Recovery of natural insecticides fromTephrosia vogelii.

Distribution of rotenone and deguelin in Tephrosia vogelii and separation of rotenoid-rich fractions

“…Oven drying the chopped fresh plant at 120°C for extended periods reduced the recovery of rotenoids (Table III). Barnes and Freyre (1966) have reported larger losses when dried samples were reheated. This result indicates that evaporation of moisture from the fresh plant may slow the temperature rise within the plant material and hence afford some protection to the rotenoids.…”