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 …

2025年1月4日 · 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 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.

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.

2018年5月14日 · Alkaloids are natural, organic substances that are predominantly found in plants and normally contain at least one nitrogen atom in their chemical structure. Their basic (alkaline) nature has led to the term alkaloids.

Among them, alkaloids demonstrate a broad spectrum of activities. In nature, they not only are produced against herbivores but also reduce bacterial or fungal infestation. Therefore, they are substances that possess high potential in medicine, plant protection, veterinary, or toxicology.

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 structures that contain nitrogen and are derived from plants [27,31]. The nitrogen atoms are present in the ring and attribute alkalinity [27]. The word “alkaloid” was obtained from the Arabic name al-qali, which was coined by the German chemist Carl …

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.

2022年1月1日 · Alkaloids are cyclic compounds containing nitrogen in a negative oxidation state which is of limited distribution in a living organism. The term “alkaloid” marks its origin from the word “alkaline” which in Arabic means “ashes of plants.”