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  5. Thermo Scientific™ POROS™ XS Strong Cation Exchange Resin

Thermo Scientific™ POROS™ XS Strong Cation Exchange Resin

Product Code. 18466518 Shop All Thermo Scientific Products
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Product Code. 18466518 Supplier Thermo Scientific™ Supplier No. 4404337

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Description

Thermo Scientific™ POROS™ XS resin is the first high-capacity, high-resolution resin that allows loading to more than 100 mg/mL capacity in the presence of up to 15 mS/cm NaCl, while delivering unprecedented separation capability.

POROS XS resin is the first high-capacity, high-resolution resin that allows loading to more than 100 mg/mL capacity in the presence of up to 15 mS/cm NaCl, while delivering unprecedented separation capability.

A major improvement on traditional cation exchangers, POROS XS resin sets the standard for cation exchange chromatography.

  • Dynamic binding capacity leads to reduced column size, smaller footprint, decreased buffer usage, and reduced cycling
  • High resolution supports better product yield and improved impurity clearance
  • Robust salt tolerance allows improved process flexibility, alignment, and process flow streamlining
  • Low back pressure and linear pressure responses help improve scalability
  • Rigid polymeric bead with covalent surface chemistry makes for easier handling and packing, and superior physical and chemical stability, resulting in a robust manufacturing process

Dynamic Binding Capacity

POROS XS resin has a high binding capacity of more than 100 mg/mL, at 5% breakthrough, over a broad range of process conditions. Figure 1 demonstrates unparalleled binding capacity across a broad range of pH and salt conditions. Higher dynamic binding capacity was achieved by optimizing the base bead pore structure and surface chemistry.

High Resolution

Using an optimized 50 μm particle size, POROS XS resin maintains the superior resolving capacity of POROS HS resin (Figure 2) while overcoming the challenging impurity levels associated with high titer processes. Resolution is consistent across a wide range of operating flow rates (Figure 3) and maintained independent of protein load (Figure 4).

Robust Salt Tolerance

POROS XS resin has high and consistent protein capacity across a broad range of salt concentrations (Figure 5) up to 150 mM NaCl (15 mS/cm conductivity). The ability to load columns under higher conductivity reduces or helps eliminate the dilution of column feed streams or the removal of unit operations, such as tangential flow filtration. The optimized surface ionic capacity of POROS XS resin minimizes competitive binding between the protein of interest and the counterion, resulting in superior salt tolerance.

Specifications

Quantity 250 mL
Product Line POROS
Particle Size 50 μm
Content And Storage Store at room temperature.
Shipping Condition Room Temperature
Stationary Phase XS Ion Exchange Phase

Frequently Asked Questions (FAQs)

Are POROS analytical columns compatible with HPLC systems from Waters or Agilent?

All of the pre-packed POROS columns, regardless of column size or resin, have the same 10-32 female fittings on the column. Columns are compatible with Waters and Agilent HPLC systems. You will need 1/16 inch male fittings for the HPLC to attach the column.
For any POROS analytical column, is the column compatible with an AKTA or Avant purification system?

All of the pre-packed columns, regardless column size or resin, have the same 10-32 female fittings on the column. They are all compatible with the AKTA instrument platform, however due to the column volume of the 2.1 mmD x 30 mmL columns (0.1 mL), these will not perform well in AKTA or Avant purification systems due to the relative size of the hold- up volume in these systems. The smallest column (PEEK or SS) that could feasibly be used in these systems is the 4.6mmD x 50mmL (0.8 mL) format.
Are the pre-packed POROS CaptureSelect or any POROS analytical columns compatible with an UPLC or is the use of these columns limited to HPLC?

UPLC is typically described as chromatography with sub-2 µm particles, which drives higher efficiency/better separation independent of operating flow rate. As particle size decreases, backpressure increases so the UPLC systems tend to have higher pressure ratings compared to HPLC systems. The flow rates on UPLC systems would be sufficient for POROS columns. Pump capabilities are typically 0.1-1.0 mL/min, so not as fast as a HPLC, but sufficient. Hold-up volumes on UPLC systems are lower than HPLCs, so this can help with sensitivity and efficiency. So from a pressure and flow standpoint there should be no challenge to operate a POROS CaptureSelect column on a UPLC system.

