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Antifoam for Fermentation to Solve Foaming
Apr 03, 2024
Fermentation refers to the process in which people use the life activities of microorganisms under aerobic or anaerobic conditions to prepare the microbial cells themselves, or direct metabolites or secondary metabolites. Fermentation is sometimes also called fermentation, and its definition varies depending on the occasion where it is used. Fermentation generally refers to a certain decomposition process of organic matter by organisms. Fermentation is a biochemical reaction that humans have been exposed to earlier and is now widely used in the food industry, biological industries, and chemical industries. It is also the basic process of bioengineering, i.e., fermentation engineering. Research on its mechanism and process control is still ongoing.
Reasons for foaming during fermentation:
1. Ventilate and stir, because the greater the ventilation, the more intense the stirring, resulting in a large number of bubbles.
2. During the fermentation process, the content of organic nitrogen sources is high, and the greater the viscosity and concentration of the fermentation liquid, the higher the stability of the foam generated.
3. When the bacteria grow vigorously, the protein concentration of the fermentation broth increases, and the concentration is enhanced, resulting in the generation of bubbles.
4. The cells of the fermentation tank are lysed, resulting in the release of a large amount of protein, the continuous expansion of the liquid, and the appearance of a large number of bubbles in contact with the air.
5. Affected by the environment, the temperature rises rapidly during fermentation, coupled with constant stirring during the fermentation process, resulting in increased bubbles.
Defoaming agent for fermentation is composed of polydimethylsiloxane, food emulsifier, dispersant, etc.
Reasons to use defoamer to solve foaming:
1. It overcomes the shortcomings of ordinary silicone defoaming agents, such as poor high temperature resistance and short foam suppression time, and can meet the requirements for foam control throughout the fermentation cycle.
2. The surface tension is small and has excellent diffusivity and permeability.
3. The economic benefits are obvious, and the dosage is small to control the cost.
4. During the fermentation process, the bacteria will not be harmed, and the growth environment of the bacteria can be improved.
The defoaming agent should have the following properties:
1. Strong defoaming power and low dosage.
2. Adding to the foaming system does not affect the basic properties of the system; that is, it does not react with the system being defoamed.
3. The surface tension is small.
4. It interacts with the surface in good balance.
5. Good heat resistance.
6. Good diffusion and permeability, high positive spreading coefficient.
7. Chemical stability and strong oxidation resistance.
8. Good gas solubility and permeability.
9. Little solubility in foaming solutions;
10. It has no physiological activity and is highly safe.
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