Table 1.
Chemical variants of microcystin detected in LC-MS/MS analyses
| Microcystin variant | [M+H]+ (m/z) | Microcystis aeruginosa NPLJ-4 | Microcystis sp. RST9501 | Nostoc sp. UK89IIa | Phormidium sp. CENA270 |
|---|---|---|---|---|---|
| [Leu1]MC-LR |
1037 |
76 |
76 |
96 |
31 |
| [Leu1, Asp3]MC-LR |
1023 |
19 |
<1 |
2 |
18 |
| [Met1]MC-LR |
1055 |
1 |
18 |
- |
- |
| [Met1, Asp3]MC-LR |
1041 |
2 |
- |
- |
- |
| [Leu1, Dha7]MC-LR |
1023 |
1 |
- |
1 |
- |
| [Leu1]MC-HilR |
1051 |
- |
3 |
- |
- |
| [Leu1]MC-HphR |
1085 |
- |
- |
2 |
- |
| [Leu1]MC-LHar |
1051 |
- |
- |
- |
7 |
| [Leu1]MC-RR |
1080 |
- |
- |
- |
31 |
| [Leu1, Asp3]MC-RR | 1066 | - | - | - | 13 |
Values given as the percentage of relative area of the peaks in the protonated molecular ion chromatograms for the main microcystins variants produced by the studied strain. Hil, homoisoleucine. Hph, homophenylalanine. Har, homoarginine.