Hydrogen peroxide enzymatic decomposition

Videonummer 12081392
Hydrogen peroxide enzymatic decomposition, animation. The animation starts with a molecule of the inorganic chemical hydrogen peroxide (H2O2). Atoms are represented as coloured spheres joined by molecular bonds. This molecule consists of two atoms of oxygen (red) and two atoms of hydrogen (grey), with a single bond between the oxygen atoms and single bonds between each hydrogen atom and one of the oxygen atoms. The next stage of the animation shows molecules hydrogen peroxide and its decomposition reaction. Two molecules of hydrogen peroxide collide and react to break and form bonds. The products are two molecules of water (H2O) and one of oxygen (O2, forming a double bond). The third stages of the animation shows the human catalase enzyme speeding up the decomposition of hydrogen peroxide. The animation starts with a molecular protein model of the enzyme, with the heme groups highlighted. These groups contain Fe2+ iron ions (white). A molecule of hydrogen peroxide (H2O2) binds to the heme group. Hydrogen peroxide consists of two atoms of oxygen (red) and two atoms of hydrogen (white). The animation shows bonds breaking and forming with the iron. For each hydrogen peroxide molecule, one water molecule forms. The removed oxygen is left forming an iron-oxygen complex, which breaks up to form an oxygen molecule (O2), leaving the enzyme unchanged. The catalase is not used up, and acts as a catalyst and increases the reaction rate which is slow at room temperature. The final 30 seconds of the clip is a graph showing the effects of a catalyst on the energy state of the reaction as it moves between the reactants (left) and the products (right). The activation energy (Ea) is lower with the catalyst than without, increasing the reaction rate.
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / RHYS LEWIS, AHS, DECD, UNISA
Modell-Rechte: nicht erforderlich
Länge: 01:57 Minuten
Seitenverhältnis: 16:9
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