(1) Caffeine is a bitter alkaloid found especially in coffee, tea, and kola nuts and used medicinally as a stimulant and diuretic.(2) Second, the alkaloid is refluxed with acetic anhydride for about five hours.(3) Morphine is an alkaloid , meaning that it is an organic compound that contains carbon, hydrogen and nitrogen, and forms a water-soluble salt.(4) Berberine is an alkaloid occurring in the plant genera Berberis and Coptis.(5) The isolation of morphine from opium takes advantage of the amphoteric nature of the alkaloid , since morphine is a phenolic amine.(6) Barbiturates are derived from barbituric acid, an alkaloid with nitrogen-containing rings.(7) Prominent examples are quinolizidine alkaloids , gossypol, glucosinolates, nonproteinogenic amino acids and furanocoumarins.(8) Terpenoid indole alkaloids absorb UV radiation and are implicated as having a UV-protective role in plants.(9) They are precursors of benzoic phenanthridine alkaloids , active ingredients of many medicinal plant extracts.(10) Diuretics can be found in terpenes, phenolics and alkaloids .(11) Key alkaloids present in goldenseal include berberine, hydrastine, and canadine.(12) Plant or vinca alkaloids are derived from plants and block cell division during mitosis.(13) The alkaloids in poppy include morphine, narcotine and codeine - the reasons why opium is used most frequently as a sedative.(14) Caffeine is a naturally occurring drug belonging to a group of compounds called alkaloids .(15) At present, the chemical components of this water extract are thought to include only alkaloids , terpenes and pigments.(16) This material is a complex mixture of about 20 different alkaloids or nitrogen containing organic bases.
