2.2. Plant material
C. lentillifera was imported through Marine Global Ltd.(Okinawa, Japan), which was farmed in the Phillippines. The algae was extensively washed with tap water, and dried at room temperature for 1 h after removal of the holdfasts and epiphytes. The dried C. lentillifera was extracted with ethanol for five times. Ethanol extract of C. lentillifera was then filtered, and evaporated under vacuum. The yield from the fresh dried sample was 2%.