Organic nitrogenous bases. Many alkaloids of medical importance occur in the animal and vegetable kingdoms, and some have been synthesized. (Grant & Hackh's Chemical Dictionary, 5th ed)
A group of basic organic compounds, containing nitrogen and often oxygen, occurring in fungi. Many are poisons and others provide sources for beneficial drugs.
Organic compounds produced by plants. These substances constitute the active ingredients of many drugs, e.g. nicotine, morphine, quinine, caffeine.
Nitrogen- containing organic compounds of natural origin that act as bases in solution; examples are nicotine, quinine, morphine, and lysergic acid.
colourless, bitter and often toxic organic bases found in seed plants as a defense against herbivores and insects.
A class of over 3,000 nitrogen-containing chemicals (such as caffeine and cocaine) that are produced by plants but have effects in humans and animals.
Alkaloids occur naturally in nature. They are nitrogen-containing compounds that are alkaline when in solution. We taste them as "bitter." They exert a physiological presence. Nicotine and caffeine are alkaloids.
Nitrogen containing compounds produced mainly by plants. Some (codeine, morphine, and quinine) are used for medical purposes; others (nicotine, and solanine in potatoes exposed to light) are poisonous.
a group of compounds, often found in plants, that have important physiological effects. Compounds include caffeine and morphine.
Naturally occurring, nitrogen-containing compounds that are alkaline in solution. They usually have a bitter taste and are characterised by powerful physiological activity. Examples are nicotine and caffeine.
Compounds containing nitrogen such as codeine, morphine, quinine, nicotine
A diverse group of secondary metabolites, which contain a nitrogen-bearing molecule. They are often poisonous and are widely used in medicine and other fields. A well-known drug produced from alkaloids is vincristine from the Madagascar Periwinkle (Catharanthus roseus). Atropine from deadly nightshade (Atropa belladonna) is used as a pain reliever amongst other things. Their function in the plant is not well understood.
