Table 1.
Identified non-hydrocarbon compounds in the headspace, rectal glands, tergal glands, and cuticle of Z. cucumis. - denotes a compound not detected in extraction types, and numerical values represent the compound percentages. Note that the percentages of compounds from the tergal gland and cuticle presented in this table are calculated using the sum of both volatile compounds and hydrocarbons. RI: Kovats retention index calculated by using n-alkane series; RI (ref): RI from the literature; MRG: male rectal gland; FRG: female rectal gland; MC: male cuticle; FC: female cuticle; MTG: male tergal gland; FTG: female tergal gland; MHS: male headspace; FHS: female headspace.
| No | Compound name | RI | RI (Ref) | Diagnostic ions | MRG/% | FRG/% | MHS/% | FHS/% | MTG/% | FTG/% | MC/% | FC/% | Ref |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2,3,5-trimethylpyrazine | 1006 | 1002 | 122 (100) | 0.37 | - | 3.56 | - | - | - | 0.41 | - | 55 |
| 2 | 2,7-dimethyl-1,6-dioxaspiro[4,5]decane | 1070 | 170 (5.9), 126 (18.2 ), 101 (100), 98 (91), 83 (34), 69 (24), 57 (28), 55 (44), 43 (43), 41 (26) | 0.02 | 0.17 | 0.04 | - | - | - | < 0.01 | - | ||
| 3 | 2,3,5,6-tetramethylpyrazine | 1091 | 1089 | 136 (100) | < 0.01 | - | 0.08 | - | - | - | 0.00 | - | 56 |
| 4 | N-(2-methylbutyl)acetamide | 1127 | 129 (6), 114 (14), 100 (52), 72 (100), 60 (70) | 0.01 | < 0.01 | 0.11 | 0.16 | 0.02 | 0.11 | 0.12 | 0.01 | 15 | |
| 5 | N-(3-methylbutyl)acetamide | 1135 | 1150 | 129 (6), 114 (20), 86 (31), 73 (100), 72 (77), 60 (29) | 0.15 | 0.74 | 10.93 | 10.22 | 4.93 | 4.15 | 6.81 | 0.96 | 15 |
| 6 | E, E-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane | 1144 | 184 (13), 140 (21), 115 (100), 112 (100), 97 (80) | 70.13 | 56.39 | 66.66 | 64.56 | 13.29 | 7.05 | 11.02 | 1.82 | 8 | |
| 7 | 2-ethyl-7-methyl-1,6-dioxaspiro[4.5]decane isomer 1 | 1160 | 184 (4.0), 155 (33), 140 (12), 115 (100), 112 (61), 97 (70) | 1.16 | 0.53 | 1.37 | 0.73 | 0.46 | 0.47 | 0.29 | 0.01 | 8 | |
| 8 | 3,5-dimethyl-2-propylpyrazine | 1164 | 150 (10.2), 135 (18.9), 122 (100) | 0.24 | - | 0.12 | - | 0.01 | < 0.01 | < 0.01 | - | ||
| 9 | 2-ethyl-7-methyl-1,6-dioxaspiro[4.5]decane isomer 2 | 1172 | 184 (5.0), 155 (43.7), 140 (10.4), 115 (100), 112 (55.0), 97 (72.9) | 0.07 | 0.08 | 0.11 | 0.13 | 0.05 | 0.07 | 0.02 | < 0.01 | 28 | |
| 10 | 2,7-dimethyl-1,6-dioxaspiro[4.6]undecane | 1188 | 169 (7.8), 140 (20.2), 111 (100), 101 (89.5), 98 (74.9), 83 (48.9), 55 (55) | 0.05 | < 0.01 | 0.09 | < 0.01 | 0.04 | 0.06 | 0.09 | 0.01 | 28 | |
