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Table 3 Concentrations (µg Kg−1 fresh weight) and odour activity values (OAVs) of aroma-active odorants (FD ≥ 8) in raw, boiled and fried giant snail (A. fulica)

From: Identification of characteristic aroma compounds in raw and thermally processed African giant snail (Achatina fulica)

No. DB-5 Compound Snail Conc. Snail Conc. Odour thresholds in water µg Kg−1 OAVs
Raw Boiled Fried Raw Boiled Fried
1 663 2-Methylbutanal nd 16.8 ± 1.0 30.0 ± 1.0 1a nd 16 30
2 820 2-Methylpyrazine nd 100.3 ± 0.7 126.7 ± 0.4 60b nd 1.7 2.1
3 906 2,5-Dimethylpyrazine nd 40.0 ± 1.4 45.1 ± 1.5 800b nd < 1 < 1
4 907 2-Furanmethanethiol nd nd 4.7 ± 0.1 0.005b nd nd 940
5 922 2-Acetyl-1-pyrroline nd nd 123.6 ± 2.2 0.1a nd nd 1236
6 963 Benzaldehyde 13.5 ± 0.0 16.4 ± 0.1 20.0 ± 0.1 350a < 1 < 1 < 1
7 977 1-Octen-3-one 1.2 ± 0.0 0.9 ± 0.0 0.1 ± 0.0 0.005a 240 180 20
8 1006 Octanal 45.9 ± 1.0 63.2 ± 1.0 78.9 ± 2.5 8a 5.7 7.9 9.9
9 1020 2-Acetylthiazole nd 5.7 ± 0.1 15.9 ± 0.1 10a nd < 1 1.5
10 1031 2-Acetylpyridine nd 70.0 ± 2.1 102 ± 1.5 19a nd 3.7 5.4
11 1067 4-Hydroxy-2,5-dimethyl-3(2H) furanone nd nd 46.5 ± 1.0 5a nd nd 9.3
12 1088 2-Methoxyphenol nd nd 12.9 ± 0.1 2.5a nd nd 5.2
13 1107 3-Hydroxy-4,5-dimethyl-2(5H) furanone nd 6.1 ± 0.1 11.2 ± 1.4 0.001a nd 6100 11,200
14 1457 β-Ionone 5.4 ± 0.1 0.7 ± 0.0 nd 0.03c 180 23 nd
15 1534 β-Iso-methyl ionone 12.2 ± 0.1 1.1 ± 0.0 0.9 ± 0.0 nd nd nd nd
  1. Mean ± SD
  2. OAVs odour activity value was calculated by dividing the concentration with the threshold value of compound in water, nd not determined
  3. aRychlik et al. [35]
  4. bTressl [36]
  5. cSilva et al. [37]