Long-Term System Suitability Evaluation for Mass Accuracy in the Analysis of Small Molecules by High-Resolution Mass Spectrometry

IF 2.7 2区 化学 Q2 BIOCHEMICAL RESEARCH METHODS
Paul Löffler, Svante Rehnstam, Lutz Ahrens, Foon Yin Lai and Alberto Celma*, 
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Abstract

High-resolution mass spectrometry (HRMS) is critical for the identification and characterization of (un)known organic chemicals. In this regard, ensuring high mass accuracy in HRMS instruments is essential for reliable results in nontarget and suspect screening. This study presents a practical approach for evaluating and maintaining mass accuracy over time using ultrahigh pressure liquid chromatography coupled with electrospray ionization Orbitrap HRMS. A set of 13 reference standards, encompassing a range of polarities and chemical families, was analyzed before and after sample analysis batches to assess the impact of various factors on the instrumental performance regarding mass accuracy. The aim is not to recalibrate the system but to provide a reliable snapshot of the mass accuracy over time. The study found that the positive ionization mode exhibited higher accuracy and precision compared with the negative mode. Factors affecting mass accuracy included calibration quality, the number of batch injections, and the time between calibrations, where the two latter factors were related to each other. Results suggest that performing system suitability tests for high-resolution accurate masses with two injections before and after sample analysis is adequate for ensuring acceptable mass spectrometric performance for robust and reliable HRMS data acquisition, but performing three injections is recommended. This protocol ensures that informed decisions can be made with regard to the mass accuracy, the calibration, and a potential recalibration before HRMS data acquisition is performed.

高分辨率质谱法分析小分子质量精度的长期系统适用性评价。
高分辨率质谱(HRMS)是鉴定和表征(未知)有机化学品的关键。在这方面,确保HRMS仪器的高质量准确性对于非目标和可疑筛选的可靠结果至关重要。本研究提出了一种实用的方法来评估和保持质量精度随时间的变化,使用超高压液相色谱和电喷雾电离Orbitrap HRMS。在样品分析批次之前和之后,分析了一套13个参考标准,包括一系列极性和化学族,以评估各种因素对仪器性能的影响,包括质量精度。其目的不是重新校准系统,而是提供随时间变化的质量精度的可靠快照。研究发现,正电离模式比负电离模式具有更高的准确度和精密度。影响质量精度的因素包括校准质量、批次注射次数和校准间隔时间,其中后两个因素相互关联。结果表明,在样品分析之前和之后分别用两次进样对高分辨率精确质量进行系统适用性测试,足以确保可接受的质谱性能,从而获得稳健可靠的HRMS数据采集,但建议进行三次进样。该方案确保在执行HRMS数据采集之前,可以就质量精度、校准和可能的重新校准做出明智的决定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.50
自引率
9.40%
发文量
257
审稿时长
1 months
期刊介绍: The Journal of the American Society for Mass Spectrometry presents research papers covering all aspects of mass spectrometry, incorporating coverage of fields of scientific inquiry in which mass spectrometry can play a role. Comprehensive in scope, the journal publishes papers on both fundamentals and applications of mass spectrometry. Fundamental subjects include instrumentation principles, design, and demonstration, structures and chemical properties of gas-phase ions, studies of thermodynamic properties, ion spectroscopy, chemical kinetics, mechanisms of ionization, theories of ion fragmentation, cluster ions, and potential energy surfaces. In addition to full papers, the journal offers Communications, Application Notes, and Accounts and Perspectives
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