1
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Chen R, Pathirathna P, Balla RJ, Kim J, Amemiya S. Nanoscale Quantitative Imaging of Single Nuclear Pore Complexes by Scanning Electrochemical Microscopy. Anal Chem 2024; 96:10765-10771. [PMID: 38904303 PMCID: PMC11223102 DOI: 10.1021/acs.analchem.4c01890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 05/24/2024] [Accepted: 05/28/2024] [Indexed: 06/22/2024]
Abstract
The nuclear pore complex (NPC) is a proteinaceous nanopore that solely and selectively regulates the molecular transport between the cytoplasm and nucleus of a eukaryotic cell. The ∼50 nm-diameter pore of the NPC perforates the double-membrane nuclear envelope to mediate both passive and facilitated molecular transport, thereby playing paramount biological and biomedical roles. Herein, we visualize single NPCs by scanning electrochemical microscopy (SECM). The high spatial resolution is accomplished by employing ∼25 nm-diameter ion-selective nanopipets to monitor the passive transport of tetrabutylammonium at individual NPCs. SECM images are quantitatively analyzed by employing the finite element method to confirm that this work represents the highest-resolution nanoscale SECM imaging of biological samples. Significantly, we apply the powerful imaging technique to address the long-debated origin of the central plug of the NPC. Nanoscale SECM imaging demonstrates that unplugged NPCs are more permeable to the small probe ion than are plugged NPCs. This result supports the hypothesis that the central plug is not an intrinsic transporter, but is an impermeable macromolecule, e.g., a ribonucleoprotein, trapped in the nanopore. Moreover, this result also supports the transport mechanism where the NPC is divided into the central pathway for RNA export and the peripheral pathway for protein import to efficiently mediate the bidirectional traffic.
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Affiliation(s)
- Ran Chen
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- School
of Chemistry and Chemical Engineering, Southeast
University, Nanjing 211189, China
| | - Pavithra Pathirathna
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Department
of Chemistry and Chemical Engineering, Florida
Institute of Technology, Melbourne, Florida 32901, United States
| | - Ryan J. Balla
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jiyeon Kim
- Department
of Chemistry, The University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Shigeru Amemiya
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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2
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Mattos GJ, Rothen JA, Tiuftiakov NY, Bakker E. Ion transfer mediated by TEMPO in ionophore-doped thin films for multi-ion sensing by cyclic voltammetry. Anal Chim Acta 2024; 1299:342388. [PMID: 38499432 DOI: 10.1016/j.aca.2024.342388] [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: 11/07/2023] [Revised: 01/25/2024] [Accepted: 02/19/2024] [Indexed: 03/20/2024]
Abstract
We report here on the development of thin-layer ion-selective membranes containing lipophilic TEMPO as a phase-transfer redox mediator for the simultaneous detection of non-redoxactive ions. This redox probe was recently introduced by our group and provides ideal ion-transfer waves when the membrane is interrogated by cyclic voltammetry. To perform multianalyte detection in the same sensing film, plasticized PVC-based membranes were doped with lithium and potassium ionophores in addition to a lipophilic cation-exchanger. The ionophores allow for ion discrimination owing to the different ionophore-cation complexation constants and the oxidation of TEMPO to the oxoammonium form results in the selective transfer of lithium and potassium at different potentials. The resulting voltammograms have half-peak widths of 100 and 102 mV, and the peak separation between anodic and cathodic scans is 8 and 9 mV for lithium and potassium, respectively, close to theoretical expectations. High peak resolution was observed, and the ion-transfer waves are still distinguishable when the ion activities differ by three orders of magnitude. These parameters are remarkably better than those obtained with other redox probes, which is important for multianalyte detection in the same voltammetric scan. Optimized membranes showed independent Nernstian shifts (slopes of 59.23 mV and 54.8 mV for K+ and Li+, respectively) of the peak position for increasing ion concentrations. An idealized model for two ionophore-based membranes combining redox and phase-boundary potentials was applied to the proposed system with excellent correlation. Potassium and lithium ions were simultaneously detected in undiluted human serum samples with good accuracy and precision.
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Affiliation(s)
- Gabriel J Mattos
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland
| | - Justine A Rothen
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland
| | - Nikolai Yu Tiuftiakov
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211, Geneva, Switzerland.
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3
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Huang SH, Parandhaman M, Farnia S, Kim J, Amemiya S. Nanoelectrochemistry at liquid/liquid interfaces for analytical, biological, and material applications. Chem Commun (Camb) 2023; 59:9575-9590. [PMID: 37458703 PMCID: PMC10416082 DOI: 10.1039/d3cc01982a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Herein, we feature our recent efforts toward the development and application of nanoelectrochemistry at liquid/liquid interfaces, which are also known as interfaces between two immiscible electrolyte solutions (ITIES). Nanopipets, nanopores, and nanoemulsions are developed to create the nanoscale ITIES for the quantitative electrochemical measurement of ion transfer, electron transfer, and molecular transport across the interface. The nanoscale ITIES serves as an electrochemical nanosensor to enable the selective detection of various ions and molecules as well as high-resolution chemical imaging based on scanning electrochemical microscopy. The powerful nanoelectroanalytical methods will be useful for biological and material applications as illustrated by in situ studies of solid-state nanopores, nuclear pore complexes, living bacteria, and advanced nanoemulsions. These studies provide unprecedented insights into the chemical reactivity of important biological and material systems even at the single nanostructure level.
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Affiliation(s)
- Siao-Han Huang
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
| | | | - Solaleh Farnia
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Jiyeon Kim
- Department of Chemistry, University of Rhode Island, Kingston, RI, 02881, USA.
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
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4
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Elangovan S, Puri SR, Madawala H, Pantano J, Pellock B, Kiesewetter MK, Kim J. Nanoscale Carbonate Ion-Selective Amperometric/Voltammetric Probes Based on Ion-Ionophore Recognition at the Organic/Water Interface: Hidden Pieces of the Puzzle in the Nanoscale Phase. Anal Chem 2023; 95:4271-4281. [PMID: 36808982 DOI: 10.1021/acs.analchem.2c02626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Here, we report on the successful demonstration and application of carbonate (CO32-) ion-selective amperometric/voltammetric nanoprobes based on facilitated ion transfer (IT) at the nanoscale interface between two immiscible electrolyte solutions. This electrochemical study reveals critical factors to govern CO32--selective nanoprobes using broadly available Simon-type ionophores forming a covalent bond with CO32-, i.e., slow dissolution of lipophilic ionophores in the organic phase, activation of hydrated ionophores, peculiar solubility of a hydrated ion-ionophore complex near the interface, and cleanness at the nanoscale interface. These factors are experimentally confirmed by nanopipet voltammetry, where a facilitated CO32- IT is studied with a nanopipet filled with an organic phase containing the trifluoroacetophenone derivative CO32-ionophore (CO32-ionophore VII) by voltammetrically and amperometrically sensing CO32- in water. Theoretical assessments of reproducible voltammetric data confirm that the dynamics of CO32- ionophore VII-facilitated ITs (FITs) follows the one-step electrochemical (E) mechanism controlled by both water-finger formation/dissociation and ion-ionophore complexation/dissociation during interfacial ITs. The yielded rate constant, k0 = 0.048 cm/s, is very similar to the reported values of other FIT reactions using ionophores forming non-covalent bonds with ions, implying that a weak binding between CO32- ion-ionophore enables us to observe FITs by fast nanopipet voltammetry regardless of the nature of bondings between the ion and ionophore. The analytical utility of CO32--selective amperometric nanoprobes is further demonstrated by measuring the CO32- concentration produced by metal-reducing bacteria Shewanella oneidensis MR-1 as a result of organic fuel oxidation in bacterial growth media in the presence of various interferents such as H2PO4-, Cl-, and SO42-.
