alkaloid

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alkaloid

 [al´kah-loid]
one of a large group of organic, basic substances found in plants. They are usually bitter in taste and are characterized by powerful physiologic activity. Examples are morphine, cocaine, atropine, quinine, nicotine, and caffeine. The term is also applied to synthetic substances that have structures similar to plant alkaloids, such as procaine.
vinca a's see vinca alkaloids.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

al·ka·loid

(al'kă-loyd),
Originally, any one of hundreds of plant and fungal products distinguished by alkaline (basic) reactions, but now restricted to heterocyclic nitrogenous and often complex structures possessing pharmacologic activity; their trivial names usually end in -ine (for example, morphine, atropine, colchicine). Alkaloids are synthesized by plants and are found in the leaf, bark, seed, or other parts, usually constituting the active principle of the crude drug; they are a loosely defined group, but may be classified according to the chemical structure of their main nucleus. For medicinal purposes, due to improved water solubility, the salts of alkaloids (for example, morphine sulfate, codeine phosphate) are usually used. see also individual alkaloid or alkaloid class.
Synonym(s): vegetable base
Farlex Partner Medical Dictionary © Farlex 2012

alkaloid

(ăl′kə-loid′)
n.
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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

alkaloid

Herbal medicine
Any of a number of medicinally active compounds produced by plants; alkaloids are often active in small amounts and toxic in large amounts; well-known alkaloids produced by plants include caffeine, codeine, morphine, nicotine, quinine and strychnine.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

al·ka·loid

(al'kă-loyd)
Originally, any one of hundreds of plant products distinguished by alkaline (basic) reactions, but now restricted to heterocyclic nitrogen-containing and often complex structures possessing pharmacologic activity; their trivial names usually end in -ine (e.g., morphine, atropine, colchicine). Alkaloids are synthesized by plants and are found in the leaf, bark, seed, or other parts, usually constituting the active principle of the crude drug; they are a loosely defined group but may be classified according to the chemical structure of their main nucleus. For medicinal purposes, due to improved water solubility, the salts of alkaloids are typically used.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

Alkaloid

A type of chemical commonly found in plants and often having medicinal properties.
Mentioned in: Chemotherapy
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.

al·ka·loid

(al'kă-loyd)
Heterocyclic nitrogenous and often complex structures possessing pharmacologic activity; synthesized by plants and are found in the leaf, bark, seed, or other parts, usually constituting the active principle of the crude drug; they comprise a loosely defined group.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
The alkaloidal profile of G gracilis naturally growing in Alankiyi/Bayindir differs from the other samples collected from Kemalpasa/Izmir and Yilanlidag/Mugla (Bozkurt-Sarikaya et al.
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.
Spontaneous pneumomediastinum following inhalation of alkaloidal cocaine and emesis: case report and review.
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.
Coordination of photosynthetic and alkaloidal responses to damage in uninducible and inducible Nicotiana sylvestris.
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.