An improved process for the preparation of high yielding technical dry amorphous, oil-free powder containing 10 to 17 azadirachtin.

摘要

An improved process for the preparation of high yielding technical dry amorphous oil-free powder containing 10-17% azadiractin from Azadirachta indica seed kernel, which comprises grinding seed kernels of "Azadirachta indica to fine powder, defatting the obtained powder using non-polar solvent, extracting the marc thus obtained by polar solvent, filtering and concentrating the filtrate by conventional methods, incorporating of molecular sieves of the kind as defined herein to the concentrate filtrate, cooling at a temperature ranging from 0° to 10° C for a period of 8-12 hours, precipitating the said filtrate by adding non-polar solvent, filtering and drying the precipitate to obtain powder with yield ranging between 1.1 -1.7% by weight of seed kernels, the process is characterized in using simple steps and molecular sieves of mesh size ranging from 4A° to 5A°. Reference has been made to patent application no. AU-9215646,661482, DE-4109473, 59206503 Es, US - 5695763, EP - 579624.