Solid-Contact Ion-Selective Electrodes for Histamine Determination

Solid-contact ion-selective electrodes for histamine (HA) determination were fabricated and studied. Gold wire (0.5 mm diameter) was coated with poly(3,4-ethlenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) as a solid conductive layer. The polyvinyl chloride matrix embedded with 5,10,15,20-tetraphenyl(porphyrinato)iron(iii) chloride as an ionophore, 2-nitrophenyloctyl ether as a plasticizer and potassium tetrakis(p-chlorophenyl) borate as an ion exchanger was used to cover the PEDOT:PSS layer as a selective membrane. The characteristics of the HA electrodes were also investigated. The detection limit of 8.58 × 10−6 M, the fast response time of less than 5 s, the good reproducibility, the long-term stability and the selectivity in the presence of common interferences in biological fluids were satisfactory. The electrode also performed stably in the pH range of 7–8 and the temperature range of 35–41 °C. Additionally, the recovery rate of 99.7% in artificial cerebrospinal fluid showed the potential for the electrode to be used in biological applications.

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Application of polyaniline nanofibers for the construction of nitrate all-solid-state ion-selective electrodes

Applied Nanoscience ◽

10.1007/s13204-021-02228-1 ◽

2021 ◽

Author(s):

Karolina Pietrzak ◽

Cecylia Wardak ◽

Szymon Malinowski

Keyword(s):

Electrochemical Impedance ◽

Fast Response ◽

Point Of View ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Measuring Range ◽

Polyaniline Nanofibers ◽

Vis Spectroscopy ◽

Selective Membrane ◽

Nitrate Determination

AbstractThe application of polyaniline nanofibers doped with chloride and nitrate ions (PANINFs-Cl and PANINFs-NO3) in potentiometry was described. Both kinds of nanofibers were used as an ion-to-electron transducer in ion-selective electrodes with solid contact (SCISEs). Extensive research on the properties of the nanofibers themselves (SEM, UV–Vis spectroscopy, FTIR) and the constructed electrodes (potentiometric methods, electrochemical impedance spectroscopy) has been carried out. Basic analytical parameters of electrodes containing various nanofibers contents in the ion-selective membrane and with nanofibers as an intermediate layer were determined. It was found that application of PANI nanofibers resulted in improvement of electrode performance (among others, better stability and reversibility of the electrode potential). The obtained sensors were characterized by a high slope of the calibration curve, a wide measuring range and a fast response time. Moreover, they were insensitive to change of redox potential, as well as light and the presence of oxygen in the solution, what is important from a practical point of view. They were also successfully used for nitrate determination in real environmental samples.

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Ion-to-electron capacitance of single-walled carbon nanotube layers before and after ion-selective membrane deposition

Microchimica Acta ◽

10.1007/s00604-021-04805-1 ◽

2021 ◽

Vol 188 (5) ◽

Author(s):

Elena Zdrachek ◽

Eric Bakker

Keyword(s):

Carbon Nanotube ◽

Ion Selective Electrodes ◽

Solid Contact ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon ◽

Essential Step ◽

Before And After ◽

Selective Membrane ◽

High Potential Stability ◽

Potential Stability

AbstractThe capacitance of the ion-to-electron transducer layer helps to maintain a high potential stability of solid-contact ion-selective electrodes (SC-ISEs), and its estimation is therefore an essential step of SC-ISE characterization. The established chronopotentiometric protocol used to evaluate the capacitance of the single-walled carbon nanotube transducer layer was revised in order to obtain more reliable and better reproducible values and also to allow capacitance to be measured before membrane deposition for electrode manufacturing quality control purposes. The capacitance values measured with the revised method increased linearly with the number of deposited carbon nanotube–based transducer layers and were also found to correlate linearly before and after ion-selective membrane deposition, with correlation slopes close to 1 for nitrate-selective electrodes, to 0.7 and to 0.5 for potassium- and calcium-selective electrodes. Graphical abstract

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Selective Membrane Sensor for Aluminum Determination in Food Products, Real Samples and Standard Alloys

Membranes ◽

10.3390/membranes11070504 ◽

2021 ◽

Vol 11 (7) ◽

pp. 504

Author(s):

Sabry Khalil ◽

Ashraf Y. Elnaggar

Keyword(s):

Liquid Membrane ◽

Food Products ◽

Ion Selective Electrodes ◽

Real Samples ◽

Membrane Sensor ◽

Aluminum Ion ◽

Electrode Response ◽

Aluminum Ions ◽

Selective Membrane ◽

Ph Range

The study involves the fabrication of an aluminum liquid membrane sensor based on the association of aluminum ions with the cited reagent 2,9-dimethyl-4,11-diphenyl -1,5,8,12-tetraaza cyclote tradeca-1,4,8,11-tetraene [DDTCT]. The characteristics slope (58 mV), rapid and linear response for aluminum ion was displayed by the proposed sensor within the concentration range 2.5 × 10−7–1.5 × 10−1 M, the detection limit (1.6 × 10−7) M, the selectivity behavior toward some metal cations, the response time 10 s), lifetime (150 days), the effect of pH on the suggested electrode potential and the requisite analytical validations were examined. The suitable pH range was (5.0–8.0 ), in this range the proposed electrode response is independent of pH. The suggested electrode was applied to detect the aluminum ions concentration in food products, real samples and standard alloys. The resulting data by the suggested electrode were statistically analyzed, and compared with the previously reported aluminum ion-selective electrodes in the literature.

