SIM chromatogram (target ion: 250 m/z) representing t-2-octenal (a) and t-2-nonenal (b) as PFBHA derivatives at two different levels of concentrations: (a) 10.4 µg/L (black line) and 2.6 µg/L (blue line)

(1)

Figure S1. SIM chromatogram (target ion: 250 m/z) representing t-2-octenal (a) and t-2-nonenal (b) as PFBHA derivatives at two different levels of concentrations: (a) 10.4 µg/L (black line) and 2.6 µg/L (blue line); (b) 21.6 µg/L (black line) and 8.6 µg/L (blue line).

2 5 . 0 0 2 6 . 0 0 2 7 . 0 0 2 8 . 0 0 2 9 . 0 0 3 0 . 0 0 3 1 . 0 0 3 2 . 0 0

0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 1 8 0 0 2 0 0 0 2 2 0 0 2 4 0 0 2 6 0 0

T im e - - >

A b u n d a n c e

I o n 2 5 0 . 0 0 ( 2 4 9 . 7 0 t o 2 5 0 . 7 0 ) : C _ 1 _ 1 7 0 4 2 0 1 4 . D \ d a t a . m s I o n 2 5 0 . 0 0 ( 2 4 9 . 7 0 t o 2 5 0 . 7 0 ) : A _ 3 _ 1 7 0 4 2 0 1 4 . D \ d a t a . m s

a

b

(2)

Figure S2. SIM chromatogram (target ion: 117 m/z) representing phenylacetaldehyde (c) as PFBHA derivative at two different levels of concentrations: 162.6 µg/L (black line) and 54.2 µg/L (blue line).

32.50 32.60 32.70 32.80 32.90 33.00 33.10 33.20 33.30 33.40 33.50 33.60 33.70 33.80 4000

6000 8000 10000 12000 14000 16000 18000 20000

Time-->

Ion 117.00 (116.70 to 117.70): C_1_17042014.D\ data.ms Ion 117.00 (116.70 to 117.70): A_3_17042014.D\ data.ms

c

(3)

Figure S3. SIM chromatogram (target ion: 239 m/z) representing hexanal (d) as PFBHA derivative at two different levels of concentrations 8.45 µg/L (black line) and 2.11 µg/L (blue line).

2 0 .6 0 2 0 .8 0 2 1 .0 0 2 1 .2 0 2 1 .4 0 2 1 .6 0 2 1 .8 0 2 2 .0 0 2 2 .2 0 2 2 .4 0 2 2 .6 0

0 2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 1 8 0 0 2 0 0 0 2 2 0 0

T im e -->

A b u n d a n c e

Io n 2 3 9 .0 0 (2 3 8 .7 0 to 2 3 9 .7 0 ): C _ 1 _ 1 7 0 4 2 0 1 4 .D \ d a ta .m s Io n 2 3 9 .0 0 (2 3 8 .7 0 to 2 3 9 .7 0 ): A _ 3 _ 1 7 0 4 2 0 1 4 .D \ d a ta .m s

d

(4)

Figure S4. SIM chromatogram (target ion: 252 m/z) representing methional (e) as PFBHA derivative at two different levels of concentrations: 52.5 µg/L (black line) and 13.1 µg/L (blue

2 9 . 9 0 3 0 . 0 0 3 0 . 1 0 3 0 . 2 0 3 0 . 3 0 3 0 . 4 0 3 0 . 5 0 3 0 . 6 0 3 0 . 7 0 3 0 . 8 0 3 0 . 9 0 3 1 . 0 0 0

2 0 0 4 0 0 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 1 8 0 0 2 0 0 0 2 2 0 0 2 4 0 0 2 6 0 0

T im e -->

I o n 2 5 2 . 0 0 (2 5 1 . 7 0 t o 2 5 2 . 7 0 ): C _ 1 _ 1 7 0 4 2 0 1 4 . D \ d a t a . m s I o n 2 5 2 . 0 0 (2 5 1 . 7 0 t o 2 5 2 . 7 0 ): A _ 3 _ 1 7 0 4 2 0 1 4 . D \ d a t a . m s

e

(5)

Figure S5. SIM chromatogram (target ion: 293 m/z) representing t-2-hexenal as PFBHA derivative at two different levels of concentrations: 12.5 µg/L (black line) and 3.1 µg/L (blue line).

2 4 .0 0 2 4 .5 0 2 5 .0 0 2 5 .5 0 2 6 .0 0 2 6 .5 0 2 7 .0 0 2 7 .5 0 2 8 .0 0

0 5 0 1 0 0 1 5 0 2 0 0 2 5 0 3 0 0 3 5 0 4 0 0 4 5 0 5 0 0 5 5 0 6 0 0 6 5 0

T im e -->

A b u n d a n c e

Io n 2 9 3 .0 0 (2 9 2 .7 0 to 2 9 3 .7 0 ): C _ 1 _ 1 7 0 4 2 0 1 4 .D \ d a ta .m s Io n 2 9 3 .0 0 (2 9 2 .7 0 to 2 9 3 .7 0 ): A _ 3 _ 1 7 0 4 2 0 1 4 .D \ d a ta .m s

f

(6)

Figure S6. HPLC chromatogram representing glyceraldehyde, glyoxylic acid, acetaldehyde as DNPH derivatives at two different concentration levels.

14 16 18 20 22 24 26 28 30 min

mAU

0 500 1000 1500 2000 2500

DAD1 B, Sig=365,16 Ref=off (FEDERICO\DNPH_RETTA_28052014 2014-05-28 16-29-11\D_1.D)

Glyceraldehyde

Glyoxylic acid

Acetaldehyde