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Affiliation(s)
- Subhashini Elangovan
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Surendra Raj Puri
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Hiranya Madawala
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Justin Pantano
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Brett Pellock
- Department of Biology, Providence College, Providence, Rhode Island 02981, United States
| | - Matthew K Kiesewetter
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
| | - Jiyeon Kim
- Department of Chemistry, University of Rhode Island, Kingston, Rhode Island 02881, United States
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5
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Han T, Song T, Bao Y, Sun Z, Ma Y, He Y, Gan S, Jiang D, Han D, Bobacka J, Niu L. Amperometric response of solid-contact ion-selective electrodes utilizing a two-compartment cell and a redox couple in solution. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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6
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Michalak M, Kałuża D, Michalska A, Maksymiuk K. Temperature triggered ion-selective membranes for non-zero current electrochemical ion sensors. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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7
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Kalisz J, Węgrzyn K, Michalska A, Maksymiuk K. Resolution increase of ion-selective electrodes response by using a reversed amperometric setup. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Ruangsuj P, Wanthongcharoen S, Chaisriratanakul W, Bunjongpru W, Yamprayoonswat W, Jeamsaksiri W, Jumpathong W, Yasawong M. Hybrid Plasticizers Enhance Specificity and Sensitivity of an Electrochemical-Based Sensor for Cadmium Detection. Int J Mol Sci 2022; 23:ijms23126402. [PMID: 35742849 PMCID: PMC9223680 DOI: 10.3390/ijms23126402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 05/17/2022] [Accepted: 05/20/2022] [Indexed: 02/01/2023] Open
Abstract
In addition to their use as an additive to improve physical properties of solvent polymeric membranes, plasticizers have a considerable impact on the specificity and sensitivity of membrane-modified electrochemical sensors. In this work, we aim at the hybridization of two different plasticizers using the electropolymerization technique in the development of a cadmium(II)-selective electrochemical sensor based on screen-printed gold electrode along with cyclic voltammetric measurement. At this point, we first screen for the primary plasticizer yielding the highest signal using cyclic voltammetry followed by pairing it with the secondary plasticizers giving rise to the most sensitive current response. The results show that the hybridization of DOS and TOTM with 3:1 weight ratio (~137.7-μm-thick membrane) renders a signal that is >26% higher than that from the sensor plasticized by DOS per se in water. The solution of 0.1 mM hydrochloric acid (pH 4) is the optimal supporting electrolyte. In addition, hybrid plasticizers have adequate redox capacity to induce cadmium(II) transfer from bulk solution to the membrane/water interfaces. Conversion of voltammetric signals to semi-integral currents results in linearity with cadmium(II) concentration, indicating the irreversible cadmium(II) transfer to the membrane. The DOS:TOTM hybrid sensor also exhibits high sensitivity, with a limit of detection (LOD) and limit of quantitation (LOQ) of 95 ppb and 288 ppb, respectively, as well as greater specificity towards cadmium(II) than that obtained from the single plasticizer sensor. Furthermore, recovery rates of spiked cadmium(II) in water samples were higher than 97% using the hybrid plasticizer sensor. Unprecedentedly, our work reports that the hybridization of plasticizers serves as ion-to-electron transducer that can improve the sensor performance in cadmium(II) detection.
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Affiliation(s)
- Pattarawan Ruangsuj
- Program on Environmental Toxicology, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok 10210, Thailand; (P.R.); (S.W.)
| | - Suwanan Wanthongcharoen
- Program on Environmental Toxicology, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok 10210, Thailand; (P.R.); (S.W.)
| | - Woraphan Chaisriratanakul
- Thai Microelectronics Center, National Science and Technology Development Agency (NSTDA), Chachoengsao 24000, Thailand; (W.C.); (W.B.); (W.J.)
| | - Win Bunjongpru
- Thai Microelectronics Center, National Science and Technology Development Agency (NSTDA), Chachoengsao 24000, Thailand; (W.C.); (W.B.); (W.J.)
| | - Wariya Yamprayoonswat
- Digital Agriculture Technology Research Team, Deputy Executive Director Research and Development Intelligent System and Networks, National Electronics and Computer Technology Center, National Science and Technology Development Agency, Pathum Thani 12120, Thailand;
| | - Wutthinan Jeamsaksiri
- Thai Microelectronics Center, National Science and Technology Development Agency (NSTDA), Chachoengsao 24000, Thailand; (W.C.); (W.B.); (W.J.)
| | - Watthanachai Jumpathong
- Program on Chemical Sciences, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok 10210, Thailand
- Correspondence: (W.J.); (M.Y.)
| | - Montri Yasawong
- Program on Environmental Toxicology, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, Bangkok 10210, Thailand; (P.R.); (S.W.)
- Center of Excellence on Environmental Health and Toxicology (EHT), Office of Higher Education, Bangkok 10210, Thailand
- Correspondence: (W.J.); (M.Y.)
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9
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Ma Y, Liu C, Wang L. Defined Ion-Transfer Voltammetry of a Single Microdroplet at a Polarized Liquid/Liquid Interface. Anal Chem 2022; 94:1850-1858. [PMID: 35023726 DOI: 10.1021/acs.analchem.1c04809] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A strategy for the fast analysis of ion transfer/facilitated ion transfer toward a tiny (femtoliter) water-in-oil droplet has been established. This scenario is embodied by the fusion of a w/o microdroplet at the micro liquid/liquid (L/L) interface, with the use of Fourier transform fast-scan cyclic voltammetry (FT-FSCV) to express the apparent half-wave potentials of anions or cations encapsulated inside the w/o microdroplet. First, the half-wave potential is in strict accordance with the transfer Gibbs free energy of either cations or anions. Second, the half-wave potential has been found to be positively proportional to the logarithmic concentration of ions, shedding thermodynamic insight into ion transfer. Third, as an instance of multivalent biopolymers, the transfer of protamine inside the single w/o microdroplet has been investigated. Obvious discrepancies in the behaviors of the fusion impacts at different pH, as well as in the absence and presence of the cationic surfactant DNNS-, are revealed. The internal mechanism of protamine transfer has been thoroughly investigated. This work proposes a strategy to sensitively and quickly determine the transfer Gibbs energy and the concentration of ions encapsulated in a single microdroplet, and it provides the possibility of analyzing the interfacial transfer properties of trace biomacromolecules inside an aqueous micro- or nanoscale droplet.
