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Huang XL. Unveiling the role of inorganic nanoparticles in Earth's biochemical evolution through electron transfer dynamics. iScience 2024; 27:109555. [PMID: 38638571 PMCID: PMC11024932 DOI: 10.1016/j.isci.2024.109555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024] Open
Abstract
This article explores the intricate interplay between inorganic nanoparticles and Earth's biochemical history, with a focus on their electron transfer properties. It reveals how iron oxide and sulfide nanoparticles, as examples of inorganic nanoparticles, exhibit oxidoreductase activity similar to proteins. Termed "life fossil oxidoreductases," these inorganic enzymes influence redox reactions, detoxification processes, and nutrient cycling in early Earth environments. By emphasizing the structural configuration of nanoparticles and their electron conformation, including oxygen defects and metal vacancies, especially electron hopping, the article provides a foundation for understanding inorganic enzyme mechanisms. This approach, rooted in physics, underscores that life's origin and evolution are governed by electron transfer principles within the framework of chemical equilibrium. Today, these nanoparticles serve as vital biocatalysts in natural ecosystems, participating in critical reactions for ecosystem health. The research highlights their enduring impact on Earth's history, shaping ecosystems and interacting with protein metal centers through shared electron transfer dynamics, offering insights into early life processes and adaptations.
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Affiliation(s)
- Xiao-Lan Huang
- Center for Clean Water Technology, School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-6044, USA
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2
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Huang XL, Harmer JR, Schenk G, Southam G. Inorganic Fe-O and Fe-S oxidoreductases: paradigms for prebiotic chemistry and the evolution of enzymatic activity in biology. Front Chem 2024; 12:1349020. [PMID: 38389729 PMCID: PMC10881703 DOI: 10.3389/fchem.2024.1349020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 01/23/2024] [Indexed: 02/24/2024] Open
Abstract
Oxidoreductases play crucial roles in electron transfer during biological redox reactions. These reactions are not exclusive to protein-based biocatalysts; nano-size (<100 nm), fine-grained inorganic colloids, such as iron oxides and sulfides, also participate. These nanocolloids exhibit intrinsic redox activity and possess direct electron transfer capacities comparable to their biological counterparts. The unique metal ion architecture of these nanocolloids, including electron configurations, coordination environment, electron conductivity, and the ability to promote spontaneous electron hopping, contributes to their transfer capabilities. Nano-size inorganic colloids are believed to be among the earliest 'oxidoreductases' to have 'evolved' on early Earth, playing critical roles in biological systems. Representing a distinct type of biocatalysts alongside metalloproteins, these nanoparticles offer an early alternative to protein-based oxidoreductase activity. While the roles of inorganic nano-sized catalysts in current Earth ecosystems are intuitively significant, they remain poorly understood and underestimated. Their contribution to chemical reactions and biogeochemical cycles likely helped shape and maintain the balance of our planet's ecosystems. However, their potential applications in biomedical, agricultural, and environmental protection sectors have not been fully explored or exploited. This review examines the structure, properties, and mechanisms of such catalysts from a material's evolutionary standpoint, aiming to raise awareness of their potential to provide innovative solutions to some of Earth's sustainability challenges.
