Dr. Brenna and Dr. Tobias seek to improve the efficiency and accuracy of steroid detection in urine via the coupling of comprehensive 2D Gas Chromatography (GCxGC) with isotope ration mass spectrometry (IRMS). While Dr. Brenna’s initial research (funded by the PCC in 2008) ran into technological challenges which precluded routine use of his important findings (including reactor system leaks at the required 108 degrees Celsius), PCC TRF funding has enabled R&D efforts by ARC to design equipment capable of withstanding the high temperatures required for wide scale, highly precise isotope analyses of steroids and other doping agents using the novel method designed by Brenna and Tobias. The new ARC reactor design functions in the fast GC-C-IRMS system without leaks and demonstrates good peak fidelity of fast GC Chromatographic peaks. Furthermore, initial characterization of steroid carbon isotope rations is promising, with additional evaluation currently underway.
Potential IRMS Steroidome Benefits:
Cost savings and increased efficiency through increased sample throughpout on a given instrument
Decreased detection limits, allowing for routine testing of multiple PEDs
Evaluation of the micro-reactor prototype is in progress. Once the evaluation process is complete, TRF funding will facilitate the production of a faster electronic card and software development to achieve efficient adoption into labs through inexpensive modification of existing equipment.
HERBERT J. TOBIAS, ANDREW JONES, CHARLIE SPANJERS, LARRY BOWERS, AND J. THOMAS BRENNA. LOW TEMPERATURE CATALYTIC COMBUSTION REACTORS FOR HIGH PRECISION CARBON ISOTOPE MEASUREMENTS IN GAS CHROMATOGRAPHY COMBUSTION ISOTOPE RATIO MASS SPECTROMETRY. ANALYTICAL CHEMISTRY. SUBMITTED.
TOBIAS, H.J.; BRENNA, J.T. LOW TEMPERATURE CATALYTIC COMBUSTION REACTOR FOR GAS CHROMATOGRAPHY ISOTOPE RATIO MASS SPECTROMETRY. 65TH ASMS CONFERENCE ON MASS SPECTROMETRY AND ALLIED TOPICS. 2018. SAN DIEGO, USA.
BRENNA, J.T. TRANSLATIONAL RESEARCH: HIGH VOLUME STEROID STABLE ISOTOPIC STANDARDS FOR ANTI-DOPING APPLICATIONS. 2017 PCC CONFERENCE. 2017. NEW YORK, USA.
TOBIAS, H.J., BRENNA, J.T. CRYOGENIC-FOCUSING FAST GAS CHROMATOGRAPHY ISOTOPE RATIO MASS SPECTROMETRY. 64TH ASMS CONFERENCE ON MASS SPECTROMETRY AND ALLIED TOPICS. 2016. SAN ANTONIO, USA.
TOBIAS, H.J.; RUESCH, J.M.; BRENNA, J.T. HIGH VOLUME STEROID STABLE ISOTOPIC STANDARDS FOR ANTI-DOPING APPLICATIONS. 63RD ASMS CONFERENCE ON MASS SPECTROMETRY AND ALLIED TOPICS. 2015. ST LOUIS, USA.