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Optimalization of Poly(neutral red) Coated-wire Electrode for Determination of Citrate in Soft Drinks

View Article: PubMed Central - PubMed

ABSTRACT

This report presents an optimization of potentiometric measurements with citrate-selective electropolymerized poly(neutral red) electrodes. The optimal background electrolyte for these measurements is a TRIS buffer with nitrate at pH 8.5. The electrodes described here exhibit stable and reproducible near-Nernstian response to citrates with a low detection limit of 6 × 10-6 M. Electrodes polymerized from sulfuric acid and acetonitrile are compared in detail. Simple and sensitive method for quantification of citrate in real-life samples by potentiometry with poly(neutral red) electrodes are presented. Data from potentiometric measurements of citrate are compared with capillary electrophoresis.

No MeSH data available.


Related in: MedlinePlus

Potential dependence of PNR(aq) and PNR(org) electrodes on concentration of buffer (HEPES, MES a TRIS) at pH 8.5 (A) and pH 5 (B).
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f3-sensors-08-00594: Potential dependence of PNR(aq) and PNR(org) electrodes on concentration of buffer (HEPES, MES a TRIS) at pH 8.5 (A) and pH 5 (B).

Mentions: PNR electrode signals are not affected by a change in the concentration of buffer (HEPES, MES and TRIS) at pH 5 and 8.5. The only exception is a high concentration (10-2 a 10-1 M) of the most lipophilic, HEPES (Fig. 3). The potentiometric response of the polymer film toward HEPES is a result of nonselective interactions between the PNR film and buffer at the polymer-sample phase boundary. Both MES and TRIS can be used for measurements with PNR electrodes.


Optimalization of Poly(neutral red) Coated-wire Electrode for Determination of Citrate in Soft Drinks
Potential dependence of PNR(aq) and PNR(org) electrodes on concentration of buffer (HEPES, MES a TRIS) at pH 8.5 (A) and pH 5 (B).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3672997&req=5

f3-sensors-08-00594: Potential dependence of PNR(aq) and PNR(org) electrodes on concentration of buffer (HEPES, MES a TRIS) at pH 8.5 (A) and pH 5 (B).
Mentions: PNR electrode signals are not affected by a change in the concentration of buffer (HEPES, MES and TRIS) at pH 5 and 8.5. The only exception is a high concentration (10-2 a 10-1 M) of the most lipophilic, HEPES (Fig. 3). The potentiometric response of the polymer film toward HEPES is a result of nonselective interactions between the PNR film and buffer at the polymer-sample phase boundary. Both MES and TRIS can be used for measurements with PNR electrodes.

View Article: PubMed Central - PubMed

ABSTRACT

This report presents an optimization of potentiometric measurements with citrate-selective electropolymerized poly(neutral red) electrodes. The optimal background electrolyte for these measurements is a TRIS buffer with nitrate at pH 8.5. The electrodes described here exhibit stable and reproducible near-Nernstian response to citrates with a low detection limit of 6 × 10-6 M. Electrodes polymerized from sulfuric acid and acetonitrile are compared in detail. Simple and sensitive method for quantification of citrate in real-life samples by potentiometry with poly(neutral red) electrodes are presented. Data from potentiometric measurements of citrate are compared with capillary electrophoresis.

No MeSH data available.


Related in: MedlinePlus