How to Keep Apple Slices Looking Fresh

9 12 2010

Last Friday we learned about how copper in pennies reacts with oxygen in a process called oxidation, making the pennies darker.  Oxidation also causes apple slices to turn brown.  We are going to experiment to see what liquids can prevent apple slices from browning.

After cutting the apple, I submerged each slice in a different liquid.  I used one slice as my control sample, this slice was not placed in any liquids. Once the control had turned brown I compared it to the other slices. In the photo below the two slices on your right are the control.

Lemon juice contains citric acid which slows down the oxidation process so the slices do not turn brown. The lemon lime soda also contains lemon juice, so it has a similar affect. Can you think of any other mild acids that you could test?  The corn syrup coated the slice shielding it from the oxygen, limiting the oxidation process.

Try this experiment at home and leave a comment describing your results.




4 responses

13 02 2011

this is so awesome! i love it! i tried something sort of like this. i used lime juice, lemon juice, vegetable oil, and white vinegar. having apples in air-tight bags keep them from turning brown, too.

13 02 2011

That’s so cool! I think I’ll try it!

7 05 2011

thx im gonna use this now my family eats apples alot 🙂

11 08 2011
8th Grade Science Fair Projects

This is so cool.Thanks for posting this, a very helpful article and a good science project as well.

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