The Cary Sipper—Pump and Measure Multiple Samples Simultaneously

Significance of the Topic

Automating sample introduction and cleaning in UV-Vis spectroscopy enhances laboratory throughput, reduces manual errors, and improves data reproducibility. The Cary Sipper accessory addresses these needs by enabling simultaneous handling of multiple samples within the Agilent Cary 3500 UV-Vis spectrophotometer.

Objectives and Study Overview

This study presents a technical overview of the Cary Sipper, evaluating its capability to pump and rinse up to three samples through dedicated flow cells. The goal is to compare manual cuvette handling against automated operation in terms of time savings and analytical consistency.

Methodology and Instrumentation

The accessory was tested on two configurations of the Agilent Cary 3500 UV-Vis instrument:

• Compact module: two-position cuvette holder, single flow cell operation.
• Multicell module: eight-position cuvette holder, up to three simultaneous flow cells.

Key components and settings:

• Cary Sipper three-channel peristaltic pump with interchangeable tubing: PVC for aqueous samples, PVC Solva for low-volatility organics, Marprene for ketone-based solvents.
• Quartz flow cells: 10 mm pathlength, 390 µL volume or 80 µL volume options, 15 mm Z-height to match standard cuvettes.
• Software controls via Cary UV Workstation: adjustable fill time, hold time for bubble settling, rinse time to prevent carry-over; temperature control of sample block.
• Measurement parameters: wavelength range 200–350 nm, 1 nm bandwidth, 0.1 s averaging, 1 nm interval.

Main Results and Discussion

Performance was assessed by measuring 30 identical samples using four operation modes:

1. Manual single cuvette on Compact module: 21 min 30 s.
2. Manual three cuvettes on Multicell module: 16 min 26 s (24 % reduction).
3. Sipper with one flow cell on Compact: 19 min 32 s (9 % reduction).
4. Sipper with three flow cells on Multicell: 7 min 30 s (65 % reduction).

The Sipper dramatically reduces total analysis time and ensures that multiple samples experience identical optical and temperature conditions.

Benefits and Practical Applications

Key advantages include:

• High throughput: concurrent analysis of up to three samples.
• Reduced manual labor and lower risk of handling errors or contamination.
• Flexible tubing and flow cell options for diverse solvent systems.
• Integration with software methods for consistent, reproducible workflows.

This accessory is especially valuable in QA/QC laboratories, kinetic studies, and any application demanding rapid UV-Vis screening.

Future Trends and Potential Applications

Emerging directions include integration with laboratory information management systems (LIMS) for fully automated sample tracking, coupling with temperature ramp protocols for thermodynamic studies, and expansion to higher-density flow cell arrays for ultra-high-throughput applications. Further development may focus on miniaturized flow paths and compatibility with advanced solvent gradients.

Conclusion

The Cary Sipper significantly streamlines UV-Vis workflows by automating sample delivery and cleaning, achieving up to 65 % time savings compared to manual operation. Its modular design and software integration make it a versatile tool for modern analytical laboratories.

References

No formal reference list was provided in the original document.