RSA™ is different from Siliconized or Silanized Vials in some ways and similar in others. It depends on why you are using Siliconized Vials if you should use RSA or RSA-Pro™ (Surface Treated RSA Vials).

If your sample is proteins or peptides that stick to the Vials, you may need our RSA-Pro™ Vials. Some proteins stick to the glass and not to the Silanols or the Silicate layer in ordinary glass. Due to the Silicate layer and “glass dust” in ordinary glass, silanizing is often not 100% effective. Customers that need Silanized glass find the RSA-Pro Vials to be incredibly effective and offers better RSD of quantitation. The reason is much better or more complete coverage and no delamination of the surface treatment. Sample recovery is usually much better than ordinary Silanized Vials.

Some points to consider for Basic Analytes:

  1. RSA™ Glass eliminates the Hydroxyl Groups/Silanols on the glass surface and reduces overall “interactions” of Basic Compounds including adsorption.
  2. RSA Vials are much less hydrophobic and has a different surface tension from ordinary glass vials thus reducing some hydrophobic/hydrophilic interactions.
  3. RSA Vials do not need to undergo a “cleaning step” to remove the Silicate Powder or Particles that is formed with ordinary vials since the precision manufacturing process does not produce any excess Silicate. It is important to note that the introduction of any liquids or air into the Vials during any Cleaning Process will only re-introduce Organic Contaminants that can be problematic for LCMS or any sensitive sample.

There have been many cases where ordinary Pharma grade Silanized Vials were used to stop the pH drift or the Adsorption of basic analytes due to the Hydroxyl Groups/Silanols and RSA Vials performed much better.

See more information about RSA Glass Autosampler Vials