Friday, 4 July 2014

Ideal Temperature for Bacteria to Multiply

Bacteria have varying requirements in terms of the range of temperatures in which they will grow. Those which grow at low temperatures (usually below 20°C) are calledpsychrophiles and at high temperatures (above 45°C) are thermophiles. Some spoilage bacteria fall into these categories.
Most pathogens, however, like warmth and are known as mesophiles. They will grow at temperatures between 5°C and 63°C, commonly referred to as the growth or 'dangerzoneand have an optimum temperature for growth of about 37°C. Listeria bacteria will grow very slowly below 5°C, but most pathogens become inactive (dormant) at low temperatures. They start to multiply more rapidly as the temperature rises.
At a temperature of about 37°C (human body temperature) pathogens multiply most quickly but as the temperature continues to rise, their rate slows down and they will stop growing altogether above 63°C. However, in order to destroy bacteria, temperatures must rise further. A temperature of 70°C for 2 minutes is recommended as a means of killing pathogens during the normal cooking process. (http://archive.food.gov.uk/ N.D.)

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