Eugenol and methyl eugenol are major constituents of some plant essential oils which are used as active ingredients in the formulation of natural insecticides and insect attractants. Literature is available on their direct application as insecticide and insect attractant but very few literature is available on their formulation. In the present study, solulity of eugenol and methyl eugeol in single and mixed micellar solutions (Cationic/Anionic/Non-ionic surfactants) has been studied and their maximum additive concentration (MAC) has been calculated. Eugenol and methyl eugenol were solublized in different concentration of micellar solutions i.e. Sodium dodecyl sulphate (SDS), Cetyl trimethyl ammonium bromide (CTAB), Triton X-100 and Tween-80 and their different mixtures. It was observed that maximum additive concentration (MAC) of eugenol & methyl eugenol was maximum in SDS and minimum in Triton-X-100 micellar solutions. MAC for eugenol & methyl eugenol was maximum in mole fraction of Tween -80 (SDS + Tween-80) mixed micellar solution and minimum in mole fraction of Triton X-100 (Triton X-100+SDS) mixed micellar solution.The Dynamic light scattering (DLS) result shows that the particle size of water based eugenol and methyl eugenol microemulsion is maximum in Triton-X-100 solution and minimum in CTAB solution. The change in solubilization of these insect attractants and their different particle size may be due to change in size of micellar droplets. The stability of these microemulsions were checked as per standard method and it was found that these formulations are quite stable.
Eugenol, Methyl eugenol, Mixed micelle, Microemulsion, Maximum additive concentration.