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A blow-by-blow account: Extractive electrospray ionization (EESI) quadrupole TOF (QTOF) mass spectrometry has been established with a commercial instrument without hardware modification for the rapid analysis of breath without sample pretreatment (see picture). Sulfur-containing compounds can be selectively detected by using silver cationization in the EESI source—a method of interest for in vivo metabolic studies and clinical diagnosis.
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Chen et al. (2006) studied this question.
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