
Bacteria on Wooden vs. Plastic Chopping Boards
Hard
Do wooden chopping boards hold fewer bacteria than plastic ones? Many people assume plastic is cleaner. This project puts that idea to the test.
You cut chicken on both wooden and plastic boards. Then you clean each board a different way. One gets water alone. Others get dish soap or Dettol or bleach. You swab each board and grow the bacteria in petri dishes for five days.
After five days you measure the bacteria colonies. The results show which board type stays cleaner.
Hypothesis
The hypothesis is that wooden chopping boards have less bacteria compared to old plastic chopping boards.
Method & Materials
You will prepare 8 petri dishes, label them, and place them in a refrigerator. You will also label 4 wooden and 4 plastic chopping boards. Place a piece of chicken on each board and cut it several times with a knife. Clean the boards with different methods and rub a swab on each board and then roll it on the petri dishes. Keep the petri dishes in a cool, dark place for 5 days.
You will need 8 agar petri dishes, 8 disinfected swabs, 1 bottle of disinfected water, 4 used plastic chopping boards, 4 used wooden chopping boards, tap water, 1 bottle dishwashing soap, 1 bottle of Dettol soap, 1 bottle of bleach, 8 pieces of chicken, 1 knife, and 1 marker pen.
Results
The results show that the wooden boards have less bacteria compared to the plastic boards no matter what method of washing is used. It is also observed that bleach is the most effective cleaner for the removal of bacteria from the chopping board's surface.
Why do this project?
This science project is interesting because it shows how different cleaning methods can affect the amount of bacteria on chopping boards. It also shows that wooden chopping boards are safer than plastic chopping boards.
Also Consider
Variations of this science project could include using different types of boards like ceramic or glass, or using other cleaning agents such as antibacterial soap, Listerine or Clorox.
Full project details
Additional information and source material for this project are available below.Related videos
These videos explain the science behind this project and demonstrate key concepts used in the experiment.
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