Background of the Study Kaatoan-bangkal is a medium-sized to large tree growing 15 to 45 meters high. Bark is gray, smooth in young trees, rough and longitudinally fissured in old trees. Bole is straight and cylindrical, branchless for up to 25 meters, with small buttresses and a broad crown. Leaves are large, 15 to 50 centimeters long and 8 to 25 centimeters wide, glossy green, opposite, ovate to elliptic, with acute to acuminate apex, loosely arranged, petioled with lanceolate stipules. Flowers are occur in terminal, solitary heads, 3 to 5 centimeters wide. Corolla is funnelform with five lobes. Fruits are united and embedded in a receptacle. (http://stuartxchange.com/Kaatoan-bangkal.html) The Kaatoan-bangkal bark yields Tannins, also called Tannic Acid, which is a polyphenol that has insecticidal properties. Tannins react with the proteins in the animals’ digestive system, denaturing (tanning) them and thus either killing the animal or encouraging it try eating some other plant. Because of this, the researchers wanted to test if the leaves of the Kaatoan Bangkal also yield tannins or other chemicals that has potential insecticidal properties.
Statement of the Problem Main Problem:
Does the Kaatoan Bangkal leaves extract contain chemicals that have insecticidal properties?
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Significance of the Study When proven effective, the phytochemical analysis of Kaatoan Bangkal leaves extract would be helpful:
To the community. The study would help the people widen their knowledge about the Kaatoan Bangkal and its usefulness. It can also help make new products that are cheaper and eco-friendly.
Scope and Limitation of the Study The study will be tested using phytochemical analysis. Only the Kaatoan Bangkal leaves extract will be used in the phytochemical analysis. No other extract from any other plant will be used. The study will be conducted in the span of a year.
