51
|
Zhai J, Yang L, Du X, Xie X. Electrochemical-to-Optical Signal Transduction for Ion-Selective Electrodes with Light-Emitting Diodes. Anal Chem 2018; 90:12791-12795. [DOI: 10.1021/acs.analchem.8b03213] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Jingying Zhai
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Liyuan Yang
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xinfeng Du
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Xiaojiang Xie
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, China
| |
Collapse
|
52
|
Jansod S, Cuartero M, Cherubini T, Bakker E. Colorimetric Readout for Potentiometric Sensors with Closed Bipolar Electrodes. Anal Chem 2018; 90:6376-6379. [DOI: 10.1021/acs.analchem.8b01585] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Sutida Jansod
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Maria Cuartero
- Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, 1211 Geneva 4, Switzerland
| | - Thomas Cherubini
- Department of Inorganic and Analytical 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
| |
Collapse
|
53
|
Shibata H, Henares TG, Yamada K, Suzuki K, Citterio D. Implementation of a plasticized PVC-based cation-selective optode system into a paper-based analytical device for colorimetric sodium detection. Analyst 2018; 143:678-686. [PMID: 29299546 DOI: 10.1039/c7an01952a] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
On the example of a colorimetric sodium assay, this work demonstrates the implementation of a classical cation-exchange optode relying on an ionophore-doped plasticized PVC membrane into a paper-based analytical device (PAD). An ion-selective optode (ISO) system has been arranged into a vertically-assembled PAD (vPAD) integrating a pH-buffering function. Capillary force-driven sample liquid transportation through the paper matrix enabled pH-adjustment prior to the optical detection of the analyte cation. Functionalized paper layers with inkjet-deposited ISO membranes were combined with whole device lamination to attain a stable ion-exchange equilibrium required for the theoretical behavior of ISOs. Whole device lamination limited rapid evaporation of sample liquid on vPADs to avoid an increase of target concentration. Sigmoidal response curves between 10-5 and 1 M of Na+ at pH 5.0-7.0 have been confirmed on vPADs, following the theory defined by the cation-exchange equilibrium reaction. Finally, the influence of the cellulosic paper substrate matrix acting as a cation-exchanger on the optode response behavior has been evaluated and compared with conventional plastic film optodes.
Collapse
Affiliation(s)
- Hiroyuki Shibata
- Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Terence G Henares
- Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Kentaro Yamada
- Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Koji Suzuki
- Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| | - Daniel Citterio
- Department of Applied Chemistry, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
| |
Collapse
|
54
|
Wang X, Mahoney M, Meyerhoff ME. Inkjet-Printed Paper-Based Colorimetric Polyion Sensor Using a Smartphone as a Detector. Anal Chem 2017; 89:12334-12341. [DOI: 10.1021/acs.analchem.7b03352] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xuewei Wang
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Mollie Mahoney
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| | - Mark E. Meyerhoff
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, United States
| |
Collapse
|
55
|
Du X, Xie X. Non-Equilibrium Diffusion Controlled Ion-Selective Optical Sensor for Blood Potassium Determination. ACS Sens 2017; 2:1410-1414. [PMID: 28949507 DOI: 10.1021/acssensors.7b00614] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Blood electrolyte measurements play important roles in clinical diagnostics. Optical ion sensors as simple and elegant as a mercury thermometer are in high demand. We present here an analytical method to quantify potassium ions in undiluted human blood and plasma by measuring the distance or the rate of the color propagation. The sensor was composed of K+-selective nanospheres embedded in an agarose hydrogel where mass transport was diffusion controlled. The sensor's color-changing rate and the distance of color propagation depended linearly on the logarithm of K+ activity. A theoretical model was established and fully supported the experimental findings. This work lays the foundation of a new family of optical ion sensors for direct determination of common blood electrolytes.
