methylxanthine การใช้

• All five tested positive for banned stimulant methylxanthine.
• I even avoid the methylxanthine stimulants, a cup of coffee keeps me awake all night.
• Coffee, for instance, may aggravate an ulcer but help prevent an asthma attack because its active ingredient, methylxanthine, dilates the bronchial tubes.
• The systematic name of this enzyme class is "'S-adenosyl-L-methionine : 7-methylxanthine N3-methyltransferase " '.
• The psychoactive alkaloid in chocolate that is best known and most distinctive is theobromine, a methylxanthine similar to caffeine, but which may share some receptor affinity with tetrahydrocannabinol.
• Caffeine, known chemically as 1, 3, 7-trimethylxanthine, is one of a class of methylxanthine compounds found in 63 plant products, including tea leaves, cocoa beans and coffee beans.
• Because of theophylline's relation to caffeine ( both being a methylxanthine, and theophylline being a metabolite of caffeine ), caffeine's metabolism and clearance may also be reduced, but there are no drug interaction studies between zileuton and caffeine.
• The differing perceptions in the effects of ingesting beverages made from various plants containing caffeine could be explained by the fact that these beverages also contain varying mixtures of other methylxanthine alkaloids, including the cardiac stimulants theophylline and theobromine, and polyphenols that can form insoluble complexes with caffeine.
• The Jamaican team suffered a number of setbacks before the event : five of the selected athletes ( Yohan Blake, Allodin Fothergill, Lansford Spence, Marvin Anderson and Sheri-Ann Brooks ) tested positive for the stimulant methylxanthine, although it is unclear whether they will be banned from competition.