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New Rxi™ Fused Silica Columns: Restek chemists use new technology and stringent quality control to produce this new family of columns. Rxi™ columns have unsurpassed inertness for sub-nanogram on-column levels of active compounds, and assure reliable column-to-column performance.
Preventive Maintenance for GC: Professor Jennings explains the consequences of ignoring those enclosures included with a new column, and offers simple, proven, preventive maintenance options that help avoid downtime.
Excellent Responses in GC/MS Analysis of Semivolatiles: The newest members of our new line of Rxi™ columns, Rxi™-1ms columns, offer the same outstanding inertness, ultra-low bleed, and batch-to-batch reproducibility as our Rxi™-5ms columns. Rxi™-1ms columns provide excellent selectivity and symmetric peaks for the diverse chemicals that can make up a semivolatiles sample.
Analysis of Semivolatile Organics: Exceptional inertness and ultra-low bleed enable an Rxi™-5ms column to resolve sub-1ng quantities of acidic or basic analytes under a single set of conditions. In this example analysis, an Rxi™-5ms column separated 93 target analytes in US EPA Method 8270D in less than 18 minutes.
Optimizing Difficult Separations of Steroids Using an Allure™ Biphenyl HPLC Column: Steroids are structurally very similar, and separations on alkyl stationary phases can be difficult. Through a unique separation mechanism — π-π interactions between double bonds in the stationary phase and in the steroid molecules — an Allure™ Biphenyl column greatly enhances selectivity, and resolution. Two examples, sex hormones and corticosteroids, are shown here.
8-Minute GC Analysis of Residual Solvents: Single-injection, dual-column detection/confirmation assay is feasible for regulated solvents in pharmaceutical products, but no temperature program provides sufficient resolution on both columns. Using a Restek G43/G16 column pair and independent temperature programs in a Gerstel MACH column heating system, we analyzed and confirmed 23 Class 2 solvents in 8 minutes.
Simple, Optimized HPLC Analysis of Catecholamines: An Allure™ PFP Propyl column exhibits the retention needed to resolve these active, basic compounds, without derivatization or ion-pairing agents. Selectivity can be adjusted simply by changing the organic modifier in the mostly aqueous mobile phase.
80% Faster GC/MS Analysis of Essential Oils: A 10-meter, 0.10mm ID, 0.10µm film Rtx®-5 column reduces analysis time for bergamot oil or patchouli oil by 80%, for five-fold greater sample throughput and sharply reduced cost per analysis. Sample resolution is unchanged for bergamot oil and is slightly improved for patchouli oil.
Improve Characterization of Complex Protein Digests: A Viva C18 wide pore HPLC column resolves a tryptic digest of bovine serum albumin primarily into 1-2 peptide peaks, versus peaks of 3 or more peptides typically provided by conventional C18 columns. This superior resolution helps ensure more reliable identification of peptides in complex mixtures.
Parker ChromGas® Hydrogen Generators: Relative to helium as the GC carrier gas, hydrogen from a gas generator reduces gas costs, cuts analysis time by 50%, and reduces temperatures needed for eluting analytes — which increases column lifetime. Parker ChromGas® hydrogen generators are safe, convenient, reliable, and easy to use.
GC Inlet Liner Deactivations for Basic Drug Analysis: Basic drugs can interact with active sites on the surface of the inlet liner, reducing responses. The combination of a base-deactivated liner and a base-deactivated Rtx®-5Amine column ensures the greatest responses in analyses for these compounds.
How to Condition a New Capillary GC Column: Proper conditioning is essential for optimal performance from a capillary GC column, but inexperienced chromatographers might not know the proper procedures for installing and conditioning a new column. Here, we summarize our recommendations for installation and conditioning procedures.
Featured Restek Products
Analytical Reference Materials:
HPLC Accessories:
Sidewinder™ Heater/Cooler Temperature Control Module
GC Accessories:
Replacement Inlet Seals for Agilent 5890/6890 Split/Splitless Injection Ports
These publications are available in printed form or online, as downloadable pdf files.
