COSMOSIL

Importance of the Topic

The separation efficiency and selectivity offered by modern HPLC columns are essential for the accurate identification and quantification of a wide variety of analytes, from small organic molecules to complex biological macromolecules and advanced materials like fullerenes and carbon nanotubes.

Objectives and Overview

This article surveys the COSMOSIL column portfolio developed by Nacalai Tesque since 1980, highlighting key milestones, the full range of stationary phase chemistries, and the broad application scope of these HPLC, UHPLC, SFC, and size-exclusion media.

Methodology and Instrumentation

COSMOSIL utilizes high purity spherical silica and core–shell particles across monomeric and polymeric bonded phases, including C18 variants, specialty phases (cholesterol, pentabromobenzyl, naphthyl, etc.), chiral selectors, normal phase agents, HILIC, sugar and amino columns, protein and peptide media, fullerene and CNT columns, preparative packing, and SFC phases. Performance was assessed using standard HPLC/UHPLC systems with UV, ELSD, MS and RI detection under optimized mobile phases.

Main Results and Discussion

COSMOSIL innovations include acid- and aqueous-stable polymeric C18-AR-II, low aqueous retention C18-PAQ, rigid cholesterol and π-phase selectivity for isomer separations, core–shell UHPLC performance with half the back pressure, high-pH tolerant COSMOCORE phases, robust chiral separations on immobilized polysaccharide derivatives, sensitive HILIC retention of polar analytes without ion pairing, efficient saccharide analysis on Sugar-D and NH2-MS, RNA size exclusion and RP purification media, protein and peptide columns with wide pores and strong end-capping, and specialty columns for fullerenes and CNTs. SFC column chemistries demonstrate unique selectivity for aromatic, polar and low polarity compounds under supercritical CO2 conditions.

Benefits and Practical Applications

• Enhanced selectivity for challenging isomers and structural analogs.
• High chemical and pH stability for demanding methods.
• Improved efficiency and throughput from core–shell and sub-2 µm technologies.
• Specialty media for chiral, glycan, oligonucleotide, and protein analyses.
• Preparative and SFC solutions for scale-up and green chromatography.

Future Trends and Opportunities

The evolution of column materials will target even greater miniaturization for single-cell and on-column reactions, tailored phases for emerging therapeutic modalities, sustainable silica alternatives, and deeper integration with mass spectrometry and digital method development for high-throughput automated laboratories.

Conclusion

The COSMOSIL family offers a comprehensive toolbox for modern analytical challenges, combining innovative stationary phases, robust manufacturing, and applications across life sciences, environmental, food, and advanced materials research. Continued development will support next-generation separations and enable new insights across scientific disciplines.