Performance of a portable biosensor for the analysis of ethion residues

Khaled, Elmorsy; Kamel, Manal S.; Hassan, H. N. A.; Abdel‐Gawad, Hassan; Aboul‐Enein, Hassan Y.

doi:10.1016/j.talanta.2013.11.001

Cited by 37 publications

(15 citation statements)

References 44 publications

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“…The bielectrode potentiometric strips were printed in arrays of six couples consisting of the working and reference electrodes each 5×35 mm . Ag/AgCl pseudo‐reference electrodes were firstly printed using homemade ink prepared by mixing 0.9 g Ag/AgCl mixture (65 : 35 %) with 0.8 g of 8 % PVC solution (in acetone−cyclohexanon mixture), and cured at 60 °C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…The change in ACh electrode potential within the reaction time was monitored to estimate the AChE activity by initial rate method (ΔE/Δt, determined by drawing tangent of the first linear part of potential‐time curve). For each concentration, 5 replicates were measured and the mean value of the inhibition degree was represented against the surfactant concentration .…”

Section: Methodsmentioning

confidence: 99%

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Novel Enzymatic Potentiometric Approaches for Surfactant Analysis

et al. 2016

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1IntroductionSurfactants form au nique class of organic compounds which generally consist of ah ydrophilic head group and ah ydrophobic chain (or tail) [1].T he hydrophobic part is usually hydrocarbon chain (C 8 -C 18 ), while the hydrophilic group may be carboxylates,s ulfates, sulfonates (anionic), polyoxyethylenated chains (nonionic) or quaternary ammoniums alts in case of cationic surfactants [1][2][3].Thew orldwide production of surfactants was about 13 million metric tonsi n2 008;7 0% of them represent anionico nes.S urfactants are mainly employed in formulation of detergents,p ersonal-care products, paints,p esticides and textile industry [4][5][6].A fter application, surfactants are discharged into waste treatment units and then dispersed into the environment causings erious toxic effects on aquatic organismsw hen discharged with massive quantities [7][8][9].Thew idespread applications of surfactants and their environmental impacts were reflected on the development of reliable,r apid and accurate procedures for surfactanta nalysis [10][11][12][13][14][15][16][17].T wo-phaset itrationi st he most populara nalytical method for ionic surfactants in water samples [18]. Thet arget surfactant is extracted into organic solvent via formation of lipophilic ion-pair with suitable titrant in presence of an ionic dye which colors the organic layer differently at the end point. Formation of emulsion during titration,t oxicity of the chlorinated organics olvent and lack of efficiency for short chain surfactanta re the main drawbacks of such method [14].P otentiometric approaches using ion selective electrodes (ISEs) are promising option for analysis of surfactants,offering simple measuring protocol and sample pre-treatment. Surfactant potentiometric sensors are usually used as titration end-point indicator electrodes;a lthough some direct potentiometric surfactant sensors have also been reported [13,17,19,20].Liquid and PVC membranes electrodes [21,22] are inconvenient as they are mechanically complicated with difficulty of miniaturization and short lifetime. Solid-state electrodes were reported referring to an ew type of ISEs in which the internal reference elementw as in direct contact with the electroactive membrane [13,20,[23][24][25]. Elimination of the internal reference solution leads to certain advantageous such as simplicity,m iniaturization and ability to operatea th igher pressuree nvironment where the PVC membrane can be damaged.C arbon paste electrodes (CPEs) were introduced as end-point indicator electrode for potentiometric titration of surfactants [19,20] with very short response time in addition to the ease of fabrication and regeneration. However,d esigns and shapes of the aforementioned sensors were inconvenient for every purpose such as flow injection analysis or portable analyzers where the measuring unitsr equired sensors of special constructions and size.Thep ractical and economic interests have been driven the development of various kindso fd isposal electrochemical sensors based on screen-print...

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Novel Enzymatic Potentiometric Approaches for Surfactant Analysis

et al. 2016

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“…Furthermore, CNTs can be easily modified and applied for the detection of drugs, biomarkers, cells and other analytes in complex matrixes, such as pharmaceutical formulations [77], biological fluids or tissues [78], soil [79], waters [80] and food [81,82]. Thus, numerous studies concerning electrochemical sensors based on CNTs have been reported.…”

Section: Carbon Nanotubes (Cnts)-based Spesmentioning

confidence: 99%

Recent developments, characteristics and potential applications of screen-printed electrodes in pharmaceutical and biological analysis

Couto

Lima

Quinaz

2016

Talanta

208

119

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“…The potentiometric bielectrode strips were printed on a ceramic support (dimensions 5 3 35 mm) using silver-and graphite-based pastes for reference and working electrodes, respectively [40]. The sensing cocktail composed of 2.0 mg calix [4]arene (XIII), 1.0 mg Hy, 360 mg f-PNPE and 240 mg PVC dissolved in 6 mL tetrahydrofuran was printed on the surface of the graphite/PVC conducting track and left to dry at 50 8C for 24 h. In alternative electrode matrix, 15 mg of SWCNTs were added to the aforementioned matrix, sonicated for 30 min and typically printed upon the conducting carbon track.…”

Section: Sensor Constructionmentioning

confidence: 99%

Novel Calixarene/Carbon Nanotubes Based Screen Printed Sensors for Flow Injection Potentiometric Determination of Naproxen

et al. 2018

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Novel sensitive disposable sensors have been introduced for potentiometric determination of naproxen (NAP) based on single‐walled carbon nanotubes‐polyvinyl chloride (SWNTs‐PVC) composite incorporated of calix[4]arene as host‐guest molecular recognition element. The electrode matrix composition was optimized on the basis of the nature and content of the sensing element, cationic sites, plasticizer and nanomaterial. Remarkable selectivity and sensitivity towards NAP was achieved in the concentration range from 10−8 to 10−2 mol L−1 with anionic Nernstian compliance −61.0±0.0 mV decade−1. Modification with calixarene and carbon nanotubes improved the sensors performance through formation of NAP‐calixarene inclusion complex and promotion of the electron‐transfer processes which enhance the potential stability, response time, and shelf lifetime of the sensor. The proposed sensors were successfully applied for the potentiometric assay of NAP in dosage formulation and biological fluids under batch and flow injection analysis (FIA) conditions with average recoveries agreeable with the reported official methods.

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Performance of a portable biosensor for the analysis of ethion residues

Cited by 37 publications

References 44 publications

Novel Enzymatic Potentiometric Approaches for Surfactant Analysis

Novel Enzymatic Potentiometric Approaches for Surfactant Analysis

Recent developments, characteristics and potential applications of screen-printed electrodes in pharmaceutical and biological analysis

Novel Calixarene/Carbon Nanotubes Based Screen Printed Sensors for Flow Injection Potentiometric Determination of Naproxen

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