HPLC Columns

Polaris® Polar Modified Columns
Why compromise?

•	Improved Selectivity
•	Guaranteed Reproducibility
•	Dependable Column Life
•	Easy Scale Up
Polar - modified Phase Polaris phases are based on ultra-pure silica to which polar modified alkyl chains are bonded. The resultant packing material contains a surface, which is easily "wetted" with polar eluents and shows unique selectivity for polar compounds. Furthermore, the polar groups shield reactive silanols from polar silanophilic compounds, which improves peak symmetry.

Superior and Balanced Performance
Instead of the phase collapse commonly encountered with standard reversed phase columns, Polaris bonded phases remain fully extended in the aqueous phase, allowing increased yet mild interaction between sample and bonded phase. As such, Varian Polaris columns provide stable retention - even in 100% aqueous conditions - with excellent peak shape and selectivity.

The unusually durable Varian Polaris phase is able to withstand high-impact conditions of fast gradient applications, thereby extending column life. Its robustness makes it extremely well suited in high-throughput applications, such as mass drug screening procedures.

Flexible Chromatography
Varian Polaris comprises a wide range of products for high-quality, flexible chromatography. Polaris packing material is available in particle sizes of 3, 5, 10, 15, and 25 micron. All particle sizes are available as pre-packed columns ranging from 30 mm to 250 mm length and from 1.0 mm to 50 mm ID. The 10 and 15-micron particle sizes are available as bulk packing material.

Polaris can be used in the pH range from 1.5 to 10.0, and with mobile phase conditions of 0% up to 100% aqueous. A number of phases are available to suit all your chromatography needs. Generally speaking, C18-A is the most universal phase whereas C8-Ether and C18-Ether are often the best choice for hard resolve organic acids. The C18-Amide delivers maximum retention for the most polar basic compounds.

One of our latest innovations, Polaris C18-B, is a second generation phase with excellent batch-to-batch reproducibility, enhanced retention of the polar compounds, improved peak shapes for basic analytes, and further improved stability.

Quality Control and Guarantee Performance
All Varian Polaris columns are produced with careful attention to detail. All the raw materials are sourced, validated and tested for purity and consistency. Discriminating in process testing methods ensure every step is identical to the last one. Each column is subjected to a series of selectivity - and stability tests to guarantee the column performance. These stringent specifications mean that your methods can be reproduced, column after column, batch after batch, and from laboratory to laboratory.