Stability of azadirachtins A, B and H in water has been studied at varying pH, temperature and electrical conductivity. The rate of degradation of azadirachtins at different pH correlated significantly with temperature. Azadirachtin H was the most stable followed by 8 and A. Maximum stability of all the three azadirachtins was observed in pH range of 4.7–7.0. Synthetic and natural stabilizers promoted maximum hydrostability of azadirachtin A, followed by B and H. Azadirachtins A and H showed maximum to5 of 1.03 and 42.00 d, respectively, at electrical conductance of 16 m mhos cm−1 and B 17.91 d at 12 m mhos cm’. High hardness of waters is apparently conducive to the stability.
Neem, azadirachtin A, Bnd dH hydro-stability, pH, temperature, aqueous stability, electrical conductivity
