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We have devised a portable breath acetone analyzer which is able to analyze acetone in exhaled breath quantitatively without a pre-concentrator. This analyzer employed a breath gas sampler, an ultrathin ZnO film gas sensor and a gas separation unit, which is sensitive enough to detect breath acetone with low sub ppm levels and has an upper detection limit of more than 100 ppm. Test results for the human breath acetone are favorably compared to blood ketone (beta-hydroxybutyrate) measurements, indicating that the analyzer can measure the human breath acetone selectively with a high sensitivity. This breath acetone analyzer is a promising candidate to monitor fat burning and lipolysis.

DH2.2 - A portable breath acetone analyzer for a real-time quantitative analysis of exhaled acetone using nano ZnO films and a gas separation unit