Purospher® STAR RP-18 Endcapped HPLC Columns


Outstanding Stability for Maximum Flexibility

Merck:/Freestyle/LE-Lab-Essentials/Chromatography/LE-Chrom-Column Pillow-150x100-20140219.pngPurospher® STAR RP-18 endcapped HPLC columns are designed for universal use. They allow basic, neutral, and metal chelating compounds to be separated easily with simple mobile phases – without peak tailing! Based on high-purity silica, the columns offer best all-round retention characteristics, outstanding pH stability from pH 1.5 to 10.5 over a wide temperature range, and suitability for up to 100% aqueous mobile phases. Thanks to this combination, Purospher® STAR RP-18 endcapped HPLC columns allow high-throughput applications, and give you maximum flexibility in choosing the best chromatographic conditions for any separation.

Suitable for 100% Aqueous Mobile Phases

Standard reversed phase columns, particularly RP-18 columns, often suffer from bonded phase collapse when used with highly aqueous mobile phases. Purospher® STAR RP-18 endcapped provides stable retention with excellent peak shapes, combined with the selectivity of a classical RP-18 phase – even in 100% aqueous conditions.

Features and Benefits
  • Highest purity silica (99.999%) for excellent peak symmetry
  • High separation efficiency
  • Reproducible results from run to run and batch to batch
  • Best all-round performance according to Tanaka
  • Outstanding pH stability from pH 1.5 to 10.5
  • No phase collapse when using highly aqueous mobile phases
  • Good suitability for LC-MS applications

Specifications

Surface Chemistry

Merck:/Freestyle/LE-Lab-Essentials/Chromatography/LE-Chrom-Purospher Icon RP84-480x359-20140219.pngThe polymeric surface modification of Purospher® STAR RP-18 endcapped provides a virtually perfect coverage of the surface, thus preventing silanophilic interactions.

Comparison of Purospher® STAR RP-18 endcapped with other columns

Stability at Higher Temperatures

Even at a higher temperature, the long-term stability test for efficiency and retention over 15,000 column volumes clearly demonstrates the excellent stability of Purospher® STAR RP-18 endcapped columns. The data and graphs from this endurance test show no significant changes in efficiency and retention.

Stability at higher temperatures

 
 
Chromatography
Application Notes Finder
Search for chromatography applications by analyte, column type, detection method, sorbent type or any other search term:
 
GC Columns

Columns, solvents, standards & CRMs for GC
View our full line of GC products at sigma-aldrich.com

Learn more
HPLC Workflow Solutions - Stationary Phase

HPLC Workflow Solutions

Stationary Phase

Learn More