Table 2.
Accurate masses of observed ions of ciguatoxins detected in red snappers in Vietnam.
| Sample | CTX-1B | 54-deoxy CTX-1B | 52-epi-54-deoxyCTX-1B | |||||||
| Ions | [M+NH4]+ | [M+Na]+ | [M+K]+ | [M+NH4]+ | [M+Na]+ | [M+K]+ | [M+NH4]+ | [M+Na]+ | [M+K]+ | |
| Formula | C60H90N1O19 | C60H86O19Na | C60H86O19K | C60H90N1O18 | C60H86O18Na | C60H86O18K | C60H90N1O18 | C60H86O18Na | C60H86O18K | |
| Theoretical Values | 1128.6102 | 1133.5656 | 1149.5395 | 1112.6152 | 1117.5706 | 1133.5446 | 1112.6152 | 1117.5706 | 1133.5446 | |
| Authentic CTX-1B | 1128.6074 (2.4) *1 |
1133.5626 (2.6) |
1149.5345 (4.3) |
- | - | - | - | - | - | |
| Fish flesh from incident 1 | 1128.6137 (−3.1) |
1133.5688 (−2.9) |
1149.5497 (−8.9) |
1112.6185 (−2.9) |
ND | ND | 1112.6091 (5.5) |
ND | ND | |
| Fish viscera from incident 2 | 1128.6070 (2.8) |
ND *2 | ND | 1112.6129 (2.1) |
ND | ND | 1112.6073 (7.1) |
ND | ND | |
| Fish flesh from incident 2 | 1128.6059 (3.8) |
1133.5623 (2.9) |
1149.5359 (3.1) |
1112.6141 (1.0) |
ND | ND | 1112.6142 (0.9) |
1117.5734 (−2.5) |
ND | |
*1 Measured values (error ppm). *2 ND: Not detected.