Table 1.
Gas chromatographic—mass spectrometric identification of secretion components in Paranemastoma quadripunctatum
| Peak | RT (min) | Rel. abund. (in % peak area) | Fragmentation pattern m/z (relative intensity) | Identified as |
|---|---|---|---|---|
| A | 11.39 | 49 | 159 (12), 158 (100), 130 (70), 104 (75), 102 (78), 76 (68), 75 (23), 74 (21), 66 (11), 51 (16), 50 (35) | 1,4-naphthoquinone |
| B | 12.31 | < 1 | 161 (9), 160 (88), 132 (15), 131 (19), 105 (27), 104 (100), 77 (13), 76 (41), 57 (18), 50 (21) | 1,4-naphthalenediol |
| C | 12.97 | 43 | 173 (15), 172 (100), 157 (13), 144 (45), 118 (61), 116 (58), 115 (63), 90 (28), 89 (43), 63 (19) | 6-methyl-1,4-naphthoquinone |
| D | 15.64 | 1 | 189 (12), 188 (100), 173 (37), 160 (36), 159 (41), 158 (45), 132 (11), 131 (19), 130 (30), 104 (20), 102 (81), 101 (17), 89 (89), 76 (42), 69 (23), 50 (26) | 2-methoxy-1,4-naphthoquinone |
| E | 17.00 | 4 | 203 (13) , 202 (100), 187 (34), 174 (26), 173 (48), 172 (33), 146 (6), 145 (14), 144 (17), 131 (15), 118 (13), 116 (54), 115 (40), 103 (76), 89 (29), 77 (27), 69 (13), 63 (17) | 2-methoxy-6-methyl-1,4-naphthoquinone* |
| F | 19.11 | < 1 | 223 (16), 222 (100), 221 (14), 207 (17), 194 (44), 193 (13), 166 (33), 165 (92), 164 (17), 163 (14), 139 (11), 115 (6), 97 (9), 89 (7), 82 (29) | 2-methyl-9,10-anthraquinone |
| G | 20.36 | 1 | 237 (18), 236 (100), 235 (10), 221 (31), 208 (33), 207 (12), 193 (17), 180 (8), 179 (17), 178 (24), 165 (54), 152 (9), 139 (4), 104 (10), 89 (23), 76 (12) | dimethyl-9,10-anthraquinone* |
Components in bold are main components of the secretion; components marked with * have been identified tentatively (on the basis of their mass spectra) only. Quantification of components is based on the relative abundance of peak areas (whole secretion = total of all peak areas = 100%).