The science of nutrition and healthy eating
The science of nutrition and healthy eating

Start this free course now. Just create an account and sign in. Enrol and complete the course for a free statement of participation or digital badge if available.

Free course

The science of nutrition and healthy eating

2.8 Do the liver experiment

You can see the action of one type of enzyme for yourself. But first, here is some background information.

Hydrogen peroxide is a harmful by-product of many normal chemical reactions that happen in the cells of our body. It needs to be eliminated as quickly as possible.

The enzyme that breaks down hydrogen peroxide is called catalase. (Despite the earlier information about how enzymes are named, this one does not break down cats!) One catalase molecule can break down about five million molecules of hydrogen peroxide in one second. The breakdown products are water and oxygen and, because oxygen is a gas, the activity of catalase can be detected by looking for bubbles.

One place in the body where many reactions occur is the liver. It also has a particularly high concentration of catalase. So, if you would like to do this yourself, you will need some uncooked liver and some hydrogen peroxide. The easiest source of hydrogen peroxide is in some types of contact lens soaking solution. You will need to check the ingredients to be sure. Alternatively, you may be able to buy dilute hydrogen peroxide from a pharmacy.

If you put a tiny bit of raw liver on a plate and add a few drops of contact lens fluid, you should see a reaction quite clearly. You can scale it up if you like, in a jar or glass tumbler, by dropping a bigger piece of liver into some hydrogen peroxide solution (see the next video).

Download this video clip.Video player: Please note this video has no spoken audio.
Please note this video has no spoken audio.
Interactive feature not available in single page view (see it in standard view).

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has 50 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to University-level study, we offer two introductory routes to our qualifications. You could either choose to start with an Access module, or a module which allows you to count your previous learning towards an Open University qualification. Read our guide on Where to take your learning next for more information.

Not ready for formal University study? Then browse over 1000 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus371