Talk:Fermentation
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Sections in quotes
The quoted paragraphs are from the 1811 Household Cyclopedia, and are way out of date. Originally, this article was just the Cyclopedia entry for 'fermentation', then I rewrote it, but I never got around to replacing that part.
--Johnkarp 01:00, 31 Dec 2004 (UTC)
Mistake
"Products produced by fermentation, such as ethanol and lactic acid, are used as a substitute for oxygen. During cellular respiration, oxygen is the final electron acceptor. However, when no oxygen is available, ethanol and lactic acid is used in place of oxygen."
That ain't true. The final electron acceptor is the pyruvate (for the lactic fermentation) and acetaldehyde (for the alcoholic fermentation).
- lactic fermentation : glycose -> pyruvate (via glycolysis) and then pyruvate -> lactic acid (and NADH->NAD+ in the same time => the one which receives the electrons is the pyruvate)
- alcoholic fermentation : glycose -> pyruvate (via glycolysis) then pyruvate -> acetaldehyde+ CO2 and finally acetaldehyde -> ethanol (and NADH->NAD+ in the same time => the one which receives the electrons is the acetaldehyde)
These products are in fact usually not used at all : the cell simply evacuates them. But indeed sometimes they are used. For exemple some cells, in contact with ethanol and oxygen, can use ethanol as a source of energy. Lactic acid can also be transformed : for exemple, in the liver of animals, it can be transformed back in pyruvate, then in glucose via the gluconeogenesis.
SafaRikas, April 2005
Brewing?
Why is there so much material here about brewing? It seems more appropriate to me to have it under 'brewing'.
--Johnkarp 22:56, 27 May 2005 (UTC)