A specialized method for high sensitivity with the Whisper Zoom 40 samples per day method

Importance of the Topic

The continuous demand for rapid, sensitive analysis of proteomic samples drives the development of optimized chromatography–mass spectrometry workflows. The Whisper Zoom 40 samples per day (SPD) method addresses these requirements by combining high chromatographic resolution, low sample consumption, and a short cycle time for routine high‐throughput applications.

Objectives and Overview of the Study

This application note evaluates the performance of the Whisper Zoom 40 SPD method on the Evosep One platform. Key objectives include assessing gradient efficiency, peptide detection sensitivity, chromatographic reproducibility, and multi‐vendor compatibility across different column and emitter combinations.

Methodology

The method employs a 32.5 min analytical gradient at 200 nL/min, followed by a 3.5 min wash step at 450 nL/min, yielding a total cycle time of 36 min. Two column configurations were tested:

• EV1112 Performance column (Evosep) at 40 °C with a captive spray emitter
• Aurora Elite 15×75 µm column (IonOpticks) at 50 °C on Bruker or Thermo mass spectrometers

Chromatographic performance was characterized using a 5 ng HeLa tryptic digest. Total ion current (TIC) and base peak chromatograms (BPC) were recorded, and four diagnostic peptides were extracted to evaluate peak shape and retention time stability.

Used Instrumentation

• Evosep One liquid chromatography system
• timsTOF Pro 2 mass spectrometer (Bruker)
• Compass Data Analysis software (Bruker)
• EV1112 Performance column (Evosep)
• Aurora Elite 15×75 µm column (IonOpticks)
• Captive Spray 2 emitter (10 µm ID) for Bruker platforms
• Fused silica emitter (10 µm ID) EV1111 for Thermo systems

Main Results and Discussion

The method delivered consistent TIC and BPC profiles with both column setups. Extracted ion chromatograms showed full widths at half maximum (FWHM) between 2.4 s and 5.2 s, indicating sharp, well‐resolved peaks. Retention times across sequential injections varied by less than 0.1 min, demonstrating excellent reproducibility essential for quantitative workflows.

Benefits and Practical Applications of the Method

• High throughput: enables up to 40 runs per day with a 36 min cycle
• Low sample consumption: sensitive detection with 5 ng peptide load
• Superior resolution: narrow peak widths enhance quantitation accuracy
• Cross‐platform flexibility: compatible with Bruker and Thermo mass spectrometers
• Automated operation: streamlined setup supports routine proteomic assays

Future Trends and Potential Applications

The Whisper Zoom 40 SPD workflow is poised for integration into multiplexed quantitative proteomics and single‐cell analysis. Future enhancements may include even shorter gradients, integration of ion mobility separations, and real‐time data processing to facilitate adaptive acquisition strategies in high‐throughput screening.

Conclusion

The Whisper Zoom 40 SPD method offers an optimized balance of speed, sensitivity, and reproducibility for modern proteomic laboratories. Its versatile configuration options and robust performance make it an ideal choice for both research and industrial quality‐control settings.