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Affiliation(s)
- Xiao-Lan Huang
- NYS Center for Clean Water Technology, School of Marine and Atmospheric Sciences, Stony Brook, NY, United States
| | - Jeffrey R Harmer
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Gerhard Schenk
- Australian Institute of Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia
- Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
| | - Gordon Southam
- Sustainable Minerals Institute, The University of Queensland, Brisbane, QLD, Australia
- School of the Environment, The University of Queensland, Brisbane, QLD, Australia
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3
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Ratautė K, Ratautas D. A Review from a Clinical Perspective: Recent Advances in Biosensors for the Detection of L-Amino Acids. BIOSENSORS 2023; 14:5. [PMID: 38248382 PMCID: PMC10813600 DOI: 10.3390/bios14010005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/14/2023] [Accepted: 12/19/2023] [Indexed: 01/23/2024]
Abstract
The field of biosensors is filled with reports and designs of various sensors, with the vast majority focusing on glucose sensing. However, in addition to glucose, there are many other important analytes that are worth investigating as well. In particular, L-amino acids appear as important diagnostic markers for a number of conditions. However, the progress in L-amino acid detection and the development of biosensors for L-amino acids are still somewhat insufficient. In recent years, the need to determine L-amino acids from clinical samples has risen. More clinical data appear to demonstrate that abnormal concentrations of L-amino acids are related to various clinical conditions such as inherited metabolic disorders, dyslipidemia, type 2 diabetes, muscle damage, etc. However, to this day, the diagnostic potential of L-amino acids is not yet fully established. Most likely, this is because of the difficulties in measuring L-amino acids, especially in human blood. In this review article, we extensively investigate the 'overlooked' L-amino acids. We review typical levels of amino acids present in human blood and broadly survey the importance of L-amino acids in most common conditions which can be monitored or diagnosed from changes in L-amino acids present in human blood. We also provide an overview of recent biosensors for L-amino acid monitoring and their advantages and disadvantages, with some other alternative methods for L-amino acid quantification, and finally we outline future perspectives related to the development of biosensing devices for L-amino acid monitoring.
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Affiliation(s)
- Kristina Ratautė
- Faculty of Medicine, Vilnius University, M. K. Čiurlionio Str. 21, LT-03101 Vilnius, Lithuania
| | - Dalius Ratautas
- Life Science Center, Vilnius University, Saulėtekio al. 7, LT-10257 Vilnius, Lithuania
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4
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Pipatwatcharadate C, Iyer PR, Pissuwan D. Recent Update Roles of Magnetic Nanoparticles in Circulating Tumor Cell (CTC)/Non-CTC Separation. Pharmaceutics 2023; 15:2482. [PMID: 37896242 PMCID: PMC10610106 DOI: 10.3390/pharmaceutics15102482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/04/2023] [Accepted: 10/09/2023] [Indexed: 10/29/2023] Open
Abstract
Metastasis of cancer is a major cause of death worldwide. Circulating tumor cells (CTCs) are important in the metastatic process of cancer. CTCs are able to circulate in the bloodstream. Therefore, they can be used as biomarkers of metastasis. However, CTCs are rare when compared to a large number of blood cells in the blood. Many CTC detection methods have been developed to increase CTC detection efficiency. Magnetic nanoparticles (MNPs) have attracted immense attention owing to their potential medical applications. They are particularly appealing as a tool for cell separation. Because of their unique properties, MNPs are of considerable interest for the enrichment of CTCs through CTC or non-CTC separation. Herein, we review recent developments in the application of MNPs to separate CTCs or non-CTCs in samples containing CTCs. This review provides information on new approaches that can be used to detect CTCs in blood samples. The combination of MNPs with other particles for magnetic-based cell separation for CTC detection is discussed. Furthermore, different approaches for synthesizing MNPs are included in this review.
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Affiliation(s)
- Chawapon Pipatwatcharadate
- Nanobiotechnology and Nanobiomaterials Research (N-BMR) Laboratory, School of Materials Science and Innovation, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (C.P.); (P.R.I.)
| | - Poornima Ramesh Iyer
- Nanobiotechnology and Nanobiomaterials Research (N-BMR) Laboratory, School of Materials Science and Innovation, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (C.P.); (P.R.I.)
- Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Dakrong Pissuwan
- Nanobiotechnology and Nanobiomaterials Research (N-BMR) Laboratory, School of Materials Science and Innovation, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; (C.P.); (P.R.I.)
