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Selection of Specialized, High-Efficiency Fermentation Antifoaming Agents
Release Date:
2021-02-23
Specialized fermentation defoamers are produced through complex chemical reactions that integrate defoaming and foam‑inhibiting principles and technologies, making them a specific type of defoamer. Given the high temperatures typically encountered in fermentation systems, these products must exhibit excellent heat resistance. Common formulations used in the fermentation industry include polyether‑based, silicone‑based, and silicone‑ether composite types. They are required to deliver rapid defoaming with long‑lasting foam inhibition; withstand high temperatures as well as strong acids and alkalis; be free of adverse side effects while enhancing yield; and allow for low dosing and straightforward downstream processing.
Dedicated Fermentation antifoaming agent It is produced through complex chemical reactions that integrate multiple defoaming and foam‑suppressing agents, based on defoaming and foam‑inhibition theories and technologies, and thus belongs to the category of defoamers. Given the high temperatures typically encountered in fermentation systems, it must exhibit excellent heat resistance. Defoamers used in the fermentation industry include polyether‑based, silicone‑based, and silicone‑ether composite types. They are required to deliver rapid defoaming and long‑lasting foam suppression; withstand high temperatures as well as strong acids and alkalis; be free of adverse side effects and enhance yield; and allow for low dosages with straightforward downstream processing.
When selecting an antifoaming agent, the following criteria should be met:
1. Insoluble or poorly soluble in the foaming solution
To break bubbles, defoaming agents should concentrate and accumulate at the bubble film. For bubble‑breaking applications, they must achieve rapid concentration and accumulation; for foam‑inhibition purposes, they should maintain this state continuously. Consequently, defoamers exist in a supersaturated condition within the foaming liquid, and only compounds that are insoluble or poorly soluble can readily attain such a state. Only when insoluble or poorly soluble do they tend to adsorb at the gas–liquid interface, concentrate on the bubble film, and exert their effect even at low concentrations. For aqueous systems, the active ingredient should possess strongly hydrophobic yet weakly hydrophilic characteristics, with an HLB value in the range of 1.5–3, in order to be effective.
2. Surface tension is lower than that of the foaming liquid.
Only when the intermolecular forces of the defoamer are weak and its surface tension is lower than that of the foaming liquid can the defoamer particles penetrate and spread across the bubble film. It is worth noting that the surface tension of the foaming liquid is not the surface tension of the solution itself, but rather the surface tension of the foam‑stabilizing solution.
3. Exhibits a certain degree of affinity with the foaming liquid.
Since the defoaming process essentially involves a competition between the rate of foam collapse and the rate of foam formation, a defoamer must be able to disperse rapidly in the foaming liquid, thereby exerting its effect over a broad area. To ensure rapid spreading, the active ingredient of the defoamer should exhibit a certain degree of affinity with the foaming liquid. If the active ingredient is too compatible with the liquid, it will dissolve; if it is too incompatible, it will be difficult to disperse. Only when compatibility is just right can the defoamer perform effectively.
4. Does not undergo a chemical reaction with the foaming liquid.
The defoamer reacts with the foaming liquid; on the one hand, the defoamer loses its effectiveness, and on the other hand, it may generate harmful substances that inhibit microbial growth.
5. Low volatility and long-lasting efficacy
Defoamers are widely used in industries such as the food industry, papermaking, water treatment, oil extraction, textile dyeing, coatings, detergents, rubber latex production, aerosol manufacturing, personal care, pharmaceuticals, and dairy processing.
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