Cerno Bioscience, in cooperation with Sabic Innovative Plastics, has succeeded in demonstrating the ability to perform formula ID on a Thermo Scientific LCQ Deca Max ion trap mass spectrometer
Using MassWorks sClips (self calibrated lineshape isotope profile search), the latest addition to the MassWorks mass spectrometry software suite, the researcher, Christian Wold, was able to identify a set of trial compounds to within a top few compounds from a list of hundreds of formula candidates.
MassWorks was originally launched in 2006, and received the prestigious Editors' Choice Bronze award at Pittcon 2006.
MassWorks is an easy-to-use post acquisition software system using Cerno's patented MSIntegrity calibration technology to work directly with data from a wide range of mass spectrometers.
Formula ID normally requires accurate mass measurements typically provided by high resolution time-of-flight (TOF), Orbitrap or FT-ICR instrumentation.
Ion traps typically cannot provide accurate mass measurements due to physical limitations of the ion trap analyser, particularly in the older 3D trap designs such as the instrument used in this study.
However, the cooperation with Wold has demonstrated that by carefully controlling the ion trap conditions, it is possible to attain high spectral accuracy which is suitable in itself for Formula ID.
The approach utilises Cerno's sClips technology to correct the instrument line-shape and allows highly accurate matching of the isotope pattern of the unknown ion against theoretically calculated ion candidates.
One of the benefits of the approach is that it requires no known calibration ions, and instead utilises the ion traps ability to scan in high resolution mode to resolve the isotope peaks.
The monoisotopic peak of the analyte ion can then be used to correct the measured isotope pattern for accurate matching to theoretical spectra.
Ming Gu, VP of research for Cerno Bioscience comments: "We were quite surprised by the level of performance achievable on the 3D trap design.
"This work is a good indication that even better results should be obtainable with more modern linear ion trap designs".
The approach extends the versatility of ion trap instruments by enabling them to provide formula identification, a capability previously not thought possible.
