Fluorescence sensing of fermentation parameters using fiber optics.

Area of Science:

• Biotechnology
• Biochemical Engineering
• Analytical Chemistry

Background:

• Traditional fermentation monitoring relies on electrodes and off-line sampling, which can be time-consuming and disruptive.
• Accurate in situ monitoring of fermentation parameters is crucial for process optimization and control.

Purpose of the Study:

• To develop and validate a novel, non-invasive method for measuring key fermentation parameters.
• To enable real-time monitoring of dissolved oxygen, pH, and cell density during fermentation.

Main Methods:

• Utilizing fluorescent indicators sensitive to specific parameters (dissolved oxygen, pH) dissolved directly in the fermentation broth.
• Employing a fiber-optic probe fluorimeter to measure fluorescence intensity, correlated with parameter values.
• Implementing an integrated scatter scanning technique for in situ cell density monitoring.

Main Results:

• Demonstrated successful correlation between fluorescence measurements and dissolved oxygen, pH, and cell density values.
• Validated the method using simulated baker's yeast broth.
• Successfully applied the technique during actual baker's yeast fermentations.

Conclusions:

• The developed method offers a non-invasive, real-time alternative to traditional fermentation monitoring techniques.
• This approach facilitates improved process understanding and control in biotechnological applications.
• The integrated system provides a comprehensive solution for in situ fermentation parameter measurement.