Evaluation of Differences in MS/MS Spectra from Two Differentgeneration Q-TOF Instruments: Implications for Metabolomic Database Use

Author(s): Ze-Qin Guo, Zhen-Hua Wang, Xiao-Ying Xu, Dong-Mei Fang, Hua-Yi Qi, Yan Jiang, Zhi-Jun Wu

Journal Name: Current Pharmaceutical Analysis

Volume 11 , Issue 2 , 2015

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Generating reproducible fragmentation patterns is a problem in electrospray ionization mass spectrometry. Two generations of quadrupole time-of-flight(Q-TOF) instruments were selected to evaluate the reproducibility of tandem mass spectrometry(MS/MS) spectra:an old- and a new-generation instrument. Ninety-four MS/MS and MS/MS/MS spectra with information-rich product ions were obtained in positive- or negative-ion mode with two different-generation Q-TOF instruments, BioTOF-Q and micrOTOF- Q. Two principles were selected to optimize the collision energy. On the one hand, maximal structural information is obtained when the collision energy is increased; on the other hand, when most product ions show relative abundance of more than 10%, the lowest collision energy should be selected. The Paired-Samples T Test method was used to analysis these paired-spectra. We found that most product ions were the same and the profiles of the product ions were similar with both Q-TOF instruments. Interestingly, at the low signal to-noise ratio (S/N) of the precursor ion (ion intensity low to 180 counts), the profile of the MS/MS spectrum is very similar to that at a high S/N. Furthermore, when spectra were generated with micrOTOF-Q even before and after a four-year interval, the profiles and product ions were virtually identical. In summary, databases built with different-generation Q-TOF instruments may be universally applicable.

Keywords: Reproducibility, two different-generation, quadrupole time-of-flight, tandem mass spectrometry, paired-samples t test, databases built.

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Article Details

Year: 2015
Published on: 13 February, 2015
Page: [104 - 114]
Pages: 11
DOI: 10.2174/1573412911666141204222241
Price: $65

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