Releasing caffeine - how cola can be more active than coffee

(Info from Merck Index)

    The presence of the other alkaloids in colas and tea may explain why
    these sometimes have a stronger kick than coffee. Colas, which have
    lower caffeine contents than coffee are, reportedly, sometimes more
    active. Tea seems the strongest for some. Coffee seems more lasting
    for mental alertness and offers fewer jitters than the others.

 8. How much theobromine/theophylline there is in ...?

    Sources: Physicians Desk Reference and Institute of Food Technologies
    from Pafai and Jankiewicz (1991) DRUGS AND HUMAN BEHAVIOUR

    cocoa                      250mg theobromine
    bittersweet choc. bar      130mg theobromine
    5 oz cup brewed coffee     no theobromine
    tea 5oz cup brewed 3min
    with teabag                3-4 mg theophylline
    Diet Coke                  no theobromine or theophylline


4. Frappe - cold coffee

    Frappe coffee is widely consumed in parts of Europe and LatinAmerica
    especially in summer. Originally was made with cold espresso. Nowadays
    is prepared in most places by shaking into a shaker 1-2 teaspoons of
    instant coffee with sugar, water and ice-cubes and it is served in a
    long glass with ice, milk to taste and a straw. The important thing is
    the thick froth on top of the glass.