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The right Liquid Handling technology for Analytical Chromatography

Analytical chromatography has specific requirements when it comes to liquid handling. While in Life Science, handling aqueous samples with standard air displacement pipettes is generally straightforward, in Analytical Chromatography (GC, GC-MS, LC, LC-MS), the rules change entirely. When working with volatile organic solvents such as acetonitrile, methanol, or hexane, the traditional air cushion technology used in air displacement pipettes faces physical limitations that can compromise data quality.

This is where choosing the right liquid handling technology becomes essential for achieving reliable, accurate, and reproducible analytical results.

THE HIDDEN PITFALLS OF AIR DISPLACEMENT

Standard air-cushion pipetting introduces critical risks in chromatographic workflows:

Pipette Dripping: High vapor pressure causes organic solvents to evaporate into the air cushion, potentially leading to liquid dripping and volume loss.
Constant Recalibration: Switching solvents with different viscosities or densities forces time-consuming recalibration steps.
Ghost Peaks & Contamination: Aggressive solvents leach contaminants out of plastic disposable tips, creating artifacts in MS runs.
Sample Evaporation: Open-vessel pipetting exposes volatile analytes to air, altering sample concentration.

THE SMART SOLUTION: POSITIVE DISPLACEMENT

Analytical precision requires replacing the compressible air cushion with a direct mechanical piston. This approach solves critical analytical challenges through three core advantages:

1 Single Calibration
Positive displacement systems maintain volumetric accuracy across diverse solvents without requiring method-specific recalibrations.
100% Sealed-Vial Sampling
Piercing steel needles keep sample vials sealed during aspiration, preventing solvent evaporation.
0 Polypropylene Contaminants
Glass microsyringes and steel needles eliminate plastic-leached artifacts and ghost peaks in sensitive LC-MS/GC-MS runs.

Furthermore, by removing air-cushion dependence, positive displacement delivers key operational benefits:

Handles Complex Matrices: Easily handles high-viscosity samples (oils, resins) by minimizing dependence on air compressibility and reducing the likelihood of aerosol formation.
Material Flexibility: High flexibility in material selection lets you switch from glass to polymeric syringes (PE/PP) to prevent analyte adsorption in sensitive workflows like PFAS analysis.
Uncompromised Precision: Guarantees repeatable volume delivery regardless of solvent volatility.

THE TAKEAWAY

Protect your analytical data by eliminating air-cushion variability. Upgrading to positive displacement technology ensures total volume confidence, cleaner spectra, and reproducible results across all sample matrices. 

→ Request the White Paper
“Why Chromatography Demands Positive Displacement Liquid Handling” to learn more.

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