Overview
Chemical Solutions™ HSQ™ (High Sensitivity Qualification) and PQ™ (Performance Qualification) Kits are designed to support qualification of a wide range of liquid chromatography systems, including:
- UHPLC systems
- UPLC systems
- Conventional HPLC systems
Although UHPLC instruments operate at higher pressures and often utilize smaller particle columns for routine analyses, the core qualification measurements remain fundamentally the same. Detector performance, flow accuracy, injection precision, and gradient performance can all be evaluated using the qualification materials and procedures supplied with the kits.
Qualification Principles Are the Same
Instrument qualification is focused on verifying system performance rather than evaluating a specific analytical method.
Key performance tests include:
- Detector linearity
- Wavelength accuracy
- Injection precision
- Flow rate verification
- Gradient accuracy
- System reproducibility
These performance characteristics apply equally to UHPLC and conventional HPLC instruments.
Standard Qualification Column Compatibility
The column supplied with the qualification kit is suitable for use on UHPLC systems and does not require replacement with a sub-2 µm particle column.
Benefits of using the supplied qualification column include:
- Established qualification parameters
- Consistent performance criteria
- Simplified testing procedures
- Reduced method development requirements
The objective is to verify instrument performance rather than maximize chromatographic speed or efficiency.
Flow Rate Flexibility
The standard qualification procedures utilize a flow rate of approximately: 2.0 mL/min
Most UHPLC pumps are capable of operating at this flow rate without difficulty. If a different flow rate is preferred, qualification testing can still be performed by adjusting the expected chromatographic parameters accordingly.
Examples of parameters that may require modification include:
- Retention time windows
- Gradient timing profiles
- Acceptance criteria based on flow-dependent measurements
These adjustments allow the qualification process to be adapted to specific instrument configurations.
Retention Time Adjustments
When alternative flow rates are used, retention times will change proportionally.
For example:
- Lower flow rates typically result in longer retention times.
- Higher flow rates may reduce retention times.
Users should adjust retention time expectations within the qualification software or approved qualification procedures when operating outside the standard method conditions.
Gradient Qualification Considerations
Gradient testing remains fully applicable to UHPLC instruments.
If alternative flow rates are selected:
- Gradient time programs may need adjustment.
- Expected performance windows may need revision.
- Acceptance limits should be reviewed according to the operating conditions.
The underlying qualification principles remain unchanged.
Injection Volume Flexibility
Qualification procedures can accommodate different injection volume ranges.
Depending on the instrument and detector configuration, users may adjust injection volumes to:
- Optimize detector response
- Evaluate injector performance
- Match routine laboratory operating conditions
- Verify precision across the instrument's working range
The selected injection volume should remain within the validated operating capabilities of the instrument.
Custom Qualification Programs
Many laboratories choose to customize qualification conditions to align with their routine operating procedures.
Examples include:
- Alternative flow rates
- Different injection volumes
- Instrument-specific qualification templates
- Customized data processing methods
Qualification standards and solutions supplied with HSQ™ and PQ™ Kits can still serve as the foundation for these internally developed qualification programs.
Benefits for UHPLC Laboratories
Using HSQ™ and PQ™ Qualification Kits with UHPLC systems provides:
- Standardized qualification materials
- Consistent testing procedures
- Traceable performance measurements
- Reduced preparation effort
- Support for internal qualification programs
- Compatibility across multiple LC platforms
This allows organizations to maintain a consistent qualification strategy regardless of instrument type.
Key Takeaways
- HSQ™ and PQ™ Qualification Kits are compatible with UHPLC, UPLC, and HPLC systems.
- Qualification principles remain the same regardless of operating pressure.
- The supplied qualification column can be used on UHPLC instruments.
- Alternative flow rates may require adjustment of expected retention times and gradient profiles.
- Injection volumes can be tailored to instrument capabilities.
- The kits support both standard and customized qualification programs.
Additional Resources
For qualification standards, performance verification tools, application guidance, and product selection assistance, view: