Purospher® STAR RP-18 Endcapped

Outstanding Stability for Maximum Flexibility

Purospher® 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

Purospher® STAR RP-18 Endcapped

Surface Chemistry

The 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