R. Graham Cooks
Purdue University
765 Papers
10K Citations
R. Graham Cooks is an academic researcher from Purdue University. The author has contributed to research in topics: Mass spectrometry & Ion. The author has an hindex of 110, co-authored 736 publications. Previous affiliations of R. Graham Cooks include Sapienza University of Rome & University of Giessen.
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Papers
Precursor and Neutral Loss Scans in an RF Scanning Linear Quadrupole Ion Trap.
Dalton T. Snyder,Lucas J. Szalwinski,Robert L. Schrader,Valentina Pirro,Ryan T. Hilger,R. Graham Cooks +5 more
TL;DR: The implementation of orthogonal double resonance precursor and neutral loss scans on the Mini 12 using constant RF voltage is described and it is concluded that the ac frequency scan variant of these MS/MS scans is preferred due to electronic simplicity.
A miniature cylindrical quadrupole ion trap: simulation and experiment.
TL;DR: A cylindrical quadrupole ion trap has been constructed, its geometry optimized, and its performance examined in the mass-selective instability scan mode to explore the effects of geometry on performance and to validate the experimental results.
Ion/surface reactions and ion soft-landing
TL;DR: Ion/surface collision phenomena in the hyperthermal collision energy regime (1-100 eV) are reviewed, with emphasis on chemical processes associated with the impact of small organic and biological ions at functionalized self-assembled monolayer surfaces.
Rapid discrimination of bacteria using a miniature mass spectrometer
Christopher J. Pulliam,Pu Wei,Dalton T. Snyder,Xiao Wang,Zheng Ouyang,Rafal M. Pielak,R. Graham Cooks +6 more
TL;DR: Bacteria colonies were analyzed using paper spray ionization coupled with a portable mass spectrometer and averaged and processed using multivariate analysis to discriminate between different species of bacteria based on their unique phospholipid profiles.
Direct analysis of Stevia leaves for diterpene glycosides by desorption electrospray ionization mass spectrometry
Ayanna U. Jackson,Alessandra Tata,Chunping Wu,Richard H. Perry,Haas George W,Leslie G. West,R. Graham Cooks +6 more
TL;DR: The analysis of Stevia leaves has been demonstrated without any sample preparation using desorption electrospray ionization (DESI) mass spectrometry, and the presence of characteristic glycosides in an all-natural commercial Stevia dietary supplement was confirmed.