ABSTRACT
Natural products are secondary metabolites which are derived from herb or animal sources. Separation of a single molecular entity is very difficult from complex mixtures containing fats, oils, alkaloids, tannins, and glycosides. According to World Health Organization, a medicinal plant is any plant of which is one or more of its organs contain substances that can be used for therapeutic purposes or which are precursors for chemo-pharmaceutical semi synthesis. Steroidal glycosides are also referred to as "cardiac glycosides" and are one of the most naturally occurring plant phyto-constituents that have found therapeutic applications as arrow poisons or cardiac drugs. Most alkaloids are readily soluble in alcohol though they are sparingly soluble in water. Flavonoids are an important group of polyphenols widely distributed among the plant flora. Terpenes are among the most widespread and chemically diverse groups of natural products.
