Table 1.
Molecular masses and retention times of the eight Antarctic microcystin congeners (3–10) identified from two Miers Valley (Antarctica) samples and two common microcystin congeners (1–2).
| Microcystin | Mr a (Da) | RT b (min) |
|---|---|---|
| MC-LR (1) | 994.5 | 7.40 |
| [Gly1, Asp3, Dhb7] MC-LR (3) | 966.5 | 7.27 |
| [Gly1, Asp3, Dhb7] MC-LHar (4) | 980.5 | 7.34 |
| [Gly1, Asp3, ADMAdda5, Dhb7] MC-LR (5) | 994.5 | 7.29 |
| [Gly1, Asp3, ADMAdda5, Dhb7] MC-LHar (6) | 1008.5 | 7.36 |
| MC-RR (2) | 1023.6 | 6.48 |
| [Gly1, Asp3, Dhb7] MC-RR (7) | 1009.6 | 6.29 |
| [Gly1, Asp3, Dhb7] MC-RHar (8) | 1023.6 | 6.38 |
| [Gly1, Asp3, ADMAdda5, Dhb7] MC-RR (9) | 1037.6 | 6.33 |
| [Gly1, Asp3, ADMAdda5, Dhb7] MC-RHar (10) | 1051.6 | 6.42 |
a Molecular weights are rounded to one decimal place; b RT = retention time on a C18 column as per [23].