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Affiliation(s)
- Yamin Ma
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Cheng Liu
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China.,School of Chemistry, South China Normal University, Guangzhou 510006, China
| | - Lishi Wang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510641, China
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10
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Ahmed MMN, Bodowara FS, Zhou W, Penteado JF, Smeltz JL, Pathirathna P. Electrochemical detection of Cd(ii) ions in complex matrices with nanopipets. RSC Adv 2021; 12:1077-1083. [PMID: 35425143 PMCID: PMC8978973 DOI: 10.1039/d1ra07655h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 12/20/2021] [Indexed: 01/24/2023] Open
Abstract
Heavy metal contamination and its detrimental health effects are a growing concern globally. Several metal mitigation systems and regulatory approaches have been implemented to minimize the negative impacts on human health. However, none of these function at maximum efficiency, mainly due to the lack of accurate information about metal speciation. Therefore, there is a critical need to develop novel, cheap, efficient, and robust metal detecting sensors. In this study, we describe the application of a nanopipet based electrochemical sensor to detect aqueous Cd(ii) ions. The inner radius of our nanopipets is ∼300 nm, and the fundamental mechanism behind our sensor's response is ion transfer between two immiscible electrolyte solutions (ITIES). The absence of redox behavior makes ITIES an excellent, attractive electrochemical tool to study various ions in aqueous solutions. In this study, we used 1,10-phenanthroline as our ionophore in the organic phase (dichloroethane) to facilitate the transfer of Cd(ii) ions from the polar aqueous phase to the less polar organic phase. Unlike previous studies, we characterized our nanopipet in complicated matrices, including, but not limited to, tris buffer and artificial seawater. We performed quantitative assessments to determine our sensor's limit of detection, stability, sensitivity, and selectivity. We further show that our nanosensor can detect free Cd(ii) ions in the presence of strong complexing agents such as ethylenediaminetetraacetic acid, 2,3-dimercaptosuccinic acid, etc. We quantified the concentration of free Cd(ii) ions in a water sample collected from a local lagoon. Thus, we showcased the power of our nanopipets to act as a robust, accurate, and efficient speciation sensor to detect Cd(ii) ions in environmental samples.
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Affiliation(s)
- Muzammil M N Ahmed
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
| | - Faieza S Bodowara
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
| | - Wendy Zhou
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
| | - Juliana F Penteado
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
| | - Jessica L Smeltz
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
| | - Pavithra Pathirathna
- Department of Biomedical & Chemical Engineering & Sciences, Florida Institute of Technology 150 W. University Blvd Melbourne FL 32901 USA
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11
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Jetmore HD, Milton CB, Anupriya ES, Chen R, Xu K, Shen M. Detection of Acetylcholine at Nanoscale NPOE/Water Liquid/Liquid Interface Electrodes. Anal Chem 2021; 93:16535-16542. [PMID: 34846864 DOI: 10.1021/acs.analchem.1c03711] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interface between two immiscible electrolyte solutions (ITIES) has become a very powerful analytical platform for sensing a diverse range of chemicals (e.g., metal ions and neurotransmitters) with the advantage of being able to detect non-redox electroactive species. The ITIES is formed between organic and aqueous phases. Organic solvent identity is crucial to the detection characteristics of the ITIES [half-wave transfer potential (E1/2), potential window range, limit of detection, transfer coefficient (α), standard heterogeneous ion-transfer rate constant (k0), etc.]. Here, we demonstrated, for the first time at the nanoscale, the detection characteristics of the NPOE/water ITIES. Linear detection of the diffusion-limited current at different concentrations of acetylcholine (ACh) was demonstrated with cyclic voltammetry (CV) and i-t amperometry. The E1/2 of ACh transfer at the NPOE/water nanoITIES was -0.342 ± 0.009 V versus the E1/2 of tetrabutylammonium (TBA+). The limit of detection of ACh at the NPOE/water nanoITIES was 37.1 ± 1.5 μM for an electrode with a radius of ∼127 nm. We also determined the ion-transfer kinetics parameters, α and k0, of TBA+ at the NPOE/water nanoITIES by fitting theoretical cyclic voltammograms to experimental voltammograms. This work lays the basis for future cellular studies using ACh detection at the nanoscale and for studies to detect other analytes. The NPOE/water ITIES offers a potential window distinct from that of the 1,2-dichloroethane (DCE)/water ITIES. This unique potential window would offer the ability to detect analytes that are not easily detected at the DCE/water ITIES.
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Affiliation(s)
- Henry D Jetmore
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Conrad B Milton
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | | | - Ran Chen
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Kerui Xu
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
| | - Mei Shen
- The Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.,Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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12
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Kałuża D, Michalska A, Maksymiuk K. Solid‐Contact Ion‐Selective Electrodes Paving the Way for Improved Non‐Zero Current Sensors: A Minireview. ChemElectroChem 2021. [DOI: 10.1002/celc.202100892] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Dawid Kałuża
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Agata Michalska
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
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13
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Molina-Osorio AF, Wiorek A, Hussain G, Cuartero M, Crespo GA. Modelling electrochemical modulation of ion release in thin-layer samples. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Shishkanova TV, Bříza T, Řezanka P, Kejík Z, Jakubek M. Pentamethinium Salts Nanocomposite for Electrochemical Detection of Heparin. MATERIALS 2021; 14:ma14185357. [PMID: 34576581 PMCID: PMC8465147 DOI: 10.3390/ma14185357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/03/2021] [Accepted: 09/14/2021] [Indexed: 11/30/2022]
Abstract
This study presents a simple route to heparin detection and develops a voltammetric approach using supramolecular principles and nanomaterials. Nanocomposites, including gold nanoparticles (AuNPs) and γ-substituted pentamethinium salts (PMS) deposited on a glass carbon (GC) electrode surface (GC/AuNPs/PMS) and covered by a plasticized poly(vinyl chloride) (PVC) membrane, are proposed for heparin detection. The conductivity of the nonconducting PVC-plasticized membrane is guaranteed by AuNPs, and the selectivity is provided by the interaction between γ-substituted PMS and anionic analytes. In order to extend the linear range, it is necessary to apply a solvent compatible with PVC-plasticized membrane, namely tetrahydrofuran. The proposed voltammetric sensor showed a concentration dependence from 1.72 up to 45.02 IU mL−1 heparin and was used for heparin detection in saline and biological samples with recovery of 95.1–100.9%.
