Definition of Alkaloids

The alkaloids are compounds that belong to the group of bases that are naturally occurring, are organic in nature, and contain a nitrogen atom in them. They have different physiological effects on humans as well as on animals. Examples of alkaloids include morphine, quinine, nicotine, etc. These are extracted from plants mostly those who bear flowers. Some species of animals and fungi also produce alkaloids.


The alkaloids are responsible for protecting the plants from the damages that are caused by insects. Alkaloids in their pure form are colorless, have a bitter taste, are non-volatile, and have a crystalline structure. They have a ringed structure which is composed of one or more atoms of nitrogen.

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