- Materials Science and Engineering Program, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
- Center of Excellence on Medical Biotechnology (CEMB), Faculty of Science, Mahidol University, Bangkok 10400, Thailand
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Miškinis J, Ramonas E, Gurevičienė V, Razumienė J, Dagys M, Ratautas D. Capacitance-Based Biosensor for the Measurement of Total Loss of L-Amino Acids in Human Serum during Hemodialysis. ACS Sens 2022; 7:3352-3359. [PMID: 36268654 PMCID: PMC9706805 DOI: 10.1021/acssensors.2c01342] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In this paper, we present a biosensor based on a gold nanoparticle (AuNP)-modified Pt electrode with an adjusted membrane containing cross-linked L-amino acid oxidase for the detection and quantification of total L-amino acids. The designed biosensor was tested and characterized using the capacitance-based principle, capacitance measurements after electrode polarization, disconnection from the circuit, and addition of the respective amount of the analyte. The method was implemented using the capacitive and catalytic properties of the Pt/AuNP electrode; nanostructures were able to store electric charge while at the same time catalyzing the oxidation of the redox reaction intermediate H2O2. In this way, the Pt/AuNP layer was charged after the addition of analytes, allowing for much more accurate measurements for samples with low amino acid concentrations. The combined biosensor electrode with the capacitance-based measurement method resulted in high sensitivity and a low limit of detection (LOD) for hydrogen peroxide (4.15 μC/μM and 0.86 μM, respectively) and high sensitivity, a low LOD, and a wide linear range for L-amino acids (0.73 μC/μM, 5.5 μM and 25-1500 μM, respectively). The designed biosensor was applied to measure the relative loss of amino acids in patients undergoing renal replacement therapy by analyzing amino acid levels in diluted serum samples before and after entering/leaving the hemodialysis apparatus. In general, the designed biosensor in conjunction with the proposed capacitance-based method was clinically tested and could also be applied for the detection of other analytes using analyte-specific oxidases.
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Serapinas S, Gineitytė J, Butkevičius M, Danilevičius R, Dagys M, Ratautas D. Biosensor prototype for rapid detection and quantification of DNase activity. Biosens Bioelectron 2022; 213:114475. [PMID: 35714494 DOI: 10.1016/j.bios.2022.114475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 06/05/2022] [Accepted: 06/08/2022] [Indexed: 11/19/2022]
Abstract
DNases are enzymes that cleave phosphodiesteric bonds of deoxyribonucleic acid molecules and are found everywhere in nature, especially in bodily fluids, i.e., saliva, blood, or sweat. Rapid and sensitive detection of DNase activity is highly important for quality control in the pharmaceutical and biotechnology industries. For clinical diagnostics, recent reports indicate that increased DNase activity could be related to various diseases, such as cancers. In this paper, we report a new bioelectronic device for the determination of nuclease activity in various fluids. The system consists of a sensor electrode, a custom design DNA target to maximize the DNase cleavage rate, a signal analysis algorithm, and supporting electronics. The developed sensor enables the determination of DNase activity in the range of 3.4 × 10-4 - 3.0 × 10-2 U mL-1 with a limit of detection of up to 3.4 × 10-4 U mL-1. The sensor was tested by measuring nuclease activity in real human saliva samples and found to demonstrate high accuracy and reproducibility compared to the industry standard DNaseAlert™️. Finally, the entire detection system was implemented as a prototype device system utilizing single-use electrodes, custom-made cells, and electronics. The developed technology can improve nuclease quality control processes in the pharmaceutical/biotechnology industry and provide new insights into the importance of nucleases for medical applications.
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Affiliation(s)
- Skomantas Serapinas
- Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania; UAB "Laboratorija 1", Pamėnkalnio g. 36, LT-01114, Vilnius, Lithuania
| | - Justina Gineitytė
- Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania; UAB "Bioanalizės sistemos", Saulėtekio al. 15, LT-10224, Vilnius, Lithuania
| | - Marius Butkevičius
- Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania; UAB "Laboratorija 1", Pamėnkalnio g. 36, LT-01114, Vilnius, Lithuania
| | | | - Marius Dagys
- Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania; UAB "Bioanalizės sistemos", Saulėtekio al. 15, LT-10224, Vilnius, Lithuania
| | - Dalius Ratautas
- Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania; UAB "Bioanalizės sistemos", Saulėtekio al. 15, LT-10224, Vilnius, Lithuania.