Collapse
Affiliation(s)
- Xinfeng Du
- Department
of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| | - Xiaojiang Xie
- Department
of Chemistry, Southern University of Science and Technology, Shenzhen, 518055, P. R. China
| |
Collapse
|
56
|
Systematic approach in Mg 2+ ions analysis with a combination of tailored fluorophore design. Anal Chim Acta 2017; 988:96-103. [PMID: 28916109 DOI: 10.1016/j.aca.2017.07.062] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 07/13/2017] [Accepted: 07/29/2017] [Indexed: 11/24/2022]
Abstract
A systematic study of a series of diaza-18-crown-6 8-hydroxyquinoline (DCHQ) chemosensors, devoted to Mg(II) ion detection, was performed. Functionalization of DCHQ by peripheral substituents allowed the development of novel all-solid-state optodes via inclusion inside PVC-based polymeric films. The influence on the DCHQ-based optode response of the lipophilic sites functionalization and of the nature of the plasticizer, was investigated. Fluorimetric studies on optodes sensitivity towards a number of different metal cations (Ca2+, Na+, K+, Li+, Co2+, Cd2+, Pb2+, Cu2+, Hg2+, Zn2+) and NH4+ were carried out. The results demonstrated the suitability of the DCHQ optodes to perform fast monitoring (<10s) of magnesium (II) ions. Emission light signal was sufficiently brilliant to be captured by a low-cost computer webcam. The phenyl-substituted DCHQ-Ph derivative showed the best performance with a wide range for Mg(II) ion determination between 2.7 × 10-7 and 2.2 × 10-2 mol/L. It was possible, therefore, to determine the concentrations of Mg(II) in commercial fertilizer samples by DCHQ-Ph-based optodes with acceptable results: recoveries of 96.2-104.9% and relative standard deviation (RSD, n = 6) less than 5%. Moreover, in comparison to single sensors, the use of an array composed of five optodes (the ones showing the best performances in the preliminary tests) has allowed to reduce the RSD of magnesium determination in real samples (down to 3.7% with respect to 5.5% for single optodes) and to achieve a detection limit (estimated by s/n = 3 method) as low as 4.6 × 10-7 mol/L.
Collapse
|
57
|
A method for estimating intracellular ion concentration using optical nanosensors and ratiometric imaging. Sci Rep 2017; 7:10819. [PMID: 28883429 PMCID: PMC5589868 DOI: 10.1038/s41598-017-11162-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 08/18/2017] [Indexed: 11/22/2022] Open
Abstract
Optical nanoparticle (NP)-based sensors have been widely implemented as tools for detection of targeted ions and biomolecules. The NP sensing platform offer a modular design that can incorporate different sensing components for greater target specificity and the ability to tune the dynamic range, as well as encapsulation of multiple dyes to generate a ratiometric signal with varying spectra. Despite these advantages, demonstrating quantitative ion imaging for intracellular measurement still possess a major challenge. Here, we describe fundamentals that enable intracellular validation of this approach using ion-selective nanosensors for investigating calcium (Ca2+) as a model ion. While conventional indicators can improve individual aspects of indicator performance such as Kd, wavelength, and ratiometric measurements, the use of NP sensors can achieve combined benefits of addressing these issues simultaneously. The nanosensor incorporates highly calcium-selective ionophores and two fluorescence indicators that act as signal transducers to facilitate quantitative ratiometric imaging. For intracellular Ca2+ application, the sensors are fine-tuned to physiological sensing range, and live-cell imaging and quantification are demonstrated in HeLa cells loaded with nanosensors and their responsiveness to carbachol-evoked store release (~400 nM). The current nanosensor design thus provides a promising sensing platform for real-time detection and optical determination of intracellular ions.
