Fermenters AQA GCSE Biology

Microorganisms can be used to grow Mycoprotein (meat substitute)

• Mycoprotein is a single celled fungi.
• A fungus called 'Fusarium' is the main source of mycoprotein.
• In a fermenter, glucose is supplied t the mycroorganisms as food.
• The fungus respires AEROBICALLY.
• It is very important ot to let any other icroorganisms contaminate the fermenter, so EVERYTHING IS STERILISED.

Penicillin is made using Mould grown in Fermenters.

• The mould is called Peniccilium Chrysogenum. The mould produces the antibiotic.
• Grown in a liquid culture medium containg sugar, and other nutrients.
• The sugar is used up as the mould grows.
• Only when the mould is running out of nutrients does it start to make penicillin.

Microoorganisms are grown in fermenters on a large scale.

Features are:

• Food provided in the form of a liquid culture medium, more can be pumped in.
• Air pumps supply oxygen to the microorganisms.
• Microorganisms produce heat so the fermenter must be cooled. (cold water jacket) the temperature is monitored with instruments.
• The righ PH is needed, instruments measure this.
• Sterile conditions are needed to prevent contamination.
• To stop the microorganisms from sinking down to the botton, a stirrer keeps them moving, and also maintains the temperature.