Citation:
LI Chang, XIE Jie, LIU Mei-Ying, HUANG Ze-Jian, DAI Xin-Hua, JIANG You, FANG Xiang, TIAN Di. Research on Simultaneous Fragmentation and Accumulation Technique Based on Quadrupole-Dual Pressure Linear Ion Trap Mass Spectrometer[J]. Chinese Journal of Analytical Chemistry,
;2023, 51(2): 269-275.
doi:
10.19756/j.issn.0253-3820.221315
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In this work, a quadrupole-dual pressure linear ion trap (Q-DPLIT) tandem mass spectrometer was developed and combined with a simultaneous technique to further improve the sensitivity and accuracy. The instrument consisted of a quadrupole and two hyperbolic ion traps in axial series. The precursor ions were filtered by the quadrupole into the linear ion trap Ⅰ (LITⅠ). At the same time, a composite waveform was applied to the LITI, so that the fragmentation of the precursor ions, isolation and accumulation of product ions occurred simultaneously. Then, the product ions were transferred to the linear ion trap Ⅱ (LITⅡ) for detection. By changing the helium flux introduced into LITⅠ, the ion trapping ability of the ion trap under different fluxes was investigated, and the optimal analysis condition was obtained. The results showed that the number of reserpine ions trapped by Q-DPLIT was 4.2 times as that of Q-LIT under the respective optimal conditions. The target peptide GVFGVF in concentrations ranging from 10 to 100 ng/mL with 100 μg/mL VVFFGG as the matrix was detected by Q-DPLIT. The mass-to-charge ratios (m/z) of VVFFGG and GVFGVF were both 625.3 amu. The ion accumulation time was 0.1-10 s. The signal intensity of the target product ion (m/z = 460.3 amu) measured by the simultaneous technique was improved by 1.3-10 times compared with that without this technique, and the linear correlation coefficient was increased from 0.6693-0.9449 to 0.9942-0.9994. The combination of Q-DPLIT and simultaneous technique could further improve the sensitivity and reduced the interferences of matrices. It was expected to achieve better analytical results in the analysis of trace substances in complex matrices in the future.
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