caffeine

Caffeine, commonly known as 1,3,7-trimethylxanthine, belongs to the methylxanthine class and gives bitterness to the coffee taste [19].

Caffeine (1,3,7-trimethylxanthine) (C0750), paraxanthine (1,7-dimethylxanthine) (D5385), theobromine (3,7-dimethylxanthine) (T4500, >98%), and 7-([beta]-hydroxyethyl)theophylline (IS) (H9006) were obtained from Sigma (St.

Caffeine (1,3,7-trimethylxanthine (CA)) is an alkaloid component present in natural products such as coca cola, coffee, and tea leaves [6].

Caffeine (1,3,7-trimethylxanthine) is the most widely consumed psychostimulant substance in the world, mainly found in dietary sources, such coffee, tea, and energy drinks [56].

Caffeine (1,3,7-trimethylxanthine) is a natural alkaloid found in coffee beans, tea leaves, cocoa beans, and cola nuts and has become the most commonly used behaviorally-active substance in the world (Giles et al.