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High-performance humidity sensors from Ni(SO4)0.3(OH)1.4 nanobelts

Nanoscale ◽

10.1039/c4nr00277f ◽

2014 ◽

Vol 6 (12) ◽

pp. 6521-6525 ◽

Cited By ~ 7

Author(s):

Ming Zhuo ◽

Yuejiao Chen ◽

Tao Fu ◽

Haonan Zhang ◽

Zhi Xu ◽

...

Keyword(s):

High Performance ◽

Humidity Sensor ◽

High Sensitivity ◽

Fast Response ◽

Humidity Sensors ◽

Term Stability ◽

Long Term Stability

Ni(SO4)0.3(OH)1.4 nanobelts are utilized in a humidity sensor by a facile method. The nanobelt based sensor shows a high sensitivity, fast response and long-term stability in the sensing process.

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Solid-Contact Ion-Selective Electrodes: Response Mechanisms, Transducer Materials and Wearable Sensors

Membranes ◽

10.3390/membranes10060128 ◽

2020 ◽

Vol 10 (6) ◽

pp. 128 ◽

Cited By ~ 4

Author(s):

Yan Lyu ◽

Shiyu Gan ◽

Yu Bao ◽

Lijie Zhong ◽

Jianan Xu ◽

...

Keyword(s):

Biological Fluids ◽

Wearable Sensors ◽

Ion Selective Electrodes ◽

Double Layer Capacitance ◽

Solid Contact ◽

General Picture ◽

Non Invasive ◽

Potential Stability ◽

Electric Double Layer Capacitance ◽

Redox Capacitance

Wearable sensors based on solid-contact ion-selective electrodes (SC-ISEs) are currently attracting intensive attention in monitoring human health conditions through real-time and non-invasive analysis of ions in biological fluids. SC-ISEs have gone through a revolution with improvements in potential stability and reproducibility. The introduction of new transducing materials, the understanding of theoretical potentiometric responses, and wearable applications greatly facilitate SC-ISEs. We review recent advances in SC-ISEs including the response mechanism (redox capacitance and electric-double-layer capacitance mechanisms) and crucial solid transducer materials (conducting polymers, carbon and other nanomaterials) and applications in wearable sensors. At the end of the review we illustrate the existing challenges and prospects for future SC-ISEs. We expect this review to provide readers with a general picture of SC-ISEs and appeal to further establishing protocols for evaluating SC-ISEs and accelerating commercial wearable sensors for clinical diagnosis and family practice.

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Recent Progress in Disposable Ion-Selective Sensors for Environmental Applications

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.77.65 ◽

2012 ◽

Vol 77 ◽

pp. 65-70 ◽

Cited By ~ 4

Author(s):

Giusy Matzeu ◽

Claudio Zuliani ◽

Dermot Diamond

Keyword(s):

Film Thickness ◽

Recent Progress ◽

Low Cost ◽

Contact Layer ◽

Ion Selective Electrodes ◽

Complex Relationship ◽

Solid Contact ◽

Materials Used ◽

Deposition Techniques

Solid-contact Ion Selective Electrodes (SC-ISEs) for the detection of lead are prepared on screen printed substrates in order to have low-cost and disposable sensors which may be useful in long-term environmental monitoring. It is shown that the materials used as solid contact layer, the deposition techniques and their thickness affect greatly the performances of the sensors. Poly(3-octylthiophene-2,5-diyl) (POT) and poly-3,4-ethylenedioxithiophene (PEDOT) are employed in this investigation. A trend showing an optimum is found for sensors prepared with POT as the batch reproducibility depends on the amount drop-cast, i.e., thickness. In case of PEDOT which is grown amperometrically the trend is more complex but an optimum for the batch reproducibility is again found depending on the current density. In the latter case, the film thickness and the overoxidation degree of the polymer probably concur in determining a more complex relationship.

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Beryllium-Ion-Selective PEDOT Solid Contact Electrode Based on 9,10-Dinitrobenzo-9-Crown-3-Ether

Sensors ◽

10.3390/s20216375 ◽

2020 ◽

Vol 20 (21) ◽

pp. 6375

Author(s):

Junghwan Kim ◽

Dae Hee Kim ◽

Jin Cheol Yang ◽

Jae Sang Kim ◽

Ji Ha Lee ◽

...

