Isotope ratio analysis requires dedicated instrumentation, script-based data processing across multiple tools, and workflows that routinely take days, placing it out of reach for most research laboratories. Thermo Fisher Scientific has introduced the Thermo Scientific Orbitrap Isora MS and Orbitrap Isora Pro MS, its first Orbitrap instruments with a dedicated isotope ratio analysis mode, paired with the Vanquish Duo UHPLC System and Isotope Discoverer Software. The integrated workflow reduces isotope ratio analysis from days to hours and brings stable isotope analysis to laboratories without specialist IRMS infrastructure.
What the Orbitrap Isora MS Addresses in Stable Isotope Analysis Workflows
The Orbitrap Isora MS measures isotopologues and isotope ratios directly from intact molecular ions, using electrospray ionization (ESI) and high-resolution accurate-mass (HRAM) detection. This approach bypasses the need to convert samples to a simple gas first, so the structural identity of the analyte survives measurement. A single acquisition captures multiple isotopes, including carbon, nitrogen, oxygen, hydrogen, and sulfur; position-specific isotope ratios and clumped isotope measurements are available in the same run.
Working in analytical science?
Register for a FREE Separation Science account to subscribe to the Separation Science Newsletter.
Conventional isotope ratio mass spectrometry (IRMS) relies on dedicated instrumentation and script-based data processing spread across multiple tools, and results can take days to produce. The Orbitrap Isora addresses both constraints: the Vanquish Duo UHPLC System automates sample and reference bracketing with known standards, while Isotope Discoverer Software handles ratio extraction, data correction, calibration, and reporting in one environment.
"Isotope ratio analysis can answer questions few other techniques can address," remarks Dieter Hofmann, vice president and general manager of Chromatography and Mass Spectrometry at Thermo Fisher Scientific. "By bringing these capabilities to a familiar Orbitrap platform and simplifying what has traditionally been a highly specialized workflow, we can put powerful isotope insights in the hands of more scientists and help accelerate discoveries across human health, the environment and our planet."
The technique landscape the Orbitrap Isora enters spans isotope ratio mass spectrometry in nuclear and environmental chemistry through to stable isotope analysis in food and beverage samples. On the regulatory side, US Environmental Protection Agency (EPA) Methods 533 and 537.1 set the LC-MS/MS framework for per- and polyfluoroalkyl substances (PFAS) monitoring in drinking water, one of the primary target application areas for the Orbitrap Isora.
Where the Orbitrap Isora MS Fits Current Analytical Workflows
The Orbitrap Isora workflow targets four application areas where compound origin and transformation history are analytically relevant:
- Environmental source tracing: PFAS and other persistent organic contaminants raise questions that elemental analysis and conventional IRMS cannot answer at the molecular level. Molecular isotope signatures differ by contaminant source and transformation pathway, letting analysts distinguish a manufacturing discharge from agricultural runoff even when the compound is chemically identical; remediation teams can then focus resources on the actual source rather than the extent of contamination.
- Geoscience, climatology, and archaeology: Compound-specific stable isotope ratios connect isotopic signatures to individual organic molecules preserved in sediment, rock, or biological material. Past oxygen levels, microbial activity, and climate episodes recorded in geological strata all depend on information that gas-IRMS loses during combustion.
- Bioscience and metabolism: Labelled nutrients traced through intact metabolites in human or animal studies reveal how the body processes specific compounds at the molecular level, opening research avenues in nutrition, metabolic disease, and drug development.
- Food and beverage authenticity: Molecular-level isotope signatures reflect production process, botanical origin, and geographic provenance in ways that bulk isotope ratios cannot resolve, supporting adulteration detection and origin verification.
Douglas Morrison, Professor of Isotope Bioscience at SUERC – Centre for the Isotope Sciences, University of Glasgow, notes: "The Orbitrap Isora MS enables new workflows that are very exciting, providing expanding ways to examine everything from human, animal and plant health to the biochemical history of molecule formation. By opening new avenues of scientific discovery, the Orbitrap Isora MS could help researchers address fundamental challenges shaping a sustainable future on Planet Earth."
How Do the Orbitrap Isora MS and Orbitrap Isora Pro MS Differ?
The primary difference between the Orbitrap Isora MS and Orbitrap Isora Pro MS is maximum resolving power. They share the same ionization source and fragmentation mode.
| Orbitrap Isora MS | Orbitrap Isora Pro MS | |
|---|---|---|
| Max. Resolution | Up to 240,000 at m/z 200 | Up to 480,000 at m/z 200 |
| Fragmentation | Higher Collisional Dissociation (HCD) | Higher Collisional Dissociation (HCD) |
| Mass Accuracy (External Cal.) | Under 3 ppm RMS | — |
| Mass Accuracy (Internal Cal.) | Under 1 ppm RMS | — |
Mass accuracy specifications are confirmed for the Orbitrap Isora MS via the product page. Published specifications for the Orbitrap Isora Pro MS were not available at time of writing; the fragmentation mode reflects Thermo Fisher's Orbitrap platform standard.
Where to Find the Orbitrap Isora MS
The Orbitrap Isora MS and Orbitrap Isora Pro MS are now commercially available. Both instruments represent the first time Orbitrap technology has included a dedicated isotope ratio mode, extending a well-established HRAM platform into compound-specific stable isotope analysis.
This article is based on a press release issued by Thermo Fisher Scientific and was produced under Separation Science's AI Editorial Guidelines.
