Benchtop GC-TOFMS for Unbiased Compound Identification

Redefining GC-MS Performance

Unlock a new level of sensitivity in non-targeted analyses with the Pegasus BTX and BTX 4D systems. These advanced Gas Chromatography Time-of-Flight Mass Spectrometers (GC-TOFMS) deliver full mass-range acquisition, superior trace-level sensitivity, and automated deconvolution—giving you confident results even in your most complex samples. The Pegasus BTX offers femtogram-level detection and full-spectrum data capture for comprehensive, non-targeted analysis.

Tedious source cleaning is eliminated with the StayClean EI ion source, maximizing instrument uptime. The BTX achieves spectra acquisition rates up to 500 Hz, making it an ideal partner for the narrow peak widths achieved in GCxGC separations. BTX 4D systems pair the BTX with one of LECO’s advanced GCxGC modulators, enabling more thorough characterization of complex samples.

How the Pegasus BTX Works

The LECO Pegasus BTX is a gas chromatography–mass spectrometry (GC‑MS) system designed for the detection and identification of trace‑level organic compounds in complex samples. It is optimized for high sensitivity and robustness, making it well suited for routine and challenging applications such as environmental monitoring, petrochemical characterization, derivatized metabolites, and many more. The system is frequently paired with comprehensive two‑dimensional gas chromatography (GCxGC) to increase separation capacity for samples containing many co‑eluting components.

Samples are introduced into the system through a gas chromatograph, where volatile and semi‑volatile compounds are separated based on their interactions with the stationary phase of the GC column. In one‑dimensional GC operation, analytes elute sequentially from a single column. When configured for GCxGC, the system uses two columns of differing selectivity connected by a device called a modulator.

Following chromatographic separation, compounds enter the Pegasus BTX mass spectrometer ion source, where they are ionized by the StayClean electron ionization (EI) ionization source. The unique open-style geometry of the StayClean source prevents it from fouling due to matrix exposure – aside from periodic filament changes, most users never maintain or clean their ion source! The resulting ions are accelerated into a time‑of‑flight (TOF) mass analyzer with pulse transients up to 35 kHz. In the TOF analyzer, ions are separated according to their mass‑to‑charge ratio by measuring the time required for each ion to travel from the source to the detector.

Because the system collects full spectral data without mass filtering, both known and unknown compounds can be evaluated post‑analysis without re‑running samples.

Instrument Support

Ensure reliable instrument performance with extensive support, training, and maintenance services. Need tailored support for your mass spectrometers? Our experts are standing by.