Collapse
|
58
|
Lee CH, Folz J, Zhang W, Jo J, Tan JWY, Wang X, Kopelman R. Ion-Selective Nanosensor for Photoacoustic and Fluorescence Imaging of Potassium. Anal Chem 2017. [PMID: 28633520 DOI: 10.1021/acs.analchem.7b00930] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Ion-selective optodes (ISOs), the optical analog of ion-selective electrodes, have played an increasingly important role in chemical and biochemical analysis. Here we extend this technique to ion-selective photoacoustic optodes (ISPAOs) that serve at the same time as fluorescence-based ISOs, and apply it specifically to potassium (K+). Notably, the potassium ion is one of the most abundant cations in biological systems, involved in numerous physiological and pathological processes. Furthermore, it has been recently reported that the presence of abnormal extracellular potassium concentrations in tumors suppresses the immune responses and thus suppresses immunotherapy. However, unfortunately, sensors capable of providing potassium images in vivo are still a future proposition. Here, we prepared an ion-selective potassium nanosensor (NS) aimed at in vivo photoacoustic (PA) chemical imaging of the extracellular environment, while being also capable of fluorescence based intracellular ion-selective imaging. This potassium nanosensor (K+ NS) modulates its optical properties (absorbance and fluorescence) according to the potassium concentration. The K+ NS is capable of measuring potassium, in the range of 1 mM to 100 mM, with high sensitivity and selectivity, by ISPAO based measurements. Also, a near infrared dye surface modified K+ NS allows fluorescence-based potassium sensing in the range of 20 mM to 1 M. The K+ NS serves thus as both PA and fluorescence based nanosensor, with response across the biologically relevant K+ concentrations, from the extracellular 5 mM typical values (through PA imaging) to the intracellular 150 mM typical values (through fluorescence imaging).
Collapse
Affiliation(s)
- Chang H Lee
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Jeff Folz
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Wuliang Zhang
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Janggun Jo
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Joel W Y Tan
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Xueding Wang
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| | - Raoul Kopelman
- Department of Chemistry, ‡Biophysics Program, §Department of Biomedical Engineering, and ∥Department of Radiology, University of Michigan , Ann Arbor, Michigan 48109, United States
| |
Collapse
|
59
|
Müller BJ, Rappitsch T, Staudinger C, Rüschitz C, Borisov SM, Klimant I. Sodium-Selective Fluoroionophore-Based Optodes for Seawater Salinity Measurement. Anal Chem 2017; 89:7195-7202. [PMID: 28585806 DOI: 10.1021/acs.analchem.7b01373] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A new fluorescent sensor for Na+ is presented. The sensor relies on a Na+ selective fluoroionophore based on a bright red-emitting BODIPY chromophore. The fluorescence of the fluoroionophore is enhanced upon binding of Na+-ions to the highly selective aza-crown ether receptor due to reduction of the photoinduced electron transfer (PET) quenching. Solid state sensing materials were prepared by physically embedding the fluoroionophore into water-swellable biocompatible polymer matrices (polyurethane hydrogels), thus enabling continuous measurements of aqueous samples. Despite the simple design, the sensor showed no leaching of the indicator and featured fast and reversible response. Among different polyurethane hydrogels investigated, the hydrogel D1 featuring the highest water uptake was found to be the most suitable due to the highest dynamics between "off" and "on" states. Due to little or no cross sensitivity to other ions (e.g., Mg2+, Ca2+, K+) and its insensitivity to potential changes in pH, this sensor is promising for use in clinical diagnostics and for biological and marine applications. Fiber-optic sensors based on referenced read-out with a compact phase fluorimeter were prepared. To demonstrate their practical applicability, the sensors were used to determine the salinity in the seawater and brackish water of the Baltic Sea.
Collapse
Affiliation(s)
- Bernhard J Müller
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| | - Tanja Rappitsch
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| | - Christoph Staudinger
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| | - Christian Rüschitz
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| | - Sergey M Borisov
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| | - Ingo Klimant
- Graz University of Technology , Institute of Analytical Chemistry and Food Chemistry, Stremayrgasse 9, 8010 Graz, Austria
| |
Collapse
|
60
|
Abstract
In vivo biosensors are emerging as powerful tools in biomedical research and diagnostic medicine. Distinct from "labels" or "imaging", in vivo biosensors are designed for continuous and long-term monitoring of target analytes in real biological systems and should be selective, sensitive, reversible and biocompatible. Due to the challenges associated with meeting all of the analytical requirements, we found relatively few reports of research groups demonstrating devices that meet the strict definition in vivo. However, we identified several case studies and a range of emerging materials likely to lead to significant developments in the field.
