract
A non-enzymatic amperometric sensor using natural molybdenite (MLN) electrodeposited with methylene blue (MB) has been fabricated and characterized and its analytical performances were investigated for the determination of ascorbic acid (AA). The surface morphology of the electrode modified by electrodeposited MB was studied by use of the Advanced Mineral Identification and Characterization System (AMICS) and laser confocal high-temperature scanning microscope (LCSM). The poly(MB) and MLN immobilized sensor showed good stability, reproducibility, sensitivity, and selectivity. It exhibited a linear performance range from 3 to 1000 μM, with a lower detection limit of 0.083 μM (signal/noise = 3) and short response time (< 5 s). No obvious decrease in the current was observed after 20 days storage. The methodology reproducibility of this sensor was 2.6%. It showed good anti-interference ability for the potential interfering compounds. The poly(MB) film not only can enhance the electron-transfer rate but also increase the lifetime of the sensor. This study demonstrated the applicability of natural molybdenite for the fabrication of non-enzymatic electrochemical AA sensor.
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Zhang Y, Zhang Y, Ma C, Wang Y, Mu S, Liu X, Zhang X, Zhang H. Molecularly imprinted gelatin nanoparticles for DNA delivery and in-situ fluorescence imaging of telomerase activity. Mikrochim Acta 2019; 186:610. [DOI: 10.1007/s00604-019-3671-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 07/06/2019] [Indexed: 12/15/2022]
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7
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Kosevich MV, Boryak OA, Shelkovsky VS, Zobnina VG, Orlov VV. Раrаdохical Sесоndаrу Emissiоn Mаss Sресtrum оf thе Lеuсо Fоrm оf Mеthуlеnе Bluе. JOURNAL OF ANALYTICAL CHEMISTRY 2019. [DOI: 10.1134/s1061934818140058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Singh M, Sahu A, Mahata S, Shukla P, Rai A, Rai VK. Efficient electrocatalytic oxidation of p-phenylenediamine using a novel PANI/ZnO anchored bio-reduced graphene oxide nanocomposite. NEW J CHEM 2019. [DOI: 10.1039/c9nj00837c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, a novel approach was reported for the fabrication of a polyaniline/ZnO-anchored bio-reduced graphene oxide nanocomposite for the efficient electrocatalytic oxidation of p-phenylenediamine.
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Affiliation(s)
- Manorama Singh
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | - Anjumala Sahu
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | - Suhasini Mahata
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | | | - Ankita Rai
- School of Physical Sciences
- Jawaharlal Nehru University
- India
| | - Vijai K. Rai
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
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9
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Singh M, Sahu A, Mahata S, Singh PK, Rai VK, Rai A. Efficient electrochemical determination of p-aminophenol using a novel tricomponent graphene-based nanocomposite. NEW J CHEM 2019. [DOI: 10.1039/c9nj03680f] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Design and synthesis of a gold nanoparticle@dithiooxamide functionalized graphene (AuNP@DFG) nanocomposite is reported herein, which is employed for the electrochemical determination of p-aminophenol successfully.
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Affiliation(s)
- Manorama Singh
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | - Anjumala Sahu
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | - Suhasini Mahata
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | | | - Vijai K. Rai
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495 009
- India
| | - Ankita Rai
- School of Physical Sciences
- Jawaharlal Nehru University
- India
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10
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Zouraris D, Zerva A, Topakas E, Karantonis A. Kinetic and amperometric study of the Mt PerII peroxidase isolated from the ascomycete fungus Myceliophthora thermophila. Bioelectrochemistry 2017; 118:19-24. [DOI: 10.1016/j.bioelechem.2017.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2017] [Revised: 06/21/2017] [Accepted: 06/27/2017] [Indexed: 02/08/2023]
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11
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Kashyap H, Singh PK, Verma F, Rai VK, Rai A, Singh M. Facile construction of AuNP modulated SDS-wrapped G-TC-tailored electrode for sensitive detection of ascorbic acid. NEW J CHEM 2017. [DOI: 10.1039/c7nj01032j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
AuNP modulated SDS wrapped G-TC electrode was fabricated for electrocatalytic oxidation of ascorbic acid with high sensitivity of 4017.0 μA mM−1. The LOD was calculated to be 0.07 μM and the sensor was investigated for determination of AcA in real sample (Vit. C tablets) with satisfactory results.