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Affiliation(s)
- Tatiana V. Shishkanova
- Department of Analytical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic; (P.Ř.); (M.J.)
- BIOCEV, First Faculty of Medicine, Charles University, Průmyslová 595, 252 50 Vestec, Czech Republic; (T.B.); (Z.K.)
- Correspondence:
| | - Tomáš Bříza
- BIOCEV, First Faculty of Medicine, Charles University, Průmyslová 595, 252 50 Vestec, Czech Republic; (T.B.); (Z.K.)
- Department of Paediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Kateřinská 1660/32, 121 08 Prague 2, Czech Republic
| | - Pavel Řezanka
- Department of Analytical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic; (P.Ř.); (M.J.)
| | - Zdeněk Kejík
- BIOCEV, First Faculty of Medicine, Charles University, Průmyslová 595, 252 50 Vestec, Czech Republic; (T.B.); (Z.K.)
- Department of Paediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Kateřinská 1660/32, 121 08 Prague 2, Czech Republic
| | - Milan Jakubek
- Department of Analytical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic; (P.Ř.); (M.J.)
- BIOCEV, First Faculty of Medicine, Charles University, Průmyslová 595, 252 50 Vestec, Czech Republic; (T.B.); (Z.K.)
- Department of Paediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Kateřinská 1660/32, 121 08 Prague 2, Czech Republic
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15
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Wu J, Dai J, Zhao Y, Li J, Ju M, Zhang X, Shen B. Sensitive Detection of Protamine Based on a Yellow Emission Fluorophore. ChemistrySelect 2021. [DOI: 10.1002/slct.202102354] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Jichun Wu
- School of Food Science and Pharmaceutical Engineering Nanjing Normal University No.1, Wenyuan road China
| | - Jianan Dai
- School of Food Science and Pharmaceutical Engineering Nanjing Normal University No.1, Wenyuan road China
| | - Yu Zhao
- Department of Food Science Cornell University Ithaca NY 14853 United States
| | - Jingmin Li
- School of Food Science and Pharmaceutical Engineering Nanjing Normal University No.1, Wenyuan road China
| | - Minzi Ju
- Department of Pharmacology Southeast University Nanjing Jiangsu 210009 China
| | - Xing Zhang
- School of Food Science and Pharmaceutical Engineering Nanjing Normal University No.1, Wenyuan road China
| | - Baoxing Shen
- School of Food Science and Pharmaceutical Engineering Nanjing Normal University No.1, Wenyuan road China
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16
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Light-driven ion extraction of polymeric membranes for on-demand Cu(II) sensing. Anal Chim Acta 2021; 1176:338756. [PMID: 34399898 DOI: 10.1016/j.aca.2021.338756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/26/2021] [Accepted: 06/11/2021] [Indexed: 11/21/2022]
Abstract
The modulation of the ion-fluxes across a polymeric membrane is important for designing attractive methodologies. As an alternative to the commonly used dynamic electrochemistry approaches, light can be used as an external stimulus and provides a very convenient way to manipulate ions release and/or extraction into a polymeric membrane. Herein, we designed a solid-contact polymeric membrane ion-selective sensor that exhibits dynamic response by light irradiation at 375 nm. The electrode membrane contains a light-sensitive lipophilic salt (bis(4-tert-butylphenyl)iodonium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (R+-R-, BTDT-TFPB) instead of traditional ion exchanger. Under light illumination, the decomposition of the lipophilic cation makes the membrane with ion-exchange properties. The solid-contact ion-selective electrodes based on potentiometry and constant potential coulometry have been explored for direct ion sensing. Copper was selected as a mode analyte and can be determined at micromole levels. The proposed dynamic ion sensors show promise for on-demand ion sensing.
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17
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Rostampour M, Bailey B, Autrey C, Ferrer K, Vantoorenburg B, Patel PK, Calvo-Marzal P, Chumbimuni-Torres KY. Single-Step Integration of Poly(3-Octylthiophene) and Single-Walled Carbon Nanotubes for Highly Reproducible Paper-Based Ion-Selective Electrodes. Anal Chem 2021; 93:1271-1276. [PMID: 33372767 DOI: 10.1021/acs.analchem.0c04506] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Calibration of ion-selective electrodes (ISEs) is cumbersome, time-consuming, and constitutes a significant limitation for the development of single-use and wearable disposable sensors. To address this problem, we have studied the effect of ion-selective membrane solvent on ISE reproducibility by comparing tetrahydrofuran (THF) (a typical solvent for membrane preparation) and cyclohexanone. In addition, a single-step integration of semiconducting/transducer polymer poly(3-octylthiophene) (POT) with single-walled carbon nanotubes (SWCNTs) into the paper-based ISEs (PBISEs) substrate was introduced. PBISEs for potassium and sodium ions were developed, and these ISEs present outstanding sensor performance and high potential reproducibility, as low as ±1.0 mV (n = 3).
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Affiliation(s)
- Mohammad Rostampour
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Brian Bailey
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Cody Autrey
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Karla Ferrer
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Brooke Vantoorenburg
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Parth K Patel
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
| | - Percy Calvo-Marzal
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816-2366, United States
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18
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Mao C, Yuan D, Wang L, Bakker E. Separating boundary potential changes at thin solid contact ion transfer voltammetric membrane electrodes. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114800] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Han T, Mousavi Z, Mattinen U, Bobacka J. Coulometric response characteristics of solid contact ion-selective electrodes for divalent cations. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04718-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThe chronoamperometric and coulometric response of solid contact ion-selective electrodes (SCISEs) for the detection of divalent cations was investigated in order to provide a more complete description of the mechanism of the recently introduced coulometric transduction method for SCISEs. The coulometric transduction method has earlier been employed only for SCISEs that were selective to monovalent ions. The SCISEs utilized poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrene sulfonate) (PSS−) as the solid contact (ion-to-electron transducer). PEDOT(PSS) was electrodeposited on glassy carbon and covered with plasticized PVC-based ion-selective membranes (ISMs) that were selective towards divalent cations (Ca2+, Pb2+). In contrast to earlier studies, the results obtained in this work show that the coulometric response for the Pb2+-SCISE was limited mainly by ion transport in the PEDOT(PSS) layer, which was not the case for the Ca2+-SCISE, nor was it observed earlier for the monovalent ions. The exceptional behavior of the Pb2+-SCISE was explored further by electrochemical impedance spectroscopy, and it was shown that the effective redox capacitance of PEDOT(PSS) was significantly higher for the Pb2+-SCISE than for the Ca2+-SCISE although the polymerization charge of PEDOT(PSS) was the same. The slow transport of Pb2+ in PEDOT(PSS) was tentatively related to complexation between Pb2+ and PEDOT(PSS).
