Agilent, PL1180-1301, AdvanceBio SEC 300Å, 7.8 x 50 mm, 2.7 µm, LC guard column

The Agilent AdvanceBio SEC 300 Å Guard Column provides an upstream protective bed for compatible size-exclusion chromatography methods. Its 7.8 × 50 mm format uses 2.7 µm particles with a nominal 300 Å pore size, matching the general stationary-phase characteristics of the corresponding AdvanceBio SEC analytical column. The short guard captures particulate matter and some sample contaminants before they reach the longer, higher-resolution packed bed. This approach is particularly useful for protein and monoclonal antibody samples whose preparation matrices may introduce trace solids or materials that compromise column performance. Connect the guard in the correct flow direction and minimize unnecessary connecting volume to preserve peak shape. Use filtered mobile phases and appropriately clarified samples to prevent premature pressure increase. Replace the guard when backpressure rises or separation performance changes despite normal instrument operation. Because its packed length is only 50 mm, the guard does not provide the resolving power of a full 300 mm analytical SEC column and should not be substituted for one.