Aijiren Syringe Filters for Chromatography

The Aijiren Syringe Filter is a comprehensive range of non-sterile disposable Syringe Filter for reliable sample preparation. Reproducible membrane quality and automated manufacturing processes ensure that particles are removed from all samples, extending the life of analytical columns and minimizing damage to injection ports and valves.

Aijiren Syringe Filter come in a variety of pore sizes. The most common used in physical chemistry laboratories are 0.2 um and 0.45um. In general, 0.45um is sufficient for most procedures. However, 0.2 um or 0.1 um is more appropriate if smaller particles may exist in the sample. If you need to filter small particle sizes (for example, to remove colloids), other types of filtration may be more appropriate. The larger the diameter of the filter will also increase the hold-up volume. This is the amount of liquid left in the filter after use. Filters with low hold-up volume are recommended for expensive liquids or liquids with limited use.

The diameter of the Syringe Filter is a good indicator of EFA and hold-up volume. When the particles are removed from the fluid, the pores in the Syringe Filter is blocked, reducing the available portion of the filter and eventually clogging the filter. Particle-containing fluids generally block the filter faster than "clean" fluids. You can increase the size of the filter (and/or EFA) to filter for more dirtier samples. When the pressure required to push the liquid into the filter is very high, the filter is likely to be clogged and needs to be replaced. If you press too hard, the filter may be damaged and so let particles through.

How is the pore size of the membrane determined? The easiest way to measure the pore size of the membrane is to use the bubble point test. The bubble point is the pressure at which the continuous flow of bubbles passes through a completely moist membrane. The bubble point test uses the inverse relationship between the bubble point and the pore size to determine the maximum pore size of the membrane. The bubble point of 0.45μm membrane is usually 10-25 psi, while the bubble point of 0.2μm membrane is 40-50 psi. Alternatively, sterile-grade membranes can be characterized by bacterial retention, utilizing bacteria of known size.

 

Our expert staff is available via live chat and email to help you decide on the best membrane Syringe Filter for your needs. Email us, and our helpful customer representatives will respond promptly—in just one business day or sooner. And if you still need help deciding on the right product, we’ll ship you a sample to ensure you receive the best membrane Syringe Filter for your needs.