Abstract
Abstract This paper provides a brief review of studies conducted in our laboratory on the analytical chemistry, environmental behaviour and biological effects of azadirachtin‐A, a neem‐based pesticide. Azadirachtin‐A (AZ‐A) was isolated from samples of neem seed kernels, leaves, bark, root and stem, obtained from Kanthayapalayam, South India. The extracts were subjected to column cleanup and AZ‐A concentration was quantified by using a high‐performance liquid chromatographic (HPLC) method. A flow diagram is given describing the procedures involved. AZ‐A was also isolated from four commercial formulations and from several forestry substrates, and its concentration in each sample was quantified by HPLC. To investigate the environmental behaviour of AZ‐A, five studies were conducted: (i) persistence of AZ‐A on balsam fir and red oak foliage, (ii) dissipation of AZ‐A in forest nursery soils, (iii) leaching in sandy loam forest soil, (iv) adsorption and desorption of AZ‐A in sandy loam soil, and (v) rate of hy...
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