| 11 | N-(2-methylbutyl)propanamide | 1206 | 142 (9), 114 (59), 87 (49), 86 (100), 74 (76), 57 (89) | 0.07 | 0.38 | 0.02 | 0.03 | 1.51 | 0.57 | 0.02 | < 0.01 | 15 | |
| 12 | N-(3-methylbutyl)propanamide | 1211 | 143 (5), 128 (13), 114 (20), 87 (100), 86 (64), 72 (13), 71(12), 57 (63) | 0.23 | 0.81 | 1.69 | 4.44 | 0.79 | 1.25 | 0.82 | 0.29 | 15 | |
| 13 | 2,8-dimethyl-1,7-dioxaspiro[5.5]undecane isomer1 | 1220 | 184 (5), 115 (100), 112 (42), 97 (75) | 6.40 | 3.52 | 7.37 | 4.50 | 0.06 | 0.14 | 2.94 | 0.20 | 8 | |
| 14 | N-(3-methylbutyl)isobutyramide | 1237 | 157 (16), 142 (23), 114 (30),101 (95), 100 (26), 88 (29), 71 (100) | 0.01 | 0.02 | 0.09 | 0.12 | 0.44 | 0.57 | 0.04 | 0.01 | 15 | |
| 15 | 2-ethyl-7-methyl-1,6-dioxaspiro[4.5]decane isomer 3 | 1242 | 184 (4), 155 (28), 140 (7), 115 (100), 112 (45), 97 (79) | 0.44 | 0.02 | 0.08 | 0.01 | 0.07 | 0.02 | 0.18 | < 0.01 | 8 | |
| 16 | 2-methyl-1,7-dioxaspiro[5.6]dodecane | 1264 | 184 (5), 125 (29), 115 (100), 112 (89), 97 (72) | 0.29 | 2.74 | 0.16 | 0.03 | 4.37 | 3.99 | 0.42 | 0.03 | 8 | |
| 17 | 2,8-dimethyl-1,7-dioxaspiro[5.5]undecane isomer2 | 1272 | 184 (4), 115 (100), 112 (30), 97 (81) | 10.52 | 0.95 | 0.38 | 0.14 | 0.78 | 0.08 | 10.93 | 0.20 | 8 | |
| 18 | 2-(1’-hydroxyethyl)−7-methyl-1,6-dioxaspiro[4,5]decane isomer1 | 1333 | 200 (0.2), 169 (1), 155 (100), 131 (21), 128 (31), 113 (36), 95 (24), 85 (98) | 0.34 | 0.31 | 1.20 | 1.71 | 1.15 | 1.20 | 0.38 | 0.06 | 8 | |
| 19 | 2,8-dimethyl-l,7-dioxaspiro[5.5]undecan-3-ol isomer1 | 1337 | 200 (0.3), 156 (36), 128 (21), 115 (7), 113 (35), 112 (100), 85 (34) | 1.09 | 4.57 | 0.74 | 2.80 | 5.02 | 3.09 | 0.56 | 0.06 | 8 | |
| 20 | 2,8-dimethyl-l,7-dioxaspiro[5.5]undecan-3-ol isomer2 | 1347 | 200 (0.1), 156 (32), 128 (65), 115 (4), 113 (19), 112 (100), 97 (46), 81 (53) | 7.34 | 28.67 | 5.06 | 10.30 | 5.43 | 1.82 | 4.05 | 1.10 | 8 | |
| 21 | 1,3-nonanediol | 1361 | 159 ( 0.2), 113 (20.1), 97 (22.8), 75 ( 100) | 0.03 | < 0.01 | < 0.01 | < 0.01 | 0.72 | 0.59 | 2.97 | 0.01 | ||
| 22 | 2-(hydroxymethyl)−8-methyl-1,7-dioxaspiro[5.5]undecane isomer | 1379 | 200 (2), 184 (5), 169 (61), 115 (100), 112 (69), 97 (100) | 0.14 | < 0.01 | 0.07 | 0.02 | 0.05 | 0.03 | 0.08 | < 0.01 | 8 | |
| 23 | 2-(1’-hydroxyethyl)−7-methyl-1,6-dioxaspiro[4,5]decane isomer2 | 1424 | 200 (0.3), 155 (86), 131 (22), 128 (32), (113 (65), 95 (50), 85 (100) | 0.11 | 0.07 | 0.08 | 0.12 | 0.07 | 0.03 | 0.12 | 0.01 | 8 | |
| 24 | Octadecyl acetate | 2192 | 2211 | 312 (0.1), 252 (5), 224 (4), 125 (28), 111 (56), 97 (96), 83 (100), 61 (50) | 0.80 | 0.02 | - | - | 0.03 | < 0.01 | 0.62 | < 0.01 | 57 |