Waters Xevo G2 QTof Mass Spectrometer

Overview

The Waters Xevo G2 QTof is a high-performance, benchtop quadrupole time-of-flight (Q-TOF) mass spectrometer engineered for precision in both quantitative and qualitative analysis of complex chemical and biological samples. Leveraging orthogonal acceleration time-of-flight (oa-TOF) technology — refined through Waters’ proprietary QuanTof™ architecture — the system delivers exceptional mass accuracy ( 25,000 FWHM at m/z 556), and robust sensitivity across dynamic concentration ranges. Designed for integration with ultra-performance liquid chromatography (UPLC®), the Xevo G2 QTof operates on a dual-stage mass filtering principle: the front-end quadrupole enables precursor ion selection or transmission, while the oa-TOF analyzer provides high-fidelity, high-speed full-spectrum acquisition with sub-millisecond duty cycle. This architecture supports both targeted quantitation (via reference standards and isotopic labeling) and untargeted discovery workflows — making it suitable for metabolomics, proteomics, impurity profiling, degradation product identification, and regulatory-compliant method development in pharmaceutical, academic, and contract research laboratories.

Key Features

• QuanTof™ Technology: Integrates a high-field pusher, dual-ion reflectron optics, and an advanced microchannel plate (MCP) detector within an optimized TOF flight tube geometry to maximize signal-to-noise ratio, mass accuracy, and spectral reproducibility.
• UPLC®/MSE Data Acquisition: Enables simultaneous detection of precursor and fragment ions in a single, non-scanning acquisition mode — eliminating the need for prior knowledge of analytes and supporting retrospective data mining without re-injection.
• Engineered Simplicity™ Design: Streamlines hardware configuration, calibration routines, and maintenance cycles through intuitive vacuum interlocks, automated tuning protocols, and modular source exchange — reducing operator dependency and increasing instrument uptime.
• Ion Mobility Compatibility Ready: While the Xevo G2 QTof itself does not include ion mobility separation (IMS), its ion optical design and data system architecture are fully compatible with subsequent IMS integration (e.g., via Waters SELECT SERIES Cyclic IMS or SYNAPT platforms).
• Robust Electrospray Ionization (ESI) and Atmospheric Pressure Chemical Ionization (APCI) Sources: Field-replaceable, temperature-controlled interfaces support broad polarity coverage and stable ion generation across volatile and thermally labile compounds.

Sample Compatibility & Compliance

The Xevo G2 QTof accommodates diverse sample types including small molecules (pharmaceutical actives, environmental contaminants), peptides, oligonucleotides, and polar metabolites — provided they are soluble and amenable to LC-based introduction. It complies with key regulatory frameworks governing analytical instrumentation in regulated environments: data integrity is supported via optional Waters Empower™ 3 Software with 21 CFR Part 11 compliance modules (electronic signatures, audit trail, user access control); routine performance verification follows ASTM E2964-14 (mass accuracy) and ISO/IEC 17025 guidelines for calibration traceability. The system meets GLP/GMP documentation requirements when deployed with validated methods and controlled change management procedures.

Software & Data Management

Controlled by Waters MassLynx™ NT software, the Xevo G2 QTof offers real-time spectrum visualization, automated centroiding, lock-mass correction, and customizable processing templates. Raw data files (.raw) are natively compatible with third-party open-format tools (e.g., ProteoWizard, OpenMS) and vendor-neutral repositories such as MetaboLights or PRIDE. For quantitative workflows, TargetLynx™ AX application provides peak integration, calibration curve fitting, and statistical reporting aligned with ICH Q2(R2) validation principles. All software modules support metadata tagging, project-based data organization, and export to CSV, XML, or mzML formats for long-term archival and cross-platform interoperability.

Applications

• Identification and structural elucidation of unknown degradants and impurities in drug substance and product stability studies
• Comprehensive metabolite profiling in preclinical and clinical biofluids (plasma, urine, CSF)
• Peptide mapping and post-translational modification (PTM) analysis in biopharmaceutical characterization
• Residue screening in food safety and environmental monitoring (pesticides, mycotoxins, PFAS)
• High-confidence compound annotation in untargeted omics experiments using accurate mass databases (HMDB, LipidMaps, GNPS)

FAQ

What is the typical mass accuracy achievable with the Xevo G2 QTof under routine operating conditions?
Mass accuracy of ≤ 1 ppm RMS is routinely achieved using internal lock-mass correction with leucine enkephalin or sodium formate calibrants.
Can the Xevo G2 QTof be used for regulated quantitative bioanalysis (e.g., FDA submissions)?
Yes — when configured with Empower 3 (21 CFR Part 11 compliant), validated methods, and documented system suitability testing per USP and ICH M10 guidelines.
Is collision-induced dissociation (CID) energy programmable on this platform?
Yes — the quadrupole collision cell supports stepped or ramped collision energy profiles for controlled fragmentation in MS/MS and MSE modes.
Does the system support high-throughput screening applications?
With UPLC coupling and fast polarity switching ( 1,000 injections per week in automated batch runs.
What level of technical support and service coverage is available globally?
Waters-certified field service engineers provide preventive maintenance, remote diagnostics, and application-specific training through regional service centers aligned with ISO 9001-certified quality systems.