Application of hs-spme-gc-ms derived variables for monitoring ripening induced changes in cheese volatile compounds Fig. S1



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Subtotal (%)

61.5

30.3

50.3

13.5

37.2

9.6

32.9

7.6

15.4

12.0

24.8

13.4

49.6

20.0

39.4

17.2










ALDEHYDES

















































552

MS, RI, CoI

1.89

Methyl propanal

nd

nd

nd

nd

tr

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

649

MS, RI, CoI

2.57

3-Methylbutanal

nd

nd

0.1

0.1

0.4

0.2

nd

nd

0.4

nd

1.4

tr

nd

nd

nd

nd

659

MS, RI, CoI

2.68

2-Methylbutanal

nd

nd

nd

nd

tr

nd

nd

nd

nd

nd

0.9

nd

nd

nd

nd

nd

965

MS, RI, CoI

9.97

Benzaldehyde

tr

tr

0.2

0.3

tr

tr

nd

0.2

1.7

2.1

tr

tr

nd

tr

nd

nd

1056

MS, RI, CoI

11.65

Phenyl acetaldehyde

nd

nd

nd

nd

nd

nd

nd

tr

nd

nd

nd

nd

nd

nd

nd

nd










Subtotal (%)

tr

tr

0.3

0.4

0.4

0.2

0.0

0.2

2.1

2.1

2.3

tr

0.0

tr

0.0

0.0










MISCELLANEOUS

















































485

MS, RI, CoI MS, RI, CoI

1.67

Diethyl ether

tr

nd

tr

3.7

tr

tr

tr

tr

tr

tr

1.1

tr

tr

tr

tr

tr

531

MS, RI, CoI

1.76

Dichloromethane

2.8

5.0

2.1

2.0

2.2

1.3

nd

nd

0.8

1.3

2.7

4.3

4.4

3.0

4.5

5.9

600

MS, RI, CoI

2.08

Hexane

3.5

nd

0.5

nd

tr

nd

tr

nd

tr

nd

nd

nd

3.5

nd

5.9

nd

615

MS, RI, CoI

2.20

Chloroform

nd

nd

1.3

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

773

MS, RI, CoI

4.78

Toluene

tr

nd

0.4

tr

tr

tr

tr

0.4

nd

nd

tr

nd

nd

nd

nd

nd

864

MS, RI, CoI

7.77

p-Xylene

nd

nd

tr

tr

tr

nd

nd

tr

nd

nd

nd

nd

nd

nd

nd

nd

1024

MS, RI, CoI

11.33

Limonene

tr

nd

0.4

tr

tr

nd

tr

tr

nd

nd

nd

nd

nd

nd

1.6

tr

1100

MS, RI, CoI

12.60

Undecane

nd

nd

nd

nd

nd

nd

tr

nd

nd

nd

nd

nd

nd

nd

nd

nd

1200

MS, RI, CoI

14.23

Dodecane

nd

nd

tr

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

1300

MS, RI, CoI

15.72

Tridecane

nd

nd

0.6

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

1400

MS, RI, CoI

17.01

Tetradecane

nd

nd

0.1

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd

nd










Subtotal (%)

6.3

5.0

5.4

5.7

2.2

1.3

tr

0.4

0.8

1.3

3.8

4.3

7.9

3.0

12.0

5.9










Total (%)

93.6

103

93.3

60.9

56.1

99.6

91.6

87

84.7

82.4

74.4

84.3

87

73.1

90.5

69.5

Total number of identified compounds

(both PDMS and PA)

27

65

49

40

27

22

28

23

a EC1 and CC1, day1; EC2 and CC2, day 5; EC3 and CC3, day 20; EC4 and CC4, day 30; b Mean value of three independent measurements (both extraction and GC/MS); c Literature values of retention indices (NIST Chemistry Web Book); d MS – Identification based on mass spectra comparison, RI – estimated retention time (index)/order of elution and CoI-coinjection with an authentic standard; e Microextraction was conducted using polydimethylsiloxane (PDMS) and f polyacryl (PA) fibers. g Broad peaks, with a pronounced tailing effect; h nd-not detected; i tr- trace compounds (less than 0.05% of the total peak area).


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