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How should food antifoaming agents be tested?
Release Date:
2020-11-12
People can perform qualitative or quantitative analyses of defoamers based on specific requirements. But do you know how to test food-grade defoamers? Defoamer manufacturers outline several of the most common testing methods.
People can conduct qualitative or quantitative analyses of defoamer properties based on specific requirements. So, do we really understand…? Food antifoaming agent should… How do you go about testing it? Defoamer Manufacturer A detailed introduction to several of the most common methods.
1. Shake‑Bottle Method: The simplest and most widely used approach is the shake‑bottle test. Add an adequate amount of the foaming solution to a stoppered graduated cylinder, then shake the flask up and down and from side to side at the same frequency each time. Allow the mixture to stand undisturbed and observe the foam’s height and width, as well as the foam‑stabilization and defoaming times.
II. Spouting Test: A bubbly aqueous solution is prepared to generate bubbles, after which a defoamer is added. The defoaming performance is evaluated based on the duration of foam suppression.
3. Circulating Pump Experiment: A bubbly aqueous solution is circulated through a closed-loop control system, with a defoaming agent added and agitation applied, and the foam height is measured. This method quantitatively evaluates foam‑suppressing performance under dynamic conditions of stirring, emulsification, and shear. While the solution circulates in the closed loop, the time required to reach a specified foam height is measured to assess the efficiency of foam suppression.
4. Precision Measurement Using a Hydrometer: Employ a hydrometer to accurately determine the specific gravity of the foam‑forming liquid mixture. The difference between this specific gravity and that of the foam‑forming liquid prior to mixing indicates the amount of foam produced; the greater the specific gravity difference, the higher the gas content in the mixture and the stronger the foaming power. The foam‑production rate is expressed as the percentage of this specific gravity difference relative to the specific gravity of the foam‑forming liquid before mixing. Additionally, measure the foam volume generated by the slurry after adding a defoamer; the difference between this value and the foam volume of the blank slurry represents the defoaming capacity. Finally, compare this defoaming capacity with that of the blank slurry to calculate the defoamer’s defoaming efficiency.
It must be acknowledged that soybeans, as a key component of concentrated feed, account for a substantial proportion of the total feed mix. However, are we fully aware that soybeans contain significant levels of trypsin inhibitors, lectins, goitrogens, and other antinutritional factors? Long-term consumption by young animals can lead to varying degrees of digestive disturbances, reduced digestibility and bioavailability of carbohydrates, vitamins, and other nutrients, and even growth retardation—symptoms collectively known as feed‑induced toxicity. These issues, in turn, have limited the use of soy protein in post‑weaning piglets.
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