Agilent 6545 Q-TOF LC/MS System
| Brand | Agilent Technologies |
|---|---|
| Origin | Singapore |
| Manufacturer Type | Original Equipment Manufacturer (OEM) |
| Origin Category | Imported |
| Model | 6545 |
| Instrument Type | Quadrupole-Time-of-Flight (Q-TOF) |
Overview
The Agilent 6545 Q-TOF LC/MS System is a high-resolution, accurate-mass liquid chromatography mass spectrometry platform engineered for demanding qualitative and quantitative applications in regulated and discovery-driven laboratories. Based on orthogonal acceleration time-of-flight (oa-TOF) mass analysis coupled with a robust quadrupole front-end, the system delivers sub-ppm mass accuracy, high sensitivity across a wide dynamic range, and exceptional spectral reproducibility—enabling confident compound identification, structural elucidation, and trace-level quantitation in complex matrices. Its architecture supports both data-dependent acquisition (DDA) and data-independent acquisition (DIA) modes—including full-scan MS/MS—making it suitable for untargeted screening, targeted confirmation, and semi-targeted workflows without hardware reconfiguration.
Key Features
- Next-generation microchannel plate (MCP) detector with extended lifetime, maintained high sensitivity (>1000:1 S/N at 200 fg on-column), and linear dynamic range exceeding 5 orders of magnitude
- Enhanced TOF electronics with active temperature stabilization and real-time flight path calibration, ensuring long-term mass stability (<1 ppm RMS drift over 24 h)
- High-energy collision cell with optimized ion optics for consistent, reproducible fragmentation across m/z 50–3000
- Integrated Jet Stream electrospray ionization (ESI) source with dual orthogonal sprayer design for improved ion transmission efficiency and reduced matrix suppression
- MassHunter Software Suite v10.x or later, supporting FDA 21 CFR Part 11-compliant audit trails, electronic signatures, and secure user access controls
- PCDL (Personal Compound Database and Library) integration for automated MS/MS spectral matching, retention time alignment, and co-elution scoring during retrospective data mining
Sample Compatibility & Compliance
The 6545 Q-TOF is validated for use with biological fluids (plasma, urine, tissue extracts), food homogenates, environmental water/soil extracts, forensic specimens, and purified biopharmaceutical samples. It meets instrumental performance criteria outlined in ASTM E2918 (standard guide for LC/MS method validation), ISO/IEC 17025:2017 (general requirements for competence of testing and calibration laboratories), and USP <1225> (validation of compendial procedures). For regulated environments, the system supports GLP/GMP-aligned workflows including instrument qualification (IQ/OQ/PQ), method validation documentation templates, and raw data integrity per ALCOA+ principles.
Software & Data Management
MassHunter Qualitative Analysis enables automated peak detection, formula generation, fragment ion annotation, and library matching against NIST, METLIN, LipidBlast, and custom PCDL libraries. MassHunter Quantitative Analysis provides streamlined batch processing for multi-analyte pesticide residue analysis—users define calibration curves once, then apply them across hundreds of compounds with auto-integration, internal standard correction, and MRL-based reporting flags. VistaFlux workflow (optional module) delivers end-to-end isotopic tracing analysis: from centroided isotopologue extraction to pathway mapping of 13C-labeled metabolites in cancer cell models, with built-in normalization, statistical filtering, and visualization of carbon atom transitions through TCA cycle intermediates.
Applications
- Food Safety & Environmental Monitoring: Simultaneous detection and confirmation of >300 pesticides, veterinary drugs, and mycotoxins at or below EU MRLs in milk, cereals, and produce using full-scan MS/MS and co-elution scoring
- Lipidomics: Identification and relative quantification of >1500 lipid species—including sphingolipids, phospholipids, glycerolipids, sterols, and fatty acids—in human serum and plant tissues via class-specific fragmentation rules and retention time prediction
- Metabolomics & Metabolic Flux Analysis: Stable-isotope resolved metabolomics (SIRM) with U-13C-glutamine tracing in adherent tumor cell lines, generating flux maps of oxidative vs. reductive TCA cycling and glutaminolysis
- Biopharmaceutical Characterization: Intact mAb analysis (0.5 µg injection), peptide mapping of NIST mAb under 15-min gradients, and post-translational modification localization (e.g., methionine oxidation at position 4 of light chain) using b/y-ion series annotation and mass delta analysis
FAQ
What is the typical mass accuracy performance of the 6545 Q-TOF under routine operation?
Typical internal calibration mass accuracy is ≤0.5 ppm RMS over 24 hours; external calibration achieves ≤1.0 ppm RMS across m/z 100–2000 with lock mass correction.
Does the system support regulatory compliance for pharmaceutical QC labs?
Yes—it supports 21 CFR Part 11 compliance via MassHunter’s secure audit trail, role-based permissions, and electronic signature functionality when deployed with validated IT infrastructure.
Can the 6545 perform both DDA and DIA acquisition in a single run?
No—acquisition mode is configured per method, but switching between DDA and DIA requires only software reconfiguration; no hardware modification is needed.
Is the Jet Stream ESI source compatible with UHPLC backpressures up to 1300 bar?
The source is rated for continuous operation at ≤1200 bar; optimal sensitivity is achieved at 600–900 bar with standard 2.1 mm i.d. columns.
How does the PCDL knowledge base improve retrospective analysis?
PCDL stores compound-specific MS/MS spectra, retention times, and diagnostic fragments—enabling re-interrogation of archived full-scan datasets without re-running samples, significantly accelerating non-targeted screening follow-up.
