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Disinfectant concentration and bacteria resistance Featured science projectScience project video


The results show that a higher concentration of dettol disinfectant result in a larger inhibition zone. However there is no significant change in the relative sizes of the inhibition zones after 4 generations - indicating no change in bacteria resistance.

Dettol disinfectant concentration Diameter of the area around the filter paper disc without bacteria growth (mm)
  1st Generation 2nd Generation 3rd Generation 4th Generation
25% 32 33 32 31
50% 37 38 35 37
75% 48 46 50 49

Plot your results into a graph as shown below

bacterial resistance science fair project

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Complexity level:
Project cost ($):
Time required:
1 day for preparation, 8 days for the science project experiment
Material availability:
Access to laboratory equipment (eg. petri dishes)
Safety concerns:

Always follow laboratory safety guidelines and always practice sterile technique when handling microbes. Never have any food or drink at your workstation and always thoroughly wash your hands with disinfectant soap or alcohol before leaving your workstation. Always dispose of used material in a biohazard bag. If none are available, the bacteria should be destroyed with bleach before being disposed of.