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7
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Shafaat A, Žalnėravičius R, Ratautas D, Dagys M, Meškys R, Rutkienė R, Gonzalez-Martinez JF, Neilands J, Björklund S, Sotres J, Ruzgas T. Glucose-to-Resistor Transduction Integrated into a Radio-Frequency Antenna for Chip-less and Battery-less Wireless Sensing. ACS Sens 2022; 7:1222-1234. [PMID: 35392657 PMCID: PMC9040053 DOI: 10.1021/acssensors.2c00394] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
To maximize the potential of 5G infrastructure in healthcare, simple integration of biosensors with wireless tag antennas would be beneficial. This work introduces novel glucose-to-resistor transduction, which enables simple, wireless biosensor design. The biosensor was realized on a near-field communication tag antenna, where a sensing bioanode generated electrical current and electroreduced a nonconducting antenna material into an excellent conductor. For this, a part of the antenna was replaced by a Ag nanoparticle layer oxidized to high-resistance AgCl. The bioanode was based on Au nanoparticle-wired glucose dehydrogenase (GDH). The exposure of the cathode-bioanode to glucose solution resulted in GDH-catalyzed oxidation of glucose at the bioanode with a concomitant reduction of AgCl to highly conducting Ag on the cathode. The AgCl-to-Ag conversion strongly affected the impedance of the antenna circuit, allowing wireless detection of glucose. Mimicking the final application, the proposed wireless biosensor was ultimately evaluated through the measurement of glucose in whole blood, showing good agreement with the values obtained with a commercially available glucometer. This work, for the first time, demonstrates that making a part of the antenna from the AgCl layer allows achieving simple, chip-less, and battery-less wireless sensing of enzyme-catalyzed reduction reaction.
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Affiliation(s)
- Atefeh Shafaat
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö 205 06, Sweden
- Biofilms−Research Center for Biointerfaces, Malmö University, Malmö 205 06, Sweden
| | - Rokas Žalnėravičius
- State Research Institute, Centre for Physical Sciences and Technology, Saulėtekio av. 3, Vilnius LT-10257, Lithuania
| | - Dalius Ratautas
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Saulėtekio al. 7, Vilnius LT-10223, Lithuania
- Faculty of Fundamental Sciences, Vilnius Gediminas Technical University, Saulėtekio al. 11, Vilnius LT-10223, Lithuania
| | - Marius Dagys
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Saulėtekio al. 7, Vilnius LT-10223, Lithuania
| | - Rolandas Meškys
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Saulėtekio al. 7, Vilnius LT-10223, Lithuania
| | - Rasa Rutkienė
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Saulėtekio al. 7, Vilnius LT-10223, Lithuania
| | - Juan Francisco Gonzalez-Martinez
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö 205 06, Sweden
- Biofilms−Research Center for Biointerfaces, Malmö University, Malmö 205 06, Sweden
| | - Jessica Neilands
- Department of Oral Biology, Faculty of Odontology, Malmö University, Malmö 205 06, Sweden
| | - Sebastian Björklund
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö 205 06, Sweden
- Biofilms−Research Center for Biointerfaces, Malmö University, Malmö 205 06, Sweden
| | - Javier Sotres
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö 205 06, Sweden
- Biofilms−Research Center for Biointerfaces, Malmö University, Malmö 205 06, Sweden
| | - Tautgirdas Ruzgas
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, Malmö 205 06, Sweden
- Biofilms−Research Center for Biointerfaces, Malmö University, Malmö 205 06, Sweden
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8