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20
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Stelmach E, Kaczmarczyk B, Maksymiuk K, Michalska A. Tailoring polythiophene cation-selective optodes for wide pH range sensing. Talanta 2020; 211:120663. [DOI: 10.1016/j.talanta.2019.120663] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 12/16/2019] [Accepted: 12/20/2019] [Indexed: 01/17/2023]
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21
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Stelmach E, Kałuza D, Konefał A, Maksymiuk K, Michalska A. pH Switchable Electrochemical and Optical Properties of Polyoctylthiophene – Pyrene Composites. ELECTROANAL 2020. [DOI: 10.1002/elan.201900677] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Emilia Stelmach
- Faculty of ChemistryUniversity of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Dawid Kałuza
- Faculty of ChemistryUniversity of Warsaw Pasteura 1 02-093 Warsaw Poland
| | - Anna Konefał
- Faculty of ChemistryUniversity of Warsaw Pasteura 1 02-093 Warsaw Poland
| | | | - Agata Michalska
- Faculty of ChemistryUniversity of Warsaw Pasteura 1 02-093 Warsaw Poland
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22
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Chen R, Yang A, Chang A, Oweimrin PF, Romero J, Vichitcharoenpaisarn P, Tapia S, Ha K, Villaflor C, Shen M. A Newly Synthesized Tris(crown ether) Ionophore for Assisted Ion Transfer at NanoITIES Electrodes. ChemElectroChem 2020. [DOI: 10.1002/celc.201901997] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ran Chen
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Anna Yang
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Albert Chang
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Philip F. Oweimrin
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Julian Romero
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | | | - Stephanie Tapia
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Kevin Ha
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Christopher Villaflor
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
| | - Mei Shen
- Department of Chemistry University of Illinois at Urbana-Champaign 600 South Mathews Avenue Urbana Illinois 61801
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23
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Forrest T, Zdrachek E, Bakker E. Thin Layer Membrane Systems as Rapid Development Tool for Potentiometric Solid Contact Ion‐selective Electrodes. ELECTROANAL 2020. [DOI: 10.1002/elan.201900674] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tara Forrest
- Department of Inorganic and Analytical ChemistryUniversity of Geneva Quai Ernest-Ansermet 30 CH-1211 Geneva Switzerland
| | - Elena Zdrachek
- Department of Inorganic and Analytical ChemistryUniversity of Geneva Quai Ernest-Ansermet 30 CH-1211 Geneva Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical ChemistryUniversity of Geneva Quai Ernest-Ansermet 30 CH-1211 Geneva Switzerland
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24
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Colorimetric and fluorometric aggregation-based heparin assay by using gold nanoclusters and gold nanoparticles. Mikrochim Acta 2019; 186:790. [DOI: 10.1007/s00604-019-3928-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 10/12/2019] [Indexed: 02/06/2023]
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25
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Ali MA, Wang X, Chen Y, Jiao Y, Mahal NK, Moru S, Castellano MJ, Schnable JC, Schnable PS, Dong L. Continuous Monitoring of Soil Nitrate Using a Miniature Sensor with Poly(3-octyl-thiophene) and Molybdenum Disulfide Nanocomposite. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29195-29206. [PMID: 31318522 DOI: 10.1021/acsami.9b07120] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
There is an unmet need for improved fertilizer management in agriculture. Continuous monitoring of soil nitrate would address this need. This paper reports an all-solid-state miniature potentiometric soil sensor that works in direct contact with soils to monitor nitrate-nitrogen (NO3--N) in soil solution with parts-per-million (ppm) resolution. A working electrode is formed from a novel nanocomposite of poly(3-octyl-thiophene) and molybdenum disulfide (POT-MoS2) coated on a patterned Au electrode and covered with a nitrate-selective membrane using a robotic dispenser. The POT-MoS2 layer acts as an ion-to-electron transducing layer with high hydrophobicity and redox properties. The modification of the POT chain with MoS2 increases both conductivity and anion exchange, while minimizing the formation of a thin water layer at the interface between the Au electrode and the ion-selective membrane, which is notorious for solid-state potentiometric ion sensors. Therefore, the use of POT-MoS2 results in an improved sensitivity and selectivity of the working electrode. The reference electrode comprises a screen-printed silver/silver chloride (Ag/AgCl) electrode covered by a protonated Nafion layer to prevent chloride (Cl-) leaching in long-term measurements. This sensor was calibrated using both standard and extracted soil solutions, exhibiting a dynamic range that includes all concentrations relevant for agricultural applications (1-1500 ppm NO3--N). With the POT-MoS2 nanocomposite, the sensor offers a sensitivity of 64 mV/decade for nitrate detection, compared to 48 mV/decade for POT and 38 mV/decade for MoS2. The sensor was embedded into soil slurries where it accurately monitored nitrate for a duration of 27 days.
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Affiliation(s)
| | | | | | | | | | | | | | - James C Schnable
- Department of Agronomy and Horticulture , University of Nebraska-Lincoln , Lincoln 68588 , Nebraska , United States
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26
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Flavin MT, Freeman DK, Han J. Interfacial ion transfer and current limiting in neutral-carrier ion-selective membranes: A detailed numerical model. J Memb Sci 2019. [DOI: 10.1016/j.memsci.2018.10.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Izadyar A, Hershberger JC, Rogers R. Voltammetric Assessment of Ions Transfer at Ionophore-Graphene Based Polymeric Membranes. ELECTROANAL 2018. [DOI: 10.1002/elan.201800535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anahita Izadyar
- Department of Chemistry and Physics; Arkansas State University; PO Box 419 State University, AR 72467 USA
| | - John C. Hershberger
- Department of Chemistry and Physics; Arkansas State University; PO Box 419 State University, AR 72467 USA
| | - Robert Rogers
- Department of Chemistry and Physics; Arkansas State University; PO Box 419 State University, AR 72467 USA
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28
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Effect of oxidation ratio of conducting polymer on potential stability of the conducting polymer-coated electrode in voltammetric cell for the ion transfer. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.07.057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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29
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Izadyar A. Stripping Voltammetry at the Interface between two Immiscible Electrolyte Solutions: A Review Paper. ELECTROANAL 2018. [DOI: 10.1002/elan.201800279] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anahita Izadyar
- Department of Chemistry and Physics; Arkansas State University, PO Box 419; State University; AR 72467 USA
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30
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Zdrachek E, Bakker E. Electrochemically Switchable Polymeric Membrane Ion-Selective Electrodes. Anal Chem 2018; 90:7591-7599. [DOI: 10.1021/acs.analchem.8b01282] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Elena Zdrachek
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
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31
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Jarolímová Z, Bosson J, Labrador GM, Lacour J, Bakker E. Ion Transfer Voltammetry in Polyurethane Thin Films Based on Functionalised Cationic [6]Helicenes for Carbonate Detection. ELECTROANAL 2018. [DOI: 10.1002/elan.201800080] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Zdeňka Jarolímová
- Department of Inorganic and Analytical Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Johann Bosson
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Geraldine M. Labrador
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
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32
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Jaworska E, Mazur M, Maksymiuk K, Michalska A. Fate of Poly(3-octylthiophene) Transducer in Solid Contact Ion-Selective Electrodes. Anal Chem 2018; 90:2625-2630. [PMID: 29334225 DOI: 10.1021/acs.analchem.7b04233] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An experimental approach allowing visualization and quantification of the underestimated spontaneous process of partition of conducting polymer transducer material to the ion-selective membrane phase is proposed. The approach proposed is based on optical properties of the transducer material applied, using polythiophene as a model system. It is shown that this process occurs not only during the sensor preparation step but also during pretreatment of the sensor before use. As shown, this uncontrolled partition of the transducer to the receptor leads to conducting polymer contents in the membrane phase reaching 0.5% w/w; this process is accompanied by a partial spontaneous change of the oxidation state of polythiophene. The conducting polymer present in the membrane participates to some extent in the overall response of the sensor, which can be observed as a change in the polythiophene optical emission spectra. Fluorescence microscopic images obtained clearly show that the conducting polymer is distributed throughout the membrane thickness, being present also at the membrane/solution interface. The experimental results presented were obtained for K+-selective sensors using poly(3-octylthiophene) as a model transducer; however, the proposed approach is also applicable for other systems.
