Determination of Linear Response in the Detection of Aroma Compounds by Atmospheric Pressure Ionization−Mass Spectrometry (API-MS)

• Autores: Buffo, Roberto Americo; Zehentbauer, Gerhard; Reineccius, Gary A
• Año de publicación: 2005
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Apci-Ms; Aroma Compounds; Linear Response; Breath Analysis
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Linearity and detection thresholds of atmospheric pressure ionization−mass spectrometry (API-MS) were determined for 11 aroma compounds in air at concentrations ranging from 50 ppb to ∼450 ppm (moles of volatile per mole of air). In most cases, the protonated molecular ion (i.e., m/z = M + 1) was the base peak throughout the range; however, some compounds showed an increase in fragmentation at lower concentrations. Detection limits varied greatly (from 50 ppb to 14 ppm) depending upon the aroma compound being measured. The linear range was also strongly dependent upon the aroma compound, with values ranging from <10-fold change in concentration to >4000-fold change in concentration depending upon the volatile being studied. The two volatiles with poor detection thresholds also exhibited the smallest linear range. Most compounds had linear ranges of >200. There was no apparent relationship between gas-phase basicity and either detection limit or linear range.
Fil: Buffo, Roberto Americo. University of Minnesota; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Planta Piloto de Procesos Industriales Microbiológicos; Argentina
Fil: Zehentbauer, Gerhard. University of Minnesota; Estados Unidos
Fil: Reineccius, Gary A. University of Minnesota; Estados Unidos