Dionex Corporation is pleased to announce the introduction of the SolEx^TM solid-phase extraction (SPE) hydrophilic reversed-phase (HRP) on-line cartridge for fast and easy pre-concentration of contaminants prior to HPLC analysis. This new resin combines the advantages of a wide pH range polymer phase and the 100% aqueous-compatible surface chemistry for an easy-to-use SPE cartridge. This unique chemistry does not require methanol preconditioning since no dewetting occurs. The result is excellent retention of polar to more hydrophobic analytes.

Water contaminants, including pesticides, antibiotics, pharmaceuticals, etc., are of great concern to society and must be monitored. Water samples often require preconcentration before analysis due to the low levels of contaminants and the low method detection limits (MDLs). SPE is one of the most important techniques for sample enrichment because it overcomes many of the disadvantages of liquid-liquid extraction. The SolEx on-line, high-pressure cartridge is designed for use in HPLC analysis.

The new SolEx SPE cartridges are packed with a divinylbenzene polymer with a hydrophilic bonded layer that provides a stable resin bed with no dewetting. This resin shows excellent retention properties from polar to more hydrophobic analytes. The convenient cartridge style fits in a holder and is easily exchanged when necessary. On-line preconcentration features include:

• Superior capability for preconcentration of compounds
• Broad range of compounds: polar to hydrophobic analytes
• Rugged
• High capacity, good recoveries
• Wide pH compatibility (1-14)
• Wide range of applications

For more details, visit www.dionex.com.

Dionex (NASDAQ:DNEX) is a global leader in the manufacturing and marketing of liquid chromatography and sample preparation systems, consumables, and software for chemical analysis. The company's systems are used worldwide in environmental analysis and by the life sciences, chemical, petrochemical, food and beverage, power generation, and electronics industries. Our expertise in applications and instrumentation helps analytical scientists to evaluate and develop pharmaceuticals, establish environmental regulations, and produce better industrial products.

SolEx is a trademark of Dionex Corporation.