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Table 1 Kinetic reaction constants and calibration results for different compounds according to PTR-MS measurements.

From: Noninvasive detection of lung cancer by analysis of exhaled breath

Compound

m/z

kinetic rate constant

(taken from reference [55])

calibration factor*)

benzene

79

1.97·10-9 cm3 sec-1

0.95

isoprene

69

2.0·10-9 cm3 sec-1

2.26

acetone

59

3.9·10-9 cm3 sec-1

1.21

methanol

33

2.7·10-9 cm3 sec-1

0.69

acetonitrile

42

4.5·10-9 cm3 sec-1

1.24

  1. *) The "calibration factor" is the factor used to correct concentrations which are initially determined using the kinetic rate constants as taken from reference [55]. The large "calibration factor" for isoprene is due to fragmentation of protonated isoprene (m/z 69) towards m/z 41.