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Ramonas E, Shafaat A, Dagys M, Ruzgas T, Ratautas D. Revising catalytic “acceleration” of enzymes on citrate-capped gold nanoparticles. J Catal 2021. [DOI: 10.1016/j.jcat.2021.10.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Reagentless D-Tagatose Biosensors Based on the Oriented Immobilization of Fructose Dehydrogenase onto Coated Gold Nanoparticles- or Reduced Graphene Oxide-Modified Surfaces: Application in a Prototype Bioreactor. BIOSENSORS 2021; 11:bios11110466. [PMID: 34821682 PMCID: PMC8615923 DOI: 10.3390/bios11110466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/17/2021] [Accepted: 11/18/2021] [Indexed: 11/21/2022]
Abstract
As electrode nanomaterials, thermally reduced graphene oxide (TRGO) and modified gold nanoparticles (AuNPs) were used to design bioelectrocatalytic systems for reliable D-tagatose monitoring in a long-acting bioreactor where the valuable sweetener D-tagatose was enzymatically produced from a dairy by-product D-galactose. For this goal D-fructose dehydrogenase (FDH) from Gluconobacter industrius immobilized on these electrode nanomaterials by forming three amperometric biosensors: AuNPs coated with 4-mercaptobenzoic acid (AuNP/4-MBA/FDH) or AuNPs coated with 4-aminothiophenol (AuNP/PATP/FDH) monolayer, and a layer of TRGO on graphite (TRGO/FDH) were created. The immobilized FDH due to changes in conformation and spatial orientation onto proposed electrode surfaces catalyzes a direct D-tagatose oxidation reaction. The highest sensitivity for D-tagatose of 0.03 ± 0.002 μA mM−1cm−2 was achieved using TRGO/FDH. The TRGO/FDH was applied in a prototype bioreactor for the quantitative evaluation of bioconversion of D-galactose into D-tagatose by L-arabinose isomerase. The correlation coefficient between two independent analyses of the bioconversion mixture: spectrophotometric and by the biosensor was 0.9974. The investigation of selectivity showed that the biosensor was not active towards D-galactose as a substrate. Operational stability of the biosensor indicated that detection of D-tagatose could be performed during six hours without loss of sensitivity.
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Teišerskytė V, Urbonavičius J, Ratautas D. A direct electron transfer formaldehyde dehydrogenase biosensor for the determination of formaldehyde in river water. Talanta 2021; 234:122657. [PMID: 34364466 DOI: 10.1016/j.talanta.2021.122657] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/21/2021] [Accepted: 06/23/2021] [Indexed: 01/31/2023]
Abstract
In this work, we report the construction of a direct electron transfer (DET) biosensor based on NAD-dependent formaldehyde dehydrogenase from Pseudomonas sp. (FDH) immobilized on the gold nanoparticle-modified gold electrode. To the best of our knowledge, a DET for FDH was achieved for the first time - the oxidation of formaldehyde started at a low electrode potential of -190 mV vs. Ag/AgCl and reached a maximum current density of 1100 nA cm-2 at 200 mV vs. Ag/AgCl. Also, the designed electrode was insensitive to substrate inhibition (in comparison to the free enzyme) and operated in solutions with formaldehyde concentrations up to 10 mM. The electrode was used and characterized as a mediatorless biosensor for the detection of formaldehyde. The biosensor demonstrated a limit of detection (0.05 mM), linear range from 0.25 to 2.0 mM, the sensitivity of 178.9 nA mM cm-2, high stability and selectivity. The biosensor has been successfully tested for the determination of added formaldehyde concentration in river water samples, thus the developed electrode could be applied for a fast, inexpensive and simple measurement of formaldehyde in various media.
