Table 1.
Volatile extract composition of Dendranthema nankingense seeds.
| No. | Retention time on DB-WAX (min) | Compounds | RIs | Identification and MS ions (EI)a | Total area (%) | Approximate concentration (μg/mL extract)b | |
|---|---|---|---|---|---|---|---|
|
| |||||||
| DB-WAX | HP-1 | ||||||
| 1 | 2.63 | 3-Methyl butanal | 924 | <700 | ++++; M+ 86 (16.67), 44 | 4.5 | B |
| 2 | 3.10 | 2-Ethylfuran | 962 | <700 | ++++; M+ 96 (32.46), 81 | 0.3 | C |
| 3 | 3.45 | Pentanal | 985 | <700 | ++++; M+ 86 (6.59), 44 | 1.7 | C |
| 4 | 4.06 | α-Pinene | 1021 | 921 | ++++; M+ 136 (7.67), 93 | 0.2 | D |
| 5 | 4.78 | 2-Methylbutanoic acid ethyl ester | 1059 | 841 | ++++; M+ 130 (2.03), 57 | 0.2 | D |
| 6 | 4.91 | Camphene | 1065 | 942 | +++; M+ 136 (15.98), 93 | 0.4 | C |
| 7 | 5.41 | Hexanal | 1086 | 779 | ++++; M+ 100 (1.21), 44 | 19.8 | A |
| 8 | 5.59 | 2-Methyl-1-propanol | 1093 | <700 | ++++; M+ 74 (15.32), 43 | 1.1 | C |
| 9 | 5.81 | β-Pinene | 1102 | 967 | ++++; M+ 136 (8.83), 93 | 0.6 | C |
| 10 | 5.96 | 3-Pentanol | 1110 | <700 | ++++; M+ 88 (0.65),59 | 0.4 | C |
| 11 | 6.19 | Sabinene | 1120 | 966 | +++; M+ 136 (12.19), 93 | 1.9 | C |
| 12 | 6.27 | 2-Pentanol | 1124 | <700 | ++++; M+ 88 (1.03), 45 | 1.0 | C |
| 13 | 6.61 | 2-Butylfuran | 1139 | 880 | +++; M+ 124 (13.46), 81 | 0.1 | D |
| 14 | 6.84 | 1-Butanol | 1148 | <700 | ++++; M+ 74 (1.86), 56 | 0.1 | D |
| 15 | 7.25 | 2-Ethyl-hexanal | 1165 | 937 | +++; M+ 128 (2.17), 57 | 0.2 | D |
| 16 | 7.36 | β-Myrcene | 1169 | 984 | +++; M+ 136 (5.24), 41 | 0.5 | C |
| 17 | 7.62 | α-Terpinene | 1178 | 1007 | ++++; M+ 136 (42.98), 121 | 0.1 | D |
| 18 | 7.80 | 2-Heptanone | 1185 | 872 | ++++; M+ 114 (6.60), 43 | 0.3 | C |
| 19 | 8.11 | D-limonene | 1195 | 1032 | ++++; M+ 136 (23.41), 68 | 1.4 | C |
| 20 | 8.22 | 3-Methyl-2-butenal | 1199 | 759 | +++; M+ 84 (100.00), 55 (77.16) | 0.1 | D |
| 21 | 8.30 | 1,8-Cineole | 1202 | 1020 | ++++; M+ 154 (37.13), 43 | 1.0 | C |
| 22 | 8.45 | 3-Methyl-1-butanol | 1208 | 721 | ++++; M+ 88 (0.61), 55 | 5.2 | B |
| 23 | 8.71 | (E)- 2-Hexenal | 1219 | 829 | +++; M+ 98 (22.10), 41 | 0.4 | C |
| 24 | 9.12 | 2-Pentyl-furan | 1236 | 981 | +++; M+ 138 (18.35), 81 | 3.4 | B |
| 25 | 9.38 | (Z)-Ocimene | 1246 | 1025 | +++; M+ 136 (5.87), 93 | 0.2 | D |
| 26 | 9.59 | 1-Pentanol | 1254 | 759 | ++++; M+ 88 (1.16), 42 | 1.8 | C |
| 27 | 9.74 | Styrene | 1259 | 875 | +++; M+ 104 (100.00), 103 (48.72) | 0.5 | C |
| 28 | 10.06 | β-Cymene | 1271 | 998 | +++; M+ 134 (26.37), 119 | 0.6 | C |
| 29 | 10.35 | Terpinolen | 1281 | 1078 | +++; M+ 136 (62.05), 93 | 0.4 | C |
| 30 | 10.62 | Octanal | 1290 | 980 | ++++; M+ 128 (1.20), 43 | 0.3 | C |
| 31 | 11.07 | 2-Ethenyl-2-butenal | 1307 | n.d. | ++; M+ 96 (43.07), 67 | 0.1 | D |
| 32 | 11.50 | (Z)-2-Heptenal | 1324 | 932 | ++++; M+ 112 (6.85), 41 | 0.8 | C |
| 33 | 11.66 | 2-Methyl-3-octanone | 1331 | 1068 | +++; M+ 142 (4.55), 43 | 0.1 | D |
| 34 | 11.92 | 6-Methyl-5-hepten-2-one | 1341 | n.d. | +++; M+ 126 (11.16), 43 | 0.1 | D |
| 35 | 12.32 | 1-Hexanol | 1356 | 862 | ++++; M+ 102 (0.58), 56 | 3.4 | B |
| 36 | 13.12 | (Z)- 3-Hexen-1-ol | 1385 | 835 | +++; M+ 100 (3.35), 67 | 0.1 | D |
| 37 | 13.38 | Nonanal | 1394 | 1083 | ++++; M+ 142 (1.01), 57 | 0.3 | C |
| 38 | 13.42 | 3-Octanol | 1395 | 988 | +++; M+ 130 (2.38), 59 | 0.1 | D |
| 39 | 13.70 | (E)-3-Octen-2-one | 1406 | 1014 | +++; M+ 126 (14.38), 43 | 0.2 | D |
| 40 | 13.96 | Thujone | 1417 | 1101 | +++; M+ 152 (6.57), 110 | 0.2 | D |
| 41 | 14.08 | 2-Octanol | 1422 | 995 | +++; M+ 130 (0.63), 45 | 0.1 | D |
EI = electron impact; GC–MS = gas chromatography–mass spectrometry; RI = retention index.
The reliability of the proposed identification has been indicated according to the following: ++++, mass spectrum and retention indices both on polar and nonpolar columns agreed with those of the standards, mass spectral libraries and literature; +++, mass spectrum and retention indices both on polar and nonpolar columns agreed with mass spectral libraries and the literature; ++, mass spectrum and retention index on a polar column agreed with the values from the mass spectral libraries and the literature. MS ions (EI) were given by GC-MS on a DB-WAX column. They consisted of molecular ion M+ (relative abundance) and the base peak ion, or the peak ion with the second-highest relative abundance if the molecular ion was the base peak.
A: 500–1000; B: 100–500; C: 10–100; and D: 1–10.