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Affiliation(s)
- Ewa Jaworska
- Faculty of Chemistry, University of Warsaw , Pasteura 1, 02-093 Warsaw, Poland
| | - Maciej Mazur
- Faculty of Chemistry, University of Warsaw , Pasteura 1, 02-093 Warsaw, Poland
| | - Krzysztof Maksymiuk
- Faculty of Chemistry, University of Warsaw , Pasteura 1, 02-093 Warsaw, Poland
| | - Agata Michalska
- Faculty of Chemistry, University of Warsaw , Pasteura 1, 02-093 Warsaw, Poland
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33
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Jarolímová Z, Bosson J, Labrador GM, Lacour J, Bakker E. Ion Transfer Voltammetry at Thin Films Based on Functionalized Cationic [6]Helicenes. ELECTROANAL 2017. [DOI: 10.1002/elan.201700669] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Zdeňka Jarolímová
- Department of Inorganic and Analytical Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Johann Bosson
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Geraldine M. Labrador
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Jérôme Lacour
- Department of Organic Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry; University of Geneva; Quai Ernest Ansermet 30 1211 Geneva 4 Switzerland
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34
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Chen R, Balla RJ, Lima A, Amemiya S. Characterization of Nanopipet-Supported ITIES Tips for Scanning Electrochemical Microscopy of Single Solid-State Nanopores. Anal Chem 2017; 89:9946-9952. [PMID: 28819966 PMCID: PMC5683184 DOI: 10.1021/acs.analchem.7b02269] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nanoscale scanning electrochemical microscopy (SECM) is a powerful scanning probe technique that enables high-resolution imaging of chemical processes at single nanometer-sized objects. However, it has been a challenging task to quantitatively understand nanoscale SECM images, which requires accurate characterization of the size and geometry of nanoelectrode tips. Herein, we address this challenge through transmission electron microscopy (TEM) of quartz nanopipets for SECM imaging of single solid-state nanopores by using nanopipet-supported interfaces between two immiscible electrolyte solutions (ITIES) as tips. We take advantage of the high resolution of TEM to demonstrate that laser-pulled quartz nanopipets reproducibly yield not only an extremely small tip diameter of ∼30 nm, but also a substantial tip roughness of ∼5 nm. The size and roughness of a nanopipet can be reliably determined by optimizing the intensity of the electron beam not to melt or deform the quartz nanotip without a metal coating. Electrochemically, the nanoscale ITIES supported by a rough nanotip gives higher amperometric responses to tetrabutylammonium than expected for a 30 nm diameter disc tip. The finite element simulation of sphere-cap ITIES tips accounts for the high current responses and also reveals that the SECM images of 100 nm diameter Si3N4 nanopores are enlarged along the direction of the tip scan. Nevertheless, spatial resolution is not significantly compromised by a sphere-cap tip, which can be scanned in closer proximity to the substrate. This finding augments the utility of a protruded tip, which can be fabricated and miniaturized more readily to facilitate nanoscale SECM imaging.
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Affiliation(s)
- Ran Chen
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania, 15260, United States
| | - Ryan J. Balla
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania, 15260, United States
| | - Alex Lima
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania, 15260, United States
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo, SP, Brazil
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania, 15260, United States
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35
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Yang S, Gao T, Dong J, Xu H, Gao F, Chen Q, Gu Y, Zeng W. A novel water-soluble AIE-based fluorescence probe with red emission for the sensitive detection of heparin in aqueous solution and human serum samples. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.08.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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36
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Almeida MIGS, Cattrall RW, Kolev SD. Polymer inclusion membranes (PIMs) in chemical analysis - A review. Anal Chim Acta 2017; 987:1-14. [PMID: 28916032 DOI: 10.1016/j.aca.2017.07.032] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 07/09/2017] [Accepted: 07/12/2017] [Indexed: 11/27/2022]
Abstract
This review highlights the increasing interest in polymer inclusion membranes (PIMs) in analytical chemistry as they are adapted to new and novel applications. PIMs are polymer-based liquid membranes and were first introduced 50 years ago as the sensing membranes in ion-selective electrodes and optodes. More recently however, PIMs have been used for other applications in analytical chemistry such as for sample separation, sample pre-concentration, electro-driven extraction, and passive sampling, and have also been incorporated into on-line and automated analysis systems. The present review provides a general overview of the analytical chemistry applications of PIMs reported in the literature to date and illustrates their versatility for solving challenging chemical analysis problems.
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Affiliation(s)
- M Inês G S Almeida
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Robert W Cattrall
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Spas D Kolev
- School of Chemistry, The University of Melbourne, Victoria 3010, Australia.
