Skip to main content

Table 2 Ionization method and masses identified by the random forest method

From: Gram-negative and -positive bacteria differentiation in blood culture samples by headspace volatile compound analysis

Ionization

Ion

Identified masses [m/z]

Tentative compound

EI-MS

e

2

H2

IMR-MS

Hg+

34–36, 64, 66

H2S (34)a

Xe+

35, 64, 76, 80

  1. EI-MS electron impact mass spectrometry; IMR-MS ion–molecule reaction mass spectrometry
  2. aSignalling at m/z 36 is 4.20 % of m/z 34 signalling which matches exactly the expected value of 4.21 % for the presence of the 34S isotope of H2S