from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An insecticide of complex structure extracted from the seeds of the neem tree
from the GNU version of the Collaborative International Dictionary of English
- n. a triterpenoid (C35H44O16) isolated from the seeds of the neem tree (Azadirachta indica), used as an insecticide.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. insecticide
Sorry, no etymologies found.
Some insecticides that are relatively non-toxic to bees include natural products such as azadirachtin, which is derived from neem oil; Bacillus thuringiensis (B.t.), which controls caterpillars; and pyrethrum and rotenone, both of which are derived from plants.
· homogenous quality (do not vary much from batch to batch) · higher concentration of azadirachtin, which is required to control certain pests
In a pilot plant a powder containing 15% azadirachtin has been gained from the cake.
In a further extraction step it can be used to gain azadirachtin.
Considering the solubility of the leading component azadirachtin, it is clear that only polar solvents should be used for extraction.
The products contain between 0.3 and 1% azadirachtin A as well as many teranortriterpenoides and other substances (residual fat, sugar etc.).
After depulping, the seeds have to be washed in water, dried for 4 - 5 hours in the sun and then moved to the shade, if the sun is strong enough to risk lowering the azadirachtin content of the kernels.
Still, the cold pressed neem oil could contain up to 0.6% azadirachtin A. Water and alcohol are the best solvents.
After recovery of the solvents a powder extract remains with an azadirachtin content of up to 20%.
A higher moisture content will lead to fungal contamination and subsequently to a reduced azadirachtin content.