Is homolactic fermentation the only one that doesn't generate CO2?

[Green Xenon]

Hi:

 

I've read that homolactic-acid fermentation does not produce CO2. Are there any other types of CO2-free fermentation pathways?

 

Also, is it possible to generate any of the following byproducts -- solely via anaerobic fermentation -- without producing CO2?:

 

1. Acetoin

2. Diacetyl

3. Butyrate

4. Valerate

5. Caproate

6. Propionate

7. Isovalerate

8. Isobutyrate

9. Acetate

 

 

Thanks,

 

GX

Edited September 7, 2011 by Green Xenon

[WorldOfBiochemistry]

Hi Green Xenon,

 

I don't think it will be possible to have those molecules as products of fermentation. Probably you will get some as metabolic intermediates in the catabolism of aminoacids, for example, but not fermentation.