Table 2.
Changes in the volatile compounds (µg/kg fresh weight) of two apricot varieties at different maturity levels
| Compounds | RI | Hacıhaliloğlu | Kabaaşı | ||||
|---|---|---|---|---|---|---|---|
| Immature | Mature | Over-mature | Immature | Mature | Over-mature | ||
| Esters | |||||||
| Methyl acetate | 807 | 6.64 ± 0.29a | 6.82 ± 0.68a | 6.68 ± 0.46a | 5.09 ± 1.07b | 6.26 ± 0.36ab | 5.73 ± 0.70ab |
| Ethyl acetate | 871 | 0.05 ± 0.01c | nd | 1.52 ± 0.20a | 0.36 ± 0.04b | 0.52 ± 0.09b | 0.36 ± 0.10b |
| Methyl isobutanoate | 914 | nd | 0.18 ± 0.01b | 0.19 ± 0.01b | 0.18 ± 0.07b | 0.20 ± 0.05b | 0.27 ± 0.03a |
| Propyl acetate | 969 | nd | 0.12 ± 0.00b | 0.44 ± 0.06a | nd | nd | nd |
| Methyl butanoate | 982 | nd | 0.55 ± 0.03a | 0.21 ± 0.05c | 0.48 ± 0.07a | 0.41 ± 0.05b | 0.42 ± 0.02b |
| Methyl 2-methylbutyrate | 1008 | 0.12 ± 0.01c | 0.19 ± 0.01ab | 0.21 ± 0.01a | 0.20 ± 0.02ab | 0.19 ± 0.04ab | 0.17 ± 0.02b |
| Butyl acetate | 1069 | nd | 3.38 ± 0.59b | 17.23 ± 3.25a | 0.22 ± 0.03a | 0.59 ± 0.10c | 0.84 ± 0.28c |
| Isobutyl butanoate | 1087 | nd | 0.09 ± 0.01c | nd | 0.15 ± 0.01a | 0.11 ± 0.01b | 0.13 ± 0.01a |
| Butyl butylate | 1214 | 7.35 ± 0.40a | 0.22 ± 0.03c | 0.52 ± 0.16b | nd | nd | nd |
| Hexyl acetate | 1272 | 0.17 ± 0.04 cd | 0.47 ± 0.08b | 1.94 ± 0.41a | 0.34 ± 0.07c | nd | 0.09 ± 0.03d |
| 3-Hexen-1-ol acetate | 1320 | 0.50 ± 0.09b | 0.12 ± 0.02c | nd | 1.36 ± 0.31a | nd | nd |
| Alcohols | |||||||
| 2-Propanol | 921 | 0.17 ± 0.02c | 0.23 ± 0.05b | 0.40 ± 0.02a | 0.11 ± 0.02d | nd | nd |
| Ethanol | 930 | 0.41 ± 0.08c | 1.97 ± 0.30c | 10.76 ± 1.82a | 2.65 ± 0.52cb | 4.03 ± 1.12b | 4.49 ± 1.81b |
| 1-Hepthanol | 1037 | 0.09 ± 0.02b | 0.16 ± 0.03a | nd | 0.10 ± 0.01b | nd | 0.14 ± 0.01a |
| 1-Butanol | 1154 | nd | nd | 1.15 ± 0.24a | nd | nd | 0.25 ± 0.02b |
| 1-Hexanol | 1356 | 17.92 ± 3.97a | 8.20 ± 1.02c | 13.47 ± 2.87b | 1.71 ± 0.29d | 2.66 ± 0.54d | 3.14 ± 0.24d |
| 3-Hexen-1-ol | 1316 | 0.18 ± 0.03c | 0.30 ± 0.05b | 0.39 ± 0.09a | 0.21 ± 0.03c | nd | nd |
| (E)-2-Hexen-1-ol. | 1410 | 15.35 ± 2.68a | 3.70 ± 0.46c | 7.88 ± 0.51b | 1.04 ± 0.16d | 1.12 ± 0.23d | 1.47 ± 0.03d |
| 2-Ethylhexanol | 1491 | 0.46 ± 0.08ab | 0.43 ± 0.02b | 0.44 ± 0.08ab | 0.49 ± 0.15ab | 0.65 ± 0.18ab | 0.66 ± 0.11a |
