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Fermentation

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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...

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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...

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Computer-aided material balancing for prediction of fermentation parameters.

C L Cooney, H Y Wang, D I Wang

Biotechnology and Bioengineering

|January 1, 1977

Summary

This summary is machine-generated.

This study introduces a novel indirect method for measuring biomass concentration in fermentation. By utilizing material balances and monitoring gases like oxygen and carbon dioxide, it offers a sensor-free solution for biomass assessment.

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Area of Science:

Biotechnology
Biochemical Engineering

Background:

Accurate biomass concentration monitoring is crucial for optimizing fermentation processes.
Current limitations exist due to the lack of commercially available direct biomass sensors.

Purpose of the Study:

To develop and validate an indirect method for assessing biomass concentration in fermentation.
To provide a versatile and sensor-free approach for biomass estimation.

Main Methods:

Utilized material balances combined with direct monitoring of fermentation parameters (e.g., gaseous oxygen, carbon dioxide).
Employed established sensor technologies for indirect measurement, avoiding assumptions on cellular yield coefficients or rate constants.

Main Results:

The indirect method demonstrated feasibility for biomass assessment.
The approach requires only knowledge of substrate, cell, and noncellular product compositions.

Conclusions:

An indirect, material balance-based method offers a viable alternative for biomass concentration measurement in fermentation.
This adaptable approach eliminates the need for specific yield assumptions, enhancing its general applicability.