Limits...
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.


The oxidation of silver nanoparticles on a glassy carbon electrode in 0.1 m NaNO3 (black) and 0.1 m NaH2PO4 (red) at a scan rate of 0.05 V s−1. Each data point consists of a minimum of three repeats.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4608526&req=5

fig05: The oxidation of silver nanoparticles on a glassy carbon electrode in 0.1 m NaNO3 (black) and 0.1 m NaH2PO4 (red) at a scan rate of 0.05 V s−1. Each data point consists of a minimum of three repeats.

Mentions: For the H2PO4− anion, its influence on silver oxidation dynamics is negligible. This can be observed from the voltammetric data obtained in 0.1 m solution of NaH2PO4 and presented in Figure 5. Despite a high concentration of dihydrogen phosphate ions (H2PO43−) and considerable content of hydrogen phosphates (HPO42−) (see Table S1 in the Supporting Information), the oxidation peak potential remained constant. This is likely due to the insignificant concentration of PO43− ions in solution. Thus, it can be concluded that PO43− ion has the strongest effect on silver oxidation dynamics among the three species.


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

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

The oxidation of silver nanoparticles on a glassy carbon electrode in 0.1 m NaNO3 (black) and 0.1 m NaH2PO4 (red) at a scan rate of 0.05 V s−1. Each data point consists of a minimum of three repeats.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

fig05: The oxidation of silver nanoparticles on a glassy carbon electrode in 0.1 m NaNO3 (black) and 0.1 m NaH2PO4 (red) at a scan rate of 0.05 V s−1. Each data point consists of a minimum of three repeats.
Mentions: For the H2PO4− anion, its influence on silver oxidation dynamics is negligible. This can be observed from the voltammetric data obtained in 0.1 m solution of NaH2PO4 and presented in Figure 5. Despite a high concentration of dihydrogen phosphate ions (H2PO43−) and considerable content of hydrogen phosphates (HPO42−) (see Table S1 in the Supporting Information), the oxidation peak potential remained constant. This is likely due to the insignificant concentration of PO43− ions in solution. Thus, it can be concluded that PO43− ion has the strongest effect on silver oxidation dynamics among the three species.

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.