Keyword(s):

Electrochemical Impedance ◽

Constant Current ◽

Solid Contact ◽

Response Characteristics ◽

Best Response ◽

Wide Ph Range ◽

Selective Membrane ◽

Nernstian Slope ◽

Ph Range ◽

Contact Electrode

A beryllium(II)-ion-selective poly(ethylenedioxythiophene) (PEDOT) solid contact electrode comprising 9,10-dinitrobenzo-9-crown-3-ether was successfully developed. The all-solid-state contact electrode, with an oxygen-containing cation-sensing membrane combined with an electropolymerized PEDOT layer, exhibited the best response characteristics. The performance of the constructed electrode was evaluated and optimized using potentiometry, conductance measurements, constant-current chronopotentiometry, and electrochemical impedance spectroscopy (EIS). Under optimized conditions, which were found for an ion-selective membrane (ISM) composition of 3% ionophore, 30% polyvinylchloride (PVC), 64% o-nitro phenyl octyl ether (o-NPOE), and 3% sodium tetraphenylborate (NaTPB), the fabricated electrode exhibited a good performance over a wide concentration range (10−2.5–10−7.0 M) and a wide pH range of 2.0–9.0, with a Nernstian slope of 29.5 mV/D for the beryllium (II) ion and a detection limit as low as 10−7.0 M. The developed electrode shows good selectivity for the beryllium(II) ion over alkali, alkaline earth, transition, and heavy metal ions.

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High performance electrochromic devices based on a polyindole derivative, poly(1H-benzo[g]indole)

Journal of Materials Chemistry C ◽

10.1039/c5tc02308d ◽

2015 ◽

Vol 3 (43) ◽

pp. 11318-11325 ◽

Cited By ~ 33

Author(s):

Guangming Nie ◽

Ling Wang ◽

Changlong Liu

Keyword(s):

Response Time ◽

High Performance ◽

Optical Memory ◽

Fast Response ◽

Electrochromic Devices ◽

Optical Contrast ◽

Fast Response Time ◽

Coloration Efficiency ◽

Long Term Stability

An ECD based on electrochromic poly(1H-benzo[g]indole) was fabricated. The color of this ECD can switch between green and navy blue with good optical contrast, high coloration efficiency, fast response time, better optical memory and long-term stability.

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Self-Healable Organic Electrochemical Transistor with High Transconductance, Fast Response, and Long-Term Stability

ACS Applied Materials & Interfaces ◽

10.1021/acsami.0c07913 ◽

2020 ◽

Vol 12 (30) ◽

pp. 33979-33988

Author(s):

Jieun Ko ◽

Xihu Wu ◽

Abhijith Surendran ◽

Bening Tirta Muhammad ◽

Wei Lin Leong

Keyword(s):

Fast Response ◽

Term Stability ◽

Long Term Stability ◽

Electrochemical Transistor ◽

High Transconductance

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Liquid Contact-Selective Potentiometric Sensor Based on Imprinted Polymeric Beads Towards 17β-Estradiol Determination

Polymers ◽

10.3390/polym12071506 ◽

2020 ◽

Vol 12 (7) ◽

pp. 1506

Author(s):

Ayman H. Kamel ◽

Abd El-Galil E. Amr ◽

Hoda R. Galal ◽

Elsayed A. Elsayed ◽

Ahmed I. Al-Sayady

Keyword(s):

Limit Of Detection ◽

Biological Fluids ◽

Pharmaceutical Preparations ◽

Sample Pretreatment ◽

Fast Response ◽

Ion Selective Electrodes ◽

Local Market ◽

Buffer Solution ◽

Wide Range ◽

17Β Estradiol

Novel potentiometric devices “ion-selective electrodes (ISEs)” were designed and characterized for the detection of 17β-estradiol (EST) hormone. The selective membranes were based on the use of man-tailored biomimics (i.e., molecularly imprinted polymers (MIPs)) as recognition ionophores. The synthesized MIPs include a functional monomer (methacrylic acid (MAA)) and a cross-linker (ethylene glycol dimethacrylic acid (EGDMA)) in their preparation. Changes in the membrane potential induced by the dissociated 17β-estradiol were investigated in 50 mM CO32−/HCO3− buffer solution at pH 10.5. The ion-selective electrodes (ISEs) exhibited fast response and good sensitivity towards 17β-estradiol with a limit of detection 1.5 µM over a linear range starts from 2.5 µM with an anionic response of 61.2 ± 1.2 mV/decade. The selectivity pattern of the proposed ISEs was also evaluated and revealed an enhanced selectivity towards EST over several phenolic compounds. Advantages revealed by the presented sensor (i.e., wide range of assay, enhanced accuracy and precision, low limit of detection, good selectivity, long-term potential stability, rapid response and long life-span and absence of any sample pretreatment steps) suggest its use in routine quality control/quality assurance tests. They were successfully applied to estradiol determination in biological fluids and in different pharmaceutical preparations collected from the local market.

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