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Table 4 Statistics of column degradation (n \(\ge\) 12). IDs are based on the retention time of each metabolite

From: Freeze-drying: an alternative method for the analysis of volatile organic compounds in the headspace of urine samples using solid phase micro-extraction coupled to gas chromatography - mass spectrometry

IDs

Name

CAS

ANOVA

tTest | p values

A–B

A–C

A–D

A–E

A–F

RT_18.02

Cyclotrisiloxane, hexamethyl-

541-05-9

0.000

0.000

0.000

0.000

0.000

0.000

RT_24.35

Cyclotetrasiloxane, octamethyl-

556-67-2

0.000

0.091

0.000

0.010

0.000

0.001

RT_25.28

Phenyl-pentamethyl-disiloxane

14920-92-4

0.001

0.000

0.240

0.775

RT_28.78

Diisopropyl(ethoxy)silane

90633-16-2

NA

NA

NA

NA

RT_29.80

Cyclopentasiloxane, decamethyl-

541-02-6

0.000

0.000

0.591

0.000

0.370

0.095

RT_35.20

Cyclohexasiloxane, dodecamethyl-

540-97-6

0.000

0.000

0.031

0.000

0.032

0.188

RT_40.19

Isopropoxy*

71579-69-6

0.000

0.246

0.005

0.449

0.013

0.115

  1. A Freeze-dry; B Fresh; C HCl; D NaCl; E NaOH; F Frozen
  2. - Identified in a single treatment
  3. NA not identified in any of the tested treatments
  4. * Isopropoxy-1,1,1,7,7,7-hexamethyl-3,5,5-tris(trimethylsiloxy)tetrasiloxane