Technical Resources
Practical guidance for GC and LC column selection, operation and troubleshooting.
Chromatography column selection
Start with the separation technique, analyte chemistry, sample matrix and detector. Then compare stationary-phase selectivity and the dimensions required to balance resolution, speed, sample capacity and pressure.
GC stationary-phase selection
Phase selectivity is the central choice in GC. Consider analyte functional groups, boiling range, published application data and any method-prescribed phase. Similar polarity does not always mean equivalent selectivity.
GC column dimensions
Column length, internal diameter and film thickness jointly influence efficiency, retention, analysis time, pressure drop and loading. Method changes should be evaluated systematically rather than one variable at a time.
HPLC phase selection
For LC, choose the separation mode and phase chemistry based on analyte polarity, ionization and method conditions. Review particle size, pore size and pressure compatibility before changing dimensions.
Column installation
Use clean, compatible fittings, verify flow direction where specified, avoid overtightening, and introduce flow gradually. In GC, cut capillary ends squarely and leak-test the installation.
Conditioning
Condition according to the current manufacturer instructions and never exceed published temperature, pressure, pH or solvent-compatibility limits.
Storage
Store columns in a compatible solvent or condition specified by the manufacturer. Avoid leaving non-volatile buffers or salts in LC columns during extended storage.
High backpressure
Check system pressure without the column, inlet frit blockage, sample particulates, buffer precipitation, tubing restrictions and solvent viscosity.
Peak tailing / fronting
Investigate overload, active sites, unsuitable pH, poor fittings, dead volume, injection-solvent mismatch, contamination and column condition.
Retention-time drift
Review flow accuracy, temperature, mobile-phase composition, solvent evaporation, equilibration, carrier-gas control and column condition.
GC bleed / baseline noise
Confirm the column is within the published temperature range, check oxygen leaks, septa, inlet contamination, detector condition and recent conditioning history.
Cleaning and regeneration
Cleaning depends on column chemistry and the contaminant. Not all damaged columns can be regenerated; aggressive cleaning can permanently alter a phase.
Method transfer
When changing dimensions or particle size, consider linear velocity, flow, injection volume, gradient delay and system volume. For GC, account for length, ID, film thickness and carrier-gas conditions.
Column lifetime
There is no universal injection-count guarantee. Lifetime depends on matrix cleanliness, operating limits, sample load, contamination, leaks, temperature exposure, mobile phases and maintenance.
Frequently asked questions
Quick answers about this page, product selection and Indian enquiry support.
How should a new GC column be installed?
Use clean compatible fittings, make a clean column cut, follow instrument insertion-depth guidance, leak-test connections and condition within the column manufacturer’s specified limits.
How should an HPLC column be conditioned?
Install with compatible fittings, introduce flow gradually and equilibrate with a suitable mobile phase until pressure and detector response are stable.
What causes high backpressure in HPLC?
Common causes include particulate blockage, precipitated buffer, contaminated frits, viscous mobile phases or restrictions elsewhere in the LC system.
What can cause GC column bleed?
Bleed can increase with excessive temperature, oxygen exposure, contamination or unsuitable conditioning. Always stay within the published column limits.
What causes peak tailing?
Possible causes include active sites, contamination, overload, poor connections, unsuitable chemistry or method conditions. Diagnose the system and column systematically.
Can a chromatography column always be regenerated?
No. Recovery depends on the type and severity of contamination and whether the stationary phase or column bed has been permanently damaged.