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

Figure 4

Box plot showing the distribution of the concentrations of the most representative methylxanthine in each group: (a) coffee powder-caffeine, (b) energy drink-caffeine, and (c) chocolate milk-theobromine.

(a)

(b)

(c)