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J Breath Res

Title:		Comparison of sampling bags for the analysis of volatile organic compounds in breath
Author(s):		Ghimenti S; Lomonaco T; Bellagambi FG; Tabucchi S; Onor M; Trivella MG; Ceccarini A; Fuoco R; Di Francesco F;
Address:		"Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, 56126, Italy"
Journal Title:		J Breath Res
Year:		2015
Volume:		20151214
Issue:		4
Page Number:		47110 -
DOI:		10.1088/1752-7155/9/4/047110
ISSN/ISBN:		1752-7163 (Electronic) 1752-7155 (Linking)
Abstract:		"Nalophan, Tedlar and Cali-5-Bond polymeric bags were compared to determine the most suitable type for breath sampling and storage when volatile organic compounds are to be determined. Analyses were performed by thermal desorption gas chromatography mass spectrometry. For each bag, the release of contaminants and the chemical stability of a gaseous standard mixture containing eighteen organic compounds, as well as the CO2 partial pressure were assessed. The selected compounds were representative of breath constituents and belonged to different chemical classes (i.e. hydrocarbons, ketones, aldehydes, aromatics, sulfurs and esters). In the case of Nalophan, the influence of the surface-to-volume ratio, related to the bag's filling degree, on the chemical stability was also evaluated. Nalophan bags were found to be the most suitable in terms of contaminants released during storage (only 2-methyl-1,3-dioxalane), good sample stability (up to 24 h for both dry and humid samples), and very limited costs (about 1 euro for a 20 liter bag). The (film) surface-to-(sample) volume ratio was found to be an important factor affecting the stability of selected compounds, and therefore we recommended to fill the bag completely"
Keywords:		Breath Tests/*instrumentation/*methods Carbon Dioxide/analysis Gases/chemistry Humidity Ions Partial Pressure Polyethylene Terephthalates Reference Standards Temperature Time Factors Volatile Organic Compounds/*analysis;
Notes:		"MedlineGhimenti, S Lomonaco, T Bellagambi, F G Tabucchi, S Onor, M Trivella, M G Ceccarini, A Fuoco, R Di Francesco, F eng Comparative Study Research Support, Non-U.S. Gov't England 2015/12/15 J Breath Res. 2015 Dec 14; 9(4):047110. doi: 10.1088/1752-7155/9/4/047110"