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Calibration standard details for microcystins (MC) and nodularin (NOD) and composition of the amino acids on position 2 and 4.
| Compound | Position 2 | Position 4 |
|---|---|---|
| dm-7-MC-RR 1 | Arginine | Arginine |
| MC-RR | Arginine | Arginine |
| NOD | n.a. | n.a. |
| MC-YR | Tyrosine | Arginine |
| dm-7-MC-LR 1 | Leucine | Arginine |
| MC-LR | Leucine | Arginine |
| MC-LY | Leucine | Tyrosine |
| MC-LW | Leucine | Tryptophan |
| MC-LF | Leucine | Phenylalanine |
1 dm = desmethylated.
