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논문 기본 정보

자료유형
학술저널
저자정보
Alexandra M. Izydorczak (University at Buffalo) Kayla E. Mascaro (University at Buffalo) Kevin J. Zemaitis (University at Buffalo) Troy D. Wood (University at Buffalo)
저널정보
한국질량분석학회 Mass Spectrometry Letters Mass Spectrometry Letters Vol.16 No.1
발행연도
2025.3
수록면
7 - 12 (6page)

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초록· 키워드

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Neuropeptides, particularly in tissues, can be difficult to detect due to their low amounts and similar structures to precursors. With matrix-assisted laser desorption/ionization mass spectrometry (MALDI MS), conventional organic acid matrices are used to help ionize analytes but can cause matrix interference in the m/z range of common neuropeptides. The high-resolution of Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS) enables distinguishing matrix-derived signals from those of neuropeptides. Another benefit to FTICR MS is the ability to process transients in multiple modes, magnitude-mode and absorption-mode. Using the dried droplet method, leucine enkephalin (LE) samples containing gluten exorphin B5 (B5) internal standard were deposited onto surfaces with a siloxane grid; a stainless-steel target plate (SUS), indium-tin oxide (ITO) slide, and glass slides were used. To improve the crystallization of CHCA, freeze drying was employed. Calibration curves of LE had an R<sup>2</sup> of 0.88 to 0.93 when processed in magnitude-mode or post-processed in absorption-mode when spotted on SUS, ITO slides, or glass slides. Slopes were nearly equal whether processed in absorption- or magnitude mode and did not impact the limit of detection. However, the nature of substrate impacted calibration curve slopes, with ITO slides providing the steepest slope, followed by non-conductive glass, with stainless steel exhibiting the shallowest slopes and sensitivity. Peak shape was improved in absorption-mode (2.5-2.6x improvement of resolution and 1.9-2.9x improvement of S/N), suggesting that absorption-mode processing should be employed in quantitative FTICR MS applications

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Abstract
Introduction
Experimental
Results
Discussion
Conclusions
References

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