Collapse
Affiliation(s)
- Guoxin Rong
- Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115
| | - Simon R. Corrie
- Department of Chemical Engineering, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash University, Clayton, VIC, 3800, Australia
- Australian Institute for Bioengineering and Nanotechnology, ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, University of Queensland, St Lucia, QLD, 4072, Australia
| | - Heather A. Clark
- Department of Pharmaceutical Sciences, Northeastern University, Boston, MA 02115
| |
Collapse
|
61
|
Soto RJ, Hall JR, Brown MD, Taylor JB, Schoenfisch MH. In Vivo Chemical Sensors: Role of Biocompatibility on Performance and Utility. Anal Chem 2017; 89:276-299. [PMID: 28105839 PMCID: PMC6773264 DOI: 10.1021/acs.analchem.6b04251] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Robert J. Soto
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599
| | - Jackson R. Hall
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599
| | - Micah D. Brown
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599
| | - James B. Taylor
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599
| | - Mark H. Schoenfisch
- Department of Chemistry, University of North Carolina at Chapel Hill, CB 3290, Chapel Hill, NC 27599
| |
Collapse
|
62
|
Di W, Czarny RS, Fletcher NA, Krebs MD, Clark HA. Comparative Study of Poly (ε-Caprolactone) and Poly(Lactic-co-Glycolic Acid) -Based Nanofiber Scaffolds for pH-Sensing. Pharm Res 2016; 33:2433-44. [PMID: 27380188 PMCID: PMC5007178 DOI: 10.1007/s11095-016-1987-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/27/2016] [Indexed: 01/12/2023]
Abstract
PURPOSE This study aims to develop biodegradable and biocompatible polymer-based nanofibers that continuously monitor pH within microenvironments of cultured cells in real-time. In the future, these fibers will provide a scaffold for tissue growth while simultaneously monitoring the extracellular environment. METHODS Sensors to monitor pH were created by directly electrospinning the sensor components within a polymeric matrix. Specifically, the entire fiber structure is composed of the optical equivalent of an electrode, a pH-sensitive fluorophore, an ionic additive, a plasticizer, and a polymer to impart mechanical stability. The resulting poly(ε-caprolactone) (PCL) and poly(lactic-co-glycolic acid) (PLGA) based sensors were characterized by morphology, dynamic range, reversibility and stability. Since PCL-based nanofibers delivered the most desirable analytical response, this matrix was used for cellular studies. RESULTS Electrospun nanofiber scaffolds (NFSs) were created directly out of optode material. The resulting NFS sensors respond to pH changes with a dynamic range centered at 7.8 ± 0.1 and 9.6 ± 0.2, for PCL and PLGA respectively. NFSs exhibited multiple cycles of reversibility with a lifetime of at least 15 days with preservation of response characteristics. By comparing the two NFSs, we found PCL-NFSs are more suitable for pH sensing due to their dynamic range and superior reversibility. CONCLUSION The proposed sensing platform successfully exhibits a response to pH and compatibility with cultured cells. NSFs will be a useful tool for creating 3D cellular scaffolds that can monitor the cellular environment with applications in fields such as drug discovery and tissue engineering.
