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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.


Speed of response of PNR electrode prepared from aqueous solution. (A) Electrode conditioned in water (B) electrode conditioned in 0.001 M citrate.
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f5-sensors-08-00594: Speed of response of PNR electrode prepared from aqueous solution. (A) Electrode conditioned in water (B) electrode conditioned in 0.001 M citrate.

Mentions: The dynamic behavior of the electrodes was tested at three different concentrations. Figure 5 shows the response of electrodes conditioned in citrate solution and conditioned in water. The time to reach the final potential is up to 35 seconds. The response time is the same for both conditioning in citrate or in water, but the potential of PNR electrodes conditioned in citrate was more stable compared to the potential of those soaked in water. Conditioned electrodes responded to citrate anions practically immediately after immersion.


Optimalization of Poly(neutral red) Coated-wire Electrode for Determination of Citrate in Soft Drinks
Speed of response of PNR electrode prepared from aqueous solution. (A) Electrode conditioned in water (B) electrode conditioned in 0.001 M citrate.
© Copyright Policy
Related In: Results  -  Collection

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

f5-sensors-08-00594: Speed of response of PNR electrode prepared from aqueous solution. (A) Electrode conditioned in water (B) electrode conditioned in 0.001 M citrate.
Mentions: The dynamic behavior of the electrodes was tested at three different concentrations. Figure 5 shows the response of electrodes conditioned in citrate solution and conditioned in water. The time to reach the final potential is up to 35 seconds. The response time is the same for both conditioning in citrate or in water, but the potential of PNR electrodes conditioned in citrate was more stable compared to the potential of those soaked in water. Conditioned electrodes responded to citrate anions practically immediately after immersion.

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.