[HTML][HTML] Reaction kinetics of sodium ascorbate and dental bleaching gel

A Freire, EM Souza, DB de Menezes Caldas… - journal of dentistry, 2009 - Elsevier
A Freire, EM Souza, DB de Menezes Caldas, EAR Rosa, CFW Bordin, RM de Carvalho
journal of dentistry, 2009Elsevier
OBJECTIVE: The aim of this study was to establish the reaction kinetics of 35% hydrogen
peroxide and sodium ascorbate and to determine the mass of antioxidant required to
neutralize the bleaching gel. METHODS: The method used to quantify sodium ascorbate
was based on the United States Pharmacopeia (1995) 26. Oxidation–reduction titration was
used to confirm the concentration of hydrogen peroxide and sodium ascorbate and to
determine the reaction kinetics between them. RESULTS: The results indicated a direct …
OBJECTIVE
The aim of this study was to establish the reaction kinetics of 35% hydrogen peroxide and sodium ascorbate and to determine the mass of antioxidant required to neutralize the bleaching gel.
METHODS
The method used to quantify sodium ascorbate was based on the United States Pharmacopeia (1995)26. Oxidation–reduction titration was used to confirm the concentration of hydrogen peroxide and sodium ascorbate and to determine the reaction kinetics between them.
RESULTS
The results indicated a direct correlation between the mass of hydrogen peroxide and that of the antioxidant agent. In addition, 5min of contact was sufficient to neutralize the hydrogen peroxide used.
CONCLUSION
This in vitro study showed that the amount of sodium ascorbate required for reduction of hydrogen peroxide is directly related to the concentration of the latter. In addition, the reaction kinetics between oxidant and antioxidant showed that a longer application time for sodium ascorbate does not influence the effectiveness of the reaction and that 5min is sufficiently long for this antioxidant to exert an antioxidant effect.
Elsevier
以上显示的是最相近的搜索结果。 查看全部搜索结果