Sub-2 µM Particle Column
Definition
A UHPLC column packed with 1.6 to 1.8 µm silica particles instead of the conventional 5 µm. Smaller particles give sharper peaks and faster runs but generate much higher back-pressure (600 to 1500 bar), which is why UHPLC pumps and tubing are built differently from classical HPLC hardware.
- Particle size
- 1.6 to 1.8 micrometres
- Conventional comparison
- 5 micrometre HPLC particles
- Back-pressure range
- 600 to 1500 bar
- Benefit
- Sharper peaks, faster runs
- Platform
- UHPLC only, not standard HPLC
Common questions
Why can't a sub-2 micrometre column be run on a standard HPLC system?+
Standard HPLC pumps, tubing, and injectors are rated well below the pressures these columns generate. Forcing that pressure through conventional hardware risks leaks, seal failure, or pump damage, which is why UHPLC instruments use reinforced components built for the higher operating range.
What is actually gained in a forensic workflow by using one?+
Narrower peaks improve resolution between closely related compounds, such as isomers in a drug or metabolite panel, and shorter run times raise laboratory throughput. Both matter in casework where sample backlogs and peak overlap can affect confidence in an identification.
Related terms
- Densitometric Scanning
- The HPTLC quantitation step. After the developed plate dries, a Camag TLC Scanner 4 sweeps a narrow slit of UV or visible...
- Diode Array Detector (DAD)
- A UV-Vis detector that records the full 190 to 800 nm absorbance spectrum of every peak as it elutes, instead of a...
- Isocratic vs Gradient Elution
- Isocratic means the mobile-phase composition stays constant through the run; simple, reproducible, but limited resolving power for wide-polarity mixtures. Gradient means the...
- Method Validation Parameters
- The numbers a forensic method must hit before it is considered fit for routine use: linearity R² > 0.999 over the working...
- Reverse-Phase Chromatography
- Liquid chromatography with a non-polar stationary phase (most commonly octadecyl-bonded silica, called C18) and a polar mobile phase (water mixed with methanol...