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37
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Zheng J, Ye T, Chen J, Xu L, Ji X, Yang C, He Z. Highly sensitive fluorescence detection of heparin based on aggregation-induced emission of a tetraphenylethene derivative. Biosens Bioelectron 2017; 90:245-250. [DOI: 10.1016/j.bios.2016.11.056] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 11/22/2016] [Accepted: 11/23/2016] [Indexed: 01/03/2023]
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38
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Yuan D, Cuartero M, Crespo GA, Bakker E. Voltammetric Thin-Layer Ionophore-Based Films: Part 2. Semi-Empirical Treatment. Anal Chem 2017; 89:595-602. [PMID: 27976860 DOI: 10.1021/acs.analchem.6b03355] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This work reports on a semiempirical treatment that allows one to rationalize and predict experimental conditions for thin-layer ionophore-based films with cation-exchange capacity read out with cyclic voltammetry. The transition between diffusional mass transport and thin-layer regime is described with a parameter (α), which depends on membrane composition, diffusion coefficient, scan rate, and electrode rotating speed. Once the thin-layer regime is fulfilled (α = 1), the membrane behaves in some analogy to a potentiometric sensor with a second discrimination variable (the applied potential) that allows one to operate such electrodes in a multianalyte detection mode owing to the variable applied ion-transfer potentials. The limit of detection of this regime is defined with a second parameter (β = 2) and is chosen in analogy to the definition of the detection limit for potentiometric sensors provided by the IUPAC. The analytical equations were validated through the simulation of the respective cyclic voltammograms under the same experimental conditions. While simulations of high complexity and better accuracy satisfactorily reproduced the experimental voltammograms during the forward and backward potential sweeps (companion paper 1), the semiempirical treatment here, while less accurate, is of low complexity and allows one to quite easily predict relevant experimental conditions for this emergent methodology.
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Affiliation(s)
- Dajing Yuan
- Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Maria Cuartero
- Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Gaston A Crespo
- Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and Analytical Chemistry, University of Geneva , Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
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39
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Sheppard JB, Hambly B, Pendley B, Lindner E. Voltammetric determination of diffusion coefficients in polymer membranes. Analyst 2017; 142:930-937. [DOI: 10.1039/c6an02671k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The diffusion-controlled transport of ions and molecules through polymer membranes utilized in chemical and biosensors is often the key factor determining the response characteristics of these sensors. A simple voltammetric method utilizing a planar electrochemical cell allows the rapid determination of diffusion coefficients in resistive polymer membranes.
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Affiliation(s)
| | - Bradley Hambly
- Department of Biomedical Engineering
- University of Memphis
- Memphis
- USA
| | - Bradford Pendley
- Department of Biomedical Engineering
- University of Memphis
- Memphis
- USA
| | - Erno Lindner
- Department of Biomedical Engineering
- University of Memphis
- Memphis
- USA
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40
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Li S, Huang P, Wu F. Highly selective and sensitive detection of heparin based on competition-modulated assembly and disassembly of fluorescent gold nanoclusters. NEW J CHEM 2017. [DOI: 10.1039/c6nj03155b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and economical fluorescence assay for heparin using glutathione-protected gold nanoclusters via competitive binding was developed.
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Affiliation(s)
- Sha Li
- College of Chemistry
- Nanchang University
- Nanchang 330031
- China
| | | | - Fangying Wu
- College of Chemistry
- Nanchang University
- Nanchang 330031
- China
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41
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Yuan D, Cuartero M, Crespo GA, Bakker E. Voltammetric Thin-Layer Ionophore-Based Films: Part 1. Experimental Evidence and Numerical Simulations. Anal Chem 2016; 89:586-594. [DOI: 10.1021/acs.analchem.6b03354] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Dajing Yuan
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Maria Cuartero
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Gaston A. Crespo
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
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42
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Izadyar A, Al-Amoody F, Arachchige DR. Ion transfer stripping voltammetry to detect nanomolar concentrations of Cr (VI) in drinking water. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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43
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Han T, Vanamo U, Bobacka J. Influence of Electrode Geometry on the Response of Solid-Contact Ion-Selective Electrodes when Utilizing a New Coulometric Signal Readout Method. ChemElectroChem 2016. [DOI: 10.1002/celc.201600575] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tingting Han
- Laboratory of Analytical Chemistry; Johan Gadolin Process Chemistry Centre; Åbo Akademi University; Biskopsgatan 8 FI-20500 Åbo Finland
| | - Ulriika Vanamo
- Laboratory of Analytical Chemistry; Johan Gadolin Process Chemistry Centre; Åbo Akademi University; Biskopsgatan 8 FI-20500 Åbo Finland
| | - Johan Bobacka
- Laboratory of Analytical Chemistry; Johan Gadolin Process Chemistry Centre; Åbo Akademi University; Biskopsgatan 8 FI-20500 Åbo Finland
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44
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Amemiya S. Voltammetric Ion Selectivity of Thin Ionophore-Based Polymeric Membranes: Kinetic Effect of Ion Hydrophilicity. Anal Chem 2016; 88:8893-901. [PMID: 27527590 PMCID: PMC5031248 DOI: 10.1021/acs.analchem.6b02551] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The high ion selectivity of potentiometric and optical sensors based on ionophore-based polymeric membranes is thermodynamically limited. Here, we report that the voltammetric selectivity of thin ionophore-based polymeric membranes can be kinetically improved by several orders of magnitude in comparison with their thermodynamic selectivity. The kinetic improvement of voltammetric selectivity is evaluated quantitatively by newly introducing a voltammetric selectivity coefficient in addition to a thermodynamic selectivity coefficient. Experimentally, both voltammetric and thermodynamic selectivity coefficients are determined from cyclic voltammograms of excess amounts of analyte and interfering ions with respect to the amount of a Na(+)- or Li(+)-selective ionophore in thin polymeric membranes. We reveal the slower ionophore-facilitated transfer of a smaller alkaline earth metal cation with higher hydrophilicity across the membrane/water interface, thereby kinetically improving voltammetric Na(+) selectivity against calcium, strontium, and barium ions by 3, 2, and 1 order of magnitude, respectively, in separate solutions. Remarkably, voltammetric Na(+) and Li(+) selectivity against calcium and magnesium ions in mixed solutions is improved by 4 and >7 orders of magnitude, respectively, owing to both thermodynamic and kinetic effects in comparison with thermodynamic selectivity in separate solutions. Advantageously, the simultaneous detection of sodium and calcium ions is enabled voltammetrically in contrast to the potentiometric and optical counterparts. Mechanistically, we propose a new hypothetical model that the slower transfer of a more hydrophilic ion is controlled by its partial dehydration during the formation of the adduct with a "water finger" prior to complexation with an ionophore at the membrane/water interface.
