PRS SPE Cartridge

Strong Cation Exchange Without Aromatic π-π Interference

PRS SPE cartridges use propylsulfonic acid bonded silica to provide strong cation exchange retention for weakly basic and positively charged analytes. Unlike conventional benzenesulfonic acid SCX sorbents, PRS phases do not contain aromatic rings, significantly reducing unwanted hydrophobic and π-π secondary interactions.

This difference is especially important for:

• Weak bases
• Pyridine-containing compounds
• Basic dyes
• Cationic veterinary drug residues
• Alkaline pharmaceutical compounds

Because PRS minimizes non-polar retention, it often provides cleaner extracts, improved recoveries and more selective retention compared with traditional aromatic SCX sorbents.

Why Choose PRS Instead of Conventional SCX?

PRS SPE is often selected when conventional SCX SPE cartridges show excessive hydrophobic retention, poor recovery of weak bases or heavy matrix interference.

Typical Target Analytes

Sorbent Chemistry & Retention Mechanism

Key Features

• Strong cation exchange retention for weakly basic and cationic analytes
• Minimal aromatic interaction improves selectivity for pyridines and weak bases
• Cleaner extracts with reduced matrix background
• Excellent recovery of malachite green and crystal violet
• Higher tolerance for organic wash solvents compared with aromatic SCX sorbents
• Suitable for LC-MS/MS and HPLC sample preparation
• Wide cartridge format range from 100 mg / 1 mL to 2 g / 12 mL

How PRS SPE Improves Weak Base Recovery

Traditional aromatic SCX sorbents contain benzene rings that contribute additional hydrophobic and π-π retention mechanisms. While useful for some analytes, these secondary interactions can cause excessive retention and incomplete recovery of weakly basic compounds.

PRS phases eliminate these aromatic interactions by using an aliphatic propyl linker. Retention is driven primarily by ionic interaction, making elution more predictable and reducing background interference from hydrophobic matrix compounds.

This is particularly beneficial for:

• Pyridine derivatives
• Basic heterocyclic compounds
• Weakly retained cationic analytes
• Trace residue analysis in complex biological matrices

Typical Applications

• Aquaculture residue testing– malachite green and crystal violet in fish and shrimp
• Environmental monitoring– cationic dye analysis in water samples
• Pharmaceutical cleanup– extraction of weakly basic APIs and metabolites
• Clinical toxicology– basic drug extraction from plasma and urine
• Food safety testing– veterinary drug and dye residue enrichment
• Analytical method development– selective cleanup for weak bases

Standard PRS SPE Workflow

1. Condition– methanol followed by water or acidic buffer
2. Equilibrate– adjust cartridge to acidic pH where analytes remain protonated
3. Load– apply aqueous or diluted sample solution
4. Wash– remove neutral and weakly retained matrix compounds
5. Elute– use basic organic solvent such as ammonium hydroxide in methanol

Because PRS minimizes hydrophobic retention, stronger organic wash conditions can often be used without analyte loss, improving extract cleanliness.

Available Cartridge Formats

Compatible with standard SPE manifolds, positive-pressure systems and automated SPE workstations.
Download PDF Datasheet

B2B & OEM Supply Advantages

• ISO 9001 controlled manufacturing
• Consistent ion exchange capacity and particle size distribution
• Direct replacement for major PRS SPE brands
• Stable batch-to-batch selectivity
• OEM cartridge filling and private label packaging available
• Bulk sorbent supply for distributors and kit manufacturers
• Batch-specific COA and lot traceability
• Fast delivery for standard cartridge formats
• Free evaluation samples for qualified laboratories

Frequently Asked Questions