Use of galacturonate and or galacturonate polymers in conjunction with carbohydrates to control metabolic state of organisms

A method of controlling a metabolic process, the method comprising:

• providing an anaerobic organism;
• providing a first chemical substrate comprising a first oxidation state;
• providing a second chemical substrate comprising a second oxidation state, wherein the first oxidation state is different from the second oxidation state;
• co-feeding the first chemical substrate and the second chemical substrate together at a predetermined mixture ratio to the anaerobic organism to produce at least one fermentation product;
• and
• controlling regeneration of reduced electron carriers in cells of the anaerobic organism caused by the anaerobic organism's metabolism of co-utilization of the first chemical substrate and the second chemical substrate,
• wherein the anaerobic organism is capable of co-utilizing the first chemical substrate and the second chemical substrate to produce the at least one fermentation product naturally.

A method of controlling a fermentation process, the method comprising:

• providing a fermentative organism;
• co-feeding the fermentative organism with a mixture of at least two feedstock materials;
• and
• controlling a fermentation process of the fermentative organism based on a ratio of the at least two feedstock materials,
• wherein the fermentative organism is capable of co-utilizing the at least two feedstock materials naturally.