That being said, care should be taken running POROS columns on UPLC systems. Higher pressure safety interlock MUST be set at the rated column pressure, typically 180 bar. HPLC column hardware is not rated to operate at the static pressures possible and typical on UPLC systems. A clog or the like on a UPLC system could generate unsafe pressures on any HPLC-rated column before the default UPLC safety pressure interlock is tripped.
What is the physical or mechanical stability of POROS resins?

The physical stability of POROS resins is high. Customers have agitated, with overhead mixing and or bottom gassing for long periods of time (5-10 hours) and have performed hundreds of diaphragm pump passes during stall packs. Keep in mind that agitation with any device that creates grinding and sheer, such as with a magnetic stir bar, is not recommended for any type of resin.
What should I do if a POROS column dries out or air is pumped onto the column?

POROS resins rehydrate quite well. Here is the procedure that we recommend:

1. Flow 5% ethanol over the column at ?350 cm/hour for 3 CVs, followed by water or 0.1 M sodium chloride at 300 cm/hour for 3 CVs.
2. If baseline noise is still present, flow 20% ethanol over the column at 300 cm/hour for 3 CVs, followed by water or 0.1 M sodium chloride at 300 cm/hour for 3 CVs.
3. If you have established column qualification tests and specifications, perform the tests after rewetting.
Can POROS resins be used to purify large biomolecules?

In general POROS resins have behaved better for large biomolecules such as viral particles, fusion proteins, and globular proteins, where shape (not size) matters due to its unique pore structure and large pore structure as compared to traditional resins. As the target molecule size increases, capacities obtained will decrease. The large pore structure of POROS resins, which allows for convective flow (and therefore enhanced diffusion) is especially well suited for the purification of large biomolecules. POROS resins offer the best blend of high capacity (associated with chromatography beads) and improved chromatography efficiency (typically associated with monoliths or membranes). The average pore size for POROS resins is 1,000-3,600 Angstrom (100-360 nm) depending on the base bead/chemistry being utilized. For example, the molecular weight of IgG is 150 kDa and the molecular radius is 55 Angstrom. The molecular weight of IgM is ~900 kDa (pentamer), and the molecular radius is 120 Angstrom. So both of these biomolecules can interact with the pore structure associated with POROS materials.
How many uses should I expect out of my POROS or CaptureSelect column?

Resin lifetime depends on how the resin is used and the cleaning process that is employed. Therefore, each purification process will need to be evaluated specifically, especially if long lifetime is desired. Because binding can be different between resins, different cleaning schemes may be needed. An unoptimized cleaning process of any resin may yield <5 uses, and an optimized cleaning process can yield a hundred cycles or more. Discoloration of resin can occur for different reasons from process compounds such as metals like iron (Fe2+/3+) and copper (Cu2+), additives to the media (like vitamin B12 and folic acid), and elution solutions (like magnesium chloride, Mg2+). We can provide recommendations that have proved helpful for many customers to optimize the life of their POROS or CaptureSelect column.
What type of column do you recommend for POROS 50 µm resins? Do I need a high pressure column for POROS resins?

POROS resins are mechanically rigid and incompressible and can be packed effectively in low-pressure glass columns and in high-pressure stainless steel columns. The lack of wall support with increasing column diameter has minimal impact on chromatography performance because the beads support themselves, allowing for flexible column packing approaches and consistent and robust results. Columns can be packed with traditional flow pack, axial compression, or pack-in-place/stall pack packing methods.
What are the benefits of POROS chromatography resins in a manufacturing process?

Increased titers and product demand have caused substantial bottlenecks in downstream processing for a range of biomolecules. POROS chromatography resins address these challenges with solutions that help maintain performance and add process flexibility. Due to the polymeric nature of the backbone and the way we attach the ligands, the beads have very robust physical and chemical stability. This allows for aggressive solutions to be used, if needed, to improve cleanability and thereby increase resin lifetime/reuse. Our ion exchange resins are the go-to resins in downstream monoclonal antibody and recombinant protein chromatography where capacity, resolution, and yield are critical. We are also working on a new line of hydrophobic interaction resins that may be of interest for future projects that will be a best-in-class product for capacity and resolution with an added benefit of being able to load under lower salt concentrations and faster flow rates. We are also a strong partner when it comes to quality and supply of our products.
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