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Affiliation(s)
- Viktorija Teišerskytė
- Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223, Vilnius, Lithuania
| | - Jaunius Urbonavičius
- Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223, Vilnius, Lithuania
| | - Dalius Ratautas
- Department of Chemistry and Bioengineering, Vilnius Gediminas Technical University, Saulėtekio al. 11, LT-10223, Vilnius, Lithuania; Institute of Biochemistry, Life Sciences Center, Vilnius University, Saulėtekio al. 7, LT-10257, Vilnius, Lithuania.
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11
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Paper-Based Competitive Immunochromatography Coupled with an Enzyme-Modified Electrode to Enable the Wireless Monitoring and Electrochemical Sensing of Cotinine in Urine. SENSORS 2021; 21:s21051659. [PMID: 33670868 PMCID: PMC7957614 DOI: 10.3390/s21051659] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 02/21/2021] [Accepted: 02/23/2021] [Indexed: 12/17/2022]
Abstract
This paper proposes a combined strategy of using paper-based competitive immunochromatography and a near field communication (NFC) tag for wireless cotinine determination. The glucose oxidase labeled cotinine antibody specifically binds free cotinine in a sample, whereas the unoccupied antibody attached to BSA-cotinine at the test line on a lateral flow strip. The glucose oxidase on the strip and an assistant pad in the presence of glucose generated H2O2 and imposed the Ag oxidation on the modified electrode. This enabled monitoring of immunoreaction by either electrochemical measurement or wireless detection. Wireless sensing was realized for cotinine in the range of 100-1000 ng/mL (R2 = 0.96) in PBS medium. Undiluted urine samples from non-smokers exhibited an Ag-oxidation rate three times higher than the smoker's urine samples. For 1:8 diluted urine samples (smokers), the proposed paper-based competitive immunochromatography coupled with an enzyme-modified electrode differentiated positive and negative samples and exhibited cotinine discrimination at levels higher than 12 ng/mL. This novel sensing platform can potentially be combined with a smartphone as a reader unit.
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12
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Bagdžiūnas G, Palinauskas D. Poly(9 H-carbazole) as a Organic Semiconductor for Enzymatic and Non-Enzymatic Glucose Sensors. BIOSENSORS 2020; 10:E104. [PMID: 32842552 PMCID: PMC7560144 DOI: 10.3390/bios10090104] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 08/07/2020] [Accepted: 08/21/2020] [Indexed: 02/05/2023]
Abstract
Organic semiconductors and conducting polymers are the most promising next-generation conducting materials for electrochemical biosensors as the greener and cheaper alternative for electrodes based on transition metals or their oxides. Therefore, polycarbazole as the organic semiconducting polymer was electrochemically synthesized and deposited on working electrode. Structure and semiconducting properties of polycarbazole have theoretically and experimentally been analyzed and proved. For these electrochemical systems, a maximal sensitivity of 14 μA·cm-2·mM-1, a wide linear range of detection up to 5 mM, and a minimal limit of detection of around 0.2 mM were achieved. Moreover, Michaelis's constant of these sensors depends not only on the enzyme but on the material of electrode and applied potential. The electrocatalytic mechanism and performance of the non- and enzymatic sensors based on this material as a conducting layer have been discussed by estimating pseudocapacitive and faradaic currents and by adding glucose as an analyte at the different applied potentials. In this work, the attention was focused on the electrochemical origin and mechanism involved in the non- and enzymatic oxidation and reduction of glucose.
