It has been claimed that melatonin reacts directly with hydrogen peroxide with a very high rate constant [Formula: See Text] Both these values were derived from inhibition by melatonin of peroxidase-catalyzed oxidation of Phenol Red by hydrogen peroxide, assuming that this inhibition is due to dir...
Most whitening agents contain hydrogen peroxide, which reacts with oxygen to bring about a chemical reaction. This reaction busts apart the staining compounds, allowing them to harmlessly dissipate - and leave a brighter smile behind. Whilewhitening produces immediate changes, they aren't going to ...
A composition for dyeing keratinous fiber which includes incorporated therein an oxidative color-developing substance, an enzyme which reacts with oxygen as a substrate but does not evolve hydrogen peroxide, and a weak reducing agent.Joji Mitamura...
H2CO3 and HCO3- are used to create a buffer solution. When an acid is introduced into this buffer, which of H_2CO_3 and HCO_3^- reacts with the acid to maintain the pH of the solution? Carbon dioxide combines with water to form: a. carbonic acid. b. carboxlyic acid. c. s...
Unless it contains hydrogen peroxide. However, most don’t have this substance, and whitening toothpaste rarely whitens teeth. How Long Does Teeth Whitening Last? The response is, “it depends,” which may be a little annoying. Teeth whitening can last up to two years or as little as six...
(SpectraMax M5, Molecular Devices, Downingtown, PA, USA) at 405 nm. CAT activity was expressed as U/mg protein based on the rate of decrease in the hydrogen peroxide. SOD activity, total antioxidant capacity (T-AOC), and the GSH:GSSG ratio were measured with commercial assay kits (Nanjing...