Table 1 Physicochemical properties of compounds 1–3 isolated from cultivation of strain LGMF1215.
(+)-Cercosporin (1) | (+)-Isocercosporin (2) | Compound 3 | |
|---|---|---|---|
Molecular Formula | C29H26O10 | C29H26O10 | C14H24O4 |
Appearance | Red solid, UV absorbing (254 nm) | Red solid, UV absorbing (254 nm) | Colorless oil, UV absorbing (254 nm) |
2n NaOH | Dark-green | Dark-green | |
HPLC-Rt a) | 21.45 (min) | 21.85 (min) | 18.19 (min) |
(+)-APCI-MS: m/z | 535 [M + H]+ | 535 [M + H]+ | 257 [M + H]+ |
(+)-HRESI-MS: m/z | |||
Found | 535.1598 [M + H]+ | 535.1599 [M + H]+ | 257.1748 [M + H]+ |
Calcd. | 535.1599 for C29H27O10 [M + H]+ | 535.1599 for C29H27O10 [M + H]+ | 257.1747 for C14H25O4 [M + H]+ |
(−)-HRESI-MS: m/z | |||
Found | 533.1441 [M‒H]− | 533.1444 [M‒H]− | 255.1596 [M‒H]−, 291.1361 [M + Cl]− |
Calcd. | 533.1453 for C29H25O10 [M‒H]− | 533.1453 for C29H25O10 [M‒H]− | 255.1601 for C14H23O4 [M‒H]− 291.1368 for C14H24ClO4 [M + Cl]− |
UV/Vis λmax | 220, 270, 450, 470 (sh), 570 (sh) nm | 220, 270, 450, 470 (sh), 570 (sh) nm | 250 nm |
