Solubility Study of Azadirachta indica A. Juss. (Neem) Seed Oil in the Presence of Cosolvent/Nonionic Surfactant at (298.15, 303.15, 308.15, and 313.15) K

Solubility data of Azadirachta indica A. Juss. (neem) seed oil (NSO) in aqueous mixtures of methanol or polysorbate-80 obtained from UV spectral measurements are reported at (298.15, 303.15, 308.15, and 313.15) K. Increased solubility of NSO was observed with an increasing amount of methanol in water at all temperatures. However, for the polysorbate-80 + water system, the increase in solubility was significant only at lower concentrations, i.e., up to 0.1 mass %, but at higher concentrations of polysorbate-80, the increase in NSO solubility was not significant.