Collapse
Affiliation(s)
- Wenjun Di
- Department of Pharmaceutical Sciences, Northeastern University, Boston, Massachusetts, 02115, USA
| | - Ryan S Czarny
- Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado, 80401, USA
| | - Nathan A Fletcher
- Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado, 80401, USA
| | - Melissa D Krebs
- Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado, 80401, USA
| | - Heather A Clark
- Department of Pharmaceutical Sciences, Northeastern University, Boston, Massachusetts, 02115, USA.
| |
Collapse
|
63
|
Erenas MM, de Orbe-Payá I, Capitan-Vallvey LF. Surface Modified Thread-Based Microfluidic Analytical Device for Selective Potassium Analysis. Anal Chem 2016; 88:5331-7. [DOI: 10.1021/acs.analchem.6b00633] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Miguel M. Erenas
- Department of Analytical Chemistry, Campus Fuentenueva, Faculty of
Sciences, 18071, University of Granada, Granada, Spain
| | - Ignacio de Orbe-Payá
- Department of Analytical Chemistry, Campus Fuentenueva, Faculty of
Sciences, 18071, University of Granada, Granada, Spain
| | - Luis Fermin Capitan-Vallvey
- Department of Analytical Chemistry, Campus Fuentenueva, Faculty of
Sciences, 18071, University of Granada, Granada, Spain
| |
Collapse
|
64
|
Mikhelson KN, Peshkova MA. Advances and trends in ionophore-based chemical sensors. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4506] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
65
|
Kisiel A, Kłucińska K, Gniadek M, Maksymiuk K, Michalska A. Optimizing calcium selective fluorimetric nanospheres. Talanta 2015; 144:398-403. [PMID: 26452839 DOI: 10.1016/j.talanta.2015.06.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 06/03/2015] [Accepted: 06/13/2015] [Indexed: 11/16/2022]
Abstract
Recently it was shown that optical nanosensors based on alternating polymers e.g. poly(maleic anhydride-alt-1-octadecene) were characterized by a linear dependence of emission intensity on logarithm of concentration over a few of orders of magnitude range. In this work we focus on the material used to prepare calcium selective nanosensors. It is shown that alternating polymer nanosensors offer competitive performance in the absence of calcium ionophore, due to interaction of the nanospheres building blocks with analyte ions. The emission increase corresponds to increase of calcium ions contents in the sample within the range from 10(-4) to 10(-1) M. Further improvement in sensitivity (from 10(-6) to 10(-1) M) and selectivity can be achieved by incorporating calcium ionophore in the nanospheres. The optimal results were obtained for core-shell nanospheres, where the core was prepared from poly(styrene-co-maleic anhydride) and the outer layer from poly(maleic anhydride-alt-1-octadecene). Thus obtained chemosensors were showing linear dependence of emission on logarithm of calcium ions concentration within the range from 10(-7) to 10(-1) M.
Collapse
Affiliation(s)
- Anna Kisiel
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland
| | - Katarzyna Kłucińska
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland
| | - Marianna Gniadek
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland
| | - Krzysztof Maksymiuk
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland
| | - Agata Michalska
- Department of Chemistry, Warsaw University, Pasteura 1, 02-093 Warsaw, Poland.
| |
Collapse
|
66
|
Ion selective optodes: from the bulk to the nanoscale. Anal Bioanal Chem 2015; 407:3899-910. [DOI: 10.1007/s00216-014-8413-4] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2014] [Revised: 12/08/2014] [Accepted: 12/13/2014] [Indexed: 01/06/2023]
|
67
|
Mistlberger G, Pawlak M, Bakker E, Klimant I. Photodynamic optical sensor for buffer capacity and pH based on hydrogel-incorporated spiropyran. Chem Commun (Camb) 2015; 51:4172-5. [DOI: 10.1039/c4cc07821g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The kinetics of a light activated proton extraction correlates with the buffer capacity of a sample at a given pH.
Collapse
Affiliation(s)
- G. Mistlberger
- Graz University of Technology
- Institue of Analytical Chemistry and Food Chemistry
- 8010 Graz
- Austria
| | - M. Pawlak
- University of Geneva
- Department of Inorganic and Analytical Chemistry
- 1211 Geneva 4
- Switzerland
| | - E. Bakker
- University of Geneva
- Department of Inorganic and Analytical Chemistry
- 1211 Geneva 4
- Switzerland
| | - I. Klimant
- Graz University of Technology
- Institue of Analytical Chemistry and Food Chemistry
- 8010 Graz
- Austria
| |
Collapse
|