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Alkaloids are a class of basic, naturally occurring organic compounds that contain at least one nitrogen atom. This group also includes some related compounds with neutral [2] and even weakly acidic properties. [3] . Some synthetic compounds of similar structure may also be termed alkaloids. [4] .
Alkaloid, any of a class of naturally occurring organic nitrogen-containing bases. Alkaloids have diverse and important physiological effects on humans and other animals. Well-known alkaloids include morphine, strychnine, quinine, ephedrine, and nicotine.
Alkaloids are a huge group of naturally occurring organic compounds which contain nitrogen atom or atoms (amino or amido in some cases) in their structures. These nitrogen atoms cause alkalinity of these compounds. These nitrogen atoms are usually situated in some ring (cyclic) system.
Alkaloids are secondary metabolites originally defined as pharmacologically active compounds, primarily composed of nitrogen (Croteau et al., 2000; Ziegler & Facchini, 2008). They are synthesized from one of the few common amino acids: lysine, tyrosine and tryptophan.
Alkaloids provided unique lead compounds for medicine. They have basic properties, in which they are water soluble under acidic conditions and lipid soluble under neural and basic conditions. This is especially important for dissolution in protonated form and membrane permeation in deprotonated form.
Alkaloids are low-molecular-weight nitrogen-containing compounds and, due to the presence of a heterocyclic ring containing a nitrogen atom, are typically alkaline. Alkaloids are known by their numerous pharmacological effects on vertebrates.
alkaloid, Basic (see base) organic compounds of plant origin, containing combined nitrogen. Alkaloids are amines, so their names usually end in “ine” (e.g., caffeine, nicotine, morphine, quinine). Most have complex chemical structures of multiple ring systems.
Alkaloids are nitrogen-containing natural products found in bacteria, fungi, animals, and plants with complex and diverse structures. The widespread distribution of alkaloids along with their...
Alkaloids are amino acid–derived basic nitrogen-containing organic compounds, mainly restricted to the plant kingdom. In plants, alkaloids are synthesized and accumulated as noxious molecules in response to environmental modulations and biotic and abiotic stresses.
Alkaloids are a group of naturally occurring chemical constituents that can be generated by bacteria, fungi, plants, animals and isolated from crude extracts of these organisms.