Amperometric sensor study of the selectivity of poly(vinyl chloride) membranes plasticised with surfactants and liquid crystals

Reddy, Subrayal M.; Gangadharan, Bevin; Manini, Jodie

doi:10.1016/j.aca.2003.11.045

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…Various castable membranes have been used as the outer membrane for glucose sensors, typically CA (14,15), PC (16,17), PU (15,18,19), and PVC (20,21). These various membranes were evaluated as possible outer membranes for coil-type glucose sensors with excess enzyme loading.…”

Section: Evaluation Of Several Castable Polymers In Coil-type Glucosementioning

confidence: 99%

Coil-type implantable glucose biosensor with excess enzyme loading

Moussy²,

Moussy³

2005

Front Biosci

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As part of our overall long-term objective of designing a glucose sensor for long-term subcutaneous implantation, a coil-type implantable glucose sensor loaded with excess glucose oxidase (GOD) inside the coils of a 0.125mm diameter coiled platinum-iridium wire has been developed. The excess GOD was immobilized in a glutaraldehyde/bovine serum albumin (BSA) gel reinforced with cotton and located inside the coils chamber of the sensor. The excess GOD increased the lifetime of the sensor. Based on this coil-type design, various coil-type glucose sensors with cellulose acetate (CA), poly(vinyl chloride)(PVC), polyurethane (PU), poly(bisphenol A carbonate) (PC) and Nafion outer membranes were investigated and compared. Comparatively, Nafion based biosensors provided the best long-term response stability. However, Nafion can still not meet the lifetime requirement of the coil-type sensor with high enzyme loading because the observed function failure of these sensors was indeed caused by outer membrane damage rather than loss of enzyme activity. Additional experiments also revealed that hydrogen peroxide accumulation occurred in the GOD impregnated cotton when the sensors were not polarized which could cause a small false positive measurement. However, this artifact can be easily avoided by using an appropriate measurement technique.

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Section: Evaluation Of Several Castable Polymers In Coil-type Glucosementioning

confidence: 99%

Coil-type implantable glucose biosensor with excess enzyme loading

Moussy²,

Moussy³

2005

Front Biosci

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“…Thus, poly(vinyl chloride) membranes modified with cationic or non-ionic surfactants and combined with a liquid crystal, N-(4-methoxybenzylidene)−4-butylaniline) (NMBB), are used as a sensor for paracetamol, catechol, ascorbic acid and hydrogen peroxide. 24 The study showed that liquid crystal-modified membranes were permeably selective to paracetamol and hydrogen z E-mail: galal@sci.cu.edu.e.g peroxide. ILCs are also useful when applied for the determination of aromatic amino-acids namely tyrosine (Ty) and tryptophan (TP).…”

mentioning

confidence: 99%

Electrochemistry and Determination of an Antiviral Drug at Ionic Liquids Crystals-Carbon Nanotubes Modified Glassy Carbon Electrode

Galal¹,

Ahmed²,

Ahmed³

et al. 2021

J. Electrochem. Soc.

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Favipiravir (Fav) is an antiviral drug administered for the treatment of pulmonary infection and is also among the approved drugs for the treatment of lung inflammation in humans infected with COVID-19. Here we introduce the electrochemical behavior of Fav at ionic liquid crystals (ILCs)-carbon nanotubes (CNTs) modified electrode. The proposed electrode is ready for use in a one-step preparation protocol, is employed with low-cost instrumentation, and is distinctly sensitive and selective for the determination of the drug both in human serum and in commercially available medications. Ionic liquid crystals allow ionic interaction with the drug to realize its surface preconcentration. The limits of detection and quantification for the determination of Fav in blood-serum within the concentration range 0.9 to 150 μmol l–1 are 0.0161 and 0.119 μmol l–1, respectively. The sensor proved effective in the concurrent determination of several drugs used as prescribed “add-on” medication for the virus or for the treatment of other chronic diseases of some patients.

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“…Polyvinyl chloride (PVC) polymer has been described in the literature combined with LC in several contexts, in order to achieve new physical properties for a wide range of applications, such as modified membranes for electrochemical sensors [7], injection-modulated blends with liquid crystal polymers (LCP) for high-performance plastics [8] or as interfaces to induce surface molecular orientation [9].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Relaxation and Optical Transmittance of PVC Membranes Modified by Nematic Liquid Crystal

Carvalho

Figueiras

Mendonça

et al. 2009

GPOM

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This study intends to present some further research in polymer-dispersed liquid crystal (PDLC) systems [1]. These PDLC type cells were produced based on a lowcost commercial polymer (PVC) and liquid crystal E48 (Merck), using a modified solvent preparation method (SIPS). These cells were characterized electro-optically and by low frequency dielectric relaxation (20 Hz to 1 MHz) experiments.Results are encouraging; the prepared composites show regular microstructures and optical transmittance changes induced by the electric field, introducing an alternative way of producing low-cost PDLC electro-optical cells.

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Amperometric sensor study of the selectivity of poly(vinyl chloride) membranes plasticised with surfactants and liquid crystals

Cited by 10 publications

References 18 publications

Coil-type implantable glucose biosensor with excess enzyme loading

Coil-type implantable glucose biosensor with excess enzyme loading

Electrochemistry and Determination of an Antiviral Drug at Ionic Liquids Crystals-Carbon Nanotubes Modified Glassy Carbon Electrode

Dielectric Relaxation and Optical Transmittance of PVC Membranes Modified by Nematic Liquid Crystal

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