Potentiometric measurement of ascorbate by using a solvent polymeric membrane electrode

Guo, Huimin; Yin, Tanji; Su, Qingmei; Qin, Wei

doi:10.1016/j.talanta.2007.12.023

Cited by 18 publications

(17 citation statements)

References 32 publications

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“…Direct evidence of permanganate fluxes across ISE membrane has been tracked by graphite stove atomic absorption spectroscopy [18]. In the present work, the amounts of released permanganate ions are modulated by applying external currents.…”

Section: Current-controlled Release Of Permanganate Ions At Membrane mentioning

confidence: 80%

“…fluxes in the direction of the sample solution) has been developed for measuring a wide range of analytes which can decrease the concentrations of the indicator ions released at the samplemembrane phase boundary via complexing [17], redox [18] or enzyme-catalyzed reactions [19][20][21]. Such an ISE membrane not only serves as a polymer matrix for reagent release, but also works as a transducer for sensitive potentiometric detection, making the ISE membrane very attractive for sensor miniaturization.…”

Section: Introductionmentioning

confidence: 99%

“…It will be shown that such an ISE with current-controlled reagent delivery can offer a rapid and continuous way for measuring analytes in hydrodynamic conditions. As a proof-of-concept experiment, a ligand-free permanganate ISE based on an anion exchanger tridodecylmethylammonium chloride [18] is prepared for analysis of reductants. Reductants such as ascorbate, dopamine, and norepinephrine can be measured by oxidation with permanganate released continuously from the inner reference solution of the membrane ISE, which increases the ISE potential due to the consumption of permanganate at the samplemembrane interface.…”

Section: Introductionmentioning

confidence: 99%

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Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

Song

Ding

Liang

et al. 2011

Analytica Chimica Acta

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a b s t r a c tA polymeric membrane permanganate-selective electrode has been developed as a current-controlled reagent release system for potentiometric detection of reductants in flow injection analysis. By applying an external current, diffusion of permanganate ions across the polymeric membrane can be controlled precisely. The permanganate ions released at the sample-membrane interface from the inner filling solution of the electrode are consumed by reaction with a reductant in the sample solution thus changing the measured membrane potential, by which the reductant can be sensed potentiometrically. Ascorbate, dopamine and norepinephrine have been employed as the model reductants. Under the optimized conditions, the potential peak heights are proportional to the reductant concentrations in the ranges of 1.0 × 10 −5 to 2.5 × 10 −7 M for ascorbate, of 1.0 × 10 −5 to 5.0 × 10 −7 M for dopamine, and of 1.0 × 10 −5 to 5.0 × 10 −7 M for norepinephrine, respectively with the corresponding detection limits of 7.8 × 10 −8 , 1.0 × 10 −7 and 1.0 × 10 −7 M. The proposed system has been successfully applied to the determination of reductants in pharmaceutical preparations and vegetables, and the results agree well with those of iodimetric analysis.

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Section: Current-controlled Release Of Permanganate Ions At Membrane mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

Song

Ding

Liang

et al. 2011

Analytica Chimica Acta

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“…The conventional heparin selective membranes contained 1.5 wt% TDMAC, 66 wt% PVC and 32.5 wt% DOS (membrane 3). Membranes were prepared as described before [8]. For all the measurements, 50 mmol/L Tris-HCl buffer containing 0.12 mol/L NaCl was used as sample background and inner filling solution.…”

Section: Methodsmentioning

confidence: 99%

Potentiometric sensor for sensitive and selective detection of heparin

Chen

Liang

Qin

2012

Chinese Chemical Letters

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“…The same group also developed an anion electrode based on precipitate equilibrium at the sample-membrane phase boundary with released silver ions from the sensing membrane [19]. Our group has shown that the outward ion fluxes of ISE membrane can be used as a reagent controlled-release approach for redox sensing chemistries with submicromolar lower detection limits [20]. Such ISE membrane not only serves as a polymer matrix for reagent release, but also works as a transducer for sensitive potentiometric detection.…”

Section: Introductionmentioning

confidence: 99%

Polymeric Membrane Ion‐Selective Electrode for Butyrylcholinesterase Based on Controlled Release of Substrate

Ding

Qin

2009

Electroanalysis

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A butyrylcholine selective polymeric membrane electrode using o-b-cyclodextrin as ionophore is described as a reagent controlled-release system for reagentless detection of butyrylcholinesterase. Butyrylcholine released across the membrane from inner filling solution of the ion selective electrode is consumed by reaction of the enzyme in sample solution and the concentration of butyrylcholine at the membrane surface can be sensed potentiometrically. The electrode with 0.01 M butyrylcholine in the inner solution yields a potential that varies linearly with butyrylcholinesterase concentration over the range of 0.0075 -0.15 U mL À1 in 0.02 M of pH 7.4 sodium phosphate buffer solution. This approach can also be used to analyze butyrylcholinesterase inhibitors such as organophosphate pesticides. The inhibition percentage of parathion is proportional to its concentration in the range of 0.05 -0.5 ng mL À1 with a detection limit of 0.03 ng mL À1.

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Potentiometric measurement of ascorbate by using a solvent polymeric membrane electrode

Cited by 18 publications

References 32 publications

Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

Potentiometric flow injection system for determination of reductants using a polymeric membrane permanganate ion-selective electrode based on current-controlled reagent delivery

Potentiometric sensor for sensitive and selective detection of heparin

Polymeric Membrane Ion‐Selective Electrode for Butyrylcholinesterase Based on Controlled Release of Substrate

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