| Linalool-L | 1547 | 0.31 ± 0.08a | 0.17 ± 0.02b | 0.26 ± 0.06ab | 0.21 ± 0.05ab | 0.15 ± 0.03b | 0.21 ± 0.07ab |
| Aldehydes | |||||||
| Acetaldehyde | 721 | 5.91 ± 0.68d | 15.58 ± 3.08c | 23.20 ± 2.16b | 10.70 ± 2.85 cd | 25.66 ± 7.27ab | 31.12 ± 2.96a |
| Butanal | 858 | 0.26 ± 0.05c | 0.44 ± 0.03b | 0.55 ± 0.03a | nd | nd | nd |
| 2-Methylbutanal | 906 | 0.22 ± 0.05c | 0.26 ± 0.02c | 0.17 ± 0.01c | 1.00 ± 0.39a | 0.39 ± 0.09bc | 0.75 ± 0.37ab |
| 3-Methylbutanal | 910 | 4.91 ± 0.63b | 0.80 ± 0.12c | 1.24 ± 0.12a | 4.49 ± 1.32b | 7.89 ± 2.02a | 4.67 ± 2.11b |
| Hexanal | 1080 | 158.92 ± 32.72a | 43.68 ± 4.21b | 39.37 ± 9.59bc | 17.08 ± 1.79 cd | nd | 5.85 ± 0.34d |
| (Z)-3-Hexenal | 1135 | 1.44 ± 0.25a | 0.36 ± 0.06b | 0.27 ± 0.01b | nd | nd | nd |
| (E)-2-Hexenal | 1225 | 288.26 ± 56.74a | 95.23 ± 12.90b | 75.86 ± 5.27bc | 39.56 ± 4.56 cd | 13.94 ± 2.78d | 15.53 ± 1.02d |
| 2,4-Hexanedial | 1413 | 0.18 ± 0.03a | 0.17 ± 0.04a | nd | nd | nd | nd |
| 2,4-Heptadienal | 1474 | 0.41 ± 0.06a | 0.14 ± 0.02bc | 0.17 ± 0.05b | nd | 0.08 ± 0.04 cd | 0.06 ± 0.02d |
| Hydrocarbons | |||||||
| 1,1-Dimethoxypropane | 859 | nd | nd | nd | 0.21 ± 0.07a | 0.26 ± 0.08a | 0.29 ± 0.07a |
| Decane | 993 | 2.21 ± 0.27b | 2.56 ± 0.34ab | 2.93 ± 0.12a | 2.15 ± 0.07b | 2.57 ± 0.38ab | 2.70 ± 0.68ab |
| Pentadecane | 1059 | nd | 0.11 ± 0.01b | nd | 0.10 ± 0.01b | 0.11 ± 0.02b | 0.13 ± 0.00a |
| Undecane | 1084 | nd | 1.22 ± 0.06a | 1.22 ± 0.26a | 0.65 ± 0.16b | 0.74 ± 0.12b | 0.75 ± 0.15b |
| Ketones | |||||||
| 2-Propanone | 795 | 4.21 ± 0.76bc | 3.74 ± 0.86c | 8.78 ± 1.71a | 3.95 ± 1.11bc | 6.51 ± 1.69ab | 4.29 ± 1.62bc |
| 6-Methyl-5-hepten-2-one | 1344 | 0.10 ± 0.02a | 0.11 ± 0.02a | 0.15 ± 0.03a | 0.11 ± 0.03a | 0.12 ± 0.03a | 0.13 ± 0.03a |
| Β-ionone | 1669 | nd | 1.25 ± 0.23b | 2.93 ± 0.36a | nd | 0.36 ± 0.08c | 0.14 ± 0.01d |
| Dihydro-β-ionone | 1855 | 0.62 ± 0.13c | 5.74 ± 1.28b | 9.33 ± 1.32a | nd | 1.09 ± 0.22c | 1.21 ± 0.07c |
| Terpenes | |||||||
| I-Limonene | 1196 | 0.77 ± 0.10b | 0.94 ± 0.15ab | 1.05 ± 0.14a | 0.30 ± 0.06c | 0.40 ± 0.20c | 0.39 ± 0.04c |
Data are expressed as mean ± SD
Mean ± SD followed by the same letter, within a row, are not significantly different (p > 0.05)
nd not detected