Chiralpak RSA 5µm 50x4.0mm HPLC Column

The Chiralpak RSA HPLC column 50x4.0mm, 5µmn uses rat serum albumin (RSA) as a precise immobilised protein modification on spherical 5 µm silica particles. The advantage lies in the investigation of drug-albumin interactions in a rat model under controlled aqueous RP-HPLC conditions; The limitation is its lower resistance to denaturing solvents, extreme pH levels and high mechanical stress. Chiralpak RSA is suitable for drug-protein binding studies, preclinical species comparisons and bioanalytical investigations. The Chiralpak RSA phase can be used in conjunction with HSA, BSA, MSA, PSA or DSA to evaluate albumin-dependent differences in selectivity.

Performance Characteristics and Advantages

• Protein-based chiral selectors for enantioselective reverse-phase HPLC
• Immobilized protein phases on spherical 5-µm silica
• Compatible with aqueous buffers, low levels of organic modifiers, and moderate pH values
• Enantioselectivity can be specifically optimized via pH, buffer type, and organic modifier
• Complementary selectors such as AGP, CBH, HSA, and animal serum albumin variants
• Suitable for drug discovery, purity testing, environmental analysis, and drug-protein binding studies

Additional Notes

Protein-based Chiralpak materials differ fundamentally from traditional amylose- or cellulose-based polysaccharide phases. The chiral selector is a protein immobilized on spherical silica particles. This creates complex binding sites where ionic interactions, hydrophobic interactions, and hydrogen bonds can contribute to enantiomer recognition. Since the protein selectors are immobilized, these are not merely coated surfaces. The advantage of immobilization lies in a more stable fixation of the selector during standard aqueous reverse-phase operation and in highly reproducible separation conditions. The disadvantage compared to more robust synthetic or polysaccharide-based immobilized phases is the narrower operating window: high concentrations of organic solvents, strongly denaturing solvents, extreme pH values, high temperatures, and excessively high flow rates should be avoided. The selectivity of protein-based Chiralpak columns can be controlled primarily by pH, buffer composition, and the type and concentration of the organic modifier. These mild, aqueous conditions make the phases particularly suitable for chiral active ingredients, bioanalytical applications, and protein binding studies; however, they require careful column maintenance and the use of appropriate sample solutions.

Legal Notices

Chiralpak is a registered trademark of Daicel Corporation, Osaka, Japan.