PAL RSI and PAL RTC Sample Prep and Injection

Significance of Topic

Automated sample preparation is critical to modern analytical workflows, as it addresses the two largest bottlenecks in chromatographic and mass spectrometric analyses: time consumption (over 60% spent on prep) and error rates (approximately 30% of errors originate from manual handling). High-throughput labs in pharmaceutical, environmental, clinical and food testing sectors demand solutions that improve reproducibility, safety and productivity.

Study Objectives

This whitepaper presents the design and capabilities of the PAL System’s latest generation platforms—PAL RTC (Robotic Tool Change) and PAL RSI (Robust Sample Injector). The goals are to demonstrate how modular robotics, tool interchange and intelligent software can automate diverse workflows (liquid injection, headspace, SPME, SPE, dilutions, derivatizations) for 24/7 operation with traceable, high-precision results.

Methodology and Used Instrumentation

The core instruments include:

• PAL RTC with Park Station enabling automatic exchange of up to three tools for multistep sample prep.
• PAL RSI as a compact workhorse variant for robust single-tool automation.
• PAL DHR Dual Head configuration for parallel or independent workflows.
• A comprehensive toolbox of tools and modules: syringes (1.2 µL to 10 mL), headspace and SPME/Arrow devices, ITEX DHS trap, pipetting and dilutor tools, agitator, vortex mixer, valve drive, Peltier stacks and wash modules.
• Control software: PAL Sample Control for sequence scheduling and overlapping operations, and PAL Method Composer for drag-and-drop method design.

Main Results and Discussion

Benchmarked performance shows:

• Liquid injection repeatability better than 0.1% RSD (20 µL loop) and linearity R²>0.9999.
• Headspace and SPME extractions with RSD<1% and low carryover.
• Fast splitless GC injections down to 100 ms with minimal discrimination (C40/C20>0.98).
• Temperature-controlled sample storage handling up to 9 216 samples at 4–40 °C.
• Dual-head configurations doubling throughput by parallelizing sample intake and analysis.

Benefits and Practical Applications

Key advantages include:

• Continuous 24/7 operation with full traceability and position sensing to prevent errors.
• Customization for workflows: protein precipitation, Bligh and Dyer extraction, headspace monitoring, liquid–liquid and solid-phase extractions.
• Seamless integration with major CDS/MS systems (Agilent, Thermo, Sciex, Waters, etc.).
• Enhanced lab safety by reducing human exposure to hazardous reagents and repetitive strain tasks.

Future Trends and Opportunities

Emerging directions involve coupling smart sample prep with real-time analytics, AI-driven method optimization, miniaturized consumables for green chemistry, and cloud-based networked automation for decentralized labs. Integration with high-resolution MS and online SPE-LC systems will further expand application fields.

Conclusion

The PAL RTC and RSI platforms represent a versatile, scalable solution that elevates sample preparation from manual, error-prone steps to highly automated, reliable workflows. By combining modular robotics, precision tools and intelligent scheduling software, laboratories can maximize throughput, improve data quality and adhere to strict QA/QC requirements.

References

• Agilent Technologies. SAMPLE PREPARATION FUNDAMENTALS FOR CHROMATOGRAPHY.