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Detailed Introduction
The Bruker timsTOF Pro is a revolutionary high-resolution trapped ion mobility spectrometry-time of flight (TIMS-TOF) mass spectrometer that has redefined the standards for speed, sensitivity, and depth of analysis in proteomics and metabolomics. By integrating trapped ion mobility separation with a high-performance quadrupole-TOF mass analyzer, it adds a crucial fourth dimension—collision cross-section (CCS)—to traditional LC-MS analysis, enabling unprecedented separation of complex biological samples.
The core innovation of the timsTOF Pro lies in its Trapped Ion Mobility Spectrometry (TIMS) cell. Unlike traditional drift-tube ion mobility, the TIMS cell traps and accumulates ions using electric fields against a counter-flow gas, allowing for high-efficiency focusing and separation based on ion shape and size before releasing them to the TOF analyzer. This design is coupled with the proprietary Parallel Accumulation–Serial Fragmentation (PASEF) acquisition mode. In PASEF, the instrument continuously accumulates ions in the first TIMS section while sequentially releasing and fragmenting mobility-separated ions from the second section. This parallelization results in near-100% duty cycle and MS/MS acquisition speeds exceeding 100 Hz, eliminating the traditional trade-off between speed and sensitivity in shotgun proteomics.
The following table summarizes the critical technical parameters of the Bruker timsTOF Pro system, highlighting its capabilities in high-resolution mass analysis and ion mobility separation.
|
Parameter |
Specification |
|---|---|
|
Mass Analyzer |
High-resolution orthogonal acceleration Time-of-Flight (oa-TOF) |
|
Ion Mobility |
Dual TIMS (Trapped Ion Mobility Spectrometry) cell with PASEF technology |
|
Mass Resolution |
≥ 60,000 FWHM (at m/z 1222, in high-resolution mode) |
|
Mass Accuracy |
< 1 ppm RMS (internal calibration); typically ≤ 2 ppm (external calibration) |
|
MS/MS Speed |
Up to 200 Hz in PASEF mode (typically >100 Hz for routine operation) |
|
Mobility Resolution |
1/K0resolution ≥ 100 (capable of reaching 200+ under optimal conditions) |
|
CCS Precision |
< 0.5% relative standard deviation (RSD) for reproducible CCS measurements |
|
Mass Range |
m/z 20 – 40,000 (extended range for intact protein analysis) |
|
Sensitivity (MS) |
Signal-to-noise ratio > 650:1 (RMS) for 1 pg/μL reserpine (m/z 609) |
|
Polarity Switching |
Fast positive/negative switching capability |
|
Key Modes |
DDA-PASEF, DIA-PASEF (dia-PASEF), prm-PASEF (targeted), MRM-PASEF |
The timsTOF Pro excels in 4D-omics (retention time, ion mobility, m/z, intensity) applications. In proteomics, its high speed allows it to keep pace with fast nano-UHPLC gradients, routinely identifying over 6,000 proteins from a 100 ng HeLa digest in a one-hour run. The added CCS dimension provides an orthogonal filter that increases confidence in peptide identification and enables the separation of isomeric lipids and metabolites that are indistinguishable by mass alone. For biopharmaceutical characterization, the high mass range and mobility separation aid in the analysis of intact proteins and protein complexes. The system's robustness and high throughput also make it suitable for large-scale clinical cohort studies, where thousands of samples need to be processed with minimal instrument downtime.
In summary, the Bruker timsTOF Pro is not merely an incremental improvement but a platform that leverages the unique advantages of TIMS and PASEF to deliver a level of analytical depth and throughput that is particularly transformative for life science research and biomarker discovery.
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