Shim-pack MC PLONAS C18 - INSTRUCTION MANUAL

Importance of the Topic

Reversed-phase micro-flow HPLC using superficially porous particles (SPP) offers enhanced separation efficiency, reduced analysis times, and lower solvent consumption. These attributes are critical for modern analytical laboratories seeking high throughput, sensitivity, and robust performance across diverse applications in pharmaceuticals, environmental testing, and proteomics.

Objectives and Overview

This document introduces Shimadzu’s MC PLONAS C18 column, a micro-flow HPLC packing based on 2.7 µm SPPs with a 0.5 µm porous shell. It outlines column characteristics, operational guidelines, maintenance procedures, and best practices for both standard and low-volume applications.

Methodology and Instrumentation

The stationary phase consists of end-capped dimethyloctadecyl groups bound to high-purity silica cores. Key specifications include:

• Particle size: 2.7 µm (SPP)
• Surface area: ~135 m²/g
• Pore size: 90 Å
• Recommended pH range: 2–9
• Maximum temperature: ≤ 60 °C
• Pressure tolerance: up to 400 bar (nano-capillary formats: 200–500 µm ID)

Instrumental requirements emphasize low-volume flow paths: nanoliter-scale spray tips or UV cells, minimal dead volume tubing (≤ 50 µm ID), fast detector response, and sample traps for LC-MS applications.

Main Results and Discussion

Shim-pack MC PLONAS C18 demonstrates high column efficiency due to shallow diffusion paths in the porous shell. Compared to fully porous particles, similar retention is achieved with lower backpressure and faster separations. Gradient elution from 5–100% organic modifier enables rapid resolution of complex mixtures. Buffered mobile phases (20–50 mM, pH 2–3) enhance reproducibility for ionizable analytes.

Benefits and Practical Applications

• High efficiency separations with reduced analysis time
• Compatibility with both acetonitrile/water and methanol/water systems
• Robust performance over a wide pH range (2–9)
• Low solvent consumption for cost savings
• Adaptability to nano- and capillary-LC-MS workflows

Future Trends and Opportunities

Further developments may include thinner porous shells for even higher speed separations, novel stationary phases with tailored chemistries for challenging analytes, and tighter integration with microfluidic systems. Ongoing advances in detector sensitivity and system miniaturization will expand applications in single-cell proteomics, metabolomics, and field-deployable monitoring.

Conclusion

Shimadzu’s MC PLONAS C18 micro-flow HPLC column provides an effective combination of high efficiency, robust chemistry, and operational flexibility. Proper implementation of flow path minimization, buffer selection, and maintenance protocols ensures reliable performance and long column lifetime.

Instrument Used

• Shimadzu MC PLONAS C18 micro-flow columns
• HPLC system with nano-capillary fittings
• Low-volume UV or MS detectors
• In-line 0.5 µm filters and zero-dead-volume connectors

References

No external literature cited; specifications and guidelines extracted from Shimadzu instruction manual ERAD-0001-9055.