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Affiliation(s)
- Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania, 15260
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45
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Greenawalt PJ, Amemiya S. Voltammetric Mechanism of Multiion Detection with Thin Ionophore-Based Polymeric Membrane. Anal Chem 2016; 88:5827-34. [PMID: 27111277 PMCID: PMC5029862 DOI: 10.1021/acs.analchem.6b00397] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The capability to detect multianalyte ions in their mixed solution is an important advantage of voltammetry with an ionophore-based polymeric membrane against the potentiometric and optical counterparts. This advanced capability is highly attractive for the analysis of physiological ions at millimolar concentrations in biological and biomedical samples. Herein, we report on the comprehensive response mechanisms based on the voltammetric exchange and transfer of millimolar multiions at a thin polymeric membrane, where an ionophore is exhaustively depleted upon the transfer of the most favorable primary ion, I(zI). With a new voltammetric ion-exchange mechanism, the primary ion is exchanged with the secondary favorable ion, J(zJ), at more extreme potentials to transfer a net charge of |zJ|/nJ - |zI|/nI for each ionophore molecule, which forms 1:nI and 1:nJ complexes with the respective ions. Alternatively, an ion-transfer mechanism utilizes the second ionophore that independently transfers the secondary ion without ion exchange. Experimentally, a membrane is doped with a Na(+)- or Li(+)-selective ionophore to detect not only the primary ion, but also the secondary alkaline earth ion, based on the ion-exchange mechanism, where both ions form 1:1 complexes with the ionophores to transfer a net charge of +1. Interestingly, the resultant peak potentials of the secondary divalent ion vary with its sample activity to yield an apparently super-Nernstian slope as predicted theoretically. By contrast, the voltammetric exchange of calcium ion (nI = 3) with lithium ion (nJ = 1) by a Ca(2+)-selective ionophore is thermodynamically unfavorable, thereby requiring a Li(+)-selective ionophore for the ion-transfer mechanism.
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Affiliation(s)
- Peter J. Greenawalt
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260
| | - Shigeru Amemiya
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA 15260
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46
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Hu J, Stein A, Bühlmann P. Rational design of all-solid-state ion-selective electrodes and reference electrodes. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2015.11.004] [Citation(s) in RCA: 220] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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47
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Cuartero M, Crespo GA, Bakker E. Ionophore-Based Voltammetric Ion Activity Sensing with Thin Layer Membranes. Anal Chem 2016; 88:1654-60. [DOI: 10.1021/acs.analchem.5b03611] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Maria Cuartero
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Gaston A. Crespo
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
| | - Eric Bakker
- Department of Inorganic and
Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland
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48
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Colombo ML, McNeil S, Iwai N, Chang A, Shen M. Electrochemical Detection of Dopamine via Assisted Ion Transfer at Nanopipet Electrode Using Cyclic Voltammetry. JOURNAL OF THE ELECTROCHEMICAL SOCIETY 2015; 163:H3072-H3076. [PMID: 29606735 PMCID: PMC5873601 DOI: 10.1149/2.0091604jes] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We present here the detection of dopamine (DA) at nanopipet electrodes with radii of hundreds of nanometers ranging from 160 nm to 480 nm. Dibenzo-18-crown-6 (DB18C6) was employed as an ionophore to facilitate DA transfer, resulting in a half-wave transfer potential, E1/2, DA, of -0.322 (±0.020) V vs. E1/2, TBA. Well-defined steady-state sigmoidal cyclic voltammograms were observed for the transfer of DA. High resolution scanning electron microscopy was used to measure the size and taper angle of the nanopipet electrodes. The detection is linear with concentration of DA ranging from 0.25 mM to 2 mM; calculated diffusion coefficient at nanopipet electrodes with above mentioned sizes is 4.87 (±0.28) × 10-10 m2/s. The effect of the common interferent ascorbic acid on DA detection with nanopipet electrodes was evaluated, where DA detection still shows linear behavior with well-defined sigmoidal CVs with E1/2, DA being -0.328 (±0.029) V vs. E1/2, TBA. The diffusion coefficient for DA transfer in MgCl2 with the presence of 2 mM AA was measured to be 1.93 (±0.59) × 10-10 m2/s on nanoelectrodes with radii from 161 nm to 263 nm, but the physiological concentration of 0.1 mM AA had no effect on DA's diffusion coefficient.
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Affiliation(s)
- Michelle L. Colombo
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Swami McNeil
- University of Illinois College of Nursing, Champaign, Illinois 61821, USA
| | - Nicholas Iwai
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Albert Chang
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Mei Shen
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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49
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Ding Y, Shi L, Wei H. A "turn on" fluorescent probe for heparin and its oversulfated chondroitin sulfate contaminant. Chem Sci 2015; 6:6361-6366. [PMID: 30090254 PMCID: PMC6054120 DOI: 10.1039/c5sc01675d] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 07/23/2015] [Indexed: 11/21/2022] Open
Abstract
Designing "turn on" fluorescent probes for heparin (Hep), a widely used anticoagulant in clinics, is of great importance but remains challenging. By introducing a Hep specific binding peptide AG73 to a typical aggregation induced emission (AIE) fluorogen, tetraphenylethene (TPE), a sensitive and selective "turn on" fluorescent probe named TPE-1 for Hep was developed. TPE-1 was able to detect Hep in a wide pH range of 3-10 without obvious interference from tested anions and biomolecules, especially Hep analogues known as chondroitin sulfate (Chs) and hyaluronic acid (HA). The detection limit of Hep sensing was 3.8 ng mL-1, which was far below the clinically demanded concentration of Hep. The probe was applicable to both unfractionated Hep and low molecular weight Hep, the two main heparin products clinically used. Besides, the fluorescence of Hep bound TPE-1 can be turned off via sequential treatment with heparinases. Importantly, this phenomenon allows us to develop an enzyme assisted strategy for "turn on" sensing of oversulfated chondroitin sulfate (OSCS) with a detection limit of 0.001% (w%), which is the main contaminant in Hep and may cause severe adverse reactions including death.
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Affiliation(s)
- Yubin Ding
- Department of Biomedical Engineering , College of Engineering and Applied Sciences , Collaborative Innovation Center of Chemistry for Life Sciences , Nanjing National Laboratory of Microstructures , Nanjing University , Nanjing , Jiangsu 210093 , China . ; http://www.weilab.nju.edu.cn ; ; Tel: +86-25-83593272
| | - Leilei Shi
- Department of Biomedical Engineering , College of Engineering and Applied Sciences , Collaborative Innovation Center of Chemistry for Life Sciences , Nanjing National Laboratory of Microstructures , Nanjing University , Nanjing , Jiangsu 210093 , China . ; http://www.weilab.nju.edu.cn ; ; Tel: +86-25-83593272
| | - Hui Wei
- Department of Biomedical Engineering , College of Engineering and Applied Sciences , Collaborative Innovation Center of Chemistry for Life Sciences , Nanjing National Laboratory of Microstructures , Nanjing University , Nanjing , Jiangsu 210093 , China . ; http://www.weilab.nju.edu.cn ; ; Tel: +86-25-83593272
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50
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Greenawalt PJ, Garada MB, Amemiya S. Voltammetric Characterization of Ion–Ionophore Complexation Using Thin Polymeric Membranes: Asymmetric Thin-Layer Responses. Anal Chem 2015; 87:8564-72. [DOI: 10.1021/acs.analchem.5b02355] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Peter J. Greenawalt
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Mohammed B. Garada
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Shigeru Amemiya
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
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