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Any of various organic compounds that are usually basic and contain at least one nitrogen atom in a heterocyclic ring, occurring chiefly in flowering plants. Many alkaloids, such as nicotine, quinine, cocaine, and morphine, are known for their poisonous or medicinal attributes.

al′ka·loi′dal (-loid′l) adj.


relating to alkaloids
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Adj.1.alkaloidal - pertaining to or consisting of alkaloids
References in periodicals archive ?
The alkaloidal fraction from the roots of Cyclea barbata contain two new bisbenzylisoquinoline alkaloids, namely, (-)-2'-norlimacine and (+)-cycleabarbatine (Guinaudeau et al.
Chemical defense: bestowal of a nuptial alkaloidal garment by a male moth on its mate.
Efficacy of piperine, an alkaloidal constituent from Piper nigrum on erythrocyte antioxidant status in high fat diet and antithyroid drug induced hyperlipidemic rats.
While, the poisonous henbane is well known for its alkaloidal content, the occurrence of non-alkaloidal metabolic constituents is not well explored.
Therefore, the abortifacient activity of the aqueous extract of the plant leaf reported earlier (2) is not due to the alkaloidal content alone, but to some other phytochemicals such as saponins and flavonoids which may act synergistically or additively to produce the desired result.
The anti-ulcerogenic effect of an alkaloidal fraction from Mikania cordata on diclofenac sodium-induced gastrointestinal lesions in rats.
Neurotrophic alkaloidal metabolites from the entomogenous deuteromycete Paecilomyces farinosus.
Elliott provides a brief history of the plant and the discovery of its alkaloidal components and includes a considerable amount of information on alkaloids themselves and the action of alkaloids and amino acids generally.
Alkaloidal components in the poisonous plants, Ipomoea carnea (Convolvulacea).
The enhancement of topical bioavailability of such alkaloidal nutraceuticals has been achieved via recently disclosed Ion-Pair delivery systems.
Mayapple, bloodroot, pokeweed, nightshade and hellebore are other alkaloidal plants.