A specialized method for high sensitivity with the Whisper Zoom 20 samples per day method

Importance of the Topic

The development of high-throughput, high-sensitivity proteomics workflows is critical for advancing biological discovery and clinical research. The Whisper Zoom 20 SPD method delivers a robust 20 samples per day platform, combining rapid chromatography with low nanoflow rates to maximize peptide detection and reproducibility.

Objectives and Study Overview

This work evaluates the performance of the Whisper Zoom 20 SPD method on an Evosep One system, comparing two chromatographic columns (EV1112 Performance and Aurora Elite 15×75) for peptide separation. Key aims included:

• Optimizing gradient times and flow rates for rapid analysis.
• Assessing sensitivity and reproducibility using a 5 ng HeLa tryptic digest.
• Demonstrating interoperability across Bruker and Thermo mass spectrometers.

Methodology and Instrumentation

The Whisper Zoom 20 SPD method uses a 68 min gradient and 72 min cycle time. Initial equilibration at 450 nl/min is followed by a working gradient at 200 nl/min, ramping to 450 nl/min for column washing. Two column options are detailed:

• EV1112 Performance column at 40 °C with the corresponding 10 µm emitter.
• Aurora Elite 15×75 column (IonOpticks) at 50 °C for Bruker or Thermo systems.

Mass spectrometers employed include Bruker timsTOF Pro 2 and Thermo platforms, with data processed via Compass Data Analysis. Emitter installation and Evosep One configuration follow a stepwise script to ensure correct transfer line and flow sensor connections.

Main Results and Discussion

Chromatographic pressure profiling showed stable pump operation up to 450 bar. Total ion current (TIC) and base peak chromatograms (BPC) from 5 ng HeLa digest injections demonstrated sharp, well-resolved peaks on both columns. Extracted ion chromatograms for four diagnostic peptides revealed full-width at half-maximum (FWHM) values of ~4–7 s on the Aurora Elite and ~6–12 s on EV1112, indicating high peak capacity and sensitivity. Retention time reproducibility across ten injections exhibited variations below 0.2 min, confirming method robustness.

Benefits and Practical Applications

The Whisper Zoom 20 SPD workflow offers:

• High sample throughput (20 per day) without sacrificing chromatographic resolution.
• Low sample consumption (5 ng digests), suitable for limited or precious samples.
• Cross-platform compatibility for diverse laboratory setups.

These features make the method attractive for proteomics labs focused on biomarker discovery, quality control in biopharmaceutical development, and large-scale clinical studies.

Future Trends and Potential Uses

Continued advances in column chemistries and emitter designs are expected to further reduce cycle times and improve sensitivity. Integration with data-independent acquisition (DIA) workflows and real-time data analysis will enhance throughput and quantitative accuracy. The approach may also extend to post-translational modification mapping and targeted assays in clinical proteomics.

Conclusion

The Whisper Zoom 20 SPD method on Evosep One demonstrates a compelling balance of speed, sensitivity, and reproducibility. By leveraging optimized gradients, low flow rates, and adaptable column choices, laboratories can achieve consistent high-quality proteomic data at scale.

Reference

AN-037A 24/06