Fermentation in food processing is the process of converting carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria under anaerobic conditions.
Or
Any metabolic process that releases energy from a sugar or other organic molecule, does not require oxygen or an electron transport system, and uses an organic molecule as the final electron acceptor
Fermentation usually implies that the action of microorganisms is desired.
The science of fermentation is known as zymology.
in microorganisms, fermentation is the primary means of producing ATP by the degradation of organic nutrients anaerobically
Fermentation in food processing is the process of converting carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria under anaerobic conditions.
Or
Any metabolic process that releases energy from a sugar or other organic molecule, does not require oxygen or an electron transport system, and uses an organic molecule as the final electron acceptor
Fermentation usually implies that the action of microorganisms is desired.
The science of fermentation is known as zymology.
in microorganisms, fermentation is the primary means of producing ATP by the degradation of organic nutrients anaerobically
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2. 4.6 Fermentation
Fermentation allows glycolysis to continue.
• Fermentation is an anaerobic process.
– occurs when oxygen is not available for cellular
respiration
– does not produce ATP
• Fermentation allows glycolysis to continue making ATP
when oxygen is unavailable.
3. 4.6 Fermentation
• Fermentation allows glycolysis to continue making ATP
when oxygen is unavailable.
• NAD+ is recycled to glycolysis
4. 4.6 Fermentation
There are 2 types of fermentation
• Named for the products produced
– Lactic acid fermentation
– Alcoholic fermentation
5. 4.6 Fermentation
• Lactic acid fermentation occurs in muscle cells.
– glycolysis splits glucose into two pyruvate molecules
– pyruvate and NADH enter fermentation
– energy from NADH converts pyruvate into lactic acid
– NADH is changed back into NAD+
6. 4.6 Fermentation
Energy and Exercise
Quick Energy
1. Cells contain only enough ATP for a few
seconds of intense activity
2. Then cells rely on lactic acid fermentation
(can supply for about 90 seconds)
3. Lactic acid build-up causes burning in
muscles. Only way to get rid of lactic acid is
chemical pathway that requires oxygen (why
you breathe heavy after heavy excercise.)
8. 4.6 Fermentation
Fermentation and its products are important in several
ways.
• Alcoholic fermentation is similar to lactic acid
fermentation.
– glycolysis splits glucose and the products enter
fermentation
– energy from NADH is used to split pyruvate into an
alcohol and carbon dioxide
– NADH is changed back into NAD+
– NAD+ is recycled to glycolysis
10. 4.6 Fermentation
• Yeast do alcoholic fermentation
• Fermentation is used in food production.
– yogurt
– cheese
– bread
11. 4.6 Fermentation
In cheese making, fungi or
bacteria are added to large vats
of milk. The microorganisms
carry out lactic acid
fermentation, converting some
of the sugar in the milk to lactic
acid.