From: Noninvasive detection of lung cancer by analysis of exhaled breath
1,1-difluoroethane | used as a refrigerant, hence an exogenous origin is possible |
2-propanol | indoor air component in hospital rooms |
2-propanol, 1,1,1-trichloro-2-methyl- | exogenous origin? |
acetamide, N,N-dimethyl- | is released by Tedlar bags |
acetic anhydride and acetyl bromide | unclear origin |
benzene, ethyl- | potentially interesting compound, but one of the volatile BTEX-compounds (= benzene, toluene, ethyl-benzene, xylene) appearing in gasoline |
carbon disulfide | is released by GCMS septa |
cineole | used in flavorings, fragrances, and cosmetics |
diethyl ether | suspected to be an indoor air component in hospital rooms |
ethanol | could be of exogenous origin |
ethylene, tetrachloro- | used in dry cleaning, hence an exogenous origin is possible |
formamide, N,N -dimethyl- | suspected to be an indoor air component in hospital rooms |
isobutane | exogenous origin? (propellant) |
limonene | exogenous origin? (is used in food manufacturing, cosmetics and cleansing agents) |
p-cymene | is contained in essential oils (e.g., in cumin and thyme) |
m-cymene | misidentification possible (mix-up with natural isomer p-cymene) |
menthol mix of isomers | might be contained in candies, toothpaste or foodstuff |
methyl acetate | is observed in healthy volunteers in low concentration (ca. 1 ppb), and increases with increased cardiac output |
n-hexane | there is an ubiquitous pollution with n-hexane in the environment |
n-pentane | marker for oxidative stress |
p-xylene | indoor air component in hospital rooms |
pentane, 2-methyl- and pentane, 3-methyl | potentially interesting compound, but might be released by GCMS septa |
styrene | styrene is sometimes added to the BTEX-compounds (see ethyl-benzene above), making it BTEXS |
trichloroethylene | TCE; groundwater contamination by TCE is an important environmental concern, hence an exogenous origin is possible |