Key Points for Troubleshooting Serum Separation Gel Not Flipping

Serum separation gel is an essential component of clinical blood collection tubes. During centrifugation, it forms a stable isolation layer between serum and blood cells with precise density, which facilitates direct sample testing and prevents continuous contamination of serum by cellular components. However, in practical use, there may occasionally be situations where the serum separation efficiency does not flip or flips poorly, and the reasons are often concentrated in several aspects such as formulation process, material aging, centrifugation conditions, and storage environment.

1, Formula and specific gravity control

The core function of serum separation gel depends on the precise design of its specific gravity. Under normal conditions, the density of serum separation gel is between serum and blood cells, and it can accurately move to the junction of the two when centrifuged. But if there is a deviation in the formula or process during the production process, resulting in the actual specific gravity deviating from the preset range, the serum separation gel may not float up enough or sink too much, and cannot form a complete isolation barrier. This defect usually exists when the blood collection tube is shipped, manifested as batch separation abnormalities.

2, Material aging and thixotropy attenuation

Serum separation gel is a polymer material with thixotropy, which can flow and deform under centrifugal force, and recover its structural strength after centrifugation stops. With the passage of time or improper storage conditions, serum separation gel will undergo a slow aging process, and its thixotropic performance will gradually decrease. The flow ability of aged serum separation gel deteriorates during centrifugation, making it difficult to migrate smoothly between serum and blood cells, or to form a dense sealing layer after migration. The attenuation of thixotropy is irreversible, and once it occurs, the actual performance of the separation adhesive has already been compromised.

3, Excessive or insufficient centrifugal force

Centrifugal conditions are the most direct operational factor affecting serum separation efficiency. When the centrifugal force is too high, the serum separation gel may be squeezed through the cell layer and settle to the bottom of the test tube, completely losing its isolation function. If the centrifugal force is too small or the centrifugation time is insufficient, the serum separation gel cannot obtain enough kinetic energy to move to the correct position and stay inside the serum layer or above the blood cell layer. Neither of these situations represents a quality issue with the serum separation gel itself, but rather a mismatch between the centrifugation parameters and product design requirements. Different brands or batches of blood collection tubes have their own recommended ranges for centrifugal force. Checking the instructions and calibrating the centrifuge before use can effectively avoid such problems.

4, Consideration of Reverse Centrifugal Force

In addition to conventional centrifugation, some laboratories may involve reverse centrifugation during sample processing, such as transferring serum to another test tube. If the minimum reverse centrifugal force threshold of the serum separation gel is too low, during the reverse operation, the gel may detach from its original position and contaminate the transferred serum sample with the flow of the liquid. This indicator determines the stability of the separation gel under non forward centrifugation conditions. For laboratories with special operating procedures, it is safer to choose products with higher resistance to reverse centrifugal force.

5, The impact of storage temperature

The performance stability of serum separation gel is closely related to storage temperature. Long term storage of blood collection tubes in high-temperature environments can accelerate the aging process of serum separation gel. High temperature accelerates the migration of small molecular components in polymer materials, changes the rheological properties of colloids, and reduces their thixotropic properties. As the storage temperature increases by one level, the aging rate will significantly accelerate. Therefore, blood collection tubes should be stored within the recommended temperature range, avoiding direct sunlight and heat sources. For batches with unclear transportation or storage conditions in summer, conducting sampling and centrifugation verification before use is an effective means of detecting problems in advance.

Hubei Xindesheng Material Technology Co., Ltd. has been deeply involved in the field of serum separation gel for many years. With professional research and strict production, we have created products with excellent performance and stable quality. We always uphold a rigorous and responsible attitude, providing high-quality serum separation gel for the medical testing industry. Choosing Hubei Xindesheng means choosing a professional, stable, and reliable medical testing guarantee. If you have any purchasing needs in the near future, please click on the official website to learn more details!