Enzyme demonstration

Using the enzyme catalase which is found concentrated in mammalian livers.

This enzyme speeds up the breakdown of toxic hydrogen peroxide into harmless water and oxygen. In the following pictures keep you eye on the tubes - that's where the reactions are taking place. I guess the main point displayed in the photos is that enzymes operate at very fast speeds this enzyme can catalyse the reactions of nearly 100,000 molecules a second.

Here hydrogen peroxide, manganese dioxide and fairy liquid are in the large tube. Manganese dioxide is a chemical catalyst. The height of the foam shows the rate of reaction
  Here I'm adding the hydrogen peroxide to the catalase and fairly liquid.We can compare this reaction with the chemical one by looking at the tube with foam in it.
  The reaction's just beginning - I'm looking a bit concerned, surely the enzyme reaction will be faster than the chemical one. If not this class will think I'm a right chimp.
  Looks like I'm not a chimp the enzyme reaction does proceed at a faster rate. Enzymes work by lowering the activation energy required for a reaction to proceed
  Here we go trying to prove the gas is oxygen. Add the liver as a source of catalase.
  Show off the hydrogen peroxide before pouring it in. I have to apologize for the slightly cheesy looking grin - sorry folks
  The reaction gives off a gas that relights a glowing splint - ie oxygen.


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