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Voltammetric Study of the Influence of Various Phosphate Anions on Silver Nanoparticle Oxidation.

Navolotskaya DV, Toh HS, Batchelor-McAuley C, Compton RG - ChemistryOpen (2015)

Bottom Line: The three different species of anions were found to have a varying degree of influence on silver oxidation with the order PO4 (3-)>HPO4 (2-)>H2PO4 (-).It was found that in the presence of phosphate anions, the silver oxidation potential shifts to a less positive value, which indicated the increasing ease of the oxidation reaction of silver.Given that the interplay between silver and its cation is crucial to its antibacterial properties and significant concentrations of the HPO4 (2-) anion are present at biological pH (near neutral), it is essential that the influence of the dibasic anion (HPO4 (2-)) on silver oxidation dynamics be considered for biological systems.

View Article: PubMed Central - PubMed

Affiliation: Saint Petersburg State University Universitetskaya nab.7-9, Saint Petersburg, 199034, Russia.

ABSTRACT
The antibacterial properties of silver are strongly controlled by the redox couple of silver/silver(I). This work reports the influence of phosphate anions on silver nanoparticle oxidation, which is important given the abundance of phosphate species in biological systems. The three different species of anions were found to have a varying degree of influence on silver oxidation with the order PO4 (3-)>HPO4 (2-)>H2PO4 (-). It was found that in the presence of phosphate anions, the silver oxidation potential shifts to a less positive value, which indicated the increasing ease of the oxidation reaction of silver. Given that the interplay between silver and its cation is crucial to its antibacterial properties and significant concentrations of the HPO4 (2-) anion are present at biological pH (near neutral), it is essential that the influence of the dibasic anion (HPO4 (2-)) on silver oxidation dynamics be considered for biological systems.

No MeSH data available.


Variation in the peak potential for the oxidation of silver nanoparticles as a function of negative common logarithm of equilibrium concentration of PO43− ion (A) and HPO42− ion (B) in Na3PO4 solutions. Values represent the mean ±S.E.M. of n=3 measurements.
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fig03: Variation in the peak potential for the oxidation of silver nanoparticles as a function of negative common logarithm of equilibrium concentration of PO43− ion (A) and HPO42− ion (B) in Na3PO4 solutions. Values represent the mean ±S.E.M. of n=3 measurements.

Mentions: In order to understand the nature of the complex formed, the dependences of the peak potential on the negative common logarithm of equilibrium concentrations of phosphate ion species were studied. As we can neglect the concentration of H2PO4− ion in Na3PO4 solutions, it was sensible to investigate the oxidation peak potential shift observed in Figure 2 as a function of −log[PO43−] and −log[HPO42−]. Figure 3 shows that the peak potential varies linearly with an increase of [PO43−] at a slope of 68±5 mV/decade with r2=0.973 and at a slope of 100±5 mV/decade (r2=0.987) with increasing [HPO42−].


Voltammetric Study of the Influence of Various Phosphate Anions on Silver Nanoparticle Oxidation.

Navolotskaya DV, Toh HS, Batchelor-McAuley C, Compton RG - ChemistryOpen (2015)

Variation in the peak potential for the oxidation of silver nanoparticles as a function of negative common logarithm of equilibrium concentration of PO43− ion (A) and HPO42− ion (B) in Na3PO4 solutions. Values represent the mean ±S.E.M. of n=3 measurements.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608526&req=5

fig03: Variation in the peak potential for the oxidation of silver nanoparticles as a function of negative common logarithm of equilibrium concentration of PO43− ion (A) and HPO42− ion (B) in Na3PO4 solutions. Values represent the mean ±S.E.M. of n=3 measurements.
Mentions: In order to understand the nature of the complex formed, the dependences of the peak potential on the negative common logarithm of equilibrium concentrations of phosphate ion species were studied. As we can neglect the concentration of H2PO4− ion in Na3PO4 solutions, it was sensible to investigate the oxidation peak potential shift observed in Figure 2 as a function of −log[PO43−] and −log[HPO42−]. Figure 3 shows that the peak potential varies linearly with an increase of [PO43−] at a slope of 68±5 mV/decade with r2=0.973 and at a slope of 100±5 mV/decade (r2=0.987) with increasing [HPO42−].

Bottom Line: The three different species of anions were found to have a varying degree of influence on silver oxidation with the order PO4 (3-)>HPO4 (2-)>H2PO4 (-).It was found that in the presence of phosphate anions, the silver oxidation potential shifts to a less positive value, which indicated the increasing ease of the oxidation reaction of silver.Given that the interplay between silver and its cation is crucial to its antibacterial properties and significant concentrations of the HPO4 (2-) anion are present at biological pH (near neutral), it is essential that the influence of the dibasic anion (HPO4 (2-)) on silver oxidation dynamics be considered for biological systems.

View Article: PubMed Central - PubMed

Affiliation: Saint Petersburg State University Universitetskaya nab.7-9, Saint Petersburg, 199034, Russia.

ABSTRACT
The antibacterial properties of silver are strongly controlled by the redox couple of silver/silver(I). This work reports the influence of phosphate anions on silver nanoparticle oxidation, which is important given the abundance of phosphate species in biological systems. The three different species of anions were found to have a varying degree of influence on silver oxidation with the order PO4 (3-)>HPO4 (2-)>H2PO4 (-). It was found that in the presence of phosphate anions, the silver oxidation potential shifts to a less positive value, which indicated the increasing ease of the oxidation reaction of silver. Given that the interplay between silver and its cation is crucial to its antibacterial properties and significant concentrations of the HPO4 (2-) anion are present at biological pH (near neutral), it is essential that the influence of the dibasic anion (HPO4 (2-)) on silver oxidation dynamics be considered for biological systems.

No MeSH data available.