An increased focus on characterizing the structural heterogeneity of carbohydrates has been driven by their many significant roles in extant life and potential roles in chemical evolution and the origin of life. In this work, multiplexed drift tube ion mobility-Orbitrap mass spectrometry methods were developed to analyze mixtures of disaccharides modified with noncovalent shift reagents. Since traditional coupling of atmospheric pressure drift tube ion mobility cells with Orbitrap mass analyzers suffers from low duty cycles (<0.1%), a frequency modulation scheme was applied to improve the signal-to-noise ratios (SNR). Several parameters such as the resolution setting and maximum injection time of the Orbitrap analyzer and the magnitude and duration of the frequency sweep were investigated for their impact on the sensitivity gains and resolution of disaccharide-shift reagent adducts. The sweep time and disaccharide concentration had a positive correlation with SNR. The magnitude of the frequency sweep had a negative correlation with SNR. However, increasing the frequency sweep improved the resolution of mixtures of disaccharide analytes. Application of frequency-modulated ion mobility-Orbitrap mass spectrometry to four noncovalently modified glucose dimers allowed for the differentiation of three out of these four analytes.

中文翻译：

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用非共价位移试剂通过调频离子迁移率-轨道阱质谱法分离碳水化合物。

由于碳水化合物在现存生命中的许多重要作用以及在化学进化和生命起源中的潜在作用，人们越来越关注表征碳水化合物的结构异质性。在这项工作中，开发了多路漂移管离子迁移率-Orbitrap 质谱法来分析用非共价位移试剂修饰的双糖混合物。由于大气压漂移管离子淌度池与 Orbitrap 质量分析器的传统耦合受到低占空比 (<0.1%) 的影响，因此应用了频率调制方案来提高信噪比 (SNR)。研究了几个参数，例如 Orbitrap 分析仪的分辨率设置和最大进样时间以及频率扫描的幅度和持续时间，以了解它们对二糖位移试剂加合物的灵敏度增益和分辨率的影响。扫描时间和双糖浓度与 SNR 呈正相关。频率扫描的幅度与 SNR 呈负相关。然而，增加频率扫描提高了双糖分析物混合物的分辨率。将调频离子迁移率-Orbitrap 质谱法应用于四种非共价修饰的葡萄糖二聚体，可以区分这四种分析物中的三种。频率扫描的幅度与 SNR 呈负相关。然而，增加频率扫描提高了双糖分析物混合物的分辨率。将调频离子迁移率-Orbitrap 质谱法应用于四种非共价修饰的葡萄糖二聚体，可以区分这四种分析物中的三种。频率扫描的幅度与 SNR 呈负相关。然而，增加频率扫描提高了双糖分析物混合物的分辨率。将调频离子迁移率-Orbitrap 质谱法应用于四种非共价修饰的葡萄糖二聚体，可以区分这四种分析物中的三种。