Determination of Caffeine, Theobromine, and Theophylline by HPLC-DAD in Beverages Commonly Consumed in Lima, Peru

Figure 5

Box plot showing the distribution of the concentrations of methylxanthines: (a) theobromine (mg/L), (b) theophylline (mg/L), and (c) caffeine (mg/100 g sample).

(a)

(b)

(c)