Furthermore, olive oil, DL-a-tocopherol and wheat germ oil
were chosen as oily phase and Tween 20, Cremophor EL and Tween
80 as surfactant were still selected for pseudo-ternary phase diagram
study. In a previous publication a-tocopherol acetate has been
used successfully as oil excipient to formulate a cyclosporine A
microemulsion (Hirunpanich & Sato, 2009). The vitamin E is on
behalf of oil component and has antioxidant properties to increase
curcumin stability