Globally optimized targeted secondary electrospray ionization high resolution mass spectrometry (dGOT-SESI-HRMS) and spectral stitching enhanced volatilomics analysis of bacterial metabolites
Fouad Choueiry, Rui Xu, Kelly Meyrath, Jiangjiang Zhu.
Secondary electrospray ionization high-resolution mass spectrometry (SESI-HRMS) is an innovative analytical technique for the rapid and non-invasive analysis of volatile organic compounds (VOCs). However, compound annotation and ion suppression in the SESI source has hindered feature detection, stability and reproducibility of SESI-HRMS in untargeted volatilomics.
Secondary-Electrospray Ionization Mass Spectrometry-Based Online Analyses of Mouse Volatilome Uncover Gut Microbiome-Dictated Metabolic Changes in the Host
Fouad Choueiry, Andrew Gold, Rui Xu, Shiqi Zhang and Jiangjiang Zhu.
The symbiotic relationship between the gut microbial population is capable of regulating numerous aspects of host physiology, including metabolism. Bacteria can modulate the metabolic processes of the host by feeding on nutritional components within the lumen and releasing bioactive components into circulation. Endogenous volatile organic compound (VOC) synthesis is dependent on the availability of precursors found in mammalian metabolism
Prediction of systemic free and total valproic acid by off-line analysis of exhaled breath in epileptic children and adolescents
Mo Awchi, Kapil Dev Singh, Patricia E Dill, Urs Frey, Alexandre N Datta, and Pablo Sinues.
Therapeutic drug monitoring (TDM) of medications with a narrow therapeutic window is a common clinical practice to minimize toxic effects and maximize clinical outcomes. Routine analyses rely on the quantification of systemic blood concentrations of drugs. Alternative matrices such as exhaled breath are appealing because of their inherent non-invasive nature. This is especially the case for pediatric patients. We have recently
Exhaled volatile fatty acids, ruminal methane emission and their diurnal patterns in lactating dairy cows
M.Z. Islam, S. Giannoukos, Räisänen, K. Wang, X. Ma, F. Wahl, R. Zenobi, M. Niu.
To date, the commonly used methods to assess rumen fermentation are invasive. Exhaled breath contains hundreds of volatile organic compounds (VOC) that can reflect animal physiological processes. In the present study, for the first time, we aimed to use a non-invasive metabolomics approach based on high-resolution mass spectrometry to identify rumen fermentation parameters in dairy cows
Online breath analysis with SESI/HRMS for metabolic signatures in children with allergic asthma
Ronja Weber, Bettina Streckenbach, Lara Welti, Demet Inci, Malcolm Kohler, Nathan Perkins, Renato Zenobi, Srdjan Micic , and Alexander Moeller.
There is a need to improve the diagnosis and management of pediatric asthma. Breath analysis aims to address this by non-invasively assessing altered metabolism and disease-associated processes.
Different reactivities of H3O+(H2O)n with unsaturated and saturated aldehydes: ligand-switching reactions govern the quantitative analytical sensitivity of SESI-MS
Patrik Španěl, Kseniya Dryahina, Maroua Omezzine Gnioua, David Smith
The detection sensitivity of secondary electrospray ionisation mass spectrometry (SESI-MS) is much lower for saturated aldehydes than for unsaturated aldehydes. This needs to be understood in terms of gas phase ion-molecule reaction kinetics and energetics to make SESI-MS analytically more quantitative.
Real-Time Volatile Metabolomics Analysis of Dendritic Cells
Kim Arnold, Philippe Dehio, Jonas Lötscher, Kapil Dev Singh, Diego García-Gómez, Christoph Hess, Pablo Sinues, and Maria L. Balmer
Dendritic cells (DCs) actively sample and present antigen to cells of the adaptive immune system and are thus vital for successful immune control and memory formation. Immune cell metabolism and function are tightly interlinked, and a better understanding of this interaction offers potential to develop immunomodulatory strategies. However, current approaches for assessing the immune cell metabolome are often limited by endpoint measurements, may involve laborious sample preparation, and may lack unbiased, temporal resolution of the metabolome. In this study, we present a novel setup coupled to a secondary electrospray ionization-high resolution mass spectrometric (SESI-HRMS) platform allowing headspace analysis of immature andactivated DCs in real-time with minimal sample preparation and intervention, with high technical reproducibility and potential for automation.
UHPLC-MS/MS-Based Identity Confirmation of Amino Acids Involved in Response to and Side Effects from Antiseizure Medications
Mo Awchi, Pablo Sinues, Alexandre N. Datta, Diego García-Gómez, and Kapil Dev Singh
Real-time breath analysis using secondary electrospray ionization coupled with high-resolution mass spectrometry is a fast and noninvasive method to access the metabolic state of a person. However, it lacks the ability to unequivocally assign mass spectral features to compounds due to the absence of chromatographic separation. This can be overcomed by using exhaled breath condensate and conventional liquid chromatography–mass spectrometry (LC–MS) systems.