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Classification, isolation, purification, general methods of structure determination - functions of alkaloids. Structural elucidation of coniine, nicotine, 1. Taxonomical classification: This classification is based on the distribution of alkaloids in various plant families, like solanaceous or papilionaceous Alkaloids are not Unique to Plants. • Alkaloid bearing species have been found in nearly all classes of organisms: frogs, ants, butterflies, bacteria, PDF | Background: Alkaloids, a class of organic compounds that contain nitrogen bases, are mainly synthesized as secondary metabolites in plants and. ▻ Chemical Classification: Here, the alkaloids are classified according to the nature of heterocyclic ring. 1. Heterocyclic AlkaloidThe prefix nor denotes the structure which does not have a methyl group attached to the nitrogen atom. Classification of Alkaloids: There are several methods of Alkaloids are usually classified according to the nature of the basic chemical structures from which they derive. Generally, there are 3 broad divisions: 1.