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Type: Artigo de periódico
Title: Petroleomics By Easi(+/-) Ft-icr Ms.
Author: Corilo, Yuri E
Vaz, Boniek G
Simas, Rosineide C
Nascimento, Heliara D Lopes
Klitzke, Clécio F
Pereira, Rosana C L
Bastos, Wagner L
Santos Neto, Eugênio V
Rodgers, Ryan P
Eberlin, Marcos N
Abstract: An ambient ionization/desorption technique, namely, easy ambient sonic-spray ionization mass spectrometry (EASI), has been applied to crude oil samples. From a single droplet of the sample placed on an inert surface, EASI(+/-) is shown to promote efficient desorption and ionization of a myriad of polar components via the action of its cloud of very minute supersonic bipolar charged droplets. The gaseous [M + H](+) and [M - H](-) ions concurrently formed by EASI(+/-) were analyzed by Fourier transform mass spectrometry (FT-ICR MS), and a total of approximately 6000 acidic and basic components have been attributed. EASI(+/-) FT-ICR MS of crude oils is show to be almost as fast as ESI(+)/ESI(-) FT-ICR MS, providing similar compositional information of polar components and spectral quality comparable to that of a commercial nonochip-based robotic ESI device. EASI(+/-) requires no sample workup thus eliminating risks of contamination during sample manipulation and memory effects because of carry over in pumping ESI lines. More importantly, EASI(+/-) is a voltage-free ionization technique therefore eliminating risks of redox processes or duality of ionization mechanisms that can be observed in voltage-assisted processes. Data visualization via typical petroleomic plots confirms the similarity of the compositional information provided by EASI(+/-) compared to ESI(+)/ESI(-). The ambient EASI(+/-) FT-ICR MS method requires no voltage switching in changing the ion polarity mode, offering a workup, heating and voltage-free protocol for petroleomic studies performed at open atmosphere directly on the undisturbed crude oil sample.
Citation: Analytical Chemistry. v. 82, n. 10, p. 3990-6, 2010-May.
Rights: fechado
Identifier DOI: 10.1021/ac100673v
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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