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Updated: Jun 20, 2026

Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry
Published on: March 9, 2018
Real-time metered dose inhalers (MDIs) characterization by secondary electrospray ionization (SESI)-mass
Ana María Casas-Ferreira1, Miguel Del Nogal Sánchez1, Eliseo Herrero-Hernández1
1Universidad de Salamanca. Departamento de Química Analítica, Nutrición y Bromatología, Plaza de Los Caídos s/n, 37008 Salamanca, Spain. dgg@usal.es.
None:
This study explores the application of secondary electrospray ionization mass spectrometry (SESI-MS) for the real-time characterization of pharmaceutical aerosols from metered-dose inhalers (MDIs). The analysis includes one of the most widely used inhalers worldwide, Ventolin®, a simple formulation containing salbutamol and norflurane for which salbutamol was reliably detected, while norflurane remained undetectable due to its low proton affinity; and Ventoduo®, a multicomponent formulation also including beclomethasone dipropionate, ethanol, and oleic acid for which all major components were successfully detected. The coupling of SESI with high-resolution MS enabled unambiguous identification of all analytes, with excellent mass accuracy, confirming the identity of both active ingredients through characteristic fragmentation patterns. These results demonstrate that SESI-MS, particularly when coupled with high-resolution instrumentation (SESI-HRMS), is a powerful and reliable tool for the comprehensive and real-time analysis of pharmaceutical aerosols, including those with multiple active ingredients and co-solvents.
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