Phytochemical Investigations of Nerium Oleander L. Leaves and Flowers
Keywords:
Phytochemicals, oleander, natural products, phenolic, antioxidant, DPPHAbstract
According to the qualitative phytochemical screening of oleander leaves and flowers done, both oleander leaves, and flowers contained phenols, tannins, flavonoids, coumarins, sterols, triterpenes, alkaloids and phlobatannins. Dried semi-powdered oleander leaves, and flowers were extracted with petroleum ether, chloroform, ethyl acetate, acetone, methanol, and water. The total phenolic content and flavonoid content of each extract was determined using ultra-violet/visible spectrophotometer. The alcoholic and aqueous extracts of oleander leaves and flowers contained the highest amount of phenolic compounds. The alcoholic extracts of oleander leaves and flowers contained the highest amount of flavonoids. The antioxidant power of each extract was also determined by measuring the radical scavenging activity towards 1,1-diphenyl-2-picrylhydrazyl (DPPH). The highest antioxidant power was of oleander flowers? alcoholic extract
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