Compact Ultrahigh-Pressure Nanoflow Capillary Liquid Chromatograph

Area of Science:

• Analytical Chemistry
• Instrumentation Science

Background:

• Traditional liquid chromatography (LC) systems can be bulky and difficult to move.
• There is a need for portable analytical instruments for on-site or flexible laboratory use.
• Coupling LC with mass spectrometry (MS) requires robust and low-volume interfaces.

Purpose of the Study:

• To develop a compact, portable ultrahigh-pressure nanoflow liquid chromatograph (LC) system.
• To enable easy relocation and direct coupling with mass spectrometry (MS).
• To achieve high-pressure operation and efficient sample analysis.

Main Methods:

• Development of a compact LC system with integrated nanoflow pumps, low-volume injector, and mixing tee.
• Operation at pressures up to 1100 bar (16000 psi) with a total pump capacity of 60 μL.
• Evaluation of gradient performance, reproducibility using polycyclic aromatic hydrocarbons, and LC-MS coupling with a trypsin-digested bovine serum albumin sample.

Main Results:

• The developed LC system is lightweight (4.5-5.9 kg) and capable of ultrahigh pressures.
• Excellent day-to-day gradient accuracy (RSD 0.6%) and retention-time reproducibility (RSD < 0.17%) were achieved.
• Successful LC-MS coupling demonstrated narrow peaks, short dwell times, and good peptide coverage.

Conclusions:

• The compact ultrahigh-pressure nanoflow LC system is suitable for portable applications and direct MS coupling.
• The system offers high performance in terms of pressure, reproducibility, and analysis time.
• This portable LC-MS solution facilitates efficient analysis of complex biological samples.