Odor characteristics of the volatile sulfur compounds [VSCs] in human flatus

Range Table - link
Organism Human Homo sapiens
Reference Tangerman A. Measurement and biological significance of the volatile sulfur compounds hydrogen sulfide, methanethiol and dimethyl sulfide in various biological matrices. J Chromatogr B Analyt Technol Biomed Life Sci. 2009 Oct 15 877(28):3366-77. doi: 10.1016/j.jchromb.2009.05.026. p.3376 Table 2PubMed ID19505855
Primary Source [38] Tangerman A, Winkel EG. Intra- and extra-oral halitosis: finding of a new form of extra-oral blood-borne halitosis caused by dimethyl sulphide. J Clin Periodontol. 2007 Sep34(9):748-55. [40] K. Verschueren, Handbook of Environmental Data on Organic Chemical (2nd edn.) Van Nostrand Reinhold Company, New York, Cincinnati, Toronto, London, Melbourne (1983) p. 42PubMed ID17716310
Method P.3370 left column bottom paragraph:"Flatus perception thresholds: Perception threshold values are normally assessed by injection of an odorant into the nostril of panel members [primary source 40]. However, in the odor recognition of a flatus, the nose of the observer of a flatus is in most instances at least at 1 m from the bottom of the offender. A dilution of a flatus of 100 ml into 4–8 m^3 has been assumed before the smell reaches the nose, resulting in a dilution factor of 40000–80000. The theoretical flatus perception threshold values have now been defined as the perception threshold values [primary source 40] times the dilution factor of 4–8 × 10^4. The experimental flatus perception threshold value has been defined as the lowest concentration of the odorant where all panel members detected any odor, when 100 ml of an odorant mixture was delivered from a large 250 ml syringe in about 1 s, 1 meter beneath the nose of the panel members, mimicking a flatus emission. The theoretical and experimental flatus perception thresholds of the VSCs lie in the same range, indicating that the assumed dilution factor has the right order of magnitude."
Comments P.3375 right column 4th paragraph:"[Investigators] developed a bathtub method for quantitative flatus sampling (Fig. 2). This flatus is known in the popular literature as the “bathtub fart” and is the only flatus you can see by the bubble or bubbles. The VSCs in the flatus sample were measured by GC [gas chromatography]. The results are shown in Table 2." See notes beneath table
Entered by Uri M
ID 112381