Bio-Reaction Stoichiometry Balance Dialog

This dialog appears when you click on the  button from any fermentation operation reaction tab, to view or edit the reaction stoichiometry of the select reaction.

Variable Definitions, Ranges and Default Values

The following table shows a brief description of the variables appearing in this tab. The table also displays their default values and their generally acceptable range:

Symbol Key: ○ User-specified value (always input); ● Calculated value (always output); ◙ Sometimes input, sometimes output

Specification Choices / Comments

Through this interface you can specify the stoichiometry of a reaction. The Molar Coefficient and Molecular Weight columns are displayed only if the molar option is chosen for the reaction stoichiometry (instead of the mass).

Adding /Deleting Reactants and Products

Clicking on the  button in the reactants / products displays a list of available reactants / products that can be added to the reaction. Select a component to add it either as a reactant or a product. You can alter the stoichiometric coefficient of the component through the reactants table. Note that if a component is used as a reactant it can not be used as a product and vice versa. To delete a reactant or a product you first select it and then click on the button.

Stoichiometric Coefficients

Use positive coefficients for both products and reactants. Please note in this case the molecular weights of reactants and products must be accurate to the second decimal digit. The total mass of products and reactants is displayed below each table.

Extra-Cell (%)

This feature is useful when tracking of intracellular water is desired because it affects the performance of centrifugation, filtration, etc. further downstream. If the ‘Extra-Cell %’ of certain reaction product components is less than 100 (or in other words a fraction of the component is intracellular) and the ‘Primary Biomass’ and ‘Water’ components are identified (through the Pure Component Registration Dialog window), then the model automatically associates intracellular water with the intracellular reaction product components. Then, if a separator is used to remove intracellular components (i.e., removal of biomass by a centrifuge), the separation (removal %) of intracellular water will be the same as that of the intracellular component(s).

Register Pure Components

It is possible to introduce new pure components in the process by simply clicking on the button

. This will present you with the Pure Component Registration Dialog that allows you to register new pure components without exiting the stoichiometry balance and the operating conditions dialogs.