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Alkaloids, , Definition, , Alkaloids are basic heterocyclic, nitrogenous compounds of plant, origin that are physiologically, active.

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Modified Definition:, , Alkaloids are cyclic organic, compounds containing nitrogen in a, negative state of oxidation with limited, distribution among living organisms.

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Classification:, , * True (Typical) alkaloids that are derived from, amino acids and have nitrogen ina, heterocyclic ring. e.g Atropine, , * Protoalkaloids that are derived from amino, acids and do not have nitrogen in a, heterocyclic ring. e.g Ephedrine, , * Pseudo alkaloids that are not derived from, amino acids but have nitrogen ina, heterocyclic ring. e.g Caffeine

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Distribution in Plant:, , , , All Parts e.g. Datura., Barks e.g. Cinchona, Seeds e.g. Nux vomica, Roots e.g. Aconite, Fruits e.g. Black pepper, Leaves e.g. Tobacco, Latex e.g. Opium