A simultaneous saccharification and fermentation model for dynamic growth environments

Area of Science:

• Biochemical Engineering
• Mathematical Modeling
• Microbial Physiology

Background:

• Saccharomyces cerevisiae is crucial in modern distilleries, with existing models lacking comprehensive dynamic simulation capabilities.
• Current mathematical models often fail to account for key variables like glucose, ethanol, and organic acid concentrations impacting yeast growth.
• A gap exists for a cybernetic model that integrates multiple factors influencing yeast cell growth dynamics.

Purpose of the Study:

• To develop a novel cybernetic model for simulating yeast (Saccharomyces cerevisiae) metabolism and growth.
• To incorporate critical variables such as temperature, pH, organic acids, inoculum levels, and glucose concentration into the model.
• To include substrate and product inhibition effects within the yeast metabolic simulation.

Main Methods:

• Development of a cybernetic model comprising 4 reactions and 11 metabolites.
• Simulation of yeast metabolism under varying environmental and substrate conditions.
• Inclusion of substrate and product inhibition dynamics within the model framework.

Main Results:

• Model simulations aligned with hypothesized trends and existing research findings.
• Predictions demonstrated continuity and convergence to expected outcomes across all simulated variable ranges.
• The developed cybernetic model exhibited stability under all tested simulation conditions.

Conclusions:

• The novel cybernetic model provides a robust framework for understanding Saccharomyces cerevisiae growth dynamics.
• The model successfully integrates multiple factors influencing yeast metabolism, offering improved predictive capabilities for fermentation processes.
• This research contributes a stable and versatile simulation tool for optimizing distillery operations and microbial process design.