(noun) a crystalline compound related in structure to uric acid and found in urine, blood, certain plants, and certain animal tissues. Formula: C5H4N4O2
(noun) any substituted derivative of xanthine, esp one of the three pharmacologically active methylated xanthines, caffeine, theophylline, or theobromine, which act as stimulants and diuretics
Use "xanthines" in a sentence
"A decade later, Cornell scientist Harry Gold no relation to Old was trying to figure out whether or not xanthines, a group of stimulants that included caffeine, really deserved their reputation as a remedy for angina."
"For physiology the experimental proof that uric acid and the xanthines originate from one and the same parent form is of the greatest importance as it has provided the strongest support for the modern theory of the formation of uric acid from the nucleoproteins of the cell nucleus and from the purines contained therein."
"Every piece of animal flesh is saturated with these excrements of the cells in the form of uric acid and many other kinds of acids, alkaloids of putrefaction, xanthines, ptomaines, etc. The organism of the meat eater must dispose not only of its own impurities produced in the processes of digestion and of cell metabolism, but also of the morbid substances that are already contained in the animal flesh."