GC-O-MS Analysis of Aroma-Active Compounds of Chinese Almonds Obtained by Different Pretreatment Methods
Table 2
Standard curve, coefficient of determination r2, concentration, threshold, and OAV of almond volatile aroma compounds.
No.
Compound
Standard curve
r2
c (μg/g)
Thresholda (μg/kg)
OAV
1
Hexanal
y = 1.54666x − 0.02886
0.9918
0.07275
0.0615
1183
3
Heptaldehyde
y = 0.57836x − 0.00682
0.9821
0.00989
0.028
353
5
1-Nonanal
y = 2.6632128x − 0.19841
0.9511
0.55342
0.0011
503109
6
2-Furaldehyde
y = 0.10991x − 0.01622
0.9792
0.00916
9.562
1
7
(2E, 4E)-Hepta-2,4-dienal
y = 0.10168x − 0.00125
0.9916
0.00073
10
<1
8
Benzaldehyde
y = 0.05102x − 0.03634
0.9872
0.07365
0.75089
98
10
5-Methylfurfural
y = 0.03503x − 0.00015
0.9999
0.00118
1.11
1
11
Phenylacetaldehyde
y = 0.06255x
0.9999
0.00843
0.004
2108
13
Pyrrole-2-carboxaldehyde
y = 0.14937x − 0.01649
0.967
0.0233
65
<1
14
(E)-Cinnamaldehyde
y = 0.34739x + 0.0321
0.9922
0.0874
6
15
15
Cinnamaldehyde
y = 0.4567x − 0.012204
0.9817
0.08279
0.75
110
18
Pentanol
y = 0.11171x-0.00096
0.9938
0.00402
0.1502
27
19
1-Hexanol
y = 0.08612x − 0.000744
0.9773
0.00025
0.0056
45
21
2-Ethylhexanol
y = 0.10393x − 0.000297
0.9968
0.00547
1.63
3
22
2,3-Butanediol
y = 12.16106x + 40.3216
0.9986
56.16106
100
<1
23
Linalool
y = 0.09112x − 0.000975
0.9964
0.03252
0.00022
147818
24
Alpha-terpineol
y = 0.0266x − 0.000039
0.9866
0.00052
1.2
<1
25
2,2,6-Trimethyl-6-vinyltetrahydro-2h-pyran-3-ol
y = 0.03784x − 0.00455
0.9997
0.06427
—
—
27
Benzyl alcohol
y = 0.15829x − 1.21264
0.9982
0.51272
2.54621
201
28
2-Phenylethanol
y = 0.034x − 0.0046
0.9999
0.01211
0.56423
21
29
3-Phenyl-1-propanol
y = 0.86018x − 0.66414
0.9952
0.000062
0.42
<1
30
2-Propen-1-ol, 3-phenyl-
y = 0.05957x − 0.0012
0.9922
0.00055
0.077
7
32
2-Butanone
y = 8.78174x − 0.82822
0.9861
13.92862
30
464
33
Acetophenone
y = 0.03849x − 0.00094
0.9639
0.00154
0.0063
244
35
Dihydrofuran-2(3H)-one
y = 0.1861x − 0.000003
0.9988
0.448601
2
224
36
Gamma-caprolactone
y = 0.04958x − 0.0004353
0.9994
0.0010521
0.26
4
37
Benzyl acetate
y = 0.14146x + 0.0027
0.9966
0.00694
0.364
19
38
Methyl salicylate
y = 0.0843x − 0.0000453
0.9985
0.00282
0.04
71
39
Gamma-nonanoic lactone
y = 0.38231x − 0.02268
0.9733
0.04854
0.0097
5004
41
Methyl palmitate
y = 7.07063x − 0.15572
0.9978
0.23741
2
119
42
Ethyl palmitate
y = 0.7441x − 0.04646
0.998
0.29917
2
150
43
Dihydroactinidiolide
y = 0.3682x + 0.01537
0.9991
0.10462
—
—
46
Benzyl benzoate
y = 0.87324x + 0.06805
0.9881
1.45144
0.341
4256
47
Myrcene
y = 0.3814x + 0.002134
0.9976
0.003904
0.0012
3253
48
Styrene
y = 1.86973x − 0.01247
0.9966
0.02997
0.065
461
52
Acetic acid
y = 1.17119x − 1.01273
0.9975
0.041341
99
<1
53
Hexanoic acid
y = 0.20842x − 0.12782
0.996
0.10747
0.89
121
54
Heptanoic acid
y = 0.19076x − 0.00841
0.9758
0.02493
0.91
27
55
Octanoic acid
y = 0.72953x − 0.02963
0.9972
0.2109
3
70
56
Nonanoic acid
y = 0.32846x + 0.20217
0.9993
0.31828
8.8
36
57
Benzoic acid
y = 0.5697x − 0.03939
0.9742
0.30163
1
302
60
2,5-Dimethylpyrazine
y = 0.14038x − 0.0031
0.9971
0.00336
1.75
2
61
2,6-Dimethylpyrazine
y = 0.00381x + 0.0000183
0.8607
0.00038
0.718
<1
62
Pyrazine,2-ethyl-6-methyl-
y = 0.01872x − 0.0000776
0.9999
0.00012
0.04
3
66
Guaiacol
y = 0.02988x − 0.00064
0.9989
0.00013
0.0015
87
67
2-Methoxy-4-methylphenol
y = 10.6493x + 2.0852
0.9999
2.4725
1.485
166
68
1-(1H-Pyrrol-2-yl)ethanone
y = 0.04444x − 0.00136
0.9999
0.00735
58.58525
<1
69
Phenol
y = 0.96119x − 0.01652
0.9734
0.02673
58.58525
<1
70
Eugenol
y = 7.0991x − 0.11311
0.9969
0.95176
0.0025
380704
72
4-Ethyl-2-methoxyphenol
y = 1.6767x − 0.03218
0.99315
0.50738
0.03
16913
73
2,4-Di-tert-butylphenol
y = 0.73954x − 0.02205
0.9735
0.20284
0.5
406
75
Vanillin
y = 0.75289x − 0.29449
0.988
0.40208
0.053
7586
aThe threshold of aromatic substances is their threshold in water (reference to odor threshold). —, not available from the reference. Compounds detected by both methods were quantified by SAFE.
