Definition of alkaloid in English:

alkaloid

noun ˈalkəlɔɪdˈælkəˌlɔɪd

Chemistry

Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
〔化〕生物碱
Example sentencesExamples
- The cinchona tree contains more than 20 alkaloids of which quinine and quinidine are the most important.
- This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases.
- CE analysis of plant secondary metabolites such as flavonoids, alkaloids, and phenolic acids is now common.
- Diuretics can be found in terpenes, phenolics and alkaloids.
- Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic.
- Second, the alkaloid is refluxed with acetic anhydride for about five hours.
- At present, the chemical components of this water extract are thought to include only alkaloids, terpenes and pigments.
- Many multicellular trichomes are glandular, developing a terminal gland which may secrete a variety of compounds, such as alkaloids to deter or poison predators.
- Prominent examples are quinolizidine alkaloids, gossypol, glucosinolates, nonproteinogenic amino acids and furanocoumarins.
- The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid, since morphine is a phenolic amine.
- Terpenoid indole alkaloids absorb UV radiation and are implicated as having a UV-protective role in plants.
- Morphine is an alkaloid, meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt.
- They are precursors of benzoic phenanthridine alkaloids, active ingredients of many medicinal plant extracts.
- Key alkaloids present in goldenseal include berberine, hydrastine, and canadine.
- Other important alkaloids are caffeine, ricinine, and quinine.
- Berberine is an alkaloid occurring in the plant genera Berberis and Coptis.
- The alkaloids in poppy include morphine, narcotine and codeine - the reasons why opium is used most frequently as a sedative.
- Plant or vinca alkaloids are derived from plants and block cell division during mitosis.
- Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings.
- Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids.

Origin

Early 19th century: coined in German from alkali.

Definition of alkaloid in US English:

alkaloid

nounˈælkəˌlɔɪdˈalkəˌloid

Chemistry

Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
〔化〕生物碱
Example sentencesExamples
- This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases.
- Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings.
- Morphine is an alkaloid, meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt.
- CE analysis of plant secondary metabolites such as flavonoids, alkaloids, and phenolic acids is now common.
- At present, the chemical components of this water extract are thought to include only alkaloids, terpenes and pigments.
- The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid, since morphine is a phenolic amine.
- Second, the alkaloid is refluxed with acetic anhydride for about five hours.
- Prominent examples are quinolizidine alkaloids, gossypol, glucosinolates, nonproteinogenic amino acids and furanocoumarins.
- Many multicellular trichomes are glandular, developing a terminal gland which may secrete a variety of compounds, such as alkaloids to deter or poison predators.
- They are precursors of benzoic phenanthridine alkaloids, active ingredients of many medicinal plant extracts.
- Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids.
- Other important alkaloids are caffeine, ricinine, and quinine.
- The alkaloids in poppy include morphine, narcotine and codeine - the reasons why opium is used most frequently as a sedative.
- Berberine is an alkaloid occurring in the plant genera Berberis and Coptis.
- The cinchona tree contains more than 20 alkaloids of which quinine and quinidine are the most important.
- Key alkaloids present in goldenseal include berberine, hydrastine, and canadine.
- Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic.
- Diuretics can be found in terpenes, phenolics and alkaloids.
- Terpenoid indole alkaloids absorb UV radiation and are implicated as having a UV-protective role in plants.
- Plant or vinca alkaloids are derived from plants and block cell division during mitosis.

Origin

Early 19th century: coined in German from alkali.

单词	alkaloid
释义	Definition of alkaloid in English: alkaloid noun ˈalkəlɔɪdˈælkəˌlɔɪd Chemistry Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine). 〔化〕生物碱 Example sentencesExamples The cinchona tree contains more than 20 alkaloids of which quinine and quinidine are the most important. This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases. CE analysis of plant secondary metabolites such as flavonoids, alkaloids, and phenolic acids is now common. Diuretics can be found in terpenes, phenolics and alkaloids. Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic. Second, the alkaloid is refluxed with acetic anhydride for about five hours. At present, the chemical components of this water extract are thought to include only alkaloids, terpenes and pigments. Many multicellular trichomes are glandular, developing a terminal gland which may secrete a variety of compounds, such as alkaloids to deter or poison predators. Prominent examples are quinolizidine alkaloids, gossypol, glucosinolates, nonproteinogenic amino acids and furanocoumarins. The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid, since morphine is a phenolic amine. Terpenoid indole alkaloids absorb UV radiation and are implicated as having a UV-protective role in plants. Morphine is an alkaloid, meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt. They are precursors of benzoic phenanthridine alkaloids, active ingredients of many medicinal plant extracts. Key alkaloids present in goldenseal include berberine, hydrastine, and canadine. Other important alkaloids are caffeine, ricinine, and quinine. Berberine is an alkaloid occurring in the plant genera Berberis and Coptis. The alkaloids in poppy include morphine, narcotine and codeine - the reasons why opium is used most frequently as a sedative. Plant or vinca alkaloids are derived from plants and block cell division during mitosis. Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings. Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids. Origin Early 19th century: coined in German from alkali. Definition of alkaloid in US English: alkaloid nounˈælkəˌlɔɪdˈalkəˌloid Chemistry Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine). 〔化〕生物碱 Example sentencesExamples This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases. Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings. Morphine is an alkaloid, meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt. CE analysis of plant secondary metabolites such as flavonoids, alkaloids, and phenolic acids is now common. At present, the chemical components of this water extract are thought to include only alkaloids, terpenes and pigments. The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid, since morphine is a phenolic amine. Second, the alkaloid is refluxed with acetic anhydride for about five hours. Prominent examples are quinolizidine alkaloids, gossypol, glucosinolates, nonproteinogenic amino acids and furanocoumarins. Many multicellular trichomes are glandular, developing a terminal gland which may secrete a variety of compounds, such as alkaloids to deter or poison predators. They are precursors of benzoic phenanthridine alkaloids, active ingredients of many medicinal plant extracts. Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids. Other important alkaloids are caffeine, ricinine, and quinine. The alkaloids in poppy include morphine, narcotine and codeine - the reasons why opium is used most frequently as a sedative. Berberine is an alkaloid occurring in the plant genera Berberis and Coptis. The cinchona tree contains more than 20 alkaloids of which quinine and quinidine are the most important. Key alkaloids present in goldenseal include berberine, hydrastine, and canadine. Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic. Diuretics can be found in terpenes, phenolics and alkaloids. Terpenoid indole alkaloids absorb UV radiation and are implicated as having a UV-protective role in plants. Plant or vinca alkaloids are derived from plants and block cell division during mitosis. Origin Early 19th century: coined in German from alkali.
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