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Topic: Alcoholic fermentation  (Read 7567 times)

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Offline aqhl

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Alcoholic fermentation
« on: October 18, 2006, 04:41:07 PM »
Hi, I have a small question. Why in alcoholic fermentation, only sugar 6 is transformed ? Which enzymes can transform sugar 6 ?

Offline Equi

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Re: Alcoholic fermentation
« Reply #1 on: October 19, 2006, 04:07:28 AM »
Alcoholproduction is just the very last step to regnerate NAD+ levels under anaerobic conditions. Hence, there are many enzymes involved.
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Offline aqhl

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Re: Alcoholic fermentation
« Reply #2 on: October 24, 2006, 03:57:39 AM »
Is there any enzyme that converts sugar 5 to alcohol ?

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Re: Alcoholic fermentation
« Reply #3 on: October 24, 2006, 08:41:49 AM »
Not to ethanol in one step, no.
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Offline aqhl

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Re: Alcoholic fermentation
« Reply #4 on: October 24, 2006, 02:09:46 PM »
ok, can you explain me how they are different ?

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Re: Alcoholic fermentation
« Reply #5 on: October 24, 2006, 04:46:18 PM »
I don't get it.

It would be extremely helpful if you phrase out your questions properly.
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Offline aqhl

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Re: Alcoholic fermentation
« Reply #6 on: October 25, 2006, 11:26:01 AM »
I have read a little about alcoholic fermentation. some bacteria can change sugar 5 to alcohol. but ferment, only change sugar 6 to alcohol. I dont know why ?

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Re: Alcoholic fermentation
« Reply #7 on: October 25, 2006, 04:30:34 PM »
A crucial step in many alcoholic fermentation is the decarboxylation of Pyruvate (C3 -> C2). Pyruvate is the endproduct of glycolysis. I guess that C5 sugars aren't processed in glycolysis and therefore no Pyruvate is produced. No Pyruvate, no acetaldehyde, no ethanol.

Take a look at some basic biochemistry or microbiology textbooks like Lehninger and Brocks respectively. They should have a some more detail on this matter.
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