New Rxi™ Fused Silica Columns

Ultimate High-Performance Fused Silica Capillary Columns

• Unsurpassed inertness for low-level acidic or basic compounds.
• Ultra-low bleed.
• Reliable performance, guaranteed column-to-column reproducibility.
• Guaranteed to work perfectly with retention time-locking software.

In recent years there have been few advances in capillary GC column technology. Through new, innovative technology, Restek has developed and optimized a column-making procedure that assures unsurpassed inertness, ultra-low bleed, and exceptionally reproducible columns, batch to batch.

Unsurpassed Inertness

Rxi™ columns improve chromatography for many acidic or basic compounds. Surface activity in a column is revealed by the sensitivity and peak shapes for analytes such as 2,4-dinitrophenol (acidic) and pyridine (basic). Sub-nanogram quantities of these compounds are a stringent test of inertness. Rxi™ columns' unsurpassed inertness allows analysis of acidic or basic compounds under the same conditions, as shown here.

		Figure 1  Rxi™-5ms columns have excellent sensitivity and symmetry for difficult compounds.

Ultra-Low Bleed

Bleed from Rxi™ columns is the lowest in the industry, simplifying trace-level analysis with mass spectrometric detectors (MSD, ion trap, etc.), electron capture detection (ECD), nitrogen-phosphorus detection (NPD), or other sensitive detection methods.

		Figure 2  Profiles for widely used columns prove Rxi™-5ms has the lowest bleed!

Totally Reliable Column-to-Column Performance

Chromatographers need to know every column they receive is going to perform in the same way as the column it replaces. Rxi™ column technology has enabled us to tighten our quality control standards, and guarantee reproducibility. Columns from each of three manufacturing batches show the excellent reproducibility assured by the new manufacturing process.

		Figure 3  Three manufacturing batches of Rxi™ columns show excellent reproducibility.

Guaranteed Quality and Reliability

Rxi™ columns are already proving to be the best columns on the market, for inertness, ultra-low bleed, and column-to-column uniformity. It is our promise and commitment to you that every Rxi™ column you receive will be exactly as good as the one it replaces.

Typical Applications

Alcohols, amines, aromatic hydrocarbons, bile acids, drugs, US EPA methods, esters, fatty acid methyl esters (FAMEs), flavors and aromas, glycerides, halogenated hydrocarbons, herbicides, hydrocarbons, organic acids, oxygenates, polynuclear aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), pesticides, phenols, polymers, solvents, steroids, sugars, sulfur compounds.

	RESTEK PRODUCTS Rxi™ GC Columns Rxi™-1ms Rxi™-5ms   ALSO OF INTEREST Sensitive GC/MS Analysis for Drugs of Abuse Rxi™ Columns: Revolutionary Thinking Excellent Responses in GC/MS Analysis of Semivolatiles Analysis of Semivolatile Organics   RESTEK TECHNICAL   ARTICLES View all articles
	Introducing... Restek's exceptionally inert (Rxi) fused silica capillary columns: In addition to control of inertness and bleed, column-to-column uniformity has been elusive - see editorial The "Replacement" Column A Recurring Problem in Gas Chromatography, by guest editor Professor Walter Jennings. The processes we use to make new Rxi™ columns enable us to guarantee highly uniform performance, column to column and lot to lot, including perfect match-up with retention time-locking software. It is our promise and commitment to you that every Rxi™ column you receive will be exactly as good as the one it replaces.