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Abstract: Exhaled breath contains hundreds of volatile organic compounds (VOCs) which offers the potential for diagnosing and monitoring a wide range of diseases. As the breath research field has grown, sampling and analytical practices have become highly varied between groups. Standardisation would allow meta-analyses of data from multiple studies and greater confidence in published results. The Peppermint Consortium has been formed to address this task of standardisation. In the current study we aimed to generate initial benchmark values for thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) analysis of breath samples containing peppermint-derived VOCs. Headspace analysis of peppermint oil capsules was performed to determine compounds of interest. Ten healthy participants were recruited by three groups. Each participant provided a baseline breath sample prior to taking a peppermint capsule, with further samples collected at 60, 90, 165, 285 and 360 min following ingestion. Sampling and analytical protocols were different for each institution, in line with their usual practice. Samples were analysed by TD-GC-MS and benchmarking values determined for the time taken for detected peppermint VOCs to return to baseline values. Sixteen compounds were identified in the capsule headspace. Additionally, 2,3-dehydro-1,8-cineole was uniquely found in the breath samples, with a washout profile that suggested it was a product of peppermint metabolism. Five compounds (α-pinene, β-pinene, eucalyptol, menthol and menthone) were quantified by all three groups. Differences in recovery were observed between the groups, particularly for menthone and menthol. The average time taken for VOCs to return to baseline was selected as the benchmark and were 441, 648, 1736, 643 and 375 min for α-pinene, β-pinene, eucalyptol, menthone and menthol respectively. An initial set of easy-to-measure benchmarking values for assessing the performance of TD-GC-MS systems for the analysis of VOCs in breath is presented. These values will be updated when more groups provide additional data.
Found in: ključnih besedah
Summary of found: ...Volatile organic compounds, breath, diagnostics, standardisation...
Keywords: Volatile organic compounds, breath, diagnostics, standardisation
Published: 11.12.2020; Views: 1370; Downloads: 0
Fulltext (1,10 MB)

Abstract: I cooperated with the Department of Applied Physics III, Faculty of Physics of the Universidad Complutense of Madrid, Spain, as a member of the evaluation committee in charge of awarding with the European mention the doctoral thesis of Dr. Ignacio Vegas Azcárate, entitled “Nanosecond range pulse generators for quality control and diagnosis of Cherenkov telescope cameras”.
Found in: ključnih besedah
Summary of found: ...Cherenkov telescopes (IACTs), IACT camera quality control and diagnostics, nanosecond range pulse generators...
Keywords: very-high energy gamma-ray astronomy, imaging atmospheric Cherenkov telescopes (IACTs), IACT camera quality control and diagnostics, nanosecond range pulse generators
Published: 06.03.2018; Views: 3180; Downloads: 0
Fulltext (86,20 KB)

Found in: ključnih besedah
Keywords: nanobodies, fluobodies, diagnostics
Published: 29.10.2018; Views: 1990; Downloads: 0
Fulltext (4,50 MB)

Found in: ključnih besedah
Summary of found: ...nanobodies, functional tags, diagnostics, extracellular vesicles...
Keywords: nanobodies, functional tags, diagnostics, extracellular vesicles
Published: 10.09.2019; Views: 1881; Downloads: 0
Fulltext (320,99 KB)

Found in: ključnih besedah
Summary of found: ...nanobodies, diagnostics, in vitro selection...
Keywords: nanobodies, diagnostics, in vitro selection
Published: 28.02.2020; Views: 1667; Downloads: 0
Fulltext (104,18 KB)