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Affiliation(s)
- Gintautas Bagdžiūnas
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Sauletekio av. 7, LT-10257 Vilnius, Lithuania;
- Department of Functional Materials and Electronics, Center for Physical Sciences and Technology, Sauletekio av. 3, LT-10257 Vilnius, Lithuania
| | - Delianas Palinauskas
- Institute of Biochemistry, Life Sciences Centre, Vilnius University, Sauletekio av. 7, LT-10257 Vilnius, Lithuania;
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13
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Razumiene J, Gureviciene V, Sakinyte I, Rimsevicius L, Laurinavicius V. The Synergy of Thermally Reduced Graphene Oxide in Amperometric Urea Biosensor: Application for Medical Technologies. SENSORS 2020; 20:s20164496. [PMID: 32796728 PMCID: PMC7472232 DOI: 10.3390/s20164496] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/05/2020] [Accepted: 08/08/2020] [Indexed: 12/13/2022]
Abstract
Thermally reduced graphene oxide (TRGO) is a graphene-based nanomaterial that has been identified as promising for the development of amperometric biosensors. Urease, in combination with TRGO, allowed us to create a mediator-free amperometric biosensor with the intention of precise detection of urea in clinical trials. Beyond simplicity of the technology, the biosensor exhibited high sensitivity (2.3 ± 0.1 µA cm−2 mM−1), great operational and storage stabilities (up to seven months), and appropriate reproducibility (relative standard deviation (RSD) about 2%). The analytical recovery of the TRGO-based biosensor in urine of 101 ÷ 104% with RSD of 1.2 ÷ 1.7% and in blood of 92.7 ÷ 96.4%, RSD of 1.0 ÷ 2.5%, confirmed that the biosensor is acceptable and reliable. These properties allowed us to apply the biosensor in the monitoring of urea levels in samples of urine, blood, and spent dialysate collected during hemodialysis. Accuracy of the biosensor was validated by good correlation (R = 0.9898 and R = 0.9982) for dialysate and blood, utilizing approved methods. The advantages of the proposed biosensing technology could benefit the development of point-of-care and non-invasive medical instruments.
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Affiliation(s)
- Julija Razumiene
- Institute of Biochemistry, Life Science Center of Vilnius University, LT-10257 Vilnius, Lithuania; (V.G.); (I.S.); (V.L.)
- Correspondence:
| | - Vidute Gureviciene
- Institute of Biochemistry, Life Science Center of Vilnius University, LT-10257 Vilnius, Lithuania; (V.G.); (I.S.); (V.L.)
| | - Ieva Sakinyte
- Institute of Biochemistry, Life Science Center of Vilnius University, LT-10257 Vilnius, Lithuania; (V.G.); (I.S.); (V.L.)
| | - Laurynas Rimsevicius
- Institute of Clinical Medicine, Vilnius University, LT-08661 Vilnius, Lithuania;
| | - Valdas Laurinavicius
- Institute of Biochemistry, Life Science Center of Vilnius University, LT-10257 Vilnius, Lithuania; (V.G.); (I.S.); (V.L.)
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Real-time glucose monitoring system containing enzymatic sensor and enzymatic reference electrodes. Biosens Bioelectron 2020; 164:112338. [PMID: 32553347 DOI: 10.1016/j.bios.2020.112338] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 05/15/2020] [Accepted: 05/28/2020] [Indexed: 01/31/2023]
Abstract
Every electrochemical biosensor uses two or three electrode setup, which involves sensing electrode for a specific reaction, metal/salt reference electrode (i.e., Ag/AgCl or Hg/Hg2Cl2) for the control of the potential and, is some cases, counter electrode for the compensation of the current. This setup has significant flaws related to metal/salt reference electrodes: they are bulky and difficult to miniaturize, leak electrolyte to the medium, lose the ability to define the electrochemical potential precisely in time, consequently, have to be updated or replaced. This causes problems when the biosensor cannot be easily replaced (e.g., implanted electronics). Here we present a fully enzymatic real-time glucose monitoring system capable of referencing its own electrochemical potential. Using sensing electrode composed of wired glucose dehydrogenase and enzymatic reference electrode composed of wired laccase we have created a stable and accurate electrode system, which measured fluxes in concentration of glucose in a physiological range (3-8 mM), and demonstrated performance of the designed system in undiluted human serum. In addition, our designed enzymatic reference electrode is universal and may be applied for other biosensors, thus open possibilities for the new generation of implantable devices for healthcare monitoring.
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