Project cost ($):
1 day to prepare, 3 days for experiment
The bacteria should be destroyed before it is disposed of. Pour some bleach into the petri dish to kill all the bacteria before disposing in the trash.
Table of Contents
This experiment was done to find out if leaving baby food out of the refrigerator after it has been opened will result in bacterial contamination.
Baby food will become more contaminated when it is left out for a longer period of time.
Food poisoning happens when we eat food that has gone bad. This food will have bacteria growing on it and it will smell bad. If we continue to eat it anyway, we will experience stomach pain, diarrhea and vomiting amongst other symptoms. Some types of bacteria commonly found in food are Escherichia coli, Listeria, Salmonella and Campylobacter.
Bacteria can be found in the environment all around us. Some of the bacteria is good for us but most of the bacteria found in food that has gone bad are harmful.
The presence of harmful substances like bacteria and chemicals in our food can lead to food poisoning. Carefully documented procedures are followed by food manufacturers to minimize the contamination of food by preparing and packing them in a sterilized environment. However, when we bring this food back to our homes and open them for consumption, the bacteria and other microbes in our surroundings come in contact with the food and lead to contamination. This is why canned and bottled food must be consumed as soon as possible, once opened.
Microbes, bacteria, Escherichia coli, petri dish
The materials required for this experiment:
The results show that the specimen that was left outside for 24 hours had the highest rate of bacteria growth. The specimen that was opened and left outside for 30 minutes had the second highest rate of bacterial growth and the specimen that was immediately placed in the refrigerator had the least bacterial growth. The chicken specimen had a larger bacteria colony then the pumpkin and apple specimens.
The hypothesis that baby food will become more contaminated when it is left out of the refridgerator for a longer period of time, is proven to be true.
The experiment can be repeated by using different brands of baby food.
Food poisoning - http://kidshealth.org/PageManager.jsp?dndsHealth&lic