| Autor: |
Babu JV; AgResearch Ltd., Ruakura Research Centre , Private Bag 3123 , Hamilton 3240 , New Zealand., Popay AJ; AgResearch Ltd., Ruakura Research Centre , Private Bag 3123 , Hamilton 3240 , New Zealand., Miles CO; AgResearch Ltd., Ruakura Research Centre , Private Bag 3123 , Hamilton 3240 , New Zealand.; National Research Council Canada , 1411 Oxford Street , Halifax , NS B3H 3ZI , Canada., Wilkins AL; Chemistry Department , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand., di Menna ME; AgResearch Ltd., Ruakura Research Centre , Private Bag 3123 , Hamilton 3240 , New Zealand., Finch SC; AgResearch Ltd., Ruakura Research Centre , Private Bag 3123 , Hamilton 3240 , New Zealand. |
| Abstrakt: |
New compounds, 11,12-epoxyjanthitrem B (1) and 11,12-epoxyjanthitrem C (4), were isolated from Penicillium janthinellum and given the trivial names janthitrem A and janthitrem D, respectively. The known compounds janthitrem B (2) and janthitrem C (3) were also isolated, and NMR assignments were made for all four compounds. This showed that the previously published NMR assignments for 3 needed considerable revision. 1 and 2 were used as model compounds for the more complex, and highly unstable, epoxyjanthitrems that have been isolated from perennial ryegrass infected with the AR37 endophyte and which contain an epoxide group analogous to that of 1. Both 1 and 2 induced tremors in mice and reduced weight gain and food consumption of porina ( Wiseana cervinata) larvae, although 1 showed greater potency. This shows the importance of the epoxy group and suggests that epoxyjanthitrems are likely to be involved in the observed effects of the AR37 endophyte on livestock and insects. |
