• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

The effects of Garlic and Mint on bacteria

Extracts from this document...


Garlic and mint Introduction I am going to be trying to find out whether garlic has stronger antibacterial properties than mint. Mint has always been used in toothpaste and I will be trying to find out whether this is just because of the fresh breath it leaves you with or, because of its antibacterial properties. If garlic has stronger antibacterial properties why not put garlic in toothpaste? Plants have always been susceptible to infection by bacteria and fungi. The plants do everything they can to repel such attacks and it is known that several plants have antibacterial properties that could help humans. The cells the plant produce are either toxic to the bacteria or interfere with the bacteria's metabolism in some way. When you clean your teeth you can feel the mint numbing your mouth and gums, this obviously has some effect on bacteria, but would garlic be more effective? Hypothesis I think that garlic will have a greater antibacterial effect than mint. This is because garlic has a stronger flavour and is known to repel some larger organisms like mosquitoes. I think garlic will have a greater antibacterial effect than mint. Plan I plan to make a culture of bacteria on an agar plate. ...read more.


To do this we will need to sterilise the bench we are working on and have a Bunsen burner set to a blue flame on at all times. Whenever we use a piece of equipment it has to be sterile, if its not already we will have to dip it in the methylated spirits and then put it into the Bunsen flame to sterilise it. When the bacteria pot is open we will flame the neck of the pot and be careful not to put the lid down anywhere. We will then take what bacteria needed, re-flame the neck of the bottle and replace the lid. After we have completed the experiment the bench should be sterilised again. This will prevent any bacterial contamination. All used petri dishes have to be autoclaved to avoid environmental contamination. There are not many ethnical problems with this experiment because the use of bacteria is considered acceptable. Method First we will have to make the bacteria culture. To do this we will have to collect a bottle or test tube containing 15 cm3 of sterile nutrient agar, place the tube into hot water to melt the agar (agar melts at 97 degree C), allowing air to escape. ...read more.


E.coli on the other hand was effected more by garlic, having an inhibition zone of 131.4 mm, where as mint only had an inhibition zone of 119.1 mm. This supports my hypothesis because I thought garlic would have a greater effect due to its effect on insects. This is because the chemical in garlic is more toxic to E.coli than the chemical in mint. In this case garlic would be more effective to have in toothpaste. I think my results are reasonably reliable because I repeated each experiment 4 times and took the mean average, however some of the results are quite far spread. This suggests that my results aren't 100% reliable. There will be a small amount of human error due to measuring the inhibition zones. My results were similar to other students in the class. This supports my statement that my results are reasonably reliable. There are no major anomalies in my results therefore I was able to include all my results in calculating the mean. My results are reasonably accurate. If I had more time I would like to have tested more samples to increase the reliability. I would also have used a more accurate measuring instrument to measure the inhibition zone, removing human error. So my over all conclusion is that mint is most effective at killing bacillus subtilis and garlic is most effective at killing E.coli. Chris Wilde ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Living Things in their Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Living Things in their Environment essays

  1. Marked by a teacher

    The effects of disinfectants and antibacterial soap on bacterial growth

    5 star(s)

    Standard amounts were pipetted to ensure that each plate would have basically the same amount of bacteria added to it. The plates were labeled and incubated at 32' C (because 37' C had melted the agar on two out of three of our previous plates).

  2. Marked by a teacher

    Escherichia coli and antibiotic resistanceIntroduction:Escherichia coli, short E. coli is an important bacteria that ...

    5 star(s)

    A native organic population, whether be E. coli bacteria or insects is most susceptible to the new a type of foreign invasion because the organic population has previous experience with the new force and thus has no defense against it.

  1. Investigating Seed Germination. Hypothesis If there is water, oxygen and a suitable ...

    Reliability I can say that my experiment is reliable because I relied on three seeds instead of just trying to germinate one seed. This enables my results to be more accurate. There were no problems during the experiment and the lengths of the seedlings were similar to each other.

  2. An investigation into the antibiotic effects of penicillin and streptomycin on the bacterium Escherichia ...

    Wire loop This will be heated until it is red, to sterilise, and then used to withdraw the bacteria in the agar, from the original culture. Bottle containing E. coli on the surface of agar slope From this I will scrape a sample of the bacteria to be placed in

  1. The effect of osmosis on potatoes

    the same by using the same type of potato, which have been treated in the same way, e.g. have all been cut without being washed and peeled. * The mass of the potato is a dependent variable, and this means that it will be measured throughout the experiment.

  2. An Investigation into the water quality of the River Banwell in

    Record on raw data sheet the information given on the device. Method 2 1. Place each sample of water into separate beakers and keep them separate avoiding contamination. 2. Place a pair of tweezers into distilled water to avoid contamination and wear a pair of gloves to avoid contamination.

  1. Branded Bleach is more effective at killing E. coli than Non branded bleach - ...

    In the experiment cultures of E. coli are grown in Petri dishes lined with nutrient agar as a source of sustenance. Next the bacteria are exposed to paper discs which have been immersed in either branded or non-branded bleach. The active ingredients diffuse from their point of origin and take effect killing bacteria over a certain

  2. The aim of this investigation is to investigate how changing the temperature affects growth ...

    They are capable, as are all forms of life, of exponential or logarithmic growth where the numbers of a species double each generation (e.g. 1, 2, 4, 8, 16, 32, 64 etc.). Bacteria have the same basic nutritional requirements as all life which includes a source of oxygen, carbon (carbon

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work