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Affiliation(s)
- Hemant Kashyap
- Department of Chemistry
- School of Physical Sciences
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495009
- India
| | - Puneet K. Singh
- School of Physical Science
- Jawaharlal Nehru University
- New Delhi-110027
- India
| | - Fooleswar Verma
- Department of Chemistry
- School of Physical Sciences
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495009
- India
| | - Vijai K. Rai
- Department of Chemistry
- School of Physical Sciences
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495009
- India
| | - Ankita Rai
- School of Physical Science
- Jawaharlal Nehru University
- New Delhi-110027
- India
| | - Manorama Singh
- Department of Chemistry
- School of Physical Sciences
- Guru Ghasidas Vishwavidyalaya
- Bilaspur-495009
- India
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Singh M, Bhardiya SR, Kashyap H, Verma F, Rai VK, Tiwari I. Decoration of GO with Fe spinel-Naf/DMAP: an electrochemical probe for sensing H2O2 reduction. RSC Adv 2016. [DOI: 10.1039/c6ra23409g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We herein report the preparation of graphene oxide decorated with Fe spinel (Fe3O4)-Naf/DMAP for an unprecedented and highly selective non-enzymatic electrochemical sensing of hydrogen peroxide.
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Affiliation(s)
- Manorama Singh
- Department of Chemistry
- School of Physical Sciences
- Bilaspur-495009
- India
| | - Smita R. Bhardiya
- Department of Chemistry
- School of Physical Sciences
- Bilaspur-495009
- India
| | - Hemant Kashyap
- Department of Chemistry
- School of Physical Sciences
- Bilaspur-495009
- India
| | - Fooleswar Verma
- Department of Chemistry
- School of Physical Sciences
- Bilaspur-495009
- India
| | - Vijai K. Rai
- Department of Chemistry
- School of Physical Sciences
- Bilaspur-495009
- India
| | - I. Tiwari
- Department of Chemistry
- Faculty of Science
- Banaras Hindu University
- Varanasi-221005
- India
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Prasad A, Kumar A, Suzuki M, Kikuchi H, Sugai T, Kobayashi M, Pospíšil P, Tada M, Kasai S. Detection of hydrogen peroxide in Photosystem II (PSII) using catalytic amperometric biosensor. FRONTIERS IN PLANT SCIENCE 2015; 6:862. [PMID: 26528319 PMCID: PMC4606053 DOI: 10.3389/fpls.2015.00862] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Accepted: 09/29/2015] [Indexed: 05/29/2023]
Abstract
Hydrogen peroxide (H2O2) is known to be generated in Photosystem II (PSII) via enzymatic and non-enzymatic pathways. Detection of H2O2 by different spectroscopic techniques has been explored, however its sensitive detection has always been a challenge in photosynthetic research. During the recent past, fluorescence probes such as Amplex Red (AR) has been used but is known to either lack specificity or limitation with respect to the minimum detection limit of H2O2. We have employed an electrochemical biosensor for real time monitoring of H2O2 generation at the level of sub-cellular organelles. The electrochemical biosensor comprises of counter electrode and working electrodes. The counter electrode is a platinum plate, while the working electrode is a mediator based catalytic amperometric biosensor device developed by the coating of a carbon electrode with osmium-horseradish peroxidase which acts as H2O2 detection sensor. In the current study, generation and kinetic behavior of H2O2 in PSII membranes have been studied under light illumination. Electrochemical detection of H2O2 using the catalytic amperometric biosensor device is claimed to serve as a promising technique for detection of H2O2 in photosynthetic cells and subcellular structures including PSII or thylakoid membranes. It can also provide a precise information on qualitative determination of H2O2 and thus can be widely used in photosynthetic research.
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Affiliation(s)
- Ankush Prasad
- Biomedical Engineering Research Center, Tohoku Institute of TechnologySendai, Japan
| | - Aditya Kumar
- Department of Biophysics, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký UniversityOlomouc, Czech Republic
| | - Makoto Suzuki
- Graduate Department of Environmental Information Engineering, Tohoku Institute of TechnologySendai, Japan
| | - Hiroyuki Kikuchi
- Graduate Department of Environmental Information Engineering, Tohoku Institute of TechnologySendai, Japan
| | - Tomoya Sugai
- Graduate Department of Environmental Information Engineering, Tohoku Institute of TechnologySendai, Japan
| | - Masaki Kobayashi
- Biomedical Engineering Research Center, Tohoku Institute of TechnologySendai, Japan
- Graduate Department of Electronics, Tohoku Institute of TechnologySendai, Japan
| | - Pavel Pospíšil
- Department of Biophysics, Faculty of Science, Centre of the Region Haná for Biotechnological and Agricultural Research, Palacký UniversityOlomouc, Czech Republic
| | - Mika Tada
- Biomedical Engineering Research Center, Tohoku Institute of TechnologySendai, Japan
- Center for General Education, Tohoku Institute of TechnologySendai, Japan
| | - Shigenobu Kasai
- Biomedical Engineering Research Center, Tohoku Institute of TechnologySendai, Japan
- Graduate Department of Environmental Information Engineering, Tohoku Institute of TechnologySendai, Japan
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Liu J, Wang T, Wang J, Wang E. Mussel-inspired biopolymer modified 3D graphene foam for enzyme immobilization and high performance biosensor. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.02.034] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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15
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Shelkovsky VS, Kosevich MV, Boryak OA, Chagovets VV, Shmigol IV, Pokrovskiy VA. Monomer/dimer dependent modulation of reduction of the cationic dye methylene blue in negatively charged nanolayers as revealed by mass spectrometry. RSC Adv 2014. [DOI: 10.1039/c4ra09592h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Mass spectrometric approach to differentiation of monomer or dimer form of cationic dye methylene blue adsorption at negatively charged nanolayers is proposed.
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Affiliation(s)
- Vadim S. Shelkovsky
- B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
- Kharkov, Ukraine
| | - Marina V. Kosevich
- B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
- Kharkov, Ukraine
| | - Oleg A. Boryak
- B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
- Kharkov, Ukraine
| | - Vitaliy V. Chagovets
- B.Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
- Kharkov, Ukraine
| | - Irina V. Shmigol
- Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine
- Kyiv, Ukraine
| | - Valerij A. Pokrovskiy
- Chuiko Institute of Surface Chemistry of the National Academy of Sciences of Ukraine
- Kyiv, Ukraine
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Pandey CM, Sharma A, Sumana G, Tiwari I, Malhotra BD. Cationic poly(lactic-co-glycolic acid) iron oxide microspheres for nucleic acid detection. NANOSCALE 2013; 5:3800-3807. [PMID: 23515585 DOI: 10.1039/c3nr34355c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Herein, we envisage the possibility of preparing stable cationic poly(lactic-co-glycolic acid) (PLGA) microspheres encapsulating the iron oxide nanoparticles (IONPs; 8-12 nm). The IONPs are incorporated into PLGA in organic phase followed by microsphere formation and chitosan coating in aqueous medium via nano-emulsion technique. The average size of the microspheres, as determined by dynamic light scattering are about 310 nm, while the zeta potential for the composite remains near 35 mV at pH 4.0. These microspheres are electrophoretically deposited onto indium tin oxide (ITO)-coated glass substrate used as cathode and parallel platinum plate as the counter electrode. This platform is utilized to fabricate a DNA biosensor, by immobilizing a probe sequence specific to Escherichia coli. The bioelectrode shows a surface-controlled electrode reaction with the electron transfer coefficient (α) of 0.64 and charge transfer rate constant (k(s)) of 61.73 s(-1). Under the optimal conditions, this biosensor shows a detection limit of 8.7 × 10(-14) M and is found to retain about 81% of the initial activity after 9 cycles of use.
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Affiliation(s)
- Chandra Mouli Pandey
- Biomedical Instrumentation Section, National Physical Laboratory (Council of Scientific & Industrial Research), New Delhi-110012, India
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Tiwari I, Gupta M, Sinha P, Aggarwal S. Electro-oxidation of phenyl hydrazine on a modified electrode constructed using nanocomposite of ruthenium terpyridyl complex, multiwalled carbon nanotubes and nafion. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.04.053] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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18
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Tiwari I, Singh KP. Composite materials based on ormosil for the construction of electrochemical sensors and biosensors. RUSS J GEN CHEM+ 2012. [DOI: 10.1134/s1070363212010264] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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