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alkaloid    音标拼音: ['ælkəl,ɔɪd]
n. 生物碱,植物碱基

生物硷,植物硷基

alkaloid
n 1: natural bases containing nitrogen found in plants

Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), Alkaloidal
\Al`ka*loid"al\ ([a^]l`k[.a]*loid"al), a. [Alkali -oid: cf. F.
alcalo["i]de.]
1. Pertaining to, resembling, or containing, alkali.
[1913 Webster]

2. of or pertaining to alkaloids.
[WordNet 1.5]


Alkaloid \Al"ka*loid\ ([a^]l"k[.a]*loid), n. (Chem.)
An organic base, especially one of a class of
nitrogen-containing substances occurring ready formed in the
tissues of plants and the bodies of animals.
[1913 Webster]

Note: Alkaloids all contain nitrogen, carbon, and hydrogen,
and many of them also contain oxygen. They include many
of the active principles in plants; thus, morphine and
narcotine are alkaloids found in opium.
[1913 Webster]


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  • Alkaloid - Wikipedia
    Alkaloids are a broad class of naturally occurring organic compounds that contain at least one nitrogen atom Some synthetic compounds of similar structure may also be termed alkaloids [2] Alkaloids are produced by a large variety of organisms including bacteria, fungi, plants, and animals [3]
  • Alkaloid | Definition, Structure, Classification | Britannica
    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
  • What is Alkaloids? | Health Benefits
    Alkaloids are a diverse group of naturally occurring organic compounds that predominantly contain basic nitrogen atoms These compounds are primarily found in plants and are known for their significant pharmacological effects on humans and animals
  • Alkaloid - an overview | ScienceDirect Topics
    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
  • Characteristics of alkaloids | Britannica
    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
  • Alkaloid - Encyclopedia. com
    alkaloid, any of a class of organic compounds composed of carbon, hydrogen, nitrogen, and usually oxygen that are often derived from plants Although the name means alkalilike, some alkaloids do not exhibit alkaline properties
  • Alkaloid - New World Encyclopedia
    Alkaloids are usually derivatives of amino acids, and many have a bitter taste They are found as secondary metabolites in plants (such as potatoes and tomatoes), animals (such as shellfish), and fungi In many cases, they can be purified from crude extracts by acid-base extraction
  • Alkaloids: Definition, Classification, Properties, and Tests for . . .
    Alkaloids are a diverse group of naturally occurring organic compounds that primarily contain basic nitrogen atoms They are typically derived from plant sources but can also be found in animals, fungi, and bacteria Alkaloids often exhibit significant pharmacological activities, making them valuable in medicine and toxicology
  • Alkaloid | definition of alkaloid by Medical . . . - Medical Dictionary
    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
  • ALKALOID Definition Meaning - Merriam-Webster
    The meaning of ALKALOID is any of numerous usually colorless, complex, and bitter organic bases (such as morphine or caffeine) containing nitrogen and usually oxygen that